// Parse reads a binary specification for a string-to-key transformation from r
// and returns a function which performs that transform.
func Parse(r io.Reader) (f func(out, in []byte), err error) {
var buf [9]byte
_, err = io.ReadFull(r, buf[:2])
if err != nil {
return
}
// GNU Extensions; handle them before we try to look for a hash, which won't
// be needed in most cases anyway.
if buf[0] == 101 {
return parseGNUExtensions(r)
}
hash, ok := HashIdToHash(buf[1])
if !ok {
return nil, errors.UnsupportedError("hash for S2K function: " + strconv.Itoa(int(buf[1])))
}
if !hash.Available() {
return nil, errors.UnsupportedError("hash not available: " + strconv.Itoa(int(hash)))
}
h := hash.New()
switch buf[0] {
case 0:
f := func(out, in []byte) {
Simple(out, h, in)
}
return f, nil
case 1:
_, err = io.ReadFull(r, buf[:8])
if err != nil {
return
}
f := func(out, in []byte) {
Salted(out, h, in, buf[:8])
}
return f, nil
case 3:
_, err = io.ReadFull(r, buf[:9])
if err != nil {
return
}
count := decodeCount(buf[8])
f := func(out, in []byte) {
Iterated(out, h, in, buf[:8], count)
}
return f, nil
}
return nil, errors.UnsupportedError("S2K function")
}
// Parse reads a binary specification for a string-to-key transformation from r
// and returns a function which performs that transform.
func Parse(r io.Reader) (f func(out, in []byte), err error) {
var buf [9]byte
_, err = io.ReadFull(r, buf[:2])
if err != nil {
return
}
hash, ok := HashIdToHash(buf[1])
if !ok {
return nil, errors.UnsupportedError("hash for S2K function: " + strconv.Itoa(int(buf[1])))
}
if !hash.Available() {
return nil, errors.UnsupportedError("hash not available: " + strconv.Itoa(int(hash)))
}
h := hash.New()
switch buf[0] {
case 0:
f := func(out, in []byte) {
Simple(out, h, in)
}
return f, nil
case 1:
_, err = io.ReadFull(r, buf[:8])
if err != nil {
return
}
f := func(out, in []byte) {
Salted(out, h, in, buf[:8])
}
return f, nil
case 3:
_, err = io.ReadFull(r, buf[:9])
if err != nil {
return
}
count := decodeCount(buf[8])
f := func(out, in []byte) {
Iterated(out, h, in, buf[:8], count)
}
return f, nil
}
return nil, errors.UnsupportedError("S2K function")
}
// Parse reads a binary specification for a string-to-key transformation from r
// and returns a function which performs that transform.
func Parse(r io.Reader) (f func(out, in []byte), err error) {
var buf [9]byte
_, err = io.ReadFull(r, buf[:2])
if err != nil {
return
}
hash, ok := HashIdToHash(buf[1])
if !ok {
return nil, errors.UnsupportedError("hash for S2K function: " + strconv.Itoa(int(buf[1])))
}
if !hash.Available() {
return nil, errors.UnsupportedError("hash not available: " + strconv.Itoa(int(hash)))
}
h := hash.New()
switch buf[0] {
case 0:
f := func(out, in []byte) {
Simple(out, h, in)
}
return f, nil
case 1:
_, err = io.ReadFull(r, buf[:8])
if err != nil {
return
}
f := func(out, in []byte) {
Salted(out, h, in, buf[:8])
}
return f, nil
case 3:
_, err = io.ReadFull(r, buf[:9])
if err != nil {
return
}
count := decodeCount(buf[8])
f := func(out, in []byte) {
Iterated(out, h, in, buf[:8], count)
}
return f, nil
// GNU Extensions
case 101:
// A three-byte string identifier
_, err = io.ReadFull(r, buf[:3])
if err != nil {
return
}
gnuExt := string(buf[:3])
if gnuExt != "GNU" {
return nil, errors.UnsupportedError("Malformed GNU extension: " + gnuExt)
}
_, err = io.ReadFull(r, buf[:1])
if err != nil {
return
}
gnuExtType := int(buf[0])
if gnuExtType != 1 {
return nil, errors.UnsupportedError("unknown S2K GNU protection mode: " + strconv.Itoa(int(gnuExtType)))
}
return nil, nil
}
return nil, errors.UnsupportedError("S2K function")
}