diff options
Diffstat (limited to 'vendor/github.com/fullsailor/pkcs7/ber.go')
| -rw-r--r-- | vendor/github.com/fullsailor/pkcs7/ber.go | 248 |
1 files changed, 0 insertions, 248 deletions
diff --git a/vendor/github.com/fullsailor/pkcs7/ber.go b/vendor/github.com/fullsailor/pkcs7/ber.go deleted file mode 100644 index 89e96d30c..000000000 --- a/vendor/github.com/fullsailor/pkcs7/ber.go +++ /dev/null @@ -1,248 +0,0 @@ -package pkcs7 - -import ( - "bytes" - "errors" -) - -// var encodeIndent = 0 - -type asn1Object interface { - EncodeTo(writer *bytes.Buffer) error -} - -type asn1Structured struct { - tagBytes []byte - content []asn1Object -} - -func (s asn1Structured) EncodeTo(out *bytes.Buffer) error { - //fmt.Printf("%s--> tag: % X\n", strings.Repeat("| ", encodeIndent), s.tagBytes) - //encodeIndent++ - inner := new(bytes.Buffer) - for _, obj := range s.content { - err := obj.EncodeTo(inner) - if err != nil { - return err - } - } - //encodeIndent-- - out.Write(s.tagBytes) - encodeLength(out, inner.Len()) - out.Write(inner.Bytes()) - return nil -} - -type asn1Primitive struct { - tagBytes []byte - length int - content []byte -} - -func (p asn1Primitive) EncodeTo(out *bytes.Buffer) error { - _, err := out.Write(p.tagBytes) - if err != nil { - return err - } - if err = encodeLength(out, p.length); err != nil { - return err - } - //fmt.Printf("%s--> tag: % X length: %d\n", strings.Repeat("| ", encodeIndent), p.tagBytes, p.length) - //fmt.Printf("%s--> content length: %d\n", strings.Repeat("| ", encodeIndent), len(p.content)) - out.Write(p.content) - - return nil -} - -func ber2der(ber []byte) ([]byte, error) { - if len(ber) == 0 { - return nil, errors.New("ber2der: input ber is empty") - } - //fmt.Printf("--> ber2der: Transcoding %d bytes\n", len(ber)) - out := new(bytes.Buffer) - - obj, _, err := readObject(ber, 0) - if err != nil { - return nil, err - } - obj.EncodeTo(out) - - // if offset < len(ber) { - // return nil, fmt.Errorf("ber2der: Content longer than expected. Got %d, expected %d", offset, len(ber)) - //} - - return out.Bytes(), nil -} - -// encodes lengths that are longer than 127 into string of bytes -func marshalLongLength(out *bytes.Buffer, i int) (err error) { - n := lengthLength(i) - - for ; n > 0; n-- { - err = out.WriteByte(byte(i >> uint((n-1)*8))) - if err != nil { - return - } - } - - return nil -} - -// computes the byte length of an encoded length value -func lengthLength(i int) (numBytes int) { - numBytes = 1 - for i > 255 { - numBytes++ - i >>= 8 - } - return -} - -// encodes the length in DER format -// If the length fits in 7 bits, the value is encoded directly. -// -// Otherwise, the number of bytes to encode the length is first determined. -// This number is likely to be 4 or less for a 32bit length. This number is -// added to 0x80. The length is encoded in big endian encoding follow after -// -// Examples: -// length | byte 1 | bytes n -// 0 | 0x00 | - -// 120 | 0x78 | - -// 200 | 0x81 | 0xC8 -// 500 | 0x82 | 0x01 0xF4 -// -func encodeLength(out *bytes.Buffer, length int) (err error) { - if length >= 128 { - l := lengthLength(length) - err = out.WriteByte(0x80 | byte(l)) - if err != nil { - return - } - err = marshalLongLength(out, length) - if err != nil { - return - } - } else { - err = out.WriteByte(byte(length)) - if err != nil { - return - } - } - return -} - -func readObject(ber []byte, offset int) (asn1Object, int, error) { - //fmt.Printf("\n====> Starting readObject at offset: %d\n\n", offset) - tagStart := offset - b := ber[offset] - offset++ - tag := b & 0x1F // last 5 bits - if tag == 0x1F { - tag = 0 - for ber[offset] >= 0x80 { - tag = tag*128 + ber[offset] - 0x80 - offset++ - } - tag = tag*128 + ber[offset] - 0x80 - offset++ - } - tagEnd := offset - - kind := b & 0x20 - /* - if kind == 0 { - fmt.Print("--> Primitive\n") - } else { - fmt.Print("--> Constructed\n") - } - */ - // read length - var length int - l := ber[offset] - offset++ - indefinite := false - if l > 0x80 { - numberOfBytes := (int)(l & 0x7F) - if numberOfBytes > 4 { // int is only guaranteed to be 32bit - return nil, 0, errors.New("ber2der: BER tag length too long") - } - if numberOfBytes == 4 && (int)(ber[offset]) > 0x7F { - return nil, 0, errors.New("ber2der: BER tag length is negative") - } - if 0x0 == (int)(ber[offset]) { - return nil, 0, errors.New("ber2der: BER tag length has leading zero") - } - //fmt.Printf("--> (compute length) indicator byte: %x\n", l) - //fmt.Printf("--> (compute length) length bytes: % X\n", ber[offset:offset+numberOfBytes]) - for i := 0; i < numberOfBytes; i++ { - length = length*256 + (int)(ber[offset]) - offset++ - } - } else if l == 0x80 { - indefinite = true - } else { - length = (int)(l) - } - - //fmt.Printf("--> length : %d\n", length) - contentEnd := offset + length - if contentEnd > len(ber) { - return nil, 0, errors.New("ber2der: BER tag length is more than available data") - } - //fmt.Printf("--> content start : %d\n", offset) - //fmt.Printf("--> content end : %d\n", contentEnd) - //fmt.Printf("--> content : % X\n", ber[offset:contentEnd]) - var obj asn1Object - if indefinite && kind == 0 { - return nil, 0, errors.New("ber2der: Indefinite form tag must have constructed encoding") - } - if kind == 0 { - obj = asn1Primitive{ - tagBytes: ber[tagStart:tagEnd], - length: length, - content: ber[offset:contentEnd], - } - } else { - var subObjects []asn1Object - for (offset < contentEnd) || indefinite { - var subObj asn1Object - var err error - subObj, offset, err = readObject(ber, offset) - if err != nil { - return nil, 0, err - } - subObjects = append(subObjects, subObj) - - if indefinite { - terminated, err := isIndefiniteTermination(ber, offset) - if err != nil { - return nil, 0, err - } - - if terminated { - break - } - } - } - obj = asn1Structured{ - tagBytes: ber[tagStart:tagEnd], - content: subObjects, - } - } - - // Apply indefinite form length with 0x0000 terminator. - if indefinite { - contentEnd = offset + 2 - } - - return obj, contentEnd, nil -} - -func isIndefiniteTermination(ber []byte, offset int) (bool, error) { - if len(ber) - offset < 2 { - return false, errors.New("ber2der: Invalid BER format") - } - - return bytes.Index(ber[offset:], []byte{0x0, 0x0}) == 0, nil -} |