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package sha1crypt
import (
"fmt"
"strconv"
"github.com/go-crypt/crypt/algorithm"
"github.com/go-crypt/crypt/internal/encoding"
)
// RegisterDecoder the decoder with the algorithm.DecoderRegister.
func RegisterDecoder(r algorithm.DecoderRegister) (err error) {
if err = RegisterDecoderCommon(r); err != nil {
return err
}
return nil
}
// RegisterDecoderCommon registers specifically the common decoder variant with the algorithm.DecoderRegister.
func RegisterDecoderCommon(r algorithm.DecoderRegister) (err error) {
if err = r.RegisterDecodeFunc(AlgIdentifier, Decode); err != nil {
return err
}
return nil
}
// Decode the encoded digest into a algorithm.Digest.
func Decode(encodedDigest string) (digest algorithm.Digest, err error) {
var (
parts []string
)
if parts, err = decoderParts(encodedDigest); err != nil {
return nil, fmt.Errorf(algorithm.ErrFmtDigestDecode, AlgName, err)
}
if digest, err = decode(parts); err != nil {
return nil, fmt.Errorf(algorithm.ErrFmtDigestDecode, AlgName, err)
}
return digest, nil
}
func decoderParts(encodedDigest string) (parts []string, err error) {
parts = encoding.Split(encodedDigest, -1)
if len(parts) != 5 {
return nil, algorithm.ErrEncodedHashInvalidFormat
}
if parts[1] != AlgIdentifier {
return nil, fmt.Errorf("%w: identifier '%s' is not an encoded %s digest", algorithm.ErrEncodedHashInvalidIdentifier, parts[1], AlgName)
}
return parts[2:], nil
}
func decode(parts []string) (digest algorithm.Digest, err error) {
decoded := &Digest{}
if parts[0] != "" {
var iterations uint64
if iterations, err = strconv.ParseUint(parts[0], 10, 32); err != nil {
return nil, fmt.Errorf("%w: option '%s' has invalid value '%s': %v", algorithm.ErrEncodedHashInvalidOptionValue, "rounds", parts[0], err)
}
decoded.iterations = uint32(iterations)
}
decoded.salt, decoded.key = []byte(parts[1]), []byte(parts[2])
return decoded, nil
}
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