Merge pull request #13841 from lsm5/main-cve-2022-27191

Bump golang.org/x/crypto to 7b82a4e

28 files changed, 568 insertions, 3839 deletions

diff --git a/vendor/golang.org/x/crypto/chacha20/chacha_s390x.go b/vendor/golang.org/x/crypto/chacha20/chacha_s390x.go
index c5898db46..4652247b8 100644
--- a/vendor/golang.org/x/crypto/chacha20/chacha_s390x.go
+++ b/vendor/golang.org/x/crypto/chacha20/chacha_s390x.go
@@ -15,6 +15,7 @@ const bufSize = 256
 
 // xorKeyStreamVX is an assembly implementation of XORKeyStream. It must only
 // be called when the vector facility is available. Implementation in asm_s390x.s.
+//
 //go:noescape
 func xorKeyStreamVX(dst, src []byte, key *[8]uint32, nonce *[3]uint32, counter *uint32)
 
diff --git a/vendor/golang.org/x/crypto/curve25519/internal/field/fe_amd64.go b/vendor/golang.org/x/crypto/curve25519/internal/field/fe_amd64.go
index 44dc8e8ca..edcf163c4 100644
--- a/vendor/golang.org/x/crypto/curve25519/internal/field/fe_amd64.go
+++ b/vendor/golang.org/x/crypto/curve25519/internal/field/fe_amd64.go
@@ -1,13 +1,16 @@
 // Code generated by command: go run fe_amd64_asm.go -out ../fe_amd64.s -stubs ../fe_amd64.go -pkg field. DO NOT EDIT.
 
+//go:build amd64 && gc && !purego
 // +build amd64,gc,!purego
 
 package field
 
 // feMul sets out = a * b. It works like feMulGeneric.
+//
 //go:noescape
 func feMul(out *Element, a *Element, b *Element)
 
 // feSquare sets out = a * a. It works like feSquareGeneric.
+//
 //go:noescape
 func feSquare(out *Element, a *Element)
diff --git a/vendor/golang.org/x/crypto/ed25519/ed25519.go b/vendor/golang.org/x/crypto/ed25519/ed25519.go
index 71ad917da..a7828345f 100644
--- a/vendor/golang.org/x/crypto/ed25519/ed25519.go
+++ b/vendor/golang.org/x/crypto/ed25519/ed25519.go
@@ -1,13 +1,7 @@
-// Copyright 2016 The Go Authors. All rights reserved.
+// Copyright 2019 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// In Go 1.13, the ed25519 package was promoted to the standard library as
-// crypto/ed25519, and this package became a wrapper for the standard library one.
-//
-//go:build !go1.13
-// +build !go1.13
-
 // Package ed25519 implements the Ed25519 signature algorithm. See
 // https://ed25519.cr.yp.to/.
 //
@@ -16,21 +10,15 @@
 // representation includes a public key suffix to make multiple signing
 // operations with the same key more efficient. This package refers to the RFC
 // 8032 private key as the “seed”.
+//
+// Beginning with Go 1.13, the functionality of this package was moved to the
+// standard library as crypto/ed25519. This package only acts as a compatibility
+// wrapper.
 package ed25519
 
-// This code is a port of the public domain, “ref10” implementation of ed25519
-// from SUPERCOP.
-
 import (
-	"bytes"
-	"crypto"
-	cryptorand "crypto/rand"
-	"crypto/sha512"
-	"errors"
+	"crypto/ed25519"
 	"io"
-	"strconv"
-
-	"golang.org/x/crypto/ed25519/internal/edwards25519"
 )
 
 const (
@@ -45,57 +33,21 @@ const (
 )
 
 // PublicKey is the type of Ed25519 public keys.
-type PublicKey []byte
+//
+// This type is an alias for crypto/ed25519's PublicKey type.
+// See the crypto/ed25519 package for the methods on this type.
+type PublicKey = ed25519.PublicKey
 
 // PrivateKey is the type of Ed25519 private keys. It implements crypto.Signer.
-type PrivateKey []byte
-
-// Public returns the PublicKey corresponding to priv.
-func (priv PrivateKey) Public() crypto.PublicKey {
-	publicKey := make([]byte, PublicKeySize)
-	copy(publicKey, priv[32:])
-	return PublicKey(publicKey)
-}
-
-// Seed returns the private key seed corresponding to priv. It is provided for
-// interoperability with RFC 8032. RFC 8032's private keys correspond to seeds
-// in this package.
-func (priv PrivateKey) Seed() []byte {
-	seed := make([]byte, SeedSize)
-	copy(seed, priv[:32])
-	return seed
-}
-
-// Sign signs the given message with priv.
-// Ed25519 performs two passes over messages to be signed and therefore cannot
-// handle pre-hashed messages. Thus opts.HashFunc() must return zero to
-// indicate the message hasn't been hashed. This can be achieved by passing
-// crypto.Hash(0) as the value for opts.
-func (priv PrivateKey) Sign(rand io.Reader, message []byte, opts crypto.SignerOpts) (signature []byte, err error) {
-	if opts.HashFunc() != crypto.Hash(0) {
-		return nil, errors.New("ed25519: cannot sign hashed message")
-	}
-
-	return Sign(priv, message), nil
-}
+//
+// This type is an alias for crypto/ed25519's PrivateKey type.
+// See the crypto/ed25519 package for the methods on this type.
+type PrivateKey = ed25519.PrivateKey
 
 // GenerateKey generates a public/private key pair using entropy from rand.
 // If rand is nil, crypto/rand.Reader will be used.
 func GenerateKey(rand io.Reader) (PublicKey, PrivateKey, error) {
-	if rand == nil {
-		rand = cryptorand.Reader
-	}
-
-	seed := make([]byte, SeedSize)
-	if _, err := io.ReadFull(rand, seed); err != nil {
-		return nil, nil, err
-	}
-
-	privateKey := NewKeyFromSeed(seed)
-	publicKey := make([]byte, PublicKeySize)
-	copy(publicKey, privateKey[32:])
-
-	return publicKey, privateKey, nil
+	return ed25519.GenerateKey(rand)
 }
 
 // NewKeyFromSeed calculates a private key from a seed. It will panic if
@@ -103,121 +55,17 @@ func GenerateKey(rand io.Reader) (PublicKey, PrivateKey, error) {
 // with RFC 8032. RFC 8032's private keys correspond to seeds in this
 // package.
 func NewKeyFromSeed(seed []byte) PrivateKey {
-	if l := len(seed); l != SeedSize {
-		panic("ed25519: bad seed length: " + strconv.Itoa(l))
-	}
-
-	digest := sha512.Sum512(seed)
-	digest[0] &= 248
-	digest[31] &= 127
-	digest[31] |= 64
-
-	var A edwards25519.ExtendedGroupElement
-	var hBytes [32]byte
-	copy(hBytes[:], digest[:])
-	edwards25519.GeScalarMultBase(&A, &hBytes)
-	var publicKeyBytes [32]byte
-	A.ToBytes(&publicKeyBytes)
-
-	privateKey := make([]byte, PrivateKeySize)
-	copy(privateKey, seed)
-	copy(privateKey[32:], publicKeyBytes[:])
-
-	return privateKey
+	return ed25519.NewKeyFromSeed(seed)
 }
 
 // Sign signs the message with privateKey and returns a signature. It will
 // panic if len(privateKey) is not PrivateKeySize.
 func Sign(privateKey PrivateKey, message []byte) []byte {
-	if l := len(privateKey); l != PrivateKeySize {
-		panic("ed25519: bad private key length: " + strconv.Itoa(l))
-	}
-
-	h := sha512.New()
-	h.Write(privateKey[:32])
-
-	var digest1, messageDigest, hramDigest [64]byte
-	var expandedSecretKey [32]byte
-	h.Sum(digest1[:0])
-	copy(expandedSecretKey[:], digest1[:])
-	expandedSecretKey[0] &= 248
-	expandedSecretKey[31] &= 63
-	expandedSecretKey[31] |= 64
-
-	h.Reset()
-	h.Write(digest1[32:])
-	h.Write(message)
-	h.Sum(messageDigest[:0])
-
-	var messageDigestReduced [32]byte
-	edwards25519.ScReduce(&messageDigestReduced, &messageDigest)
-	var R edwards25519.ExtendedGroupElement
-	edwards25519.GeScalarMultBase(&R, &messageDigestReduced)
-
-	var encodedR [32]byte
-	R.ToBytes(&encodedR)
-
-	h.Reset()
-	h.Write(encodedR[:])
-	h.Write(privateKey[32:])
-	h.Write(message)
-	h.Sum(hramDigest[:0])
-	var hramDigestReduced [32]byte
-	edwards25519.ScReduce(&hramDigestReduced, &hramDigest)
-
-	var s [32]byte
-	edwards25519.ScMulAdd(&s, &hramDigestReduced, &expandedSecretKey, &messageDigestReduced)
-
-	signature := make([]byte, SignatureSize)
-	copy(signature[:], encodedR[:])
-	copy(signature[32:], s[:])
-
-	return signature
+	return ed25519.Sign(privateKey, message)
 }
 
 // Verify reports whether sig is a valid signature of message by publicKey. It
 // will panic if len(publicKey) is not PublicKeySize.
 func Verify(publicKey PublicKey, message, sig []byte) bool {
-	if l := len(publicKey); l != PublicKeySize {
-		panic("ed25519: bad public key length: " + strconv.Itoa(l))
-	}
-
-	if len(sig) != SignatureSize || sig[63]&224 != 0 {
-		return false
-	}
-
-	var A edwards25519.ExtendedGroupElement
-	var publicKeyBytes [32]byte
-	copy(publicKeyBytes[:], publicKey)
-	if !A.FromBytes(&publicKeyBytes) {
-		return false
-	}
-	edwards25519.FeNeg(&A.X, &A.X)
-	edwards25519.FeNeg(&A.T, &A.T)
-
-	h := sha512.New()
-	h.Write(sig[:32])
-	h.Write(publicKey[:])
-	h.Write(message)
-	var digest [64]byte
-	h.Sum(digest[:0])
-
-	var hReduced [32]byte
-	edwards25519.ScReduce(&hReduced, &digest)
-
-	var R edwards25519.ProjectiveGroupElement
-	var s [32]byte
-	copy(s[:], sig[32:])
-
-	// https://tools.ietf.org/html/rfc8032#section-5.1.7 requires that s be in
-	// the range [0, order) in order to prevent signature malleability.
-	if !edwards25519.ScMinimal(&s) {
-		return false
-	}
-
-	edwards25519.GeDoubleScalarMultVartime(&R, &hReduced, &A, &s)
-
-	var checkR [32]byte
-	R.ToBytes(&checkR)
-	return bytes.Equal(sig[:32], checkR[:])
+	return ed25519.Verify(publicKey, message, sig)
 }
diff --git a/vendor/golang.org/x/crypto/ed25519/ed25519_go113.go b/vendor/golang.org/x/crypto/ed25519/ed25519_go113.go
deleted file mode 100644
index b5974dc8b..000000000
--- a/vendor/golang.org/x/crypto/ed25519/ed25519_go113.go
+++ /dev/null
@@ -1,74 +0,0 @@
-// Copyright 2019 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-//go:build go1.13
-// +build go1.13
-
-// Package ed25519 implements the Ed25519 signature algorithm. See
-// https://ed25519.cr.yp.to/.
-//
-// These functions are also compatible with the “Ed25519” function defined in
-// RFC 8032. However, unlike RFC 8032's formulation, this package's private key
-// representation includes a public key suffix to make multiple signing
-// operations with the same key more efficient. This package refers to the RFC
-// 8032 private key as the “seed”.
-//
-// Beginning with Go 1.13, the functionality of this package was moved to the
-// standard library as crypto/ed25519. This package only acts as a compatibility
-// wrapper.
-package ed25519
-
-import (
-	"crypto/ed25519"
-	"io"
-)
-
-const (
-	// PublicKeySize is the size, in bytes, of public keys as used in this package.
-	PublicKeySize = 32
-	// PrivateKeySize is the size, in bytes, of private keys as used in this package.
-	PrivateKeySize = 64
-	// SignatureSize is the size, in bytes, of signatures generated and verified by this package.
-	SignatureSize = 64
-	// SeedSize is the size, in bytes, of private key seeds. These are the private key representations used by RFC 8032.
-	SeedSize = 32
-)
-
-// PublicKey is the type of Ed25519 public keys.
-//
-// This type is an alias for crypto/ed25519's PublicKey type.
-// See the crypto/ed25519 package for the methods on this type.
-type PublicKey = ed25519.PublicKey
-
-// PrivateKey is the type of Ed25519 private keys. It implements crypto.Signer.
-//
-// This type is an alias for crypto/ed25519's PrivateKey type.
-// See the crypto/ed25519 package for the methods on this type.
-type PrivateKey = ed25519.PrivateKey
-
-// GenerateKey generates a public/private key pair using entropy from rand.
-// If rand is nil, crypto/rand.Reader will be used.
-func GenerateKey(rand io.Reader) (PublicKey, PrivateKey, error) {
-	return ed25519.GenerateKey(rand)
-}
-
-// NewKeyFromSeed calculates a private key from a seed. It will panic if
-// len(seed) is not SeedSize. This function is provided for interoperability
-// with RFC 8032. RFC 8032's private keys correspond to seeds in this
-// package.
-func NewKeyFromSeed(seed []byte) PrivateKey {
-	return ed25519.NewKeyFromSeed(seed)
-}
-
-// Sign signs the message with privateKey and returns a signature. It will
-// panic if len(privateKey) is not PrivateKeySize.
-func Sign(privateKey PrivateKey, message []byte) []byte {
-	return ed25519.Sign(privateKey, message)
-}
-
-// Verify reports whether sig is a valid signature of message by publicKey. It
-// will panic if len(publicKey) is not PublicKeySize.
-func Verify(publicKey PublicKey, message, sig []byte) bool {
-	return ed25519.Verify(publicKey, message, sig)
-}
diff --git a/vendor/golang.org/x/crypto/ed25519/internal/edwards25519/const.go b/vendor/golang.org/x/crypto/ed25519/internal/edwards25519/const.go
deleted file mode 100644
index e39f086c1..000000000
--- a/vendor/golang.org/x/crypto/ed25519/internal/edwards25519/const.go
+++ /dev/null
@@ -1,1422 +0,0 @@
-// Copyright 2016 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package edwards25519
-
-// These values are from the public domain, “ref10” implementation of ed25519
-// from SUPERCOP.
-
-// d is a constant in the Edwards curve equation.
-var d = FieldElement{
-	-10913610, 13857413, -15372611, 6949391, 114729, -8787816, -6275908, -3247719, -18696448, -12055116,
-}
-
-// d2 is 2*d.
-var d2 = FieldElement{
-	-21827239, -5839606, -30745221, 13898782, 229458, 15978800, -12551817, -6495438, 29715968, 9444199,
-}
-
-// SqrtM1 is the square-root of -1 in the field.
-var SqrtM1 = FieldElement{
-	-32595792, -7943725, 9377950, 3500415, 12389472, -272473, -25146209, -2005654, 326686, 11406482,
-}
-
-// A is a constant in the Montgomery-form of curve25519.
-var A = FieldElement{
-	486662, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-}
-
-// bi contains precomputed multiples of the base-point. See the Ed25519 paper
-// for a discussion about how these values are used.
-var bi = [8]PreComputedGroupElement{
-	{
-		FieldElement{25967493, -14356035, 29566456, 3660896, -12694345, 4014787, 27544626, -11754271, -6079156, 2047605},
-		FieldElement{-12545711, 934262, -2722910, 3049990, -727428, 9406986, 12720692, 5043384, 19500929, -15469378},
-		FieldElement{-8738181, 4489570, 9688441, -14785194, 10184609, -12363380, 29287919, 11864899, -24514362, -4438546},
-	},
-	{
-		FieldElement{15636291, -9688557, 24204773, -7912398, 616977, -16685262, 27787600, -14772189, 28944400, -1550024},
-		FieldElement{16568933, 4717097, -11556148, -1102322, 15682896, -11807043, 16354577, -11775962, 7689662, 11199574},
-		FieldElement{30464156, -5976125, -11779434, -15670865, 23220365, 15915852, 7512774, 10017326, -17749093, -9920357},
-	},
-	{
-		FieldElement{10861363, 11473154, 27284546, 1981175, -30064349, 12577861, 32867885, 14515107, -15438304, 10819380},
-		FieldElement{4708026, 6336745, 20377586, 9066809, -11272109, 6594696, -25653668, 12483688, -12668491, 5581306},
-		FieldElement{19563160, 16186464, -29386857, 4097519, 10237984, -4348115, 28542350, 13850243, -23678021, -15815942},
-	},
-	{
-		FieldElement{5153746, 9909285, 1723747, -2777874, 30523605, 5516873, 19480852, 5230134, -23952439, -15175766},
-		FieldElement{-30269007, -3463509, 7665486, 10083793, 28475525, 1649722, 20654025, 16520125, 30598449, 7715701},
-		FieldElement{28881845, 14381568, 9657904, 3680757, -20181635, 7843316, -31400660, 1370708, 29794553, -1409300},
-	},
-	{
-		FieldElement{-22518993, -6692182, 14201702, -8745502, -23510406, 8844726, 18474211, -1361450, -13062696, 13821877},
-		FieldElement{-6455177, -7839871, 3374702, -4740862, -27098617, -10571707, 31655028, -7212327, 18853322, -14220951},
-		FieldElement{4566830, -12963868, -28974889, -12240689, -7602672, -2830569, -8514358, -10431137, 2207753, -3209784},
-	},
-	{
-		FieldElement{-25154831, -4185821, 29681144, 7868801, -6854661, -9423865, -12437364, -663000, -31111463, -16132436},
-		FieldElement{25576264, -2703214, 7349804, -11814844, 16472782, 9300885, 3844789, 15725684, 171356, 6466918},
-		FieldElement{23103977, 13316479, 9739013, -16149481, 817875, -15038942, 8965339, -14088058, -30714912, 16193877},
-	},
-	{
-		FieldElement{-33521811, 3180713, -2394130, 14003687, -16903474, -16270840, 17238398, 4729455, -18074513, 9256800},
-		FieldElement{-25182317, -4174131, 32336398, 5036987, -21236817, 11360617, 22616405, 9761698, -19827198, 630305},
-		FieldElement{-13720693, 2639453, -24237460, -7406481, 9494427, -5774029, -6554551, -15960994, -2449256, -14291300},
-	},
-	{
-		FieldElement{-3151181, -5046075, 9282714, 6866145, -31907062, -863023, -18940575, 15033784, 25105118, -7894876},
-		FieldElement{-24326370, 15950226, -31801215, -14592823, -11662737, -5090925, 1573892, -2625887, 2198790, -15804619},
-		FieldElement{-3099351, 10324967, -2241613, 7453183, -5446979, -2735503, -13812022, -16236442, -32461234, -12290683},
-	},
-}
-
-// base contains precomputed multiples of the base-point. See the Ed25519 paper
-// for a discussion about how these values are used.
-var base = [32][8]PreComputedGroupElement{
-	{
-		{
-			FieldElement{25967493, -14356035, 29566456, 3660896, -12694345, 4014787, 27544626, -11754271, -6079156, 2047605},
-			FieldElement{-12545711, 934262, -2722910, 3049990, -727428, 9406986, 12720692, 5043384, 19500929, -15469378},
-			FieldElement{-8738181, 4489570, 9688441, -14785194, 10184609, -12363380, 29287919, 11864899, -24514362, -4438546},
-		},
-		{
-			FieldElement{-12815894, -12976347, -21581243, 11784320, -25355658, -2750717, -11717903, -3814571, -358445, -10211303},
-			FieldElement{-21703237, 6903825, 27185491, 6451973, -29577724, -9554005, -15616551, 11189268, -26829678, -5319081},
-			FieldElement{26966642, 11152617, 32442495, 15396054, 14353839, -12752335, -3128826, -9541118, -15472047, -4166697},
-		},
-		{
-			FieldElement{15636291, -9688557, 24204773, -7912398, 616977, -16685262, 27787600, -14772189, 28944400, -1550024},
-			FieldElement{16568933, 4717097, -11556148, -1102322, 15682896, -11807043, 16354577, -11775962, 7689662, 11199574},
-			FieldElement{30464156, -5976125, -11779434, -15670865, 23220365, 15915852, 7512774, 10017326, -17749093, -9920357},
-		},
-		{
-			FieldElement{-17036878, 13921892, 10945806, -6033431, 27105052, -16084379, -28926210, 15006023, 3284568, -6276540},
-			FieldElement{23599295, -8306047, -11193664, -7687416, 13236774, 10506355, 7464579, 9656445, 13059162, 10374397},
-			FieldElement{7798556, 16710257, 3033922, 2874086, 28997861, 2835604, 32406664, -3839045, -641708, -101325},
-		},
-		{
-			FieldElement{10861363, 11473154, 27284546, 1981175, -30064349, 12577861, 32867885, 14515107, -15438304, 10819380},
-			FieldElement{4708026, 6336745, 20377586, 9066809, -11272109, 6594696, -25653668, 12483688, -12668491, 5581306},
-			FieldElement{19563160, 16186464, -29386857, 4097519, 10237984, -4348115, 28542350, 13850243, -23678021, -15815942},
-		},
-		{
-			FieldElement{-15371964, -12862754, 32573250, 4720197, -26436522, 5875511, -19188627, -15224819, -9818940, -12085777},
-			FieldElement{-8549212, 109983, 15149363, 2178705, 22900618, 4543417, 3044240, -15689887, 1762328, 14866737},
-			FieldElement{-18199695, -15951423, -10473290, 1707278, -17185920, 3916101, -28236412, 3959421, 27914454, 4383652},
-		},
-		{
-			FieldElement{5153746, 9909285, 1723747, -2777874, 30523605, 5516873, 19480852, 5230134, -23952439, -15175766},
-			FieldElement{-30269007, -3463509, 7665486, 10083793, 28475525, 1649722, 20654025, 16520125, 30598449, 7715701},
-			FieldElement{28881845, 14381568, 9657904, 3680757, -20181635, 7843316, -31400660, 1370708, 29794553, -1409300},
-		},
-		{
-			FieldElement{14499471, -2729599, -33191113, -4254652, 28494862, 14271267, 30290735, 10876454, -33154098, 2381726},
-			FieldElement{-7195431, -2655363, -14730155, 462251, -27724326, 3941372, -6236617, 3696005, -32300832, 15351955},
-			FieldElement{27431194, 8222322, 16448760, -3907995, -18707002, 11938355, -32961401, -2970515, 29551813, 10109425},
-		},
-	},
-	{
-		{
-			FieldElement{-13657040, -13155431, -31283750, 11777098, 21447386, 6519384, -2378284, -1627556, 10092783, -4764171},
-			FieldElement{27939166, 14210322, 4677035, 16277044, -22964462, -12398139, -32508754, 12005538, -17810127, 12803510},
-			FieldElement{17228999, -15661624, -1233527, 300140, -1224870, -11714777, 30364213, -9038194, 18016357, 4397660},
-		},
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-			FieldElement{30098053, 3089662, -9234387, 16662135, -21306940, 11308411, -14068454, 12021730, 9955285, -16303356},
-			FieldElement{9734894, -14576830, -7473633, -9138735, 2060392, 11313496, -18426029, 9924399, 20194861, 13380996},
-			FieldElement{-26378102, -7965207, -22167821, 15789297, -18055342, -6168792, -1984914, 15707771, 26342023, 10146099},
-		},
-	},
-	{
-		{
-			FieldElement{-26016874, -219943, 21339191, -41388, 19745256, -2878700, -29637280, 2227040, 21612326, -545728},
-			FieldElement{-13077387, 1184228, 23562814, -5970442, -20351244, -6348714, 25764461, 12243797, -20856566, 11649658},
-			FieldElement{-10031494, 11262626, 27384172, 2271902, 26947504, -15997771, 39944, 6114064, 33514190, 2333242},
-		},
-		{
-			FieldElement{-21433588, -12421821, 8119782, 7219913, -21830522, -9016134, -6679750, -12670638, 24350578, -13450001},
-			FieldElement{-4116307, -11271533, -23886186, 4843615, -30088339, 690623, -31536088, -10406836, 8317860, 12352766},
-			FieldElement{18200138, -14475911, -33087759, -2696619, -23702521, -9102511, -23552096, -2287550, 20712163, 6719373},
-		},
-		{
-			FieldElement{26656208, 6075253, -7858556, 1886072, -28344043, 4262326, 11117530, -3763210, 26224235, -3297458},
-			FieldElement{-17168938, -14854097, -3395676, -16369877, -19954045, 14050420, 21728352, 9493610, 18620611, -16428628},
-			FieldElement{-13323321, 13325349, 11432106, 5964811, 18609221, 6062965, -5269471, -9725556, -30701573, -16479657},
-		},
-		{
-			FieldElement{-23860538, -11233159, 26961357, 1640861, -32413112, -16737940, 12248509, -5240639, 13735342, 1934062},
-			FieldElement{25089769, 6742589, 17081145, -13406266, 21909293, -16067981, -15136294, -3765346, -21277997, 5473616},
-			FieldElement{31883677, -7961101, 1083432, -11572403, 22828471, 13290673, -7125085, 12469656, 29111212, -5451014},
-		},
-		{
-			FieldElement{24244947, -15050407, -26262976, 2791540, -14997599, 16666678, 24367466, 6388839, -10295587, 452383},
-			FieldElement{-25640782, -3417841, 5217916, 16224624, 19987036, -4082269, -24236251, -5915248, 15766062, 8407814},
-			FieldElement{-20406999, 13990231, 15495425, 16395525, 5377168, 15166495, -8917023, -4388953, -8067909, 2276718},
-		},
-		{
-			FieldElement{30157918, 12924066, -17712050, 9245753, 19895028, 3368142, -23827587, 5096219, 22740376, -7303417},
-			FieldElement{2041139, -14256350, 7783687, 13876377, -25946985, -13352459, 24051124, 13742383, -15637599, 13295222},
-			FieldElement{33338237, -8505733, 12532113, 7977527, 9106186, -1715251, -17720195, -4612972, -4451357, -14669444},
-		},
-		{
-			FieldElement{-20045281, 5454097, -14346548, 6447146, 28862071, 1883651, -2469266, -4141880, 7770569, 9620597},
-			FieldElement{23208068, 7979712, 33071466, 8149229, 1758231, -10834995, 30945528, -1694323, -33502340, -14767970},
-			FieldElement{1439958, -16270480, -1079989, -793782, 4625402, 10647766, -5043801, 1220118, 30494170, -11440799},
-		},
-		{
-			FieldElement{-5037580, -13028295, -2970559, -3061767, 15640974, -6701666, -26739026, 926050, -1684339, -13333647},
-			FieldElement{13908495, -3549272, 30919928, -6273825, -21521863, 7989039, 9021034, 9078865, 3353509, 4033511},
-			FieldElement{-29663431, -15113610, 32259991, -344482, 24295849, -12912123, 23161163, 8839127, 27485041, 7356032},
-		},
-	},
-	{
-		{
-			FieldElement{9661027, 705443, 11980065, -5370154, -1628543, 14661173, -6346142, 2625015, 28431036, -16771834},
-			FieldElement{-23839233, -8311415, -25945511, 7480958, -17681669, -8354183, -22545972, 14150565, 15970762, 4099461},
-			FieldElement{29262576, 16756590, 26350592, -8793563, 8529671, -11208050, 13617293, -9937143, 11465739, 8317062},
-		},
-		{
-			FieldElement{-25493081, -6962928, 32500200, -9419051, -23038724, -2302222, 14898637, 3848455, 20969334, -5157516},
-			FieldElement{-20384450, -14347713, -18336405, 13884722, -33039454, 2842114, -21610826, -3649888, 11177095, 14989547},
-			FieldElement{-24496721, -11716016, 16959896, 2278463, 12066309, 10137771, 13515641, 2581286, -28487508, 9930240},
-		},
-		{
-			FieldElement{-17751622, -2097826, 16544300, -13009300, -15914807, -14949081, 18345767, -13403753, 16291481, -5314038},
-			FieldElement{-33229194, 2553288, 32678213, 9875984, 8534129, 6889387, -9676774, 6957617, 4368891, 9788741},
-			FieldElement{16660756, 7281060, -10830758, 12911820, 20108584, -8101676, -21722536, -8613148, 16250552, -11111103},
-		},
-		{
-			FieldElement{-19765507, 2390526, -16551031, 14161980, 1905286, 6414907, 4689584, 10604807, -30190403, 4782747},
-			FieldElement{-1354539, 14736941, -7367442, -13292886, 7710542, -14155590, -9981571, 4383045, 22546403, 437323},
-			FieldElement{31665577, -12180464, -16186830, 1491339, -18368625, 3294682, 27343084, 2786261, -30633590, -14097016},
-		},
-		{
-			FieldElement{-14467279, -683715, -33374107, 7448552, 19294360, 14334329, -19690631, 2355319, -19284671, -6114373},
-			FieldElement{15121312, -15796162, 6377020, -6031361, -10798111, -12957845, 18952177, 15496498, -29380133, 11754228},
-			FieldElement{-2637277, -13483075, 8488727, -14303896, 12728761, -1622493, 7141596, 11724556, 22761615, -10134141},
-		},
-		{
-			FieldElement{16918416, 11729663, -18083579, 3022987, -31015732, -13339659, -28741185, -12227393, 32851222, 11717399},
-			FieldElement{11166634, 7338049, -6722523, 4531520, -29468672, -7302055, 31474879, 3483633, -1193175, -4030831},
-			FieldElement{-185635, 9921305, 31456609, -13536438, -12013818, 13348923, 33142652, 6546660, -19985279, -3948376},
-		},
-		{
-			FieldElement{-32460596, 11266712, -11197107, -7899103, 31703694, 3855903, -8537131, -12833048, -30772034, -15486313},
-			FieldElement{-18006477, 12709068, 3991746, -6479188, -21491523, -10550425, -31135347, -16049879, 10928917, 3011958},
-			FieldElement{-6957757, -15594337, 31696059, 334240, 29576716, 14796075, -30831056, -12805180, 18008031, 10258577},
-		},
-		{
-			FieldElement{-22448644, 15655569, 7018479, -4410003, -30314266, -1201591, -1853465, 1367120, 25127874, 6671743},
-			FieldElement{29701166, -14373934, -10878120, 9279288, -17568, 13127210, 21382910, 11042292, 25838796, 4642684},
-			FieldElement{-20430234, 14955537, -24126347, 8124619, -5369288, -5990470, 30468147, -13900640, 18423289, 4177476},
-		},
-	},
-}
diff --git a/vendor/golang.org/x/crypto/ed25519/internal/edwards25519/edwards25519.go b/vendor/golang.org/x/crypto/ed25519/internal/edwards25519/edwards25519.go
deleted file mode 100644
index fd03c252a..000000000
--- a/vendor/golang.org/x/crypto/ed25519/internal/edwards25519/edwards25519.go
+++ /dev/null
@@ -1,1793 +0,0 @@
-// Copyright 2016 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package edwards25519
-
-import "encoding/binary"
-
-// This code is a port of the public domain, “ref10” implementation of ed25519
-// from SUPERCOP.
-
-// FieldElement represents an element of the field GF(2^255 - 19).  An element
-// t, entries t[0]...t[9], represents the integer t[0]+2^26 t[1]+2^51 t[2]+2^77
-// t[3]+2^102 t[4]+...+2^230 t[9].  Bounds on each t[i] vary depending on
-// context.
-type FieldElement [10]int32
-
-var zero FieldElement
-
-func FeZero(fe *FieldElement) {
-	copy(fe[:], zero[:])
-}
-
-func FeOne(fe *FieldElement) {
-	FeZero(fe)
-	fe[0] = 1
-}
-
-func FeAdd(dst, a, b *FieldElement) {
-	dst[0] = a[0] + b[0]
-	dst[1] = a[1] + b[1]
-	dst[2] = a[2] + b[2]
-	dst[3] = a[3] + b[3]
-	dst[4] = a[4] + b[4]
-	dst[5] = a[5] + b[5]
-	dst[6] = a[6] + b[6]
-	dst[7] = a[7] + b[7]
-	dst[8] = a[8] + b[8]
-	dst[9] = a[9] + b[9]
-}
-
-func FeSub(dst, a, b *FieldElement) {
-	dst[0] = a[0] - b[0]
-	dst[1] = a[1] - b[1]
-	dst[2] = a[2] - b[2]
-	dst[3] = a[3] - b[3]
-	dst[4] = a[4] - b[4]
-	dst[5] = a[5] - b[5]
-	dst[6] = a[6] - b[6]
-	dst[7] = a[7] - b[7]
-	dst[8] = a[8] - b[8]
-	dst[9] = a[9] - b[9]
-}
-
-func FeCopy(dst, src *FieldElement) {
-	copy(dst[:], src[:])
-}
-
-// Replace (f,g) with (g,g) if b == 1;
-// replace (f,g) with (f,g) if b == 0.
-//
-// Preconditions: b in {0,1}.
-func FeCMove(f, g *FieldElement, b int32) {
-	b = -b
-	f[0] ^= b & (f[0] ^ g[0])
-	f[1] ^= b & (f[1] ^ g[1])
-	f[2] ^= b & (f[2] ^ g[2])
-	f[3] ^= b & (f[3] ^ g[3])
-	f[4] ^= b & (f[4] ^ g[4])
-	f[5] ^= b & (f[5] ^ g[5])
-	f[6] ^= b & (f[6] ^ g[6])
-	f[7] ^= b & (f[7] ^ g[7])
-	f[8] ^= b & (f[8] ^ g[8])
-	f[9] ^= b & (f[9] ^ g[9])
-}
-
-func load3(in []byte) int64 {
-	var r int64
-	r = int64(in[0])
-	r |= int64(in[1]) << 8
-	r |= int64(in[2]) << 16
-	return r
-}
-
-func load4(in []byte) int64 {
-	var r int64
-	r = int64(in[0])
-	r |= int64(in[1]) << 8
-	r |= int64(in[2]) << 16
-	r |= int64(in[3]) << 24
-	return r
-}
-
-func FeFromBytes(dst *FieldElement, src *[32]byte) {
-	h0 := load4(src[:])
-	h1 := load3(src[4:]) << 6
-	h2 := load3(src[7:]) << 5
-	h3 := load3(src[10:]) << 3
-	h4 := load3(src[13:]) << 2
-	h5 := load4(src[16:])
-	h6 := load3(src[20:]) << 7
-	h7 := load3(src[23:]) << 5
-	h8 := load3(src[26:]) << 4
-	h9 := (load3(src[29:]) & 8388607) << 2
-
-	FeCombine(dst, h0, h1, h2, h3, h4, h5, h6, h7, h8, h9)
-}
-
-// FeToBytes marshals h to s.
-// Preconditions:
-//   |h| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
-//
-// Write p=2^255-19; q=floor(h/p).
-// Basic claim: q = floor(2^(-255)(h + 19 2^(-25)h9 + 2^(-1))).
-//
-// Proof:
-//   Have |h|<=p so |q|<=1 so |19^2 2^(-255) q|<1/4.
-//   Also have |h-2^230 h9|<2^230 so |19 2^(-255)(h-2^230 h9)|<1/4.
-//
-//   Write y=2^(-1)-19^2 2^(-255)q-19 2^(-255)(h-2^230 h9).
-//   Then 0<y<1.
-//
-//   Write r=h-pq.
-//   Have 0<=r<=p-1=2^255-20.
-//   Thus 0<=r+19(2^-255)r<r+19(2^-255)2^255<=2^255-1.
-//
-//   Write x=r+19(2^-255)r+y.
-//   Then 0<x<2^255 so floor(2^(-255)x) = 0 so floor(q+2^(-255)x) = q.
-//
-//   Have q+2^(-255)x = 2^(-255)(h + 19 2^(-25) h9 + 2^(-1))
-//   so floor(2^(-255)(h + 19 2^(-25) h9 + 2^(-1))) = q.
-func FeToBytes(s *[32]byte, h *FieldElement) {
-	var carry [10]int32
-
-	q := (19*h[9] + (1 << 24)) >> 25
-	q = (h[0] + q) >> 26
-	q = (h[1] + q) >> 25
-	q = (h[2] + q) >> 26
-	q = (h[3] + q) >> 25
-	q = (h[4] + q) >> 26
-	q = (h[5] + q) >> 25
-	q = (h[6] + q) >> 26
-	q = (h[7] + q) >> 25
-	q = (h[8] + q) >> 26
-	q = (h[9] + q) >> 25
-
-	// Goal: Output h-(2^255-19)q, which is between 0 and 2^255-20.
-	h[0] += 19 * q
-	// Goal: Output h-2^255 q, which is between 0 and 2^255-20.
-
-	carry[0] = h[0] >> 26
-	h[1] += carry[0]
-	h[0] -= carry[0] << 26
-	carry[1] = h[1] >> 25
-	h[2] += carry[1]
-	h[1] -= carry[1] << 25
-	carry[2] = h[2] >> 26
-	h[3] += carry[2]
-	h[2] -= carry[2] << 26
-	carry[3] = h[3] >> 25
-	h[4] += carry[3]
-	h[3] -= carry[3] << 25
-	carry[4] = h[4] >> 26
-	h[5] += carry[4]
-	h[4] -= carry[4] << 26
-	carry[5] = h[5] >> 25
-	h[6] += carry[5]
-	h[5] -= carry[5] << 25
-	carry[6] = h[6] >> 26
-	h[7] += carry[6]
-	h[6] -= carry[6] << 26
-	carry[7] = h[7] >> 25
-	h[8] += carry[7]
-	h[7] -= carry[7] << 25
-	carry[8] = h[8] >> 26
-	h[9] += carry[8]
-	h[8] -= carry[8] << 26
-	carry[9] = h[9] >> 25
-	h[9] -= carry[9] << 25
-	// h10 = carry9
-
-	// Goal: Output h[0]+...+2^255 h10-2^255 q, which is between 0 and 2^255-20.
-	// Have h[0]+...+2^230 h[9] between 0 and 2^255-1;
-	// evidently 2^255 h10-2^255 q = 0.
-	// Goal: Output h[0]+...+2^230 h[9].
-
-	s[0] = byte(h[0] >> 0)
-	s[1] = byte(h[0] >> 8)
-	s[2] = byte(h[0] >> 16)
-	s[3] = byte((h[0] >> 24) | (h[1] << 2))
-	s[4] = byte(h[1] >> 6)
-	s[5] = byte(h[1] >> 14)
-	s[6] = byte((h[1] >> 22) | (h[2] << 3))
-	s[7] = byte(h[2] >> 5)
-	s[8] = byte(h[2] >> 13)
-	s[9] = byte((h[2] >> 21) | (h[3] << 5))
-	s[10] = byte(h[3] >> 3)
-	s[11] = byte(h[3] >> 11)
-	s[12] = byte((h[3] >> 19) | (h[4] << 6))
-	s[13] = byte(h[4] >> 2)
-	s[14] = byte(h[4] >> 10)
-	s[15] = byte(h[4] >> 18)
-	s[16] = byte(h[5] >> 0)
-	s[17] = byte(h[5] >> 8)
-	s[18] = byte(h[5] >> 16)
-	s[19] = byte((h[5] >> 24) | (h[6] << 1))
-	s[20] = byte(h[6] >> 7)
-	s[21] = byte(h[6] >> 15)
-	s[22] = byte((h[6] >> 23) | (h[7] << 3))
-	s[23] = byte(h[7] >> 5)
-	s[24] = byte(h[7] >> 13)
-	s[25] = byte((h[7] >> 21) | (h[8] << 4))
-	s[26] = byte(h[8] >> 4)
-	s[27] = byte(h[8] >> 12)
-	s[28] = byte((h[8] >> 20) | (h[9] << 6))
-	s[29] = byte(h[9] >> 2)
-	s[30] = byte(h[9] >> 10)
-	s[31] = byte(h[9] >> 18)
-}
-
-func FeIsNegative(f *FieldElement) byte {
-	var s [32]byte
-	FeToBytes(&s, f)
-	return s[0] & 1
-}
-
-func FeIsNonZero(f *FieldElement) int32 {
-	var s [32]byte
-	FeToBytes(&s, f)
-	var x uint8
-	for _, b := range s {
-		x |= b
-	}
-	x |= x >> 4
-	x |= x >> 2
-	x |= x >> 1
-	return int32(x & 1)
-}
-
-// FeNeg sets h = -f
-//
-// Preconditions:
-//    |f| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
-//
-// Postconditions:
-//    |h| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
-func FeNeg(h, f *FieldElement) {
-	h[0] = -f[0]
-	h[1] = -f[1]
-	h[2] = -f[2]
-	h[3] = -f[3]
-	h[4] = -f[4]
-	h[5] = -f[5]
-	h[6] = -f[6]
-	h[7] = -f[7]
-	h[8] = -f[8]
-	h[9] = -f[9]
-}
-
-func FeCombine(h *FieldElement, h0, h1, h2, h3, h4, h5, h6, h7, h8, h9 int64) {
-	var c0, c1, c2, c3, c4, c5, c6, c7, c8, c9 int64
-
-	/*
-	  |h0| <= (1.1*1.1*2^52*(1+19+19+19+19)+1.1*1.1*2^50*(38+38+38+38+38))
-	    i.e. |h0| <= 1.2*2^59; narrower ranges for h2, h4, h6, h8
-	  |h1| <= (1.1*1.1*2^51*(1+1+19+19+19+19+19+19+19+19))
-	    i.e. |h1| <= 1.5*2^58; narrower ranges for h3, h5, h7, h9
-	*/
-
-	c0 = (h0 + (1 << 25)) >> 26
-	h1 += c0
-	h0 -= c0 << 26
-	c4 = (h4 + (1 << 25)) >> 26
-	h5 += c4
-	h4 -= c4 << 26
-	/* |h0| <= 2^25 */
-	/* |h4| <= 2^25 */
-	/* |h1| <= 1.51*2^58 */
-	/* |h5| <= 1.51*2^58 */
-
-	c1 = (h1 + (1 << 24)) >> 25
-	h2 += c1
-	h1 -= c1 << 25
-	c5 = (h5 + (1 << 24)) >> 25
-	h6 += c5
-	h5 -= c5 << 25
-	/* |h1| <= 2^24; from now on fits into int32 */
-	/* |h5| <= 2^24; from now on fits into int32 */
-	/* |h2| <= 1.21*2^59 */
-	/* |h6| <= 1.21*2^59 */
-
-	c2 = (h2 + (1 << 25)) >> 26
-	h3 += c2
-	h2 -= c2 << 26
-	c6 = (h6 + (1 << 25)) >> 26
-	h7 += c6
-	h6 -= c6 << 26
-	/* |h2| <= 2^25; from now on fits into int32 unchanged */
-	/* |h6| <= 2^25; from now on fits into int32 unchanged */
-	/* |h3| <= 1.51*2^58 */
-	/* |h7| <= 1.51*2^58 */
-
-	c3 = (h3 + (1 << 24)) >> 25
-	h4 += c3
-	h3 -= c3 << 25
-	c7 = (h7 + (1 << 24)) >> 25
-	h8 += c7
-	h7 -= c7 << 25
-	/* |h3| <= 2^24; from now on fits into int32 unchanged */
-	/* |h7| <= 2^24; from now on fits into int32 unchanged */
-	/* |h4| <= 1.52*2^33 */
-	/* |h8| <= 1.52*2^33 */
-
-	c4 = (h4 + (1 << 25)) >> 26
-	h5 += c4
-	h4 -= c4 << 26
-	c8 = (h8 + (1 << 25)) >> 26
-	h9 += c8
-	h8 -= c8 << 26
-	/* |h4| <= 2^25; from now on fits into int32 unchanged */
-	/* |h8| <= 2^25; from now on fits into int32 unchanged */
-	/* |h5| <= 1.01*2^24 */
-	/* |h9| <= 1.51*2^58 */
-
-	c9 = (h9 + (1 << 24)) >> 25
-	h0 += c9 * 19
-	h9 -= c9 << 25
-	/* |h9| <= 2^24; from now on fits into int32 unchanged */
-	/* |h0| <= 1.8*2^37 */
-
-	c0 = (h0 + (1 << 25)) >> 26
-	h1 += c0
-	h0 -= c0 << 26
-	/* |h0| <= 2^25; from now on fits into int32 unchanged */
-	/* |h1| <= 1.01*2^24 */
-
-	h[0] = int32(h0)
-	h[1] = int32(h1)
-	h[2] = int32(h2)
-	h[3] = int32(h3)
-	h[4] = int32(h4)
-	h[5] = int32(h5)
-	h[6] = int32(h6)
-	h[7] = int32(h7)
-	h[8] = int32(h8)
-	h[9] = int32(h9)
-}
-
-// FeMul calculates h = f * g
-// Can overlap h with f or g.
-//
-// Preconditions:
-//    |f| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc.
-//    |g| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc.
-//
-// Postconditions:
-//    |h| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
-//
-// Notes on implementation strategy:
-//
-// Using schoolbook multiplication.
-// Karatsuba would save a little in some cost models.
-//
-// Most multiplications by 2 and 19 are 32-bit precomputations;
-// cheaper than 64-bit postcomputations.
-//
-// There is one remaining multiplication by 19 in the carry chain;
-// one *19 precomputation can be merged into this,
-// but the resulting data flow is considerably less clean.
-//
-// There are 12 carries below.
-// 10 of them are 2-way parallelizable and vectorizable.
-// Can get away with 11 carries, but then data flow is much deeper.
-//
-// With tighter constraints on inputs, can squeeze carries into int32.
-func FeMul(h, f, g *FieldElement) {
-	f0 := int64(f[0])
-	f1 := int64(f[1])
-	f2 := int64(f[2])
-	f3 := int64(f[3])
-	f4 := int64(f[4])
-	f5 := int64(f[5])
-	f6 := int64(f[6])
-	f7 := int64(f[7])
-	f8 := int64(f[8])
-	f9 := int64(f[9])
-
-	f1_2 := int64(2 * f[1])
-	f3_2 := int64(2 * f[3])
-	f5_2 := int64(2 * f[5])
-	f7_2 := int64(2 * f[7])
-	f9_2 := int64(2 * f[9])
-
-	g0 := int64(g[0])
-	g1 := int64(g[1])
-	g2 := int64(g[2])
-	g3 := int64(g[3])
-	g4 := int64(g[4])
-	g5 := int64(g[5])
-	g6 := int64(g[6])
-	g7 := int64(g[7])
-	g8 := int64(g[8])
-	g9 := int64(g[9])
-
-	g1_19 := int64(19 * g[1]) /* 1.4*2^29 */
-	g2_19 := int64(19 * g[2]) /* 1.4*2^30; still ok */
-	g3_19 := int64(19 * g[3])
-	g4_19 := int64(19 * g[4])
-	g5_19 := int64(19 * g[5])
-	g6_19 := int64(19 * g[6])
-	g7_19 := int64(19 * g[7])
-	g8_19 := int64(19 * g[8])
-	g9_19 := int64(19 * g[9])
-
-	h0 := f0*g0 + f1_2*g9_19 + f2*g8_19 + f3_2*g7_19 + f4*g6_19 + f5_2*g5_19 + f6*g4_19 + f7_2*g3_19 + f8*g2_19 + f9_2*g1_19
-	h1 := f0*g1 + f1*g0 + f2*g9_19 + f3*g8_19 + f4*g7_19 + f5*g6_19 + f6*g5_19 + f7*g4_19 + f8*g3_19 + f9*g2_19
-	h2 := f0*g2 + f1_2*g1 + f2*g0 + f3_2*g9_19 + f4*g8_19 + f5_2*g7_19 + f6*g6_19 + f7_2*g5_19 + f8*g4_19 + f9_2*g3_19
-	h3 := f0*g3 + f1*g2 + f2*g1 + f3*g0 + f4*g9_19 + f5*g8_19 + f6*g7_19 + f7*g6_19 + f8*g5_19 + f9*g4_19
-	h4 := f0*g4 + f1_2*g3 + f2*g2 + f3_2*g1 + f4*g0 + f5_2*g9_19 + f6*g8_19 + f7_2*g7_19 + f8*g6_19 + f9_2*g5_19
-	h5 := f0*g5 + f1*g4 + f2*g3 + f3*g2 + f4*g1 + f5*g0 + f6*g9_19 + f7*g8_19 + f8*g7_19 + f9*g6_19
-	h6 := f0*g6 + f1_2*g5 + f2*g4 + f3_2*g3 + f4*g2 + f5_2*g1 + f6*g0 + f7_2*g9_19 + f8*g8_19 + f9_2*g7_19
-	h7 := f0*g7 + f1*g6 + f2*g5 + f3*g4 + f4*g3 + f5*g2 + f6*g1 + f7*g0 + f8*g9_19 + f9*g8_19
-	h8 := f0*g8 + f1_2*g7 + f2*g6 + f3_2*g5 + f4*g4 + f5_2*g3 + f6*g2 + f7_2*g1 + f8*g0 + f9_2*g9_19
-	h9 := f0*g9 + f1*g8 + f2*g7 + f3*g6 + f4*g5 + f5*g4 + f6*g3 + f7*g2 + f8*g1 + f9*g0
-
-	FeCombine(h, h0, h1, h2, h3, h4, h5, h6, h7, h8, h9)
-}
-
-func feSquare(f *FieldElement) (h0, h1, h2, h3, h4, h5, h6, h7, h8, h9 int64) {
-	f0 := int64(f[0])
-	f1 := int64(f[1])
-	f2 := int64(f[2])
-	f3 := int64(f[3])
-	f4 := int64(f[4])
-	f5 := int64(f[5])
-	f6 := int64(f[6])
-	f7 := int64(f[7])
-	f8 := int64(f[8])
-	f9 := int64(f[9])
-	f0_2 := int64(2 * f[0])
-	f1_2 := int64(2 * f[1])
-	f2_2 := int64(2 * f[2])
-	f3_2 := int64(2 * f[3])
-	f4_2 := int64(2 * f[4])
-	f5_2 := int64(2 * f[5])
-	f6_2 := int64(2 * f[6])
-	f7_2 := int64(2 * f[7])
-	f5_38 := 38 * f5 // 1.31*2^30
-	f6_19 := 19 * f6 // 1.31*2^30
-	f7_38 := 38 * f7 // 1.31*2^30
-	f8_19 := 19 * f8 // 1.31*2^30
-	f9_38 := 38 * f9 // 1.31*2^30
-
-	h0 = f0*f0 + f1_2*f9_38 + f2_2*f8_19 + f3_2*f7_38 + f4_2*f6_19 + f5*f5_38
-	h1 = f0_2*f1 + f2*f9_38 + f3_2*f8_19 + f4*f7_38 + f5_2*f6_19
-	h2 = f0_2*f2 + f1_2*f1 + f3_2*f9_38 + f4_2*f8_19 + f5_2*f7_38 + f6*f6_19
-	h3 = f0_2*f3 + f1_2*f2 + f4*f9_38 + f5_2*f8_19 + f6*f7_38
-	h4 = f0_2*f4 + f1_2*f3_2 + f2*f2 + f5_2*f9_38 + f6_2*f8_19 + f7*f7_38
-	h5 = f0_2*f5 + f1_2*f4 + f2_2*f3 + f6*f9_38 + f7_2*f8_19
-	h6 = f0_2*f6 + f1_2*f5_2 + f2_2*f4 + f3_2*f3 + f7_2*f9_38 + f8*f8_19
-	h7 = f0_2*f7 + f1_2*f6 + f2_2*f5 + f3_2*f4 + f8*f9_38
-	h8 = f0_2*f8 + f1_2*f7_2 + f2_2*f6 + f3_2*f5_2 + f4*f4 + f9*f9_38
-	h9 = f0_2*f9 + f1_2*f8 + f2_2*f7 + f3_2*f6 + f4_2*f5
-
-	return
-}
-
-// FeSquare calculates h = f*f. Can overlap h with f.
-//
-// Preconditions:
-//    |f| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc.
-//
-// Postconditions:
-//    |h| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
-func FeSquare(h, f *FieldElement) {
-	h0, h1, h2, h3, h4, h5, h6, h7, h8, h9 := feSquare(f)
-	FeCombine(h, h0, h1, h2, h3, h4, h5, h6, h7, h8, h9)
-}
-
-// FeSquare2 sets h = 2 * f * f
-//
-// Can overlap h with f.
-//
-// Preconditions:
-//    |f| bounded by 1.65*2^26,1.65*2^25,1.65*2^26,1.65*2^25,etc.
-//
-// Postconditions:
-//    |h| bounded by 1.01*2^25,1.01*2^24,1.01*2^25,1.01*2^24,etc.
-// See fe_mul.c for discussion of implementation strategy.
-func FeSquare2(h, f *FieldElement) {
-	h0, h1, h2, h3, h4, h5, h6, h7, h8, h9 := feSquare(f)
-
-	h0 += h0
-	h1 += h1
-	h2 += h2
-	h3 += h3
-	h4 += h4
-	h5 += h5
-	h6 += h6
-	h7 += h7
-	h8 += h8
-	h9 += h9
-
-	FeCombine(h, h0, h1, h2, h3, h4, h5, h6, h7, h8, h9)
-}
-
-func FeInvert(out, z *FieldElement) {
-	var t0, t1, t2, t3 FieldElement
-	var i int
-
-	FeSquare(&t0, z)        // 2^1
-	FeSquare(&t1, &t0)      // 2^2
-	for i = 1; i < 2; i++ { // 2^3
-		FeSquare(&t1, &t1)
-	}
-	FeMul(&t1, z, &t1)      // 2^3 + 2^0
-	FeMul(&t0, &t0, &t1)    // 2^3 + 2^1 + 2^0
-	FeSquare(&t2, &t0)      // 2^4 + 2^2 + 2^1
-	FeMul(&t1, &t1, &t2)    // 2^4 + 2^3 + 2^2 + 2^1 + 2^0
-	FeSquare(&t2, &t1)      // 5,4,3,2,1
-	for i = 1; i < 5; i++ { // 9,8,7,6,5
-		FeSquare(&t2, &t2)
-	}
-	FeMul(&t1, &t2, &t1)     // 9,8,7,6,5,4,3,2,1,0
-	FeSquare(&t2, &t1)       // 10..1
-	for i = 1; i < 10; i++ { // 19..10
-		FeSquare(&t2, &t2)
-	}
-	FeMul(&t2, &t2, &t1)     // 19..0
-	FeSquare(&t3, &t2)       // 20..1
-	for i = 1; i < 20; i++ { // 39..20
-		FeSquare(&t3, &t3)
-	}
-	FeMul(&t2, &t3, &t2)     // 39..0
-	FeSquare(&t2, &t2)       // 40..1
-	for i = 1; i < 10; i++ { // 49..10
-		FeSquare(&t2, &t2)
-	}
-	FeMul(&t1, &t2, &t1)     // 49..0
-	FeSquare(&t2, &t1)       // 50..1
-	for i = 1; i < 50; i++ { // 99..50
-		FeSquare(&t2, &t2)
-	}
-	FeMul(&t2, &t2, &t1)      // 99..0
-	FeSquare(&t3, &t2)        // 100..1
-	for i = 1; i < 100; i++ { // 199..100
-		FeSquare(&t3, &t3)
-	}
-	FeMul(&t2, &t3, &t2)     // 199..0
-	FeSquare(&t2, &t2)       // 200..1
-	for i = 1; i < 50; i++ { // 249..50
-		FeSquare(&t2, &t2)
-	}
-	FeMul(&t1, &t2, &t1)    // 249..0
-	FeSquare(&t1, &t1)      // 250..1
-	for i = 1; i < 5; i++ { // 254..5
-		FeSquare(&t1, &t1)
-	}
-	FeMul(out, &t1, &t0) // 254..5,3,1,0
-}
-
-func fePow22523(out, z *FieldElement) {
-	var t0, t1, t2 FieldElement
-	var i int
-
-	FeSquare(&t0, z)
-	for i = 1; i < 1; i++ {
-		FeSquare(&t0, &t0)
-	}
-	FeSquare(&t1, &t0)
-	for i = 1; i < 2; i++ {
-		FeSquare(&t1, &t1)
-	}
-	FeMul(&t1, z, &t1)
-	FeMul(&t0, &t0, &t1)
-	FeSquare(&t0, &t0)
-	for i = 1; i < 1; i++ {
-		FeSquare(&t0, &t0)
-	}
-	FeMul(&t0, &t1, &t0)
-	FeSquare(&t1, &t0)
-	for i = 1; i < 5; i++ {
-		FeSquare(&t1, &t1)
-	}
-	FeMul(&t0, &t1, &t0)
-	FeSquare(&t1, &t0)
-	for i = 1; i < 10; i++ {
-		FeSquare(&t1, &t1)
-	}
-	FeMul(&t1, &t1, &t0)
-	FeSquare(&t2, &t1)
-	for i = 1; i < 20; i++ {
-		FeSquare(&t2, &t2)
-	}
-	FeMul(&t1, &t2, &t1)
-	FeSquare(&t1, &t1)
-	for i = 1; i < 10; i++ {
-		FeSquare(&t1, &t1)
-	}
-	FeMul(&t0, &t1, &t0)
-	FeSquare(&t1, &t0)
-	for i = 1; i < 50; i++ {
-		FeSquare(&t1, &t1)
-	}
-	FeMul(&t1, &t1, &t0)
-	FeSquare(&t2, &t1)
-	for i = 1; i < 100; i++ {
-		FeSquare(&t2, &t2)
-	}
-	FeMul(&t1, &t2, &t1)
-	FeSquare(&t1, &t1)
-	for i = 1; i < 50; i++ {
-		FeSquare(&t1, &t1)
-	}
-	FeMul(&t0, &t1, &t0)
-	FeSquare(&t0, &t0)
-	for i = 1; i < 2; i++ {
-		FeSquare(&t0, &t0)
-	}
-	FeMul(out, &t0, z)
-}
-
-// Group elements are members of the elliptic curve -x^2 + y^2 = 1 + d * x^2 *
-// y^2 where d = -121665/121666.
-//
-// Several representations are used:
-//   ProjectiveGroupElement: (X:Y:Z) satisfying x=X/Z, y=Y/Z
-//   ExtendedGroupElement: (X:Y:Z:T) satisfying x=X/Z, y=Y/Z, XY=ZT
-//   CompletedGroupElement: ((X:Z),(Y:T)) satisfying x=X/Z, y=Y/T
-//   PreComputedGroupElement: (y+x,y-x,2dxy)
-
-type ProjectiveGroupElement struct {
-	X, Y, Z FieldElement
-}
-
-type ExtendedGroupElement struct {
-	X, Y, Z, T FieldElement
-}
-
-type CompletedGroupElement struct {
-	X, Y, Z, T FieldElement
-}
-
-type PreComputedGroupElement struct {
-	yPlusX, yMinusX, xy2d FieldElement
-}
-
-type CachedGroupElement struct {
-	yPlusX, yMinusX, Z, T2d FieldElement
-}
-
-func (p *ProjectiveGroupElement) Zero() {
-	FeZero(&p.X)
-	FeOne(&p.Y)
-	FeOne(&p.Z)
-}
-
-func (p *ProjectiveGroupElement) Double(r *CompletedGroupElement) {
-	var t0 FieldElement
-
-	FeSquare(&r.X, &p.X)
-	FeSquare(&r.Z, &p.Y)
-	FeSquare2(&r.T, &p.Z)
-	FeAdd(&r.Y, &p.X, &p.Y)
-	FeSquare(&t0, &r.Y)
-	FeAdd(&r.Y, &r.Z, &r.X)
-	FeSub(&r.Z, &r.Z, &r.X)
-	FeSub(&r.X, &t0, &r.Y)
-	FeSub(&r.T, &r.T, &r.Z)
-}
-
-func (p *ProjectiveGroupElement) ToBytes(s *[32]byte) {
-	var recip, x, y FieldElement
-
-	FeInvert(&recip, &p.Z)
-	FeMul(&x, &p.X, &recip)
-	FeMul(&y, &p.Y, &recip)
-	FeToBytes(s, &y)
-	s[31] ^= FeIsNegative(&x) << 7
-}
-
-func (p *ExtendedGroupElement) Zero() {
-	FeZero(&p.X)
-	FeOne(&p.Y)
-	FeOne(&p.Z)
-	FeZero(&p.T)
-}
-
-func (p *ExtendedGroupElement) Double(r *CompletedGroupElement) {
-	var q ProjectiveGroupElement
-	p.ToProjective(&q)
-	q.Double(r)
-}
-
-func (p *ExtendedGroupElement) ToCached(r *CachedGroupElement) {
-	FeAdd(&r.yPlusX, &p.Y, &p.X)
-	FeSub(&r.yMinusX, &p.Y, &p.X)
-	FeCopy(&r.Z, &p.Z)
-	FeMul(&r.T2d, &p.T, &d2)
-}
-
-func (p *ExtendedGroupElement) ToProjective(r *ProjectiveGroupElement) {
-	FeCopy(&r.X, &p.X)
-	FeCopy(&r.Y, &p.Y)
-	FeCopy(&r.Z, &p.Z)
-}
-
-func (p *ExtendedGroupElement) ToBytes(s *[32]byte) {
-	var recip, x, y FieldElement
-
-	FeInvert(&recip, &p.Z)
-	FeMul(&x, &p.X, &recip)
-	FeMul(&y, &p.Y, &recip)
-	FeToBytes(s, &y)
-	s[31] ^= FeIsNegative(&x) << 7
-}
-
-func (p *ExtendedGroupElement) FromBytes(s *[32]byte) bool {
-	var u, v, v3, vxx, check FieldElement
-
-	FeFromBytes(&p.Y, s)
-	FeOne(&p.Z)
-	FeSquare(&u, &p.Y)
-	FeMul(&v, &u, &d)
-	FeSub(&u, &u, &p.Z) // y = y^2-1
-	FeAdd(&v, &v, &p.Z) // v = dy^2+1
-
-	FeSquare(&v3, &v)
-	FeMul(&v3, &v3, &v) // v3 = v^3
-	FeSquare(&p.X, &v3)
-	FeMul(&p.X, &p.X, &v)
-	FeMul(&p.X, &p.X, &u) // x = uv^7
-
-	fePow22523(&p.X, &p.X) // x = (uv^7)^((q-5)/8)
-	FeMul(&p.X, &p.X, &v3)
-	FeMul(&p.X, &p.X, &u) // x = uv^3(uv^7)^((q-5)/8)
-
-	var tmpX, tmp2 [32]byte
-
-	FeSquare(&vxx, &p.X)
-	FeMul(&vxx, &vxx, &v)
-	FeSub(&check, &vxx, &u) // vx^2-u
-	if FeIsNonZero(&check) == 1 {
-		FeAdd(&check, &vxx, &u) // vx^2+u
-		if FeIsNonZero(&check) == 1 {
-			return false
-		}
-		FeMul(&p.X, &p.X, &SqrtM1)
-
-		FeToBytes(&tmpX, &p.X)
-		for i, v := range tmpX {
-			tmp2[31-i] = v
-		}
-	}
-
-	if FeIsNegative(&p.X) != (s[31] >> 7) {
-		FeNeg(&p.X, &p.X)
-	}
-
-	FeMul(&p.T, &p.X, &p.Y)
-	return true
-}
-
-func (p *CompletedGroupElement) ToProjective(r *ProjectiveGroupElement) {
-	FeMul(&r.X, &p.X, &p.T)
-	FeMul(&r.Y, &p.Y, &p.Z)
-	FeMul(&r.Z, &p.Z, &p.T)
-}
-
-func (p *CompletedGroupElement) ToExtended(r *ExtendedGroupElement) {
-	FeMul(&r.X, &p.X, &p.T)
-	FeMul(&r.Y, &p.Y, &p.Z)
-	FeMul(&r.Z, &p.Z, &p.T)
-	FeMul(&r.T, &p.X, &p.Y)
-}
-
-func (p *PreComputedGroupElement) Zero() {
-	FeOne(&p.yPlusX)
-	FeOne(&p.yMinusX)
-	FeZero(&p.xy2d)
-}
-
-func geAdd(r *CompletedGroupElement, p *ExtendedGroupElement, q *CachedGroupElement) {
-	var t0 FieldElement
-
-	FeAdd(&r.X, &p.Y, &p.X)
-	FeSub(&r.Y, &p.Y, &p.X)
-	FeMul(&r.Z, &r.X, &q.yPlusX)
-	FeMul(&r.Y, &r.Y, &q.yMinusX)
-	FeMul(&r.T, &q.T2d, &p.T)
-	FeMul(&r.X, &p.Z, &q.Z)
-	FeAdd(&t0, &r.X, &r.X)
-	FeSub(&r.X, &r.Z, &r.Y)
-	FeAdd(&r.Y, &r.Z, &r.Y)
-	FeAdd(&r.Z, &t0, &r.T)
-	FeSub(&r.T, &t0, &r.T)
-}
-
-func geSub(r *CompletedGroupElement, p *ExtendedGroupElement, q *CachedGroupElement) {
-	var t0 FieldElement
-
-	FeAdd(&r.X, &p.Y, &p.X)
-	FeSub(&r.Y, &p.Y, &p.X)
-	FeMul(&r.Z, &r.X, &q.yMinusX)
-	FeMul(&r.Y, &r.Y, &q.yPlusX)
-	FeMul(&r.T, &q.T2d, &p.T)
-	FeMul(&r.X, &p.Z, &q.Z)
-	FeAdd(&t0, &r.X, &r.X)
-	FeSub(&r.X, &r.Z, &r.Y)
-	FeAdd(&r.Y, &r.Z, &r.Y)
-	FeSub(&r.Z, &t0, &r.T)
-	FeAdd(&r.T, &t0, &r.T)
-}
-
-func geMixedAdd(r *CompletedGroupElement, p *ExtendedGroupElement, q *PreComputedGroupElement) {
-	var t0 FieldElement
-
-	FeAdd(&r.X, &p.Y, &p.X)
-	FeSub(&r.Y, &p.Y, &p.X)
-	FeMul(&r.Z, &r.X, &q.yPlusX)
-	FeMul(&r.Y, &r.Y, &q.yMinusX)
-	FeMul(&r.T, &q.xy2d, &p.T)
-	FeAdd(&t0, &p.Z, &p.Z)
-	FeSub(&r.X, &r.Z, &r.Y)
-	FeAdd(&r.Y, &r.Z, &r.Y)
-	FeAdd(&r.Z, &t0, &r.T)
-	FeSub(&r.T, &t0, &r.T)
-}
-
-func geMixedSub(r *CompletedGroupElement, p *ExtendedGroupElement, q *PreComputedGroupElement) {
-	var t0 FieldElement
-
-	FeAdd(&r.X, &p.Y, &p.X)
-	FeSub(&r.Y, &p.Y, &p.X)
-	FeMul(&r.Z, &r.X, &q.yMinusX)
-	FeMul(&r.Y, &r.Y, &q.yPlusX)
-	FeMul(&r.T, &q.xy2d, &p.T)
-	FeAdd(&t0, &p.Z, &p.Z)
-	FeSub(&r.X, &r.Z, &r.Y)
-	FeAdd(&r.Y, &r.Z, &r.Y)
-	FeSub(&r.Z, &t0, &r.T)
-	FeAdd(&r.T, &t0, &r.T)
-}
-
-func slide(r *[256]int8, a *[32]byte) {
-	for i := range r {
-		r[i] = int8(1 & (a[i>>3] >> uint(i&7)))
-	}
-
-	for i := range r {
-		if r[i] != 0 {
-			for b := 1; b <= 6 && i+b < 256; b++ {
-				if r[i+b] != 0 {
-					if r[i]+(r[i+b]<<uint(b)) <= 15 {
-						r[i] += r[i+b] << uint(b)
-						r[i+b] = 0
-					} else if r[i]-(r[i+b]<<uint(b)) >= -15 {
-						r[i] -= r[i+b] << uint(b)
-						for k := i + b; k < 256; k++ {
-							if r[k] == 0 {
-								r[k] = 1
-								break
-							}
-							r[k] = 0
-						}
-					} else {
-						break
-					}
-				}
-			}
-		}
-	}
-}
-
-// GeDoubleScalarMultVartime sets r = a*A + b*B
-// where a = a[0]+256*a[1]+...+256^31 a[31].
-// and b = b[0]+256*b[1]+...+256^31 b[31].
-// B is the Ed25519 base point (x,4/5) with x positive.
-func GeDoubleScalarMultVartime(r *ProjectiveGroupElement, a *[32]byte, A *ExtendedGroupElement, b *[32]byte) {
-	var aSlide, bSlide [256]int8
-	var Ai [8]CachedGroupElement // A,3A,5A,7A,9A,11A,13A,15A
-	var t CompletedGroupElement
-	var u, A2 ExtendedGroupElement
-	var i int
-
-	slide(&aSlide, a)
-	slide(&bSlide, b)
-
-	A.ToCached(&Ai[0])
-	A.Double(&t)
-	t.ToExtended(&A2)
-
-	for i := 0; i < 7; i++ {
-		geAdd(&t, &A2, &Ai[i])
-		t.ToExtended(&u)
-		u.ToCached(&Ai[i+1])
-	}
-
-	r.Zero()
-
-	for i = 255; i >= 0; i-- {
-		if aSlide[i] != 0 || bSlide[i] != 0 {
-			break
-		}
-	}
-
-	for ; i >= 0; i-- {
-		r.Double(&t)
-
-		if aSlide[i] > 0 {
-			t.ToExtended(&u)
-			geAdd(&t, &u, &Ai[aSlide[i]/2])
-		} else if aSlide[i] < 0 {
-			t.ToExtended(&u)
-			geSub(&t, &u, &Ai[(-aSlide[i])/2])
-		}
-
-		if bSlide[i] > 0 {
-			t.ToExtended(&u)
-			geMixedAdd(&t, &u, &bi[bSlide[i]/2])
-		} else if bSlide[i] < 0 {
-			t.ToExtended(&u)
-			geMixedSub(&t, &u, &bi[(-bSlide[i])/2])
-		}
-
-		t.ToProjective(r)
-	}
-}
-
-// equal returns 1 if b == c and 0 otherwise, assuming that b and c are
-// non-negative.
-func equal(b, c int32) int32 {
-	x := uint32(b ^ c)
-	x--
-	return int32(x >> 31)
-}
-
-// negative returns 1 if b < 0 and 0 otherwise.
-func negative(b int32) int32 {
-	return (b >> 31) & 1
-}
-
-func PreComputedGroupElementCMove(t, u *PreComputedGroupElement, b int32) {
-	FeCMove(&t.yPlusX, &u.yPlusX, b)
-	FeCMove(&t.yMinusX, &u.yMinusX, b)
-	FeCMove(&t.xy2d, &u.xy2d, b)
-}
-
-func selectPoint(t *PreComputedGroupElement, pos int32, b int32) {
-	var minusT PreComputedGroupElement
-	bNegative := negative(b)
-	bAbs := b - (((-bNegative) & b) << 1)
-
-	t.Zero()
-	for i := int32(0); i < 8; i++ {
-		PreComputedGroupElementCMove(t, &base[pos][i], equal(bAbs, i+1))
-	}
-	FeCopy(&minusT.yPlusX, &t.yMinusX)
-	FeCopy(&minusT.yMinusX, &t.yPlusX)
-	FeNeg(&minusT.xy2d, &t.xy2d)
-	PreComputedGroupElementCMove(t, &minusT, bNegative)
-}
-
-// GeScalarMultBase computes h = a*B, where
-//   a = a[0]+256*a[1]+...+256^31 a[31]
-//   B is the Ed25519 base point (x,4/5) with x positive.
-//
-// Preconditions:
-//   a[31] <= 127
-func GeScalarMultBase(h *ExtendedGroupElement, a *[32]byte) {
-	var e [64]int8
-
-	for i, v := range a {
-		e[2*i] = int8(v & 15)
-		e[2*i+1] = int8((v >> 4) & 15)
-	}
-
-	// each e[i] is between 0 and 15 and e[63] is between 0 and 7.
-
-	carry := int8(0)
-	for i := 0; i < 63; i++ {
-		e[i] += carry
-		carry = (e[i] + 8) >> 4
-		e[i] -= carry << 4
-	}
-	e[63] += carry
-	// each e[i] is between -8 and 8.
-
-	h.Zero()
-	var t PreComputedGroupElement
-	var r CompletedGroupElement
-	for i := int32(1); i < 64; i += 2 {
-		selectPoint(&t, i/2, int32(e[i]))
-		geMixedAdd(&r, h, &t)
-		r.ToExtended(h)
-	}
-
-	var s ProjectiveGroupElement
-
-	h.Double(&r)
-	r.ToProjective(&s)
-	s.Double(&r)
-	r.ToProjective(&s)
-	s.Double(&r)
-	r.ToProjective(&s)
-	s.Double(&r)
-	r.ToExtended(h)
-
-	for i := int32(0); i < 64; i += 2 {
-		selectPoint(&t, i/2, int32(e[i]))
-		geMixedAdd(&r, h, &t)
-		r.ToExtended(h)
-	}
-}
-
-// The scalars are GF(2^252 + 27742317777372353535851937790883648493).
-
-// Input:
-//   a[0]+256*a[1]+...+256^31*a[31] = a
-//   b[0]+256*b[1]+...+256^31*b[31] = b
-//   c[0]+256*c[1]+...+256^31*c[31] = c
-//
-// Output:
-//   s[0]+256*s[1]+...+256^31*s[31] = (ab+c) mod l
-//   where l = 2^252 + 27742317777372353535851937790883648493.
-func ScMulAdd(s, a, b, c *[32]byte) {
-	a0 := 2097151 & load3(a[:])
-	a1 := 2097151 & (load4(a[2:]) >> 5)
-	a2 := 2097151 & (load3(a[5:]) >> 2)
-	a3 := 2097151 & (load4(a[7:]) >> 7)
-	a4 := 2097151 & (load4(a[10:]) >> 4)
-	a5 := 2097151 & (load3(a[13:]) >> 1)
-	a6 := 2097151 & (load4(a[15:]) >> 6)
-	a7 := 2097151 & (load3(a[18:]) >> 3)
-	a8 := 2097151 & load3(a[21:])
-	a9 := 2097151 & (load4(a[23:]) >> 5)
-	a10 := 2097151 & (load3(a[26:]) >> 2)
-	a11 := (load4(a[28:]) >> 7)
-	b0 := 2097151 & load3(b[:])
-	b1 := 2097151 & (load4(b[2:]) >> 5)
-	b2 := 2097151 & (load3(b[5:]) >> 2)
-	b3 := 2097151 & (load4(b[7:]) >> 7)
-	b4 := 2097151 & (load4(b[10:]) >> 4)
-	b5 := 2097151 & (load3(b[13:]) >> 1)
-	b6 := 2097151 & (load4(b[15:]) >> 6)
-	b7 := 2097151 & (load3(b[18:]) >> 3)
-	b8 := 2097151 & load3(b[21:])
-	b9 := 2097151 & (load4(b[23:]) >> 5)
-	b10 := 2097151 & (load3(b[26:]) >> 2)
-	b11 := (load4(b[28:]) >> 7)
-	c0 := 2097151 & load3(c[:])
-	c1 := 2097151 & (load4(c[2:]) >> 5)
-	c2 := 2097151 & (load3(c[5:]) >> 2)
-	c3 := 2097151 & (load4(c[7:]) >> 7)
-	c4 := 2097151 & (load4(c[10:]) >> 4)
-	c5 := 2097151 & (load3(c[13:]) >> 1)
-	c6 := 2097151 & (load4(c[15:]) >> 6)
-	c7 := 2097151 & (load3(c[18:]) >> 3)
-	c8 := 2097151 & load3(c[21:])
-	c9 := 2097151 & (load4(c[23:]) >> 5)
-	c10 := 2097151 & (load3(c[26:]) >> 2)
-	c11 := (load4(c[28:]) >> 7)
-	var carry [23]int64
-
-	s0 := c0 + a0*b0
-	s1 := c1 + a0*b1 + a1*b0
-	s2 := c2 + a0*b2 + a1*b1 + a2*b0
-	s3 := c3 + a0*b3 + a1*b2 + a2*b1 + a3*b0
-	s4 := c4 + a0*b4 + a1*b3 + a2*b2 + a3*b1 + a4*b0
-	s5 := c5 + a0*b5 + a1*b4 + a2*b3 + a3*b2 + a4*b1 + a5*b0
-	s6 := c6 + a0*b6 + a1*b5 + a2*b4 + a3*b3 + a4*b2 + a5*b1 + a6*b0
-	s7 := c7 + a0*b7 + a1*b6 + a2*b5 + a3*b4 + a4*b3 + a5*b2 + a6*b1 + a7*b0
-	s8 := c8 + a0*b8 + a1*b7 + a2*b6 + a3*b5 + a4*b4 + a5*b3 + a6*b2 + a7*b1 + a8*b0
-	s9 := c9 + a0*b9 + a1*b8 + a2*b7 + a3*b6 + a4*b5 + a5*b4 + a6*b3 + a7*b2 + a8*b1 + a9*b0
-	s10 := c10 + a0*b10 + a1*b9 + a2*b8 + a3*b7 + a4*b6 + a5*b5 + a6*b4 + a7*b3 + a8*b2 + a9*b1 + a10*b0
-	s11 := c11 + a0*b11 + a1*b10 + a2*b9 + a3*b8 + a4*b7 + a5*b6 + a6*b5 + a7*b4 + a8*b3 + a9*b2 + a10*b1 + a11*b0
-	s12 := a1*b11 + a2*b10 + a3*b9 + a4*b8 + a5*b7 + a6*b6 + a7*b5 + a8*b4 + a9*b3 + a10*b2 + a11*b1
-	s13 := a2*b11 + a3*b10 + a4*b9 + a5*b8 + a6*b7 + a7*b6 + a8*b5 + a9*b4 + a10*b3 + a11*b2
-	s14 := a3*b11 + a4*b10 + a5*b9 + a6*b8 + a7*b7 + a8*b6 + a9*b5 + a10*b4 + a11*b3
-	s15 := a4*b11 + a5*b10 + a6*b9 + a7*b8 + a8*b7 + a9*b6 + a10*b5 + a11*b4
-	s16 := a5*b11 + a6*b10 + a7*b9 + a8*b8 + a9*b7 + a10*b6 + a11*b5
-	s17 := a6*b11 + a7*b10 + a8*b9 + a9*b8 + a10*b7 + a11*b6
-	s18 := a7*b11 + a8*b10 + a9*b9 + a10*b8 + a11*b7
-	s19 := a8*b11 + a9*b10 + a10*b9 + a11*b8
-	s20 := a9*b11 + a10*b10 + a11*b9
-	s21 := a10*b11 + a11*b10
-	s22 := a11 * b11
-	s23 := int64(0)
-
-	carry[0] = (s0 + (1 << 20)) >> 21
-	s1 += carry[0]
-	s0 -= carry[0] << 21
-	carry[2] = (s2 + (1 << 20)) >> 21
-	s3 += carry[2]
-	s2 -= carry[2] << 21
-	carry[4] = (s4 + (1 << 20)) >> 21
-	s5 += carry[4]
-	s4 -= carry[4] << 21
-	carry[6] = (s6 + (1 << 20)) >> 21
-	s7 += carry[6]
-	s6 -= carry[6] << 21
-	carry[8] = (s8 + (1 << 20)) >> 21
-	s9 += carry[8]
-	s8 -= carry[8] << 21
-	carry[10] = (s10 + (1 << 20)) >> 21
-	s11 += carry[10]
-	s10 -= carry[10] << 21
-	carry[12] = (s12 + (1 << 20)) >> 21
-	s13 += carry[12]
-	s12 -= carry[12] << 21
-	carry[14] = (s14 + (1 << 20)) >> 21
-	s15 += carry[14]
-	s14 -= carry[14] << 21
-	carry[16] = (s16 + (1 << 20)) >> 21
-	s17 += carry[16]
-	s16 -= carry[16] << 21
-	carry[18] = (s18 + (1 << 20)) >> 21
-	s19 += carry[18]
-	s18 -= carry[18] << 21
-	carry[20] = (s20 + (1 << 20)) >> 21
-	s21 += carry[20]
-	s20 -= carry[20] << 21
-	carry[22] = (s22 + (1 << 20)) >> 21
-	s23 += carry[22]
-	s22 -= carry[22] << 21
-
-	carry[1] = (s1 + (1 << 20)) >> 21
-	s2 += carry[1]
-	s1 -= carry[1] << 21
-	carry[3] = (s3 + (1 << 20)) >> 21
-	s4 += carry[3]
-	s3 -= carry[3] << 21
-	carry[5] = (s5 + (1 << 20)) >> 21
-	s6 += carry[5]
-	s5 -= carry[5] << 21
-	carry[7] = (s7 + (1 << 20)) >> 21
-	s8 += carry[7]
-	s7 -= carry[7] << 21
-	carry[9] = (s9 + (1 << 20)) >> 21
-	s10 += carry[9]
-	s9 -= carry[9] << 21
-	carry[11] = (s11 + (1 << 20)) >> 21
-	s12 += carry[11]
-	s11 -= carry[11] << 21
-	carry[13] = (s13 + (1 << 20)) >> 21
-	s14 += carry[13]
-	s13 -= carry[13] << 21
-	carry[15] = (s15 + (1 << 20)) >> 21
-	s16 += carry[15]
-	s15 -= carry[15] << 21
-	carry[17] = (s17 + (1 << 20)) >> 21
-	s18 += carry[17]
-	s17 -= carry[17] << 21
-	carry[19] = (s19 + (1 << 20)) >> 21
-	s20 += carry[19]
-	s19 -= carry[19] << 21
-	carry[21] = (s21 + (1 << 20)) >> 21
-	s22 += carry[21]
-	s21 -= carry[21] << 21
-
-	s11 += s23 * 666643
-	s12 += s23 * 470296
-	s13 += s23 * 654183
-	s14 -= s23 * 997805
-	s15 += s23 * 136657
-	s16 -= s23 * 683901
-	s23 = 0
-
-	s10 += s22 * 666643
-	s11 += s22 * 470296
-	s12 += s22 * 654183
-	s13 -= s22 * 997805
-	s14 += s22 * 136657
-	s15 -= s22 * 683901
-	s22 = 0
-
-	s9 += s21 * 666643
-	s10 += s21 * 470296
-	s11 += s21 * 654183
-	s12 -= s21 * 997805
-	s13 += s21 * 136657
-	s14 -= s21 * 683901
-	s21 = 0
-
-	s8 += s20 * 666643
-	s9 += s20 * 470296
-	s10 += s20 * 654183
-	s11 -= s20 * 997805
-	s12 += s20 * 136657
-	s13 -= s20 * 683901
-	s20 = 0
-
-	s7 += s19 * 666643
-	s8 += s19 * 470296
-	s9 += s19 * 654183
-	s10 -= s19 * 997805
-	s11 += s19 * 136657
-	s12 -= s19 * 683901
-	s19 = 0
-
-	s6 += s18 * 666643
-	s7 += s18 * 470296
-	s8 += s18 * 654183
-	s9 -= s18 * 997805
-	s10 += s18 * 136657
-	s11 -= s18 * 683901
-	s18 = 0
-
-	carry[6] = (s6 + (1 << 20)) >> 21
-	s7 += carry[6]
-	s6 -= carry[6] << 21
-	carry[8] = (s8 + (1 << 20)) >> 21
-	s9 += carry[8]
-	s8 -= carry[8] << 21
-	carry[10] = (s10 + (1 << 20)) >> 21
-	s11 += carry[10]
-	s10 -= carry[10] << 21
-	carry[12] = (s12 + (1 << 20)) >> 21
-	s13 += carry[12]
-	s12 -= carry[12] << 21
-	carry[14] = (s14 + (1 << 20)) >> 21
-	s15 += carry[14]
-	s14 -= carry[14] << 21
-	carry[16] = (s16 + (1 << 20)) >> 21
-	s17 += carry[16]
-	s16 -= carry[16] << 21
-
-	carry[7] = (s7 + (1 << 20)) >> 21
-	s8 += carry[7]
-	s7 -= carry[7] << 21
-	carry[9] = (s9 + (1 << 20)) >> 21
-	s10 += carry[9]
-	s9 -= carry[9] << 21
-	carry[11] = (s11 + (1 << 20)) >> 21
-	s12 += carry[11]
-	s11 -= carry[11] << 21
-	carry[13] = (s13 + (1 << 20)) >> 21
-	s14 += carry[13]
-	s13 -= carry[13] << 21
-	carry[15] = (s15 + (1 << 20)) >> 21
-	s16 += carry[15]
-	s15 -= carry[15] << 21
-
-	s5 += s17 * 666643
-	s6 += s17 * 470296
-	s7 += s17 * 654183
-	s8 -= s17 * 997805
-	s9 += s17 * 136657
-	s10 -= s17 * 683901
-	s17 = 0
-
-	s4 += s16 * 666643
-	s5 += s16 * 470296
-	s6 += s16 * 654183
-	s7 -= s16 * 997805
-	s8 += s16 * 136657
-	s9 -= s16 * 683901
-	s16 = 0
-
-	s3 += s15 * 666643
-	s4 += s15 * 470296
-	s5 += s15 * 654183
-	s6 -= s15 * 997805
-	s7 += s15 * 136657
-	s8 -= s15 * 683901
-	s15 = 0
-
-	s2 += s14 * 666643
-	s3 += s14 * 470296
-	s4 += s14 * 654183
-	s5 -= s14 * 997805
-	s6 += s14 * 136657
-	s7 -= s14 * 683901
-	s14 = 0
-
-	s1 += s13 * 666643
-	s2 += s13 * 470296
-	s3 += s13 * 654183
-	s4 -= s13 * 997805
-	s5 += s13 * 136657
-	s6 -= s13 * 683901
-	s13 = 0
-
-	s0 += s12 * 666643
-	s1 += s12 * 470296
-	s2 += s12 * 654183
-	s3 -= s12 * 997805
-	s4 += s12 * 136657
-	s5 -= s12 * 683901
-	s12 = 0
-
-	carry[0] = (s0 + (1 << 20)) >> 21
-	s1 += carry[0]
-	s0 -= carry[0] << 21
-	carry[2] = (s2 + (1 << 20)) >> 21
-	s3 += carry[2]
-	s2 -= carry[2] << 21
-	carry[4] = (s4 + (1 << 20)) >> 21
-	s5 += carry[4]
-	s4 -= carry[4] << 21
-	carry[6] = (s6 + (1 << 20)) >> 21
-	s7 += carry[6]
-	s6 -= carry[6] << 21
-	carry[8] = (s8 + (1 << 20)) >> 21
-	s9 += carry[8]
-	s8 -= carry[8] << 21
-	carry[10] = (s10 + (1 << 20)) >> 21
-	s11 += carry[10]
-	s10 -= carry[10] << 21
-
-	carry[1] = (s1 + (1 << 20)) >> 21
-	s2 += carry[1]
-	s1 -= carry[1] << 21
-	carry[3] = (s3 + (1 << 20)) >> 21
-	s4 += carry[3]
-	s3 -= carry[3] << 21
-	carry[5] = (s5 + (1 << 20)) >> 21
-	s6 += carry[5]
-	s5 -= carry[5] << 21
-	carry[7] = (s7 + (1 << 20)) >> 21
-	s8 += carry[7]
-	s7 -= carry[7] << 21
-	carry[9] = (s9 + (1 << 20)) >> 21
-	s10 += carry[9]
-	s9 -= carry[9] << 21
-	carry[11] = (s11 + (1 << 20)) >> 21
-	s12 += carry[11]
-	s11 -= carry[11] << 21
-
-	s0 += s12 * 666643
-	s1 += s12 * 470296
-	s2 += s12 * 654183
-	s3 -= s12 * 997805
-	s4 += s12 * 136657
-	s5 -= s12 * 683901
-	s12 = 0
-
-	carry[0] = s0 >> 21
-	s1 += carry[0]
-	s0 -= carry[0] << 21
-	carry[1] = s1 >> 21
-	s2 += carry[1]
-	s1 -= carry[1] << 21
-	carry[2] = s2 >> 21
-	s3 += carry[2]
-	s2 -= carry[2] << 21
-	carry[3] = s3 >> 21
-	s4 += carry[3]
-	s3 -= carry[3] << 21
-	carry[4] = s4 >> 21
-	s5 += carry[4]
-	s4 -= carry[4] << 21
-	carry[5] = s5 >> 21
-	s6 += carry[5]
-	s5 -= carry[5] << 21
-	carry[6] = s6 >> 21
-	s7 += carry[6]
-	s6 -= carry[6] << 21
-	carry[7] = s7 >> 21
-	s8 += carry[7]
-	s7 -= carry[7] << 21
-	carry[8] = s8 >> 21
-	s9 += carry[8]
-	s8 -= carry[8] << 21
-	carry[9] = s9 >> 21
-	s10 += carry[9]
-	s9 -= carry[9] << 21
-	carry[10] = s10 >> 21
-	s11 += carry[10]
-	s10 -= carry[10] << 21
-	carry[11] = s11 >> 21
-	s12 += carry[11]
-	s11 -= carry[11] << 21
-
-	s0 += s12 * 666643
-	s1 += s12 * 470296
-	s2 += s12 * 654183
-	s3 -= s12 * 997805
-	s4 += s12 * 136657
-	s5 -= s12 * 683901
-	s12 = 0
-
-	carry[0] = s0 >> 21
-	s1 += carry[0]
-	s0 -= carry[0] << 21
-	carry[1] = s1 >> 21
-	s2 += carry[1]
-	s1 -= carry[1] << 21
-	carry[2] = s2 >> 21
-	s3 += carry[2]
-	s2 -= carry[2] << 21
-	carry[3] = s3 >> 21
-	s4 += carry[3]
-	s3 -= carry[3] << 21
-	carry[4] = s4 >> 21
-	s5 += carry[4]
-	s4 -= carry[4] << 21
-	carry[5] = s5 >> 21
-	s6 += carry[5]
-	s5 -= carry[5] << 21
-	carry[6] = s6 >> 21
-	s7 += carry[6]
-	s6 -= carry[6] << 21
-	carry[7] = s7 >> 21
-	s8 += carry[7]
-	s7 -= carry[7] << 21
-	carry[8] = s8 >> 21
-	s9 += carry[8]
-	s8 -= carry[8] << 21
-	carry[9] = s9 >> 21
-	s10 += carry[9]
-	s9 -= carry[9] << 21
-	carry[10] = s10 >> 21
-	s11 += carry[10]
-	s10 -= carry[10] << 21
-
-	s[0] = byte(s0 >> 0)
-	s[1] = byte(s0 >> 8)
-	s[2] = byte((s0 >> 16) | (s1 << 5))
-	s[3] = byte(s1 >> 3)
-	s[4] = byte(s1 >> 11)
-	s[5] = byte((s1 >> 19) | (s2 << 2))
-	s[6] = byte(s2 >> 6)
-	s[7] = byte((s2 >> 14) | (s3 << 7))
-	s[8] = byte(s3 >> 1)
-	s[9] = byte(s3 >> 9)
-	s[10] = byte((s3 >> 17) | (s4 << 4))
-	s[11] = byte(s4 >> 4)
-	s[12] = byte(s4 >> 12)
-	s[13] = byte((s4 >> 20) | (s5 << 1))
-	s[14] = byte(s5 >> 7)
-	s[15] = byte((s5 >> 15) | (s6 << 6))
-	s[16] = byte(s6 >> 2)
-	s[17] = byte(s6 >> 10)
-	s[18] = byte((s6 >> 18) | (s7 << 3))
-	s[19] = byte(s7 >> 5)
-	s[20] = byte(s7 >> 13)
-	s[21] = byte(s8 >> 0)
-	s[22] = byte(s8 >> 8)
-	s[23] = byte((s8 >> 16) | (s9 << 5))
-	s[24] = byte(s9 >> 3)
-	s[25] = byte(s9 >> 11)
-	s[26] = byte((s9 >> 19) | (s10 << 2))
-	s[27] = byte(s10 >> 6)
-	s[28] = byte((s10 >> 14) | (s11 << 7))
-	s[29] = byte(s11 >> 1)
-	s[30] = byte(s11 >> 9)
-	s[31] = byte(s11 >> 17)
-}
-
-// Input:
-//   s[0]+256*s[1]+...+256^63*s[63] = s
-//
-// Output:
-//   s[0]+256*s[1]+...+256^31*s[31] = s mod l
-//   where l = 2^252 + 27742317777372353535851937790883648493.
-func ScReduce(out *[32]byte, s *[64]byte) {
-	s0 := 2097151 & load3(s[:])
-	s1 := 2097151 & (load4(s[2:]) >> 5)
-	s2 := 2097151 & (load3(s[5:]) >> 2)
-	s3 := 2097151 & (load4(s[7:]) >> 7)
-	s4 := 2097151 & (load4(s[10:]) >> 4)
-	s5 := 2097151 & (load3(s[13:]) >> 1)
-	s6 := 2097151 & (load4(s[15:]) >> 6)
-	s7 := 2097151 & (load3(s[18:]) >> 3)
-	s8 := 2097151 & load3(s[21:])
-	s9 := 2097151 & (load4(s[23:]) >> 5)
-	s10 := 2097151 & (load3(s[26:]) >> 2)
-	s11 := 2097151 & (load4(s[28:]) >> 7)
-	s12 := 2097151 & (load4(s[31:]) >> 4)
-	s13 := 2097151 & (load3(s[34:]) >> 1)
-	s14 := 2097151 & (load4(s[36:]) >> 6)
-	s15 := 2097151 & (load3(s[39:]) >> 3)
-	s16 := 2097151 & load3(s[42:])
-	s17 := 2097151 & (load4(s[44:]) >> 5)
-	s18 := 2097151 & (load3(s[47:]) >> 2)
-	s19 := 2097151 & (load4(s[49:]) >> 7)
-	s20 := 2097151 & (load4(s[52:]) >> 4)
-	s21 := 2097151 & (load3(s[55:]) >> 1)
-	s22 := 2097151 & (load4(s[57:]) >> 6)
-	s23 := (load4(s[60:]) >> 3)
-
-	s11 += s23 * 666643
-	s12 += s23 * 470296
-	s13 += s23 * 654183
-	s14 -= s23 * 997805
-	s15 += s23 * 136657
-	s16 -= s23 * 683901
-	s23 = 0
-
-	s10 += s22 * 666643
-	s11 += s22 * 470296
-	s12 += s22 * 654183
-	s13 -= s22 * 997805
-	s14 += s22 * 136657
-	s15 -= s22 * 683901
-	s22 = 0
-
-	s9 += s21 * 666643
-	s10 += s21 * 470296
-	s11 += s21 * 654183
-	s12 -= s21 * 997805
-	s13 += s21 * 136657
-	s14 -= s21 * 683901
-	s21 = 0
-
-	s8 += s20 * 666643
-	s9 += s20 * 470296
-	s10 += s20 * 654183
-	s11 -= s20 * 997805
-	s12 += s20 * 136657
-	s13 -= s20 * 683901
-	s20 = 0
-
-	s7 += s19 * 666643
-	s8 += s19 * 470296
-	s9 += s19 * 654183
-	s10 -= s19 * 997805
-	s11 += s19 * 136657
-	s12 -= s19 * 683901
-	s19 = 0
-
-	s6 += s18 * 666643
-	s7 += s18 * 470296
-	s8 += s18 * 654183
-	s9 -= s18 * 997805
-	s10 += s18 * 136657
-	s11 -= s18 * 683901
-	s18 = 0
-
-	var carry [17]int64
-
-	carry[6] = (s6 + (1 << 20)) >> 21
-	s7 += carry[6]
-	s6 -= carry[6] << 21
-	carry[8] = (s8 + (1 << 20)) >> 21
-	s9 += carry[8]
-	s8 -= carry[8] << 21
-	carry[10] = (s10 + (1 << 20)) >> 21
-	s11 += carry[10]
-	s10 -= carry[10] << 21
-	carry[12] = (s12 + (1 << 20)) >> 21
-	s13 += carry[12]
-	s12 -= carry[12] << 21
-	carry[14] = (s14 + (1 << 20)) >> 21
-	s15 += carry[14]
-	s14 -= carry[14] << 21
-	carry[16] = (s16 + (1 << 20)) >> 21
-	s17 += carry[16]
-	s16 -= carry[16] << 21
-
-	carry[7] = (s7 + (1 << 20)) >> 21
-	s8 += carry[7]
-	s7 -= carry[7] << 21
-	carry[9] = (s9 + (1 << 20)) >> 21
-	s10 += carry[9]
-	s9 -= carry[9] << 21
-	carry[11] = (s11 + (1 << 20)) >> 21
-	s12 += carry[11]
-	s11 -= carry[11] << 21
-	carry[13] = (s13 + (1 << 20)) >> 21
-	s14 += carry[13]
-	s13 -= carry[13] << 21
-	carry[15] = (s15 + (1 << 20)) >> 21
-	s16 += carry[15]
-	s15 -= carry[15] << 21
-
-	s5 += s17 * 666643
-	s6 += s17 * 470296
-	s7 += s17 * 654183
-	s8 -= s17 * 997805
-	s9 += s17 * 136657
-	s10 -= s17 * 683901
-	s17 = 0
-
-	s4 += s16 * 666643
-	s5 += s16 * 470296
-	s6 += s16 * 654183
-	s7 -= s16 * 997805
-	s8 += s16 * 136657
-	s9 -= s16 * 683901
-	s16 = 0
-
-	s3 += s15 * 666643
-	s4 += s15 * 470296
-	s5 += s15 * 654183
-	s6 -= s15 * 997805
-	s7 += s15 * 136657
-	s8 -= s15 * 683901
-	s15 = 0
-
-	s2 += s14 * 666643
-	s3 += s14 * 470296
-	s4 += s14 * 654183
-	s5 -= s14 * 997805
-	s6 += s14 * 136657
-	s7 -= s14 * 683901
-	s14 = 0
-
-	s1 += s13 * 666643
-	s2 += s13 * 470296
-	s3 += s13 * 654183
-	s4 -= s13 * 997805
-	s5 += s13 * 136657
-	s6 -= s13 * 683901
-	s13 = 0
-
-	s0 += s12 * 666643
-	s1 += s12 * 470296
-	s2 += s12 * 654183
-	s3 -= s12 * 997805
-	s4 += s12 * 136657
-	s5 -= s12 * 683901
-	s12 = 0
-
-	carry[0] = (s0 + (1 << 20)) >> 21
-	s1 += carry[0]
-	s0 -= carry[0] << 21
-	carry[2] = (s2 + (1 << 20)) >> 21
-	s3 += carry[2]
-	s2 -= carry[2] << 21
-	carry[4] = (s4 + (1 << 20)) >> 21
-	s5 += carry[4]
-	s4 -= carry[4] << 21
-	carry[6] = (s6 + (1 << 20)) >> 21
-	s7 += carry[6]
-	s6 -= carry[6] << 21
-	carry[8] = (s8 + (1 << 20)) >> 21
-	s9 += carry[8]
-	s8 -= carry[8] << 21
-	carry[10] = (s10 + (1 << 20)) >> 21
-	s11 += carry[10]
-	s10 -= carry[10] << 21
-
-	carry[1] = (s1 + (1 << 20)) >> 21
-	s2 += carry[1]
-	s1 -= carry[1] << 21
-	carry[3] = (s3 + (1 << 20)) >> 21
-	s4 += carry[3]
-	s3 -= carry[3] << 21
-	carry[5] = (s5 + (1 << 20)) >> 21
-	s6 += carry[5]
-	s5 -= carry[5] << 21
-	carry[7] = (s7 + (1 << 20)) >> 21
-	s8 += carry[7]
-	s7 -= carry[7] << 21
-	carry[9] = (s9 + (1 << 20)) >> 21
-	s10 += carry[9]
-	s9 -= carry[9] << 21
-	carry[11] = (s11 + (1 << 20)) >> 21
-	s12 += carry[11]
-	s11 -= carry[11] << 21
-
-	s0 += s12 * 666643
-	s1 += s12 * 470296
-	s2 += s12 * 654183
-	s3 -= s12 * 997805
-	s4 += s12 * 136657
-	s5 -= s12 * 683901
-	s12 = 0
-
-	carry[0] = s0 >> 21
-	s1 += carry[0]
-	s0 -= carry[0] << 21
-	carry[1] = s1 >> 21
-	s2 += carry[1]
-	s1 -= carry[1] << 21
-	carry[2] = s2 >> 21
-	s3 += carry[2]
-	s2 -= carry[2] << 21
-	carry[3] = s3 >> 21
-	s4 += carry[3]
-	s3 -= carry[3] << 21
-	carry[4] = s4 >> 21
-	s5 += carry[4]
-	s4 -= carry[4] << 21
-	carry[5] = s5 >> 21
-	s6 += carry[5]
-	s5 -= carry[5] << 21
-	carry[6] = s6 >> 21
-	s7 += carry[6]
-	s6 -= carry[6] << 21
-	carry[7] = s7 >> 21
-	s8 += carry[7]
-	s7 -= carry[7] << 21
-	carry[8] = s8 >> 21
-	s9 += carry[8]
-	s8 -= carry[8] << 21
-	carry[9] = s9 >> 21
-	s10 += carry[9]
-	s9 -= carry[9] << 21
-	carry[10] = s10 >> 21
-	s11 += carry[10]
-	s10 -= carry[10] << 21
-	carry[11] = s11 >> 21
-	s12 += carry[11]
-	s11 -= carry[11] << 21
-
-	s0 += s12 * 666643
-	s1 += s12 * 470296
-	s2 += s12 * 654183
-	s3 -= s12 * 997805
-	s4 += s12 * 136657
-	s5 -= s12 * 683901
-	s12 = 0
-
-	carry[0] = s0 >> 21
-	s1 += carry[0]
-	s0 -= carry[0] << 21
-	carry[1] = s1 >> 21
-	s2 += carry[1]
-	s1 -= carry[1] << 21
-	carry[2] = s2 >> 21
-	s3 += carry[2]
-	s2 -= carry[2] << 21
-	carry[3] = s3 >> 21
-	s4 += carry[3]
-	s3 -= carry[3] << 21
-	carry[4] = s4 >> 21
-	s5 += carry[4]
-	s4 -= carry[4] << 21
-	carry[5] = s5 >> 21
-	s6 += carry[5]
-	s5 -= carry[5] << 21
-	carry[6] = s6 >> 21
-	s7 += carry[6]
-	s6 -= carry[6] << 21
-	carry[7] = s7 >> 21
-	s8 += carry[7]
-	s7 -= carry[7] << 21
-	carry[8] = s8 >> 21
-	s9 += carry[8]
-	s8 -= carry[8] << 21
-	carry[9] = s9 >> 21
-	s10 += carry[9]
-	s9 -= carry[9] << 21
-	carry[10] = s10 >> 21
-	s11 += carry[10]
-	s10 -= carry[10] << 21
-
-	out[0] = byte(s0 >> 0)
-	out[1] = byte(s0 >> 8)
-	out[2] = byte((s0 >> 16) | (s1 << 5))
-	out[3] = byte(s1 >> 3)
-	out[4] = byte(s1 >> 11)
-	out[5] = byte((s1 >> 19) | (s2 << 2))
-	out[6] = byte(s2 >> 6)
-	out[7] = byte((s2 >> 14) | (s3 << 7))
-	out[8] = byte(s3 >> 1)
-	out[9] = byte(s3 >> 9)
-	out[10] = byte((s3 >> 17) | (s4 << 4))
-	out[11] = byte(s4 >> 4)
-	out[12] = byte(s4 >> 12)
-	out[13] = byte((s4 >> 20) | (s5 << 1))
-	out[14] = byte(s5 >> 7)
-	out[15] = byte((s5 >> 15) | (s6 << 6))
-	out[16] = byte(s6 >> 2)
-	out[17] = byte(s6 >> 10)
-	out[18] = byte((s6 >> 18) | (s7 << 3))
-	out[19] = byte(s7 >> 5)
-	out[20] = byte(s7 >> 13)
-	out[21] = byte(s8 >> 0)
-	out[22] = byte(s8 >> 8)
-	out[23] = byte((s8 >> 16) | (s9 << 5))
-	out[24] = byte(s9 >> 3)
-	out[25] = byte(s9 >> 11)
-	out[26] = byte((s9 >> 19) | (s10 << 2))
-	out[27] = byte(s10 >> 6)
-	out[28] = byte((s10 >> 14) | (s11 << 7))
-	out[29] = byte(s11 >> 1)
-	out[30] = byte(s11 >> 9)
-	out[31] = byte(s11 >> 17)
-}
-
-// order is the order of Curve25519 in little-endian form.
-var order = [4]uint64{0x5812631a5cf5d3ed, 0x14def9dea2f79cd6, 0, 0x1000000000000000}
-
-// ScMinimal returns true if the given scalar is less than the order of the
-// curve.
-func ScMinimal(scalar *[32]byte) bool {
-	for i := 3; ; i-- {
-		v := binary.LittleEndian.Uint64(scalar[i*8:])
-		if v > order[i] {
-			return false
-		} else if v < order[i] {
-			break
-		} else if i == 0 {
-			return false
-		}
-	}
-
-	return true
-}
diff --git a/vendor/golang.org/x/crypto/internal/poly1305/sum_generic.go b/vendor/golang.org/x/crypto/internal/poly1305/sum_generic.go
index c942a6590..e041da5ea 100644
--- a/vendor/golang.org/x/crypto/internal/poly1305/sum_generic.go
+++ b/vendor/golang.org/x/crypto/internal/poly1305/sum_generic.go
@@ -136,7 +136,7 @@ func shiftRightBy2(a uint128) uint128 {
 // updateGeneric absorbs msg into the state.h accumulator. For each chunk m of
 // 128 bits of message, it computes
 //
-//     h₊ = (h + m) * r  mod  2¹³⁰ - 5
+//	h₊ = (h + m) * r  mod  2¹³⁰ - 5
 //
 // If the msg length is not a multiple of TagSize, it assumes the last
 // incomplete chunk is the final one.
@@ -278,8 +278,7 @@ const (
 
 // finalize completes the modular reduction of h and computes
 //
-//     out = h + s  mod  2¹²⁸
-//
+//	out = h + s  mod  2¹²⁸
 func finalize(out *[TagSize]byte, h *[3]uint64, s *[2]uint64) {
 	h0, h1, h2 := h[0], h[1], h[2]
 
diff --git a/vendor/golang.org/x/crypto/internal/poly1305/sum_s390x.go b/vendor/golang.org/x/crypto/internal/poly1305/sum_s390x.go
index 62cc9f847..ec9596688 100644
--- a/vendor/golang.org/x/crypto/internal/poly1305/sum_s390x.go
+++ b/vendor/golang.org/x/crypto/internal/poly1305/sum_s390x.go
@@ -14,6 +14,7 @@ import (
 // updateVX is an assembly implementation of Poly1305 that uses vector
 // instructions. It must only be called if the vector facility (vx) is
 // available.
+//
 //go:noescape
 func updateVX(state *macState, msg []byte)
 
diff --git a/vendor/golang.org/x/crypto/openpgp/armor/armor.go b/vendor/golang.org/x/crypto/openpgp/armor/armor.go
index ebc87876e..be342ad47 100644
--- a/vendor/golang.org/x/crypto/openpgp/armor/armor.go
+++ b/vendor/golang.org/x/crypto/openpgp/armor/armor.go
@@ -23,12 +23,14 @@ import (
 // A Block represents an OpenPGP armored structure.
 //
 // The encoded form is:
-//    -----BEGIN Type-----
-//    Headers
 //
-//    base64-encoded Bytes
-//    '=' base64 encoded checksum
-//    -----END Type-----
+//	-----BEGIN Type-----
+//	Headers
+//
+//	base64-encoded Bytes
+//	'=' base64 encoded checksum
+//	-----END Type-----
+//
 // where Headers is a possibly empty sequence of Key: Value lines.
 //
 // Since the armored data can be very large, this package presents a streaming
diff --git a/vendor/golang.org/x/crypto/openpgp/armor/encode.go b/vendor/golang.org/x/crypto/openpgp/armor/encode.go
index 6f07582c3..5b6e16c19 100644
--- a/vendor/golang.org/x/crypto/openpgp/armor/encode.go
+++ b/vendor/golang.org/x/crypto/openpgp/armor/encode.go
@@ -96,7 +96,8 @@ func (l *lineBreaker) Close() (err error) {
 // trailer.
 //
 // It's built into a stack of io.Writers:
-//    encoding -> base64 encoder -> lineBreaker -> out
+//
+//	encoding -> base64 encoder -> lineBreaker -> out
 type encoding struct {
 	out       io.Writer
 	breaker   *lineBreaker
diff --git a/vendor/golang.org/x/crypto/openpgp/elgamal/elgamal.go b/vendor/golang.org/x/crypto/openpgp/elgamal/elgamal.go
index 84396a089..743b35a12 100644
--- a/vendor/golang.org/x/crypto/openpgp/elgamal/elgamal.go
+++ b/vendor/golang.org/x/crypto/openpgp/elgamal/elgamal.go
@@ -77,8 +77,8 @@ func Encrypt(random io.Reader, pub *PublicKey, msg []byte) (c1, c2 *big.Int, err
 // returns the plaintext of the message. An error can result only if the
 // ciphertext is invalid. Users should keep in mind that this is a padding
 // oracle and thus, if exposed to an adaptive chosen ciphertext attack, can
-// be used to break the cryptosystem.  See ``Chosen Ciphertext Attacks
-// Against Protocols Based on the RSA Encryption Standard PKCS #1'', Daniel
+// be used to break the cryptosystem.  See “Chosen Ciphertext Attacks
+// Against Protocols Based on the RSA Encryption Standard PKCS #1”, Daniel
 // Bleichenbacher, Advances in Cryptology (Crypto '98),
 func Decrypt(priv *PrivateKey, c1, c2 *big.Int) (msg []byte, err error) {
 	s := new(big.Int).Exp(c1, priv.X, priv.P)
diff --git a/vendor/golang.org/x/crypto/pbkdf2/pbkdf2.go b/vendor/golang.org/x/crypto/pbkdf2/pbkdf2.go
index 593f65300..904b57e01 100644
--- a/vendor/golang.org/x/crypto/pbkdf2/pbkdf2.go
+++ b/vendor/golang.org/x/crypto/pbkdf2/pbkdf2.go
@@ -32,7 +32,7 @@ import (
 // can get a derived key for e.g. AES-256 (which needs a 32-byte key) by
 // doing:
 //
-// 	dk := pbkdf2.Key([]byte("some password"), salt, 4096, 32, sha1.New)
+//	dk := pbkdf2.Key([]byte("some password"), salt, 4096, 32, sha1.New)
 //
 // Remember to get a good random salt. At least 8 bytes is recommended by the
 // RFC.
diff --git a/vendor/golang.org/x/crypto/ssh/agent/client.go b/vendor/golang.org/x/crypto/ssh/agent/client.go
index b909471cc..dbc79d583 100644
--- a/vendor/golang.org/x/crypto/ssh/agent/client.go
+++ b/vendor/golang.org/x/crypto/ssh/agent/client.go
@@ -8,7 +8,8 @@
 // ssh-agent process using the sample server.
 //
 // References:
-//  [PROTOCOL.agent]: https://tools.ietf.org/html/draft-miller-ssh-agent-00
+//
+//	[PROTOCOL.agent]: https://tools.ietf.org/html/draft-miller-ssh-agent-00
 package agent // import "golang.org/x/crypto/ssh/agent"
 
 import (
@@ -25,7 +26,6 @@ import (
 	"math/big"
 	"sync"
 
-	"crypto"
 	"golang.org/x/crypto/ed25519"
 	"golang.org/x/crypto/ssh"
 )
@@ -771,19 +771,26 @@ func (s *agentKeyringSigner) Sign(rand io.Reader, data []byte) (*ssh.Signature,
 	return s.agent.Sign(s.pub, data)
 }
 
-func (s *agentKeyringSigner) SignWithOpts(rand io.Reader, data []byte, opts crypto.SignerOpts) (*ssh.Signature, error) {
+func (s *agentKeyringSigner) SignWithAlgorithm(rand io.Reader, data []byte, algorithm string) (*ssh.Signature, error) {
+	if algorithm == "" || algorithm == s.pub.Type() {
+		return s.Sign(rand, data)
+	}
+
 	var flags SignatureFlags
-	if opts != nil {
-		switch opts.HashFunc() {
-		case crypto.SHA256:
-			flags = SignatureFlagRsaSha256
-		case crypto.SHA512:
-			flags = SignatureFlagRsaSha512
-		}
+	switch algorithm {
+	case ssh.KeyAlgoRSASHA256:
+		flags = SignatureFlagRsaSha256
+	case ssh.KeyAlgoRSASHA512:
+		flags = SignatureFlagRsaSha512
+	default:
+		return nil, fmt.Errorf("agent: unsupported algorithm %q", algorithm)
 	}
+
 	return s.agent.SignWithFlags(s.pub, data, flags)
 }
 
+var _ ssh.AlgorithmSigner = &agentKeyringSigner{}
+
 // Calls an extension method. It is up to the agent implementation as to whether or not
 // any particular extension is supported and may always return an error. Because the
 // type of the response is up to the implementation, this returns the bytes of the
diff --git a/vendor/golang.org/x/crypto/ssh/agent/keyring.go b/vendor/golang.org/x/crypto/ssh/agent/keyring.go
index c9d979430..21bfa870f 100644
--- a/vendor/golang.org/x/crypto/ssh/agent/keyring.go
+++ b/vendor/golang.org/x/crypto/ssh/agent/keyring.go
@@ -113,7 +113,7 @@ func (r *keyring) Unlock(passphrase []byte) error {
 
 // expireKeysLocked removes expired keys from the keyring. If a key was added
 // with a lifetimesecs contraint and seconds >= lifetimesecs seconds have
-// ellapsed, it is removed. The caller *must* be holding the keyring mutex.
+// elapsed, it is removed. The caller *must* be holding the keyring mutex.
 func (r *keyring) expireKeysLocked() {
 	for _, k := range r.keys {
 		if k.expire != nil && time.Now().After(*k.expire) {
@@ -205,9 +205,9 @@ func (r *keyring) SignWithFlags(key ssh.PublicKey, data []byte, flags SignatureF
 					var algorithm string
 					switch flags {
 					case SignatureFlagRsaSha256:
-						algorithm = ssh.SigAlgoRSASHA2256
+						algorithm = ssh.KeyAlgoRSASHA256
 					case SignatureFlagRsaSha512:
-						algorithm = ssh.SigAlgoRSASHA2512
+						algorithm = ssh.KeyAlgoRSASHA512
 					default:
 						return nil, fmt.Errorf("agent: unsupported signature flags: %d", flags)
 					}
diff --git a/vendor/golang.org/x/crypto/ssh/certs.go b/vendor/golang.org/x/crypto/ssh/certs.go
index 6605bf644..a69e22491 100644
--- a/vendor/golang.org/x/crypto/ssh/certs.go
+++ b/vendor/golang.org/x/crypto/ssh/certs.go
@@ -14,8 +14,10 @@ import (
 	"time"
 )
 
-// These constants from [PROTOCOL.certkeys] represent the key algorithm names
-// for certificate types supported by this package.
+// Certificate algorithm names from [PROTOCOL.certkeys]. These values can appear
+// in Certificate.Type, PublicKey.Type, and ClientConfig.HostKeyAlgorithms.
+// Unlike key algorithm names, these are not passed to AlgorithmSigner and don't
+// appear in the Signature.Format field.
 const (
 	CertAlgoRSAv01        = "ssh-rsa-cert-v01@openssh.com"
 	CertAlgoDSAv01        = "ssh-dss-cert-v01@openssh.com"
@@ -25,14 +27,21 @@ const (
 	CertAlgoSKECDSA256v01 = "sk-ecdsa-sha2-nistp256-cert-v01@openssh.com"
 	CertAlgoED25519v01    = "ssh-ed25519-cert-v01@openssh.com"
 	CertAlgoSKED25519v01  = "sk-ssh-ed25519-cert-v01@openssh.com"
+
+	// CertAlgoRSASHA256v01 and CertAlgoRSASHA512v01 can't appear as a
+	// Certificate.Type (or PublicKey.Type), but only in
+	// ClientConfig.HostKeyAlgorithms.
+	CertAlgoRSASHA256v01 = "rsa-sha2-256-cert-v01@openssh.com"
+	CertAlgoRSASHA512v01 = "rsa-sha2-512-cert-v01@openssh.com"
 )
 
-// These constants from [PROTOCOL.certkeys] represent additional signature
-// algorithm names for certificate types supported by this package.
 const (
-	CertSigAlgoRSAv01        = "ssh-rsa-cert-v01@openssh.com"
-	CertSigAlgoRSASHA2256v01 = "rsa-sha2-256-cert-v01@openssh.com"
-	CertSigAlgoRSASHA2512v01 = "rsa-sha2-512-cert-v01@openssh.com"
+	// Deprecated: use CertAlgoRSAv01.
+	CertSigAlgoRSAv01 = CertAlgoRSAv01
+	// Deprecated: use CertAlgoRSASHA256v01.
+	CertSigAlgoRSASHA2256v01 = CertAlgoRSASHA256v01
+	// Deprecated: use CertAlgoRSASHA512v01.
+	CertSigAlgoRSASHA2512v01 = CertAlgoRSASHA512v01
 )
 
 // Certificate types distinguish between host and user
@@ -431,10 +440,14 @@ func (c *Certificate) SignCert(rand io.Reader, authority Signer) error {
 	}
 	c.SignatureKey = authority.PublicKey()
 
-	if v, ok := authority.(AlgorithmSigner); ok {
-		if v.PublicKey().Type() == KeyAlgoRSA {
-			authority = &rsaSigner{v, SigAlgoRSASHA2512}
+	// Default to KeyAlgoRSASHA512 for ssh-rsa signers.
+	if v, ok := authority.(AlgorithmSigner); ok && v.PublicKey().Type() == KeyAlgoRSA {
+		sig, err := v.SignWithAlgorithm(rand, c.bytesForSigning(), KeyAlgoRSASHA512)
+		if err != nil {
+			return err
 		}
+		c.Signature = sig
+		return nil
 	}
 
 	sig, err := authority.Sign(rand, c.bytesForSigning())
@@ -445,32 +458,40 @@ func (c *Certificate) SignCert(rand io.Reader, authority Signer) error {
 	return nil
 }
 
-// certAlgoNames includes a mapping from signature algorithms to the
-// corresponding certificate signature algorithm. When a key type (such
-// as ED25516) is associated with only one algorithm, the KeyAlgo
-// constant is used instead of the SigAlgo.
-var certAlgoNames = map[string]string{
-	SigAlgoRSA:        CertSigAlgoRSAv01,
-	SigAlgoRSASHA2256: CertSigAlgoRSASHA2256v01,
-	SigAlgoRSASHA2512: CertSigAlgoRSASHA2512v01,
-	KeyAlgoDSA:        CertAlgoDSAv01,
-	KeyAlgoECDSA256:   CertAlgoECDSA256v01,
-	KeyAlgoECDSA384:   CertAlgoECDSA384v01,
-	KeyAlgoECDSA521:   CertAlgoECDSA521v01,
-	KeyAlgoSKECDSA256: CertAlgoSKECDSA256v01,
-	KeyAlgoED25519:    CertAlgoED25519v01,
-	KeyAlgoSKED25519:  CertAlgoSKED25519v01,
+// certKeyAlgoNames is a mapping from known certificate algorithm names to the
+// corresponding public key signature algorithm.
+var certKeyAlgoNames = map[string]string{
+	CertAlgoRSAv01:        KeyAlgoRSA,
+	CertAlgoRSASHA256v01:  KeyAlgoRSASHA256,
+	CertAlgoRSASHA512v01:  KeyAlgoRSASHA512,
+	CertAlgoDSAv01:        KeyAlgoDSA,
+	CertAlgoECDSA256v01:   KeyAlgoECDSA256,
+	CertAlgoECDSA384v01:   KeyAlgoECDSA384,
+	CertAlgoECDSA521v01:   KeyAlgoECDSA521,
+	CertAlgoSKECDSA256v01: KeyAlgoSKECDSA256,
+	CertAlgoED25519v01:    KeyAlgoED25519,
+	CertAlgoSKED25519v01:  KeyAlgoSKED25519,
+}
+
+// underlyingAlgo returns the signature algorithm associated with algo (which is
+// an advertised or negotiated public key or host key algorithm). These are
+// usually the same, except for certificate algorithms.
+func underlyingAlgo(algo string) string {
+	if a, ok := certKeyAlgoNames[algo]; ok {
+		return a
+	}
+	return algo
 }
 
-// certToPrivAlgo returns the underlying algorithm for a certificate algorithm.
-// Panics if a non-certificate algorithm is passed.
-func certToPrivAlgo(algo string) string {
-	for privAlgo, pubAlgo := range certAlgoNames {
-		if pubAlgo == algo {
-			return privAlgo
+// certificateAlgo returns the certificate algorithms that uses the provided
+// underlying signature algorithm.
+func certificateAlgo(algo string) (certAlgo string, ok bool) {
+	for certName, algoName := range certKeyAlgoNames {
+		if algoName == algo {
+			return certName, true
 		}
 	}
-	panic("unknown cert algorithm")
+	return "", false
 }
 
 func (cert *Certificate) bytesForSigning() []byte {
@@ -514,13 +535,13 @@ func (c *Certificate) Marshal() []byte {
 	return result
 }
 
-// Type returns the key name. It is part of the PublicKey interface.
+// Type returns the certificate algorithm name. It is part of the PublicKey interface.
 func (c *Certificate) Type() string {
-	algo, ok := certAlgoNames[c.Key.Type()]
+	certName, ok := certificateAlgo(c.Key.Type())
 	if !ok {
-		panic("unknown cert key type " + c.Key.Type())
+		panic("unknown certificate type for key type " + c.Key.Type())
 	}
-	return algo
+	return certName
 }
 
 // Verify verifies a signature against the certificate's public
diff --git a/vendor/golang.org/x/crypto/ssh/cipher.go b/vendor/golang.org/x/crypto/ssh/cipher.go
index f8bdf4984..770e8a663 100644
--- a/vendor/golang.org/x/crypto/ssh/cipher.go
+++ b/vendor/golang.org/x/crypto/ssh/cipher.go
@@ -640,7 +640,7 @@ const chacha20Poly1305ID = "chacha20-poly1305@openssh.com"
 // chacha20Poly1305Cipher implements the chacha20-poly1305@openssh.com
 // AEAD, which is described here:
 //
-//   https://tools.ietf.org/html/draft-josefsson-ssh-chacha20-poly1305-openssh-00
+//	https://tools.ietf.org/html/draft-josefsson-ssh-chacha20-poly1305-openssh-00
 //
 // the methods here also implement padding, which RFC4253 Section 6
 // also requires of stream ciphers.
diff --git a/vendor/golang.org/x/crypto/ssh/client.go b/vendor/golang.org/x/crypto/ssh/client.go
index ba8621a89..bdc356cbd 100644
--- a/vendor/golang.org/x/crypto/ssh/client.go
+++ b/vendor/golang.org/x/crypto/ssh/client.go
@@ -113,25 +113,16 @@ func (c *connection) clientHandshake(dialAddress string, config *ClientConfig) e
 	return c.clientAuthenticate(config)
 }
 
-// verifyHostKeySignature verifies the host key obtained in the key
-// exchange.
+// verifyHostKeySignature verifies the host key obtained in the key exchange.
+// algo is the negotiated algorithm, and may be a certificate type.
 func verifyHostKeySignature(hostKey PublicKey, algo string, result *kexResult) error {
 	sig, rest, ok := parseSignatureBody(result.Signature)
 	if len(rest) > 0 || !ok {
 		return errors.New("ssh: signature parse error")
 	}
 
-	// For keys, underlyingAlgo is exactly algo. For certificates,
-	// we have to look up the underlying key algorithm that SSH
-	// uses to evaluate signatures.
-	underlyingAlgo := algo
-	for sigAlgo, certAlgo := range certAlgoNames {
-		if certAlgo == algo {
-			underlyingAlgo = sigAlgo
-		}
-	}
-	if sig.Format != underlyingAlgo {
-		return fmt.Errorf("ssh: invalid signature algorithm %q, expected %q", sig.Format, underlyingAlgo)
+	if a := underlyingAlgo(algo); sig.Format != a {
+		return fmt.Errorf("ssh: invalid signature algorithm %q, expected %q", sig.Format, a)
 	}
 
 	return hostKey.Verify(result.H, sig)
@@ -237,11 +228,11 @@ type ClientConfig struct {
 	// be used for the connection. If empty, a reasonable default is used.
 	ClientVersion string
 
-	// HostKeyAlgorithms lists the key types that the client will
-	// accept from the server as host key, in order of
+	// HostKeyAlgorithms lists the public key algorithms that the client will
+	// accept from the server for host key authentication, in order of
 	// preference. If empty, a reasonable default is used. Any
-	// string returned from PublicKey.Type method may be used, or
-	// any of the CertAlgoXxxx and KeyAlgoXxxx constants.
+	// string returned from a PublicKey.Type method may be used, or
+	// any of the CertAlgo and KeyAlgo constants.
 	HostKeyAlgorithms []string
 
 	// Timeout is the maximum amount of time for the TCP connection to establish.
diff --git a/vendor/golang.org/x/crypto/ssh/client_auth.go b/vendor/golang.org/x/crypto/ssh/client_auth.go
index c611aeb68..409b5ea1d 100644
--- a/vendor/golang.org/x/crypto/ssh/client_auth.go
+++ b/vendor/golang.org/x/crypto/ssh/client_auth.go
@@ -9,6 +9,7 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"strings"
 )
 
 type authResult int
@@ -29,6 +30,33 @@ func (c *connection) clientAuthenticate(config *ClientConfig) error {
 	if err != nil {
 		return err
 	}
+	// The server may choose to send a SSH_MSG_EXT_INFO at this point (if we
+	// advertised willingness to receive one, which we always do) or not. See
+	// RFC 8308, Section 2.4.
+	extensions := make(map[string][]byte)
+	if len(packet) > 0 && packet[0] == msgExtInfo {
+		var extInfo extInfoMsg
+		if err := Unmarshal(packet, &extInfo); err != nil {
+			return err
+		}
+		payload := extInfo.Payload
+		for i := uint32(0); i < extInfo.NumExtensions; i++ {
+			name, rest, ok := parseString(payload)
+			if !ok {
+				return parseError(msgExtInfo)
+			}
+			value, rest, ok := parseString(rest)
+			if !ok {
+				return parseError(msgExtInfo)
+			}
+			extensions[string(name)] = value
+			payload = rest
+		}
+		packet, err = c.transport.readPacket()
+		if err != nil {
+			return err
+		}
+	}
 	var serviceAccept serviceAcceptMsg
 	if err := Unmarshal(packet, &serviceAccept); err != nil {
 		return err
@@ -41,7 +69,7 @@ func (c *connection) clientAuthenticate(config *ClientConfig) error {
 
 	sessionID := c.transport.getSessionID()
 	for auth := AuthMethod(new(noneAuth)); auth != nil; {
-		ok, methods, err := auth.auth(sessionID, config.User, c.transport, config.Rand)
+		ok, methods, err := auth.auth(sessionID, config.User, c.transport, config.Rand, extensions)
 		if err != nil {
 			return err
 		}
@@ -93,7 +121,7 @@ type AuthMethod interface {
 	// If authentication is not successful, a []string of alternative
 	// method names is returned. If the slice is nil, it will be ignored
 	// and the previous set of possible methods will be reused.
-	auth(session []byte, user string, p packetConn, rand io.Reader) (authResult, []string, error)
+	auth(session []byte, user string, p packetConn, rand io.Reader, extensions map[string][]byte) (authResult, []string, error)
 
 	// method returns the RFC 4252 method name.
 	method() string
@@ -102,7 +130,7 @@ type AuthMethod interface {
 // "none" authentication, RFC 4252 section 5.2.
 type noneAuth int
 
-func (n *noneAuth) auth(session []byte, user string, c packetConn, rand io.Reader) (authResult, []string, error) {
+func (n *noneAuth) auth(session []byte, user string, c packetConn, rand io.Reader, _ map[string][]byte) (authResult, []string, error) {
 	if err := c.writePacket(Marshal(&userAuthRequestMsg{
 		User:    user,
 		Service: serviceSSH,
@@ -122,7 +150,7 @@ func (n *noneAuth) method() string {
 // a function call, e.g. by prompting the user.
 type passwordCallback func() (password string, err error)
 
-func (cb passwordCallback) auth(session []byte, user string, c packetConn, rand io.Reader) (authResult, []string, error) {
+func (cb passwordCallback) auth(session []byte, user string, c packetConn, rand io.Reader, _ map[string][]byte) (authResult, []string, error) {
 	type passwordAuthMsg struct {
 		User     string `sshtype:"50"`
 		Service  string
@@ -189,7 +217,46 @@ func (cb publicKeyCallback) method() string {
 	return "publickey"
 }
 
-func (cb publicKeyCallback) auth(session []byte, user string, c packetConn, rand io.Reader) (authResult, []string, error) {
+func pickSignatureAlgorithm(signer Signer, extensions map[string][]byte) (as AlgorithmSigner, algo string) {
+	keyFormat := signer.PublicKey().Type()
+
+	// Like in sendKexInit, if the public key implements AlgorithmSigner we
+	// assume it supports all algorithms, otherwise only the key format one.
+	as, ok := signer.(AlgorithmSigner)
+	if !ok {
+		return algorithmSignerWrapper{signer}, keyFormat
+	}
+
+	extPayload, ok := extensions["server-sig-algs"]
+	if !ok {
+		// If there is no "server-sig-algs" extension, fall back to the key
+		// format algorithm.
+		return as, keyFormat
+	}
+
+	// The server-sig-algs extension only carries underlying signature
+	// algorithm, but we are trying to select a protocol-level public key
+	// algorithm, which might be a certificate type. Extend the list of server
+	// supported algorithms to include the corresponding certificate algorithms.
+	serverAlgos := strings.Split(string(extPayload), ",")
+	for _, algo := range serverAlgos {
+		if certAlgo, ok := certificateAlgo(algo); ok {
+			serverAlgos = append(serverAlgos, certAlgo)
+		}
+	}
+
+	keyAlgos := algorithmsForKeyFormat(keyFormat)
+	algo, err := findCommon("public key signature algorithm", keyAlgos, serverAlgos)
+	if err != nil {
+		// If there is no overlap, try the key anyway with the key format
+		// algorithm, to support servers that fail to list all supported
+		// algorithms.
+		return as, keyFormat
+	}
+	return as, algo
+}
+
+func (cb publicKeyCallback) auth(session []byte, user string, c packetConn, rand io.Reader, extensions map[string][]byte) (authResult, []string, error) {
 	// Authentication is performed by sending an enquiry to test if a key is
 	// acceptable to the remote. If the key is acceptable, the client will
 	// attempt to authenticate with the valid key.  If not the client will repeat
@@ -201,7 +268,10 @@ func (cb publicKeyCallback) auth(session []byte, user string, c packetConn, rand
 	}
 	var methods []string
 	for _, signer := range signers {
-		ok, err := validateKey(signer.PublicKey(), user, c)
+		pub := signer.PublicKey()
+		as, algo := pickSignatureAlgorithm(signer, extensions)
+
+		ok, err := validateKey(pub, algo, user, c)
 		if err != nil {
 			return authFailure, nil, err
 		}
@@ -209,13 +279,13 @@ func (cb publicKeyCallback) auth(session []byte, user string, c packetConn, rand
 			continue
 		}
 
-		pub := signer.PublicKey()
 		pubKey := pub.Marshal()
-		sign, err := signer.Sign(rand, buildDataSignedForAuth(session, userAuthRequestMsg{
+		data := buildDataSignedForAuth(session, userAuthRequestMsg{
 			User:    user,
 			Service: serviceSSH,
 			Method:  cb.method(),
-		}, []byte(pub.Type()), pubKey))
+		}, algo, pubKey)
+		sign, err := as.SignWithAlgorithm(rand, data, underlyingAlgo(algo))
 		if err != nil {
 			return authFailure, nil, err
 		}
@@ -229,7 +299,7 @@ func (cb publicKeyCallback) auth(session []byte, user string, c packetConn, rand
 			Service:  serviceSSH,
 			Method:   cb.method(),
 			HasSig:   true,
-			Algoname: pub.Type(),
+			Algoname: algo,
 			PubKey:   pubKey,
 			Sig:      sig,
 		}
@@ -266,26 +336,25 @@ func containsMethod(methods []string, method string) bool {
 }
 
 // validateKey validates the key provided is acceptable to the server.
-func validateKey(key PublicKey, user string, c packetConn) (bool, error) {
+func validateKey(key PublicKey, algo string, user string, c packetConn) (bool, error) {
 	pubKey := key.Marshal()
 	msg := publickeyAuthMsg{
 		User:     user,
 		Service:  serviceSSH,
 		Method:   "publickey",
 		HasSig:   false,
-		Algoname: key.Type(),
+		Algoname: algo,
 		PubKey:   pubKey,
 	}
 	if err := c.writePacket(Marshal(&msg)); err != nil {
 		return false, err
 	}
 
-	return confirmKeyAck(key, c)
+	return confirmKeyAck(key, algo, c)
 }
 
-func confirmKeyAck(key PublicKey, c packetConn) (bool, error) {
+func confirmKeyAck(key PublicKey, algo string, c packetConn) (bool, error) {
 	pubKey := key.Marshal()
-	algoname := key.Type()
 
 	for {
 		packet, err := c.readPacket()
@@ -302,14 +371,14 @@ func confirmKeyAck(key PublicKey, c packetConn) (bool, error) {
 			if err := Unmarshal(packet, &msg); err != nil {
 				return false, err
 			}
-			if msg.Algo != algoname || !bytes.Equal(msg.PubKey, pubKey) {
+			if msg.Algo != algo || !bytes.Equal(msg.PubKey, pubKey) {
 				return false, nil
 			}
 			return true, nil
 		case msgUserAuthFailure:
 			return false, nil
 		default:
-			return false, unexpectedMessageError(msgUserAuthSuccess, packet[0])
+			return false, unexpectedMessageError(msgUserAuthPubKeyOk, packet[0])
 		}
 	}
 }
@@ -330,6 +399,7 @@ func PublicKeysCallback(getSigners func() (signers []Signer, err error)) AuthMet
 // along with a list of remaining authentication methods to try next and
 // an error if an unexpected response was received.
 func handleAuthResponse(c packetConn) (authResult, []string, error) {
+	gotMsgExtInfo := false
 	for {
 		packet, err := c.readPacket()
 		if err != nil {
@@ -341,6 +411,12 @@ func handleAuthResponse(c packetConn) (authResult, []string, error) {
 			if err := handleBannerResponse(c, packet); err != nil {
 				return authFailure, nil, err
 			}
+		case msgExtInfo:
+			// Ignore post-authentication RFC 8308 extensions, once.
+			if gotMsgExtInfo {
+				return authFailure, nil, unexpectedMessageError(msgUserAuthSuccess, packet[0])
+			}
+			gotMsgExtInfo = true
 		case msgUserAuthFailure:
 			var msg userAuthFailureMsg
 			if err := Unmarshal(packet, &msg); err != nil {
@@ -380,10 +456,10 @@ func handleBannerResponse(c packetConn, packet []byte) error {
 // disabling echoing (e.g. for passwords), and return all the answers.
 // Challenge may be called multiple times in a single session. After
 // successful authentication, the server may send a challenge with no
-// questions, for which the user and instruction messages should be
+// questions, for which the name and instruction messages should be
 // printed.  RFC 4256 section 3.3 details how the UI should behave for
 // both CLI and GUI environments.
-type KeyboardInteractiveChallenge func(user, instruction string, questions []string, echos []bool) (answers []string, err error)
+type KeyboardInteractiveChallenge func(name, instruction string, questions []string, echos []bool) (answers []string, err error)
 
 // KeyboardInteractive returns an AuthMethod using a prompt/response
 // sequence controlled by the server.
@@ -395,7 +471,7 @@ func (cb KeyboardInteractiveChallenge) method() string {
 	return "keyboard-interactive"
 }
 
-func (cb KeyboardInteractiveChallenge) auth(session []byte, user string, c packetConn, rand io.Reader) (authResult, []string, error) {
+func (cb KeyboardInteractiveChallenge) auth(session []byte, user string, c packetConn, rand io.Reader, _ map[string][]byte) (authResult, []string, error) {
 	type initiateMsg struct {
 		User       string `sshtype:"50"`
 		Service    string
@@ -412,6 +488,7 @@ func (cb KeyboardInteractiveChallenge) auth(session []byte, user string, c packe
 		return authFailure, nil, err
 	}
 
+	gotMsgExtInfo := false
 	for {
 		packet, err := c.readPacket()
 		if err != nil {
@@ -425,6 +502,13 @@ func (cb KeyboardInteractiveChallenge) auth(session []byte, user string, c packe
 				return authFailure, nil, err
 			}
 			continue
+		case msgExtInfo:
+			// Ignore post-authentication RFC 8308 extensions, once.
+			if gotMsgExtInfo {
+				return authFailure, nil, unexpectedMessageError(msgUserAuthInfoRequest, packet[0])
+			}
+			gotMsgExtInfo = true
+			continue
 		case msgUserAuthInfoRequest:
 			// OK
 		case msgUserAuthFailure:
@@ -465,7 +549,7 @@ func (cb KeyboardInteractiveChallenge) auth(session []byte, user string, c packe
 			return authFailure, nil, errors.New("ssh: extra data following keyboard-interactive pairs")
 		}
 
-		answers, err := cb(msg.User, msg.Instruction, prompts, echos)
+		answers, err := cb(msg.Name, msg.Instruction, prompts, echos)
 		if err != nil {
 			return authFailure, nil, err
 		}
@@ -497,9 +581,9 @@ type retryableAuthMethod struct {
 	maxTries   int
 }
 
-func (r *retryableAuthMethod) auth(session []byte, user string, c packetConn, rand io.Reader) (ok authResult, methods []string, err error) {
+func (r *retryableAuthMethod) auth(session []byte, user string, c packetConn, rand io.Reader, extensions map[string][]byte) (ok authResult, methods []string, err error) {
 	for i := 0; r.maxTries <= 0 || i < r.maxTries; i++ {
-		ok, methods, err = r.authMethod.auth(session, user, c, rand)
+		ok, methods, err = r.authMethod.auth(session, user, c, rand, extensions)
 		if ok != authFailure || err != nil { // either success, partial success or error terminate
 			return ok, methods, err
 		}
@@ -542,7 +626,7 @@ type gssAPIWithMICCallback struct {
 	target       string
 }
 
-func (g *gssAPIWithMICCallback) auth(session []byte, user string, c packetConn, rand io.Reader) (authResult, []string, error) {
+func (g *gssAPIWithMICCallback) auth(session []byte, user string, c packetConn, rand io.Reader, _ map[string][]byte) (authResult, []string, error) {
 	m := &userAuthRequestMsg{
 		User:    user,
 		Service: serviceSSH,
diff --git a/vendor/golang.org/x/crypto/ssh/common.go b/vendor/golang.org/x/crypto/ssh/common.go
index 5ae227574..2a47a61de 100644
--- a/vendor/golang.org/x/crypto/ssh/common.go
+++ b/vendor/golang.org/x/crypto/ssh/common.go
@@ -44,11 +44,11 @@ var preferredCiphers = []string{
 // supportedKexAlgos specifies the supported key-exchange algorithms in
 // preference order.
 var supportedKexAlgos = []string{
-	kexAlgoCurve25519SHA256,
+	kexAlgoCurve25519SHA256, kexAlgoCurve25519SHA256LibSSH,
 	// P384 and P521 are not constant-time yet, but since we don't
 	// reuse ephemeral keys, using them for ECDH should be OK.
 	kexAlgoECDH256, kexAlgoECDH384, kexAlgoECDH521,
-	kexAlgoDH14SHA1, kexAlgoDH1SHA1,
+	kexAlgoDH14SHA256, kexAlgoDH14SHA1, kexAlgoDH1SHA1,
 }
 
 // serverForbiddenKexAlgos contains key exchange algorithms, that are forbidden
@@ -61,21 +61,21 @@ var serverForbiddenKexAlgos = map[string]struct{}{
 // preferredKexAlgos specifies the default preference for key-exchange algorithms
 // in preference order.
 var preferredKexAlgos = []string{
-	kexAlgoCurve25519SHA256,
+	kexAlgoCurve25519SHA256, kexAlgoCurve25519SHA256LibSSH,
 	kexAlgoECDH256, kexAlgoECDH384, kexAlgoECDH521,
-	kexAlgoDH14SHA1,
+	kexAlgoDH14SHA256, kexAlgoDH14SHA1,
 }
 
 // supportedHostKeyAlgos specifies the supported host-key algorithms (i.e. methods
 // of authenticating servers) in preference order.
 var supportedHostKeyAlgos = []string{
-	CertSigAlgoRSASHA2512v01, CertSigAlgoRSASHA2256v01,
-	CertSigAlgoRSAv01, CertAlgoDSAv01, CertAlgoECDSA256v01,
+	CertAlgoRSASHA512v01, CertAlgoRSASHA256v01,
+	CertAlgoRSAv01, CertAlgoDSAv01, CertAlgoECDSA256v01,
 	CertAlgoECDSA384v01, CertAlgoECDSA521v01, CertAlgoED25519v01,
 
 	KeyAlgoECDSA256, KeyAlgoECDSA384, KeyAlgoECDSA521,
-	SigAlgoRSASHA2512, SigAlgoRSASHA2256,
-	SigAlgoRSA, KeyAlgoDSA,
+	KeyAlgoRSASHA512, KeyAlgoRSASHA256,
+	KeyAlgoRSA, KeyAlgoDSA,
 
 	KeyAlgoED25519,
 }
@@ -89,23 +89,33 @@ var supportedMACs = []string{
 
 var supportedCompressions = []string{compressionNone}
 
-// hashFuncs keeps the mapping of supported algorithms to their respective
-// hashes needed for signature verification.
+// hashFuncs keeps the mapping of supported signature algorithms to their
+// respective hashes needed for signing and verification.
 var hashFuncs = map[string]crypto.Hash{
-	SigAlgoRSA:               crypto.SHA1,
-	SigAlgoRSASHA2256:        crypto.SHA256,
-	SigAlgoRSASHA2512:        crypto.SHA512,
-	KeyAlgoDSA:               crypto.SHA1,
-	KeyAlgoECDSA256:          crypto.SHA256,
-	KeyAlgoECDSA384:          crypto.SHA384,
-	KeyAlgoECDSA521:          crypto.SHA512,
-	CertSigAlgoRSAv01:        crypto.SHA1,
-	CertSigAlgoRSASHA2256v01: crypto.SHA256,
-	CertSigAlgoRSASHA2512v01: crypto.SHA512,
-	CertAlgoDSAv01:           crypto.SHA1,
-	CertAlgoECDSA256v01:      crypto.SHA256,
-	CertAlgoECDSA384v01:      crypto.SHA384,
-	CertAlgoECDSA521v01:      crypto.SHA512,
+	KeyAlgoRSA:       crypto.SHA1,
+	KeyAlgoRSASHA256: crypto.SHA256,
+	KeyAlgoRSASHA512: crypto.SHA512,
+	KeyAlgoDSA:       crypto.SHA1,
+	KeyAlgoECDSA256:  crypto.SHA256,
+	KeyAlgoECDSA384:  crypto.SHA384,
+	KeyAlgoECDSA521:  crypto.SHA512,
+	// KeyAlgoED25519 doesn't pre-hash.
+	KeyAlgoSKECDSA256: crypto.SHA256,
+	KeyAlgoSKED25519:  crypto.SHA256,
+}
+
+// algorithmsForKeyFormat returns the supported signature algorithms for a given
+// public key format (PublicKey.Type), in order of preference. See RFC 8332,
+// Section 2. See also the note in sendKexInit on backwards compatibility.
+func algorithmsForKeyFormat(keyFormat string) []string {
+	switch keyFormat {
+	case KeyAlgoRSA:
+		return []string{KeyAlgoRSASHA256, KeyAlgoRSASHA512, KeyAlgoRSA}
+	case CertAlgoRSAv01:
+		return []string{CertAlgoRSASHA256v01, CertAlgoRSASHA512v01, CertAlgoRSAv01}
+	default:
+		return []string{keyFormat}
+	}
 }
 
 // unexpectedMessageError results when the SSH message that we received didn't
@@ -152,6 +162,11 @@ func (a *directionAlgorithms) rekeyBytes() int64 {
 	return 1 << 30
 }
 
+var aeadCiphers = map[string]bool{
+	gcmCipherID:        true,
+	chacha20Poly1305ID: true,
+}
+
 type algorithms struct {
 	kex     string
 	hostKey string
@@ -187,14 +202,18 @@ func findAgreedAlgorithms(isClient bool, clientKexInit, serverKexInit *kexInitMs
 		return
 	}
 
-	ctos.MAC, err = findCommon("client to server MAC", clientKexInit.MACsClientServer, serverKexInit.MACsClientServer)
-	if err != nil {
-		return
+	if !aeadCiphers[ctos.Cipher] {
+		ctos.MAC, err = findCommon("client to server MAC", clientKexInit.MACsClientServer, serverKexInit.MACsClientServer)
+		if err != nil {
+			return
+		}
 	}
 
-	stoc.MAC, err = findCommon("server to client MAC", clientKexInit.MACsServerClient, serverKexInit.MACsServerClient)
-	if err != nil {
-		return
+	if !aeadCiphers[stoc.Cipher] {
+		stoc.MAC, err = findCommon("server to client MAC", clientKexInit.MACsServerClient, serverKexInit.MACsServerClient)
+		if err != nil {
+			return
+		}
 	}
 
 	ctos.Compression, err = findCommon("client to server compression", clientKexInit.CompressionClientServer, serverKexInit.CompressionClientServer)
@@ -278,8 +297,9 @@ func (c *Config) SetDefaults() {
 }
 
 // buildDataSignedForAuth returns the data that is signed in order to prove
-// possession of a private key. See RFC 4252, section 7.
-func buildDataSignedForAuth(sessionID []byte, req userAuthRequestMsg, algo, pubKey []byte) []byte {
+// possession of a private key. See RFC 4252, section 7. algo is the advertised
+// algorithm, and may be a certificate type.
+func buildDataSignedForAuth(sessionID []byte, req userAuthRequestMsg, algo string, pubKey []byte) []byte {
 	data := struct {
 		Session []byte
 		Type    byte
@@ -287,7 +307,7 @@ func buildDataSignedForAuth(sessionID []byte, req userAuthRequestMsg, algo, pubK
 		Service string
 		Method  string
 		Sign    bool
-		Algo    []byte
+		Algo    string
 		PubKey  []byte
 	}{
 		sessionID,
diff --git a/vendor/golang.org/x/crypto/ssh/doc.go b/vendor/golang.org/x/crypto/ssh/doc.go
index 67b7322c0..f6bff60dc 100644
--- a/vendor/golang.org/x/crypto/ssh/doc.go
+++ b/vendor/golang.org/x/crypto/ssh/doc.go
@@ -12,8 +12,9 @@ the multiplexed nature of SSH is exposed to users that wish to support
 others.
 
 References:
-  [PROTOCOL.certkeys]: http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/PROTOCOL.certkeys?rev=HEAD
-  [SSH-PARAMETERS]:    http://www.iana.org/assignments/ssh-parameters/ssh-parameters.xml#ssh-parameters-1
+
+	[PROTOCOL.certkeys]: http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/PROTOCOL.certkeys?rev=HEAD
+	[SSH-PARAMETERS]:    http://www.iana.org/assignments/ssh-parameters/ssh-parameters.xml#ssh-parameters-1
 
 This package does not fall under the stability promise of the Go language itself,
 so its API may be changed when pressing needs arise.
diff --git a/vendor/golang.org/x/crypto/ssh/handshake.go b/vendor/golang.org/x/crypto/ssh/handshake.go
index 05ad49c36..653dc4d2c 100644
--- a/vendor/golang.org/x/crypto/ssh/handshake.go
+++ b/vendor/golang.org/x/crypto/ssh/handshake.go
@@ -455,21 +455,38 @@ func (t *handshakeTransport) sendKexInit() error {
 	}
 	io.ReadFull(rand.Reader, msg.Cookie[:])
 
-	if len(t.hostKeys) > 0 {
+	isServer := len(t.hostKeys) > 0
+	if isServer {
 		for _, k := range t.hostKeys {
-			algo := k.PublicKey().Type()
-			switch algo {
-			case KeyAlgoRSA:
-				msg.ServerHostKeyAlgos = append(msg.ServerHostKeyAlgos, []string{SigAlgoRSASHA2512, SigAlgoRSASHA2256, SigAlgoRSA}...)
-			case CertAlgoRSAv01:
-				msg.ServerHostKeyAlgos = append(msg.ServerHostKeyAlgos, []string{CertSigAlgoRSASHA2512v01, CertSigAlgoRSASHA2256v01, CertSigAlgoRSAv01}...)
-			default:
-				msg.ServerHostKeyAlgos = append(msg.ServerHostKeyAlgos, algo)
+			// If k is an AlgorithmSigner, presume it supports all signature algorithms
+			// associated with the key format. (Ideally AlgorithmSigner would have a
+			// method to advertise supported algorithms, but it doesn't. This means that
+			// adding support for a new algorithm is a breaking change, as we will
+			// immediately negotiate it even if existing implementations don't support
+			// it. If that ever happens, we'll have to figure something out.)
+			// If k is not an AlgorithmSigner, we can only assume it only supports the
+			// algorithms that matches the key format. (This means that Sign can't pick
+			// a different default.)
+			keyFormat := k.PublicKey().Type()
+			if _, ok := k.(AlgorithmSigner); ok {
+				msg.ServerHostKeyAlgos = append(msg.ServerHostKeyAlgos, algorithmsForKeyFormat(keyFormat)...)
+			} else {
+				msg.ServerHostKeyAlgos = append(msg.ServerHostKeyAlgos, keyFormat)
 			}
 		}
 	} else {
 		msg.ServerHostKeyAlgos = t.hostKeyAlgorithms
+
+		// As a client we opt in to receiving SSH_MSG_EXT_INFO so we know what
+		// algorithms the server supports for public key authentication. See RFC
+		// 8308, Section 2.1.
+		if firstKeyExchange := t.sessionID == nil; firstKeyExchange {
+			msg.KexAlgos = make([]string, 0, len(t.config.KeyExchanges)+1)
+			msg.KexAlgos = append(msg.KexAlgos, t.config.KeyExchanges...)
+			msg.KexAlgos = append(msg.KexAlgos, "ext-info-c")
+		}
 	}
+
 	packet := Marshal(msg)
 
 	// writePacket destroys the contents, so save a copy.
@@ -589,9 +606,9 @@ func (t *handshakeTransport) enterKeyExchange(otherInitPacket []byte) error {
 
 	var result *kexResult
 	if len(t.hostKeys) > 0 {
-		result, err = t.server(kex, t.algorithms, &magics)
+		result, err = t.server(kex, &magics)
 	} else {
-		result, err = t.client(kex, t.algorithms, &magics)
+		result, err = t.client(kex, &magics)
 	}
 
 	if err != nil {
@@ -618,33 +635,52 @@ func (t *handshakeTransport) enterKeyExchange(otherInitPacket []byte) error {
 	return nil
 }
 
-func (t *handshakeTransport) server(kex kexAlgorithm, algs *algorithms, magics *handshakeMagics) (*kexResult, error) {
-	var hostKey Signer
-	for _, k := range t.hostKeys {
-		kt := k.PublicKey().Type()
-		if kt == algs.hostKey {
-			hostKey = k
-		} else if signer, ok := k.(AlgorithmSigner); ok {
-			// Some signature algorithms don't show up as key types
-			// so we have to manually check for a compatible host key.
-			switch kt {
-			case KeyAlgoRSA:
-				if algs.hostKey == SigAlgoRSASHA2256 || algs.hostKey == SigAlgoRSASHA2512 {
-					hostKey = &rsaSigner{signer, algs.hostKey}
-				}
-			case CertAlgoRSAv01:
-				if algs.hostKey == CertSigAlgoRSASHA2256v01 || algs.hostKey == CertSigAlgoRSASHA2512v01 {
-					hostKey = &rsaSigner{signer, certToPrivAlgo(algs.hostKey)}
-				}
+// algorithmSignerWrapper is an AlgorithmSigner that only supports the default
+// key format algorithm.
+//
+// This is technically a violation of the AlgorithmSigner interface, but it
+// should be unreachable given where we use this. Anyway, at least it returns an
+// error instead of panicing or producing an incorrect signature.
+type algorithmSignerWrapper struct {
+	Signer
+}
+
+func (a algorithmSignerWrapper) SignWithAlgorithm(rand io.Reader, data []byte, algorithm string) (*Signature, error) {
+	if algorithm != underlyingAlgo(a.PublicKey().Type()) {
+		return nil, errors.New("ssh: internal error: algorithmSignerWrapper invoked with non-default algorithm")
+	}
+	return a.Sign(rand, data)
+}
+
+func pickHostKey(hostKeys []Signer, algo string) AlgorithmSigner {
+	for _, k := range hostKeys {
+		if algo == k.PublicKey().Type() {
+			return algorithmSignerWrapper{k}
+		}
+		k, ok := k.(AlgorithmSigner)
+		if !ok {
+			continue
+		}
+		for _, a := range algorithmsForKeyFormat(k.PublicKey().Type()) {
+			if algo == a {
+				return k
 			}
 		}
 	}
+	return nil
+}
+
+func (t *handshakeTransport) server(kex kexAlgorithm, magics *handshakeMagics) (*kexResult, error) {
+	hostKey := pickHostKey(t.hostKeys, t.algorithms.hostKey)
+	if hostKey == nil {
+		return nil, errors.New("ssh: internal error: negotiated unsupported signature type")
+	}
 
-	r, err := kex.Server(t.conn, t.config.Rand, magics, hostKey)
+	r, err := kex.Server(t.conn, t.config.Rand, magics, hostKey, t.algorithms.hostKey)
 	return r, err
 }
 
-func (t *handshakeTransport) client(kex kexAlgorithm, algs *algorithms, magics *handshakeMagics) (*kexResult, error) {
+func (t *handshakeTransport) client(kex kexAlgorithm, magics *handshakeMagics) (*kexResult, error) {
 	result, err := kex.Client(t.conn, t.config.Rand, magics)
 	if err != nil {
 		return nil, err
@@ -655,7 +691,7 @@ func (t *handshakeTransport) client(kex kexAlgorithm, algs *algorithms, magics *
 		return nil, err
 	}
 
-	if err := verifyHostKeySignature(hostKey, algs.hostKey, result); err != nil {
+	if err := verifyHostKeySignature(hostKey, t.algorithms.hostKey, result); err != nil {
 		return nil, err
 	}
 
diff --git a/vendor/golang.org/x/crypto/ssh/kex.go b/vendor/golang.org/x/crypto/ssh/kex.go
index 766e92939..927a90cd4 100644
--- a/vendor/golang.org/x/crypto/ssh/kex.go
+++ b/vendor/golang.org/x/crypto/ssh/kex.go
@@ -20,12 +20,14 @@ import (
 )
 
 const (
-	kexAlgoDH1SHA1          = "diffie-hellman-group1-sha1"
-	kexAlgoDH14SHA1         = "diffie-hellman-group14-sha1"
-	kexAlgoECDH256          = "ecdh-sha2-nistp256"
-	kexAlgoECDH384          = "ecdh-sha2-nistp384"
-	kexAlgoECDH521          = "ecdh-sha2-nistp521"
-	kexAlgoCurve25519SHA256 = "curve25519-sha256@libssh.org"
+	kexAlgoDH1SHA1                = "diffie-hellman-group1-sha1"
+	kexAlgoDH14SHA1               = "diffie-hellman-group14-sha1"
+	kexAlgoDH14SHA256             = "diffie-hellman-group14-sha256"
+	kexAlgoECDH256                = "ecdh-sha2-nistp256"
+	kexAlgoECDH384                = "ecdh-sha2-nistp384"
+	kexAlgoECDH521                = "ecdh-sha2-nistp521"
+	kexAlgoCurve25519SHA256LibSSH = "curve25519-sha256@libssh.org"
+	kexAlgoCurve25519SHA256       = "curve25519-sha256"
 
 	// For the following kex only the client half contains a production
 	// ready implementation. The server half only consists of a minimal
@@ -75,8 +77,9 @@ func (m *handshakeMagics) write(w io.Writer) {
 // kexAlgorithm abstracts different key exchange algorithms.
 type kexAlgorithm interface {
 	// Server runs server-side key agreement, signing the result
-	// with a hostkey.
-	Server(p packetConn, rand io.Reader, magics *handshakeMagics, s Signer) (*kexResult, error)
+	// with a hostkey. algo is the negotiated algorithm, and may
+	// be a certificate type.
+	Server(p packetConn, rand io.Reader, magics *handshakeMagics, s AlgorithmSigner, algo string) (*kexResult, error)
 
 	// Client runs the client-side key agreement. Caller is
 	// responsible for verifying the host key signature.
@@ -86,6 +89,7 @@ type kexAlgorithm interface {
 // dhGroup is a multiplicative group suitable for implementing Diffie-Hellman key agreement.
 type dhGroup struct {
 	g, p, pMinus1 *big.Int
+	hashFunc      crypto.Hash
 }
 
 func (group *dhGroup) diffieHellman(theirPublic, myPrivate *big.Int) (*big.Int, error) {
@@ -96,8 +100,6 @@ func (group *dhGroup) diffieHellman(theirPublic, myPrivate *big.Int) (*big.Int,
 }
 
 func (group *dhGroup) Client(c packetConn, randSource io.Reader, magics *handshakeMagics) (*kexResult, error) {
-	hashFunc := crypto.SHA1
-
 	var x *big.Int
 	for {
 		var err error
@@ -132,7 +134,7 @@ func (group *dhGroup) Client(c packetConn, randSource io.Reader, magics *handsha
 		return nil, err
 	}
 
-	h := hashFunc.New()
+	h := group.hashFunc.New()
 	magics.write(h)
 	writeString(h, kexDHReply.HostKey)
 	writeInt(h, X)
@@ -146,12 +148,11 @@ func (group *dhGroup) Client(c packetConn, randSource io.Reader, magics *handsha
 		K:         K,
 		HostKey:   kexDHReply.HostKey,
 		Signature: kexDHReply.Signature,
-		Hash:      crypto.SHA1,
+		Hash:      group.hashFunc,
 	}, nil
 }
 
-func (group *dhGroup) Server(c packetConn, randSource io.Reader, magics *handshakeMagics, priv Signer) (result *kexResult, err error) {
-	hashFunc := crypto.SHA1
+func (group *dhGroup) Server(c packetConn, randSource io.Reader, magics *handshakeMagics, priv AlgorithmSigner, algo string) (result *kexResult, err error) {
 	packet, err := c.readPacket()
 	if err != nil {
 		return
@@ -179,7 +180,7 @@ func (group *dhGroup) Server(c packetConn, randSource io.Reader, magics *handsha
 
 	hostKeyBytes := priv.PublicKey().Marshal()
 
-	h := hashFunc.New()
+	h := group.hashFunc.New()
 	magics.write(h)
 	writeString(h, hostKeyBytes)
 	writeInt(h, kexDHInit.X)
@@ -193,7 +194,7 @@ func (group *dhGroup) Server(c packetConn, randSource io.Reader, magics *handsha
 
 	// H is already a hash, but the hostkey signing will apply its
 	// own key-specific hash algorithm.
-	sig, err := signAndMarshal(priv, randSource, H)
+	sig, err := signAndMarshal(priv, randSource, H, algo)
 	if err != nil {
 		return nil, err
 	}
@@ -211,7 +212,7 @@ func (group *dhGroup) Server(c packetConn, randSource io.Reader, magics *handsha
 		K:         K,
 		HostKey:   hostKeyBytes,
 		Signature: sig,
-		Hash:      crypto.SHA1,
+		Hash:      group.hashFunc,
 	}, err
 }
 
@@ -314,7 +315,7 @@ func validateECPublicKey(curve elliptic.Curve, x, y *big.Int) bool {
 	return true
 }
 
-func (kex *ecdh) Server(c packetConn, rand io.Reader, magics *handshakeMagics, priv Signer) (result *kexResult, err error) {
+func (kex *ecdh) Server(c packetConn, rand io.Reader, magics *handshakeMagics, priv AlgorithmSigner, algo string) (result *kexResult, err error) {
 	packet, err := c.readPacket()
 	if err != nil {
 		return nil, err
@@ -359,7 +360,7 @@ func (kex *ecdh) Server(c packetConn, rand io.Reader, magics *handshakeMagics, p
 
 	// H is already a hash, but the hostkey signing will apply its
 	// own key-specific hash algorithm.
-	sig, err := signAndMarshal(priv, rand, H)
+	sig, err := signAndMarshal(priv, rand, H, algo)
 	if err != nil {
 		return nil, err
 	}
@@ -384,39 +385,62 @@ func (kex *ecdh) Server(c packetConn, rand io.Reader, magics *handshakeMagics, p
 	}, nil
 }
 
+// ecHash returns the hash to match the given elliptic curve, see RFC
+// 5656, section 6.2.1
+func ecHash(curve elliptic.Curve) crypto.Hash {
+	bitSize := curve.Params().BitSize
+	switch {
+	case bitSize <= 256:
+		return crypto.SHA256
+	case bitSize <= 384:
+		return crypto.SHA384
+	}
+	return crypto.SHA512
+}
+
 var kexAlgoMap = map[string]kexAlgorithm{}
 
 func init() {
-	// This is the group called diffie-hellman-group1-sha1 in RFC
-	// 4253 and Oakley Group 2 in RFC 2409.
+	// This is the group called diffie-hellman-group1-sha1 in
+	// RFC 4253 and Oakley Group 2 in RFC 2409.
 	p, _ := new(big.Int).SetString("FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7EDEE386BFB5A899FA5AE9F24117C4B1FE649286651ECE65381FFFFFFFFFFFFFFFF", 16)
 	kexAlgoMap[kexAlgoDH1SHA1] = &dhGroup{
-		g:       new(big.Int).SetInt64(2),
-		p:       p,
-		pMinus1: new(big.Int).Sub(p, bigOne),
+		g:        new(big.Int).SetInt64(2),
+		p:        p,
+		pMinus1:  new(big.Int).Sub(p, bigOne),
+		hashFunc: crypto.SHA1,
 	}
 
-	// This is the group called diffie-hellman-group14-sha1 in RFC
-	// 4253 and Oakley Group 14 in RFC 3526.
+	// This are the groups called diffie-hellman-group14-sha1 and
+	// diffie-hellman-group14-sha256 in RFC 4253 and RFC 8268,
+	// and Oakley Group 14 in RFC 3526.
 	p, _ = new(big.Int).SetString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
-
-	kexAlgoMap[kexAlgoDH14SHA1] = &dhGroup{
+	group14 := &dhGroup{
 		g:       new(big.Int).SetInt64(2),
 		p:       p,
 		pMinus1: new(big.Int).Sub(p, bigOne),
 	}
 
+	kexAlgoMap[kexAlgoDH14SHA1] = &dhGroup{
+		g: group14.g, p: group14.p, pMinus1: group14.pMinus1,
+		hashFunc: crypto.SHA1,
+	}
+	kexAlgoMap[kexAlgoDH14SHA256] = &dhGroup{
+		g: group14.g, p: group14.p, pMinus1: group14.pMinus1,
+		hashFunc: crypto.SHA256,
+	}
+
 	kexAlgoMap[kexAlgoECDH521] = &ecdh{elliptic.P521()}
 	kexAlgoMap[kexAlgoECDH384] = &ecdh{elliptic.P384()}
 	kexAlgoMap[kexAlgoECDH256] = &ecdh{elliptic.P256()}
 	kexAlgoMap[kexAlgoCurve25519SHA256] = &curve25519sha256{}
+	kexAlgoMap[kexAlgoCurve25519SHA256LibSSH] = &curve25519sha256{}
 	kexAlgoMap[kexAlgoDHGEXSHA1] = &dhGEXSHA{hashFunc: crypto.SHA1}
 	kexAlgoMap[kexAlgoDHGEXSHA256] = &dhGEXSHA{hashFunc: crypto.SHA256}
 }
 
-// curve25519sha256 implements the curve25519-sha256@libssh.org key
-// agreement protocol, as described in
-// https://git.libssh.org/projects/libssh.git/tree/doc/curve25519-sha256@libssh.org.txt
+// curve25519sha256 implements the curve25519-sha256 (formerly known as
+// curve25519-sha256@libssh.org) key exchange method, as described in RFC 8731.
 type curve25519sha256 struct{}
 
 type curve25519KeyPair struct {
@@ -486,7 +510,7 @@ func (kex *curve25519sha256) Client(c packetConn, rand io.Reader, magics *handsh
 	}, nil
 }
 
-func (kex *curve25519sha256) Server(c packetConn, rand io.Reader, magics *handshakeMagics, priv Signer) (result *kexResult, err error) {
+func (kex *curve25519sha256) Server(c packetConn, rand io.Reader, magics *handshakeMagics, priv AlgorithmSigner, algo string) (result *kexResult, err error) {
 	packet, err := c.readPacket()
 	if err != nil {
 		return
@@ -527,7 +551,7 @@ func (kex *curve25519sha256) Server(c packetConn, rand io.Reader, magics *handsh
 
 	H := h.Sum(nil)
 
-	sig, err := signAndMarshal(priv, rand, H)
+	sig, err := signAndMarshal(priv, rand, H, algo)
 	if err != nil {
 		return nil, err
 	}
@@ -553,7 +577,6 @@ func (kex *curve25519sha256) Server(c packetConn, rand io.Reader, magics *handsh
 // diffie-hellman-group-exchange-sha256 key agreement protocols,
 // as described in RFC 4419
 type dhGEXSHA struct {
-	g, p     *big.Int
 	hashFunc crypto.Hash
 }
 
@@ -563,14 +586,7 @@ const (
 	dhGroupExchangeMaximumBits   = 8192
 )
 
-func (gex *dhGEXSHA) diffieHellman(theirPublic, myPrivate *big.Int) (*big.Int, error) {
-	if theirPublic.Sign() <= 0 || theirPublic.Cmp(gex.p) >= 0 {
-		return nil, fmt.Errorf("ssh: DH parameter out of bounds")
-	}
-	return new(big.Int).Exp(theirPublic, myPrivate, gex.p), nil
-}
-
-func (gex dhGEXSHA) Client(c packetConn, randSource io.Reader, magics *handshakeMagics) (*kexResult, error) {
+func (gex *dhGEXSHA) Client(c packetConn, randSource io.Reader, magics *handshakeMagics) (*kexResult, error) {
 	// Send GexRequest
 	kexDHGexRequest := kexDHGexRequestMsg{
 		MinBits:      dhGroupExchangeMinimumBits,
@@ -587,35 +603,29 @@ func (gex dhGEXSHA) Client(c packetConn, randSource io.Reader, magics *handshake
 		return nil, err
 	}
 
-	var kexDHGexGroup kexDHGexGroupMsg
-	if err = Unmarshal(packet, &kexDHGexGroup); err != nil {
+	var msg kexDHGexGroupMsg
+	if err = Unmarshal(packet, &msg); err != nil {
 		return nil, err
 	}
 
 	// reject if p's bit length < dhGroupExchangeMinimumBits or > dhGroupExchangeMaximumBits
-	if kexDHGexGroup.P.BitLen() < dhGroupExchangeMinimumBits || kexDHGexGroup.P.BitLen() > dhGroupExchangeMaximumBits {
-		return nil, fmt.Errorf("ssh: server-generated gex p is out of range (%d bits)", kexDHGexGroup.P.BitLen())
+	if msg.P.BitLen() < dhGroupExchangeMinimumBits || msg.P.BitLen() > dhGroupExchangeMaximumBits {
+		return nil, fmt.Errorf("ssh: server-generated gex p is out of range (%d bits)", msg.P.BitLen())
 	}
 
-	gex.p = kexDHGexGroup.P
-	gex.g = kexDHGexGroup.G
-
-	// Check if g is safe by verifing that g > 1 and g < p - 1
-	one := big.NewInt(1)
-	var pMinusOne = &big.Int{}
-	pMinusOne.Sub(gex.p, one)
-	if gex.g.Cmp(one) != 1 && gex.g.Cmp(pMinusOne) != -1 {
+	// Check if g is safe by verifying that 1 < g < p-1
+	pMinusOne := new(big.Int).Sub(msg.P, bigOne)
+	if msg.G.Cmp(bigOne) <= 0 || msg.G.Cmp(pMinusOne) >= 0 {
 		return nil, fmt.Errorf("ssh: server provided gex g is not safe")
 	}
 
 	// Send GexInit
-	var pHalf = &big.Int{}
-	pHalf.Rsh(gex.p, 1)
+	pHalf := new(big.Int).Rsh(msg.P, 1)
 	x, err := rand.Int(randSource, pHalf)
 	if err != nil {
 		return nil, err
 	}
-	X := new(big.Int).Exp(gex.g, x, gex.p)
+	X := new(big.Int).Exp(msg.G, x, msg.P)
 	kexDHGexInit := kexDHGexInitMsg{
 		X: X,
 	}
@@ -634,13 +644,13 @@ func (gex dhGEXSHA) Client(c packetConn, randSource io.Reader, magics *handshake
 		return nil, err
 	}
 
-	kInt, err := gex.diffieHellman(kexDHGexReply.Y, x)
-	if err != nil {
-		return nil, err
+	if kexDHGexReply.Y.Cmp(bigOne) <= 0 || kexDHGexReply.Y.Cmp(pMinusOne) >= 0 {
+		return nil, errors.New("ssh: DH parameter out of bounds")
 	}
+	kInt := new(big.Int).Exp(kexDHGexReply.Y, x, msg.P)
 
-	// Check if k is safe by verifing that k > 1 and k < p - 1
-	if kInt.Cmp(one) != 1 && kInt.Cmp(pMinusOne) != -1 {
+	// Check if k is safe by verifying that k > 1 and k < p - 1
+	if kInt.Cmp(bigOne) <= 0 || kInt.Cmp(pMinusOne) >= 0 {
 		return nil, fmt.Errorf("ssh: derived k is not safe")
 	}
 
@@ -650,8 +660,8 @@ func (gex dhGEXSHA) Client(c packetConn, randSource io.Reader, magics *handshake
 	binary.Write(h, binary.BigEndian, uint32(dhGroupExchangeMinimumBits))
 	binary.Write(h, binary.BigEndian, uint32(dhGroupExchangePreferredBits))
 	binary.Write(h, binary.BigEndian, uint32(dhGroupExchangeMaximumBits))
-	writeInt(h, gex.p)
-	writeInt(h, gex.g)
+	writeInt(h, msg.P)
+	writeInt(h, msg.G)
 	writeInt(h, X)
 	writeInt(h, kexDHGexReply.Y)
 	K := make([]byte, intLength(kInt))
@@ -670,7 +680,7 @@ func (gex dhGEXSHA) Client(c packetConn, randSource io.Reader, magics *handshake
 // Server half implementation of the Diffie Hellman Key Exchange with SHA1 and SHA256.
 //
 // This is a minimal implementation to satisfy the automated tests.
-func (gex dhGEXSHA) Server(c packetConn, randSource io.Reader, magics *handshakeMagics, priv Signer) (result *kexResult, err error) {
+func (gex dhGEXSHA) Server(c packetConn, randSource io.Reader, magics *handshakeMagics, priv AlgorithmSigner, algo string) (result *kexResult, err error) {
 	// Receive GexRequest
 	packet, err := c.readPacket()
 	if err != nil {
@@ -681,35 +691,17 @@ func (gex dhGEXSHA) Server(c packetConn, randSource io.Reader, magics *handshake
 		return
 	}
 
-	// smoosh the user's preferred size into our own limits
-	if kexDHGexRequest.PreferedBits > dhGroupExchangeMaximumBits {
-		kexDHGexRequest.PreferedBits = dhGroupExchangeMaximumBits
-	}
-	if kexDHGexRequest.PreferedBits < dhGroupExchangeMinimumBits {
-		kexDHGexRequest.PreferedBits = dhGroupExchangeMinimumBits
-	}
-	// fix min/max if they're inconsistent.  technically, we could just pout
-	// and hang up, but there's no harm in giving them the benefit of the
-	// doubt and just picking a bitsize for them.
-	if kexDHGexRequest.MinBits > kexDHGexRequest.PreferedBits {
-		kexDHGexRequest.MinBits = kexDHGexRequest.PreferedBits
-	}
-	if kexDHGexRequest.MaxBits < kexDHGexRequest.PreferedBits {
-		kexDHGexRequest.MaxBits = kexDHGexRequest.PreferedBits
-	}
-
 	// Send GexGroup
 	// This is the group called diffie-hellman-group14-sha1 in RFC
 	// 4253 and Oakley Group 14 in RFC 3526.
 	p, _ := new(big.Int).SetString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
-	gex.p = p
-	gex.g = big.NewInt(2)
+	g := big.NewInt(2)
 
-	kexDHGexGroup := kexDHGexGroupMsg{
-		P: gex.p,
-		G: gex.g,
+	msg := &kexDHGexGroupMsg{
+		P: p,
+		G: g,
 	}
-	if err := c.writePacket(Marshal(&kexDHGexGroup)); err != nil {
+	if err := c.writePacket(Marshal(msg)); err != nil {
 		return nil, err
 	}
 
@@ -723,19 +715,19 @@ func (gex dhGEXSHA) Server(c packetConn, randSource io.Reader, magics *handshake
 		return
 	}
 
-	var pHalf = &big.Int{}
-	pHalf.Rsh(gex.p, 1)
+	pHalf := new(big.Int).Rsh(p, 1)
 
 	y, err := rand.Int(randSource, pHalf)
 	if err != nil {
 		return
 	}
+	Y := new(big.Int).Exp(g, y, p)
 
-	Y := new(big.Int).Exp(gex.g, y, gex.p)
-	kInt, err := gex.diffieHellman(kexDHGexInit.X, y)
-	if err != nil {
-		return nil, err
+	pMinusOne := new(big.Int).Sub(p, bigOne)
+	if kexDHGexInit.X.Cmp(bigOne) <= 0 || kexDHGexInit.X.Cmp(pMinusOne) >= 0 {
+		return nil, errors.New("ssh: DH parameter out of bounds")
 	}
+	kInt := new(big.Int).Exp(kexDHGexInit.X, y, p)
 
 	hostKeyBytes := priv.PublicKey().Marshal()
 
@@ -745,8 +737,8 @@ func (gex dhGEXSHA) Server(c packetConn, randSource io.Reader, magics *handshake
 	binary.Write(h, binary.BigEndian, uint32(dhGroupExchangeMinimumBits))
 	binary.Write(h, binary.BigEndian, uint32(dhGroupExchangePreferredBits))
 	binary.Write(h, binary.BigEndian, uint32(dhGroupExchangeMaximumBits))
-	writeInt(h, gex.p)
-	writeInt(h, gex.g)
+	writeInt(h, p)
+	writeInt(h, g)
 	writeInt(h, kexDHGexInit.X)
 	writeInt(h, Y)
 
@@ -758,7 +750,7 @@ func (gex dhGEXSHA) Server(c packetConn, randSource io.Reader, magics *handshake
 
 	// H is already a hash, but the hostkey signing will apply its
 	// own key-specific hash algorithm.
-	sig, err := signAndMarshal(priv, randSource, H)
+	sig, err := signAndMarshal(priv, randSource, H, algo)
 	if err != nil {
 		return nil, err
 	}
diff --git a/vendor/golang.org/x/crypto/ssh/keys.go b/vendor/golang.org/x/crypto/ssh/keys.go
index c67d3a31c..1c7de1a6d 100644
--- a/vendor/golang.org/x/crypto/ssh/keys.go
+++ b/vendor/golang.org/x/crypto/ssh/keys.go
@@ -30,8 +30,9 @@ import (
 	"golang.org/x/crypto/ssh/internal/bcrypt_pbkdf"
 )
 
-// These constants represent the algorithm names for key types supported by this
-// package.
+// Public key algorithms names. These values can appear in PublicKey.Type,
+// ClientConfig.HostKeyAlgorithms, Signature.Format, or as AlgorithmSigner
+// arguments.
 const (
 	KeyAlgoRSA        = "ssh-rsa"
 	KeyAlgoDSA        = "ssh-dss"
@@ -41,16 +42,21 @@ const (
 	KeyAlgoECDSA521   = "ecdsa-sha2-nistp521"
 	KeyAlgoED25519    = "ssh-ed25519"
 	KeyAlgoSKED25519  = "sk-ssh-ed25519@openssh.com"
+
+	// KeyAlgoRSASHA256 and KeyAlgoRSASHA512 are only public key algorithms, not
+	// public key formats, so they can't appear as a PublicKey.Type. The
+	// corresponding PublicKey.Type is KeyAlgoRSA. See RFC 8332, Section 2.
+	KeyAlgoRSASHA256 = "rsa-sha2-256"
+	KeyAlgoRSASHA512 = "rsa-sha2-512"
 )
 
-// These constants represent non-default signature algorithms that are supported
-// as algorithm parameters to AlgorithmSigner.SignWithAlgorithm methods. See
-// [PROTOCOL.agent] section 4.5.1 and
-// https://tools.ietf.org/html/draft-ietf-curdle-rsa-sha2-10
 const (
-	SigAlgoRSA        = "ssh-rsa"
-	SigAlgoRSASHA2256 = "rsa-sha2-256"
-	SigAlgoRSASHA2512 = "rsa-sha2-512"
+	// Deprecated: use KeyAlgoRSA.
+	SigAlgoRSA = KeyAlgoRSA
+	// Deprecated: use KeyAlgoRSASHA256.
+	SigAlgoRSASHA2256 = KeyAlgoRSASHA256
+	// Deprecated: use KeyAlgoRSASHA512.
+	SigAlgoRSASHA2512 = KeyAlgoRSASHA512
 )
 
 // parsePubKey parses a public key of the given algorithm.
@@ -70,7 +76,7 @@ func parsePubKey(in []byte, algo string) (pubKey PublicKey, rest []byte, err err
 	case KeyAlgoSKED25519:
 		return parseSKEd25519(in)
 	case CertAlgoRSAv01, CertAlgoDSAv01, CertAlgoECDSA256v01, CertAlgoECDSA384v01, CertAlgoECDSA521v01, CertAlgoSKECDSA256v01, CertAlgoED25519v01, CertAlgoSKED25519v01:
-		cert, err := parseCert(in, certToPrivAlgo(algo))
+		cert, err := parseCert(in, certKeyAlgoNames[algo])
 		if err != nil {
 			return nil, nil, err
 		}
@@ -289,18 +295,21 @@ func MarshalAuthorizedKey(key PublicKey) []byte {
 	return b.Bytes()
 }
 
-// PublicKey is an abstraction of different types of public keys.
+// PublicKey represents a public key using an unspecified algorithm.
+//
+// Some PublicKeys provided by this package also implement CryptoPublicKey.
 type PublicKey interface {
-	// Type returns the key's type, e.g. "ssh-rsa".
+	// Type returns the key format name, e.g. "ssh-rsa".
 	Type() string
 
-	// Marshal returns the serialized key data in SSH wire format,
-	// with the name prefix. To unmarshal the returned data, use
-	// the ParsePublicKey function.
+	// Marshal returns the serialized key data in SSH wire format, with the name
+	// prefix. To unmarshal the returned data, use the ParsePublicKey function.
 	Marshal() []byte
 
-	// Verify that sig is a signature on the given data using this
-	// key. This function will hash the data appropriately first.
+	// Verify that sig is a signature on the given data using this key. This
+	// method will hash the data appropriately first. sig.Format is allowed to
+	// be any signature algorithm compatible with the key type, the caller
+	// should check if it has more stringent requirements.
 	Verify(data []byte, sig *Signature) error
 }
 
@@ -311,25 +320,32 @@ type CryptoPublicKey interface {
 }
 
 // A Signer can create signatures that verify against a public key.
+//
+// Some Signers provided by this package also implement AlgorithmSigner.
 type Signer interface {
-	// PublicKey returns an associated PublicKey instance.
+	// PublicKey returns the associated PublicKey.
 	PublicKey() PublicKey
 
-	// Sign returns raw signature for the given data. This method
-	// will apply the hash specified for the keytype to the data.
+	// Sign returns a signature for the given data. This method will hash the
+	// data appropriately first. The signature algorithm is expected to match
+	// the key format returned by the PublicKey.Type method (and not to be any
+	// alternative algorithm supported by the key format).
 	Sign(rand io.Reader, data []byte) (*Signature, error)
 }
 
-// A AlgorithmSigner is a Signer that also supports specifying a specific
-// algorithm to use for signing.
+// An AlgorithmSigner is a Signer that also supports specifying an algorithm to
+// use for signing.
+//
+// An AlgorithmSigner can't advertise the algorithms it supports, so it should
+// be prepared to be invoked with every algorithm supported by the public key
+// format.
 type AlgorithmSigner interface {
 	Signer
 
-	// SignWithAlgorithm is like Signer.Sign, but allows specification of a
-	// non-default signing algorithm. See the SigAlgo* constants in this
-	// package for signature algorithms supported by this package. Callers may
-	// pass an empty string for the algorithm in which case the AlgorithmSigner
-	// will use its default algorithm.
+	// SignWithAlgorithm is like Signer.Sign, but allows specifying a desired
+	// signing algorithm. Callers may pass an empty string for the algorithm in
+	// which case the AlgorithmSigner will use a default algorithm. This default
+	// doesn't currently control any behavior in this package.
 	SignWithAlgorithm(rand io.Reader, data []byte, algorithm string) (*Signature, error)
 }
 
@@ -381,17 +397,11 @@ func (r *rsaPublicKey) Marshal() []byte {
 }
 
 func (r *rsaPublicKey) Verify(data []byte, sig *Signature) error {
-	var hash crypto.Hash
-	switch sig.Format {
-	case SigAlgoRSA:
-		hash = crypto.SHA1
-	case SigAlgoRSASHA2256:
-		hash = crypto.SHA256
-	case SigAlgoRSASHA2512:
-		hash = crypto.SHA512
-	default:
+	supportedAlgos := algorithmsForKeyFormat(r.Type())
+	if !contains(supportedAlgos, sig.Format) {
 		return fmt.Errorf("ssh: signature type %s for key type %s", sig.Format, r.Type())
 	}
+	hash := hashFuncs[sig.Format]
 	h := hash.New()
 	h.Write(data)
 	digest := h.Sum(nil)
@@ -466,7 +476,7 @@ func (k *dsaPublicKey) Verify(data []byte, sig *Signature) error {
 	if sig.Format != k.Type() {
 		return fmt.Errorf("ssh: signature type %s for key type %s", sig.Format, k.Type())
 	}
-	h := crypto.SHA1.New()
+	h := hashFuncs[sig.Format].New()
 	h.Write(data)
 	digest := h.Sum(nil)
 
@@ -499,7 +509,7 @@ func (k *dsaPrivateKey) PublicKey() PublicKey {
 }
 
 func (k *dsaPrivateKey) Sign(rand io.Reader, data []byte) (*Signature, error) {
-	return k.SignWithAlgorithm(rand, data, "")
+	return k.SignWithAlgorithm(rand, data, k.PublicKey().Type())
 }
 
 func (k *dsaPrivateKey) SignWithAlgorithm(rand io.Reader, data []byte, algorithm string) (*Signature, error) {
@@ -507,7 +517,7 @@ func (k *dsaPrivateKey) SignWithAlgorithm(rand io.Reader, data []byte, algorithm
 		return nil, fmt.Errorf("ssh: unsupported signature algorithm %s", algorithm)
 	}
 
-	h := crypto.SHA1.New()
+	h := hashFuncs[k.PublicKey().Type()].New()
 	h.Write(data)
 	digest := h.Sum(nil)
 	r, s, err := dsa.Sign(rand, k.PrivateKey, digest)
@@ -603,19 +613,6 @@ func supportedEllipticCurve(curve elliptic.Curve) bool {
 	return curve == elliptic.P256() || curve == elliptic.P384() || curve == elliptic.P521()
 }
 
-// ecHash returns the hash to match the given elliptic curve, see RFC
-// 5656, section 6.2.1
-func ecHash(curve elliptic.Curve) crypto.Hash {
-	bitSize := curve.Params().BitSize
-	switch {
-	case bitSize <= 256:
-		return crypto.SHA256
-	case bitSize <= 384:
-		return crypto.SHA384
-	}
-	return crypto.SHA512
-}
-
 // parseECDSA parses an ECDSA key according to RFC 5656, section 3.1.
 func parseECDSA(in []byte) (out PublicKey, rest []byte, err error) {
 	var w struct {
@@ -671,7 +668,7 @@ func (k *ecdsaPublicKey) Verify(data []byte, sig *Signature) error {
 		return fmt.Errorf("ssh: signature type %s for key type %s", sig.Format, k.Type())
 	}
 
-	h := ecHash(k.Curve).New()
+	h := hashFuncs[sig.Format].New()
 	h.Write(data)
 	digest := h.Sum(nil)
 
@@ -775,7 +772,7 @@ func (k *skECDSAPublicKey) Verify(data []byte, sig *Signature) error {
 		return fmt.Errorf("ssh: signature type %s for key type %s", sig.Format, k.Type())
 	}
 
-	h := ecHash(k.Curve).New()
+	h := hashFuncs[sig.Format].New()
 	h.Write([]byte(k.application))
 	appDigest := h.Sum(nil)
 
@@ -874,7 +871,7 @@ func (k *skEd25519PublicKey) Verify(data []byte, sig *Signature) error {
 		return fmt.Errorf("invalid size %d for Ed25519 public key", l)
 	}
 
-	h := sha256.New()
+	h := hashFuncs[sig.Format].New()
 	h.Write([]byte(k.application))
 	appDigest := h.Sum(nil)
 
@@ -939,15 +936,6 @@ func newDSAPrivateKey(key *dsa.PrivateKey) (Signer, error) {
 	return &dsaPrivateKey{key}, nil
 }
 
-type rsaSigner struct {
-	AlgorithmSigner
-	defaultAlgorithm string
-}
-
-func (s *rsaSigner) Sign(rand io.Reader, data []byte) (*Signature, error) {
-	return s.AlgorithmSigner.SignWithAlgorithm(rand, data, s.defaultAlgorithm)
-}
-
 type wrappedSigner struct {
 	signer crypto.Signer
 	pubKey PublicKey
@@ -970,44 +958,20 @@ func (s *wrappedSigner) PublicKey() PublicKey {
 }
 
 func (s *wrappedSigner) Sign(rand io.Reader, data []byte) (*Signature, error) {
-	return s.SignWithAlgorithm(rand, data, "")
+	return s.SignWithAlgorithm(rand, data, s.pubKey.Type())
 }
 
 func (s *wrappedSigner) SignWithAlgorithm(rand io.Reader, data []byte, algorithm string) (*Signature, error) {
-	var hashFunc crypto.Hash
-
-	if _, ok := s.pubKey.(*rsaPublicKey); ok {
-		// RSA keys support a few hash functions determined by the requested signature algorithm
-		switch algorithm {
-		case "", SigAlgoRSA:
-			algorithm = SigAlgoRSA
-			hashFunc = crypto.SHA1
-		case SigAlgoRSASHA2256:
-			hashFunc = crypto.SHA256
-		case SigAlgoRSASHA2512:
-			hashFunc = crypto.SHA512
-		default:
-			return nil, fmt.Errorf("ssh: unsupported signature algorithm %s", algorithm)
-		}
-	} else {
-		// The only supported algorithm for all other key types is the same as the type of the key
-		if algorithm == "" {
-			algorithm = s.pubKey.Type()
-		} else if algorithm != s.pubKey.Type() {
-			return nil, fmt.Errorf("ssh: unsupported signature algorithm %s", algorithm)
-		}
+	if algorithm == "" {
+		algorithm = s.pubKey.Type()
+	}
 
-		switch key := s.pubKey.(type) {
-		case *dsaPublicKey:
-			hashFunc = crypto.SHA1
-		case *ecdsaPublicKey:
-			hashFunc = ecHash(key.Curve)
-		case ed25519PublicKey:
-		default:
-			return nil, fmt.Errorf("ssh: unsupported key type %T", key)
-		}
+	supportedAlgos := algorithmsForKeyFormat(s.pubKey.Type())
+	if !contains(supportedAlgos, algorithm) {
+		return nil, fmt.Errorf("ssh: unsupported signature algorithm %q for key format %q", algorithm, s.pubKey.Type())
 	}
 
+	hashFunc := hashFuncs[algorithm]
 	var digest []byte
 	if hashFunc != 0 {
 		h := hashFunc.New()
diff --git a/vendor/golang.org/x/crypto/ssh/messages.go b/vendor/golang.org/x/crypto/ssh/messages.go
index ac41a4168..19bc67c46 100644
--- a/vendor/golang.org/x/crypto/ssh/messages.go
+++ b/vendor/golang.org/x/crypto/ssh/messages.go
@@ -141,6 +141,14 @@ type serviceAcceptMsg struct {
 	Service string `sshtype:"6"`
 }
 
+// See RFC 8308, section 2.3
+const msgExtInfo = 7
+
+type extInfoMsg struct {
+	NumExtensions uint32 `sshtype:"7"`
+	Payload       []byte `ssh:"rest"`
+}
+
 // See RFC 4252, section 5.
 const msgUserAuthRequest = 50
 
@@ -180,11 +188,11 @@ const msgUserAuthInfoRequest = 60
 const msgUserAuthInfoResponse = 61
 
 type userAuthInfoRequestMsg struct {
-	User               string `sshtype:"60"`
-	Instruction        string
-	DeprecatedLanguage string
-	NumPrompts         uint32
-	Prompts            []byte `ssh:"rest"`
+	Name        string `sshtype:"60"`
+	Instruction string
+	Language    string
+	NumPrompts  uint32
+	Prompts     []byte `ssh:"rest"`
 }
 
 // See RFC 4254, section 5.1.
@@ -782,6 +790,8 @@ func decode(packet []byte) (interface{}, error) {
 		msg = new(serviceRequestMsg)
 	case msgServiceAccept:
 		msg = new(serviceAcceptMsg)
+	case msgExtInfo:
+		msg = new(extInfoMsg)
 	case msgKexInit:
 		msg = new(kexInitMsg)
 	case msgKexDHInit:
@@ -843,6 +853,7 @@ var packetTypeNames = map[byte]string{
 	msgDisconnect:          "disconnectMsg",
 	msgServiceRequest:      "serviceRequestMsg",
 	msgServiceAccept:       "serviceAcceptMsg",
+	msgExtInfo:             "extInfoMsg",
 	msgKexInit:             "kexInitMsg",
 	msgKexDHInit:           "kexDHInitMsg",
 	msgKexDHReply:          "kexDHReplyMsg",
diff --git a/vendor/golang.org/x/crypto/ssh/server.go b/vendor/golang.org/x/crypto/ssh/server.go
index 6a58e1208..70045bdfd 100644
--- a/vendor/golang.org/x/crypto/ssh/server.go
+++ b/vendor/golang.org/x/crypto/ssh/server.go
@@ -120,7 +120,7 @@ type ServerConfig struct {
 }
 
 // AddHostKey adds a private key as a host key. If an existing host
-// key exists with the same algorithm, it is overwritten. Each server
+// key exists with the same public key format, it is replaced. Each server
 // config must have at least one host key.
 func (s *ServerConfig) AddHostKey(key Signer) {
 	for i, k := range s.hostKeys {
@@ -212,9 +212,10 @@ func NewServerConn(c net.Conn, config *ServerConfig) (*ServerConn, <-chan NewCha
 }
 
 // signAndMarshal signs the data with the appropriate algorithm,
-// and serializes the result in SSH wire format.
-func signAndMarshal(k Signer, rand io.Reader, data []byte) ([]byte, error) {
-	sig, err := k.Sign(rand, data)
+// and serializes the result in SSH wire format. algo is the negotiate
+// algorithm and may be a certificate type.
+func signAndMarshal(k AlgorithmSigner, rand io.Reader, data []byte, algo string) ([]byte, error) {
+	sig, err := k.SignWithAlgorithm(rand, data, underlyingAlgo(algo))
 	if err != nil {
 		return nil, err
 	}
@@ -284,7 +285,7 @@ func (s *connection) serverHandshake(config *ServerConfig) (*Permissions, error)
 
 func isAcceptableAlgo(algo string) bool {
 	switch algo {
-	case SigAlgoRSA, SigAlgoRSASHA2256, SigAlgoRSASHA2512, KeyAlgoDSA, KeyAlgoECDSA256, KeyAlgoECDSA384, KeyAlgoECDSA521, KeyAlgoSKECDSA256, KeyAlgoED25519, KeyAlgoSKED25519,
+	case KeyAlgoRSA, KeyAlgoRSASHA256, KeyAlgoRSASHA512, KeyAlgoDSA, KeyAlgoECDSA256, KeyAlgoECDSA384, KeyAlgoECDSA521, KeyAlgoSKECDSA256, KeyAlgoED25519, KeyAlgoSKED25519,
 		CertAlgoRSAv01, CertAlgoDSAv01, CertAlgoECDSA256v01, CertAlgoECDSA384v01, CertAlgoECDSA521v01, CertAlgoSKECDSA256v01, CertAlgoED25519v01, CertAlgoSKED25519v01:
 		return true
 	}
@@ -553,6 +554,7 @@ userAuthLoop:
 				if !ok || len(payload) > 0 {
 					return nil, parseError(msgUserAuthRequest)
 				}
+
 				// Ensure the public key algo and signature algo
 				// are supported.  Compare the private key
 				// algorithm name that corresponds to algo with
@@ -562,7 +564,12 @@ userAuthLoop:
 					authErr = fmt.Errorf("ssh: algorithm %q not accepted", sig.Format)
 					break
 				}
-				signedData := buildDataSignedForAuth(sessionID, userAuthReq, algoBytes, pubKeyData)
+				if underlyingAlgo(algo) != sig.Format {
+					authErr = fmt.Errorf("ssh: signature %q not compatible with selected algorithm %q", sig.Format, algo)
+					break
+				}
+
+				signedData := buildDataSignedForAuth(sessionID, userAuthReq, algo, pubKeyData)
 
 				if err := pubKey.Verify(signedData, sig); err != nil {
 					return nil, err
@@ -633,6 +640,30 @@ userAuthLoop:
 		}
 
 		authFailures++
+		if config.MaxAuthTries > 0 && authFailures >= config.MaxAuthTries {
+			// If we have hit the max attempts, don't bother sending the
+			// final SSH_MSG_USERAUTH_FAILURE message, since there are
+			// no more authentication methods which can be attempted,
+			// and this message may cause the client to re-attempt
+			// authentication while we send the disconnect message.
+			// Continue, and trigger the disconnect at the start of
+			// the loop.
+			//
+			// The SSH specification is somewhat confusing about this,
+			// RFC 4252 Section 5.1 requires each authentication failure
+			// be responded to with a respective SSH_MSG_USERAUTH_FAILURE
+			// message, but Section 4 says the server should disconnect
+			// after some number of attempts, but it isn't explicit which
+			// message should take precedence (i.e. should there be a failure
+			// message than a disconnect message, or if we are going to
+			// disconnect, should we only send that message.)
+			//
+			// Either way, OpenSSH disconnects immediately after the last
+			// failed authnetication attempt, and given they are typically
+			// considered the golden implementation it seems reasonable
+			// to match that behavior.
+			continue
+		}
 
 		var failureMsg userAuthFailureMsg
 		if config.PasswordCallback != nil {
@@ -670,7 +701,7 @@ type sshClientKeyboardInteractive struct {
 	*connection
 }
 
-func (c *sshClientKeyboardInteractive) Challenge(user, instruction string, questions []string, echos []bool) (answers []string, err error) {
+func (c *sshClientKeyboardInteractive) Challenge(name, instruction string, questions []string, echos []bool) (answers []string, err error) {
 	if len(questions) != len(echos) {
 		return nil, errors.New("ssh: echos and questions must have equal length")
 	}
@@ -682,6 +713,7 @@ func (c *sshClientKeyboardInteractive) Challenge(user, instruction string, quest
 	}
 
 	if err := c.transport.writePacket(Marshal(&userAuthInfoRequestMsg{
+		Name:        name,
 		Instruction: instruction,
 		NumPrompts:  uint32(len(questions)),
 		Prompts:     prompts,
diff --git a/vendor/golang.org/x/crypto/ssh/session.go b/vendor/golang.org/x/crypto/ssh/session.go
index d3321f6b7..eca31a22d 100644
--- a/vendor/golang.org/x/crypto/ssh/session.go
+++ b/vendor/golang.org/x/crypto/ssh/session.go
@@ -85,6 +85,7 @@ const (
 	IXANY         = 39
 	IXOFF         = 40
 	IMAXBEL       = 41
+	IUTF8         = 42 // RFC 8160
 	ISIG          = 50
 	ICANON        = 51
 	XCASE         = 52
diff --git a/vendor/golang.org/x/crypto/ssh/transport.go b/vendor/golang.org/x/crypto/ssh/transport.go
index 49ddc2e7d..acf5a21bb 100644
--- a/vendor/golang.org/x/crypto/ssh/transport.go
+++ b/vendor/golang.org/x/crypto/ssh/transport.go
@@ -238,15 +238,19 @@ var (
 // (to setup server->client keys) or clientKeys (for client->server keys).
 func newPacketCipher(d direction, algs directionAlgorithms, kex *kexResult) (packetCipher, error) {
 	cipherMode := cipherModes[algs.Cipher]
-	macMode := macModes[algs.MAC]
 
 	iv := make([]byte, cipherMode.ivSize)
 	key := make([]byte, cipherMode.keySize)
-	macKey := make([]byte, macMode.keySize)
 
 	generateKeyMaterial(iv, d.ivTag, kex)
 	generateKeyMaterial(key, d.keyTag, kex)
-	generateKeyMaterial(macKey, d.macKeyTag, kex)
+
+	var macKey []byte
+	if !aeadCiphers[algs.Cipher] {
+		macMode := macModes[algs.MAC]
+		macKey = make([]byte, macMode.keySize)
+		generateKeyMaterial(macKey, d.macKeyTag, kex)
+	}
 
 	return cipherModes[algs.Cipher].create(key, iv, macKey, algs)
 }
diff --git a/vendor/modules.txt b/vendor/modules.txt
index a3fdf4600..11ee3b189 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -699,7 +699,7 @@ go.opencensus.io/internal
 go.opencensus.io/trace
 go.opencensus.io/trace/internal
 go.opencensus.io/trace/tracestate
-# golang.org/x/crypto v0.0.0-20220112180741-5e0467b6c7ce
+# golang.org/x/crypto v0.0.0-20220411220226-7b82a4e95df4
 ## explicit
 golang.org/x/crypto/blowfish
 golang.org/x/crypto/cast5
@@ -707,7 +707,6 @@ golang.org/x/crypto/chacha20
 golang.org/x/crypto/curve25519
 golang.org/x/crypto/curve25519/internal/field
 golang.org/x/crypto/ed25519
-golang.org/x/crypto/ed25519/internal/edwards25519
 golang.org/x/crypto/internal/poly1305
 golang.org/x/crypto/internal/subtle
 golang.org/x/crypto/openpgp