1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
|
package scrypt
import (
"encoding/base64"
"fmt"
"github.com/go-crypt/x/yescrypt"
"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 = RegisterDecoderScrypt(r); err != nil {
return err
}
if err = RegisterDecoderYescrypt(r); err != nil {
return err
}
return nil
}
// RegisterDecoderScrypt the scrypt decoder with the algorithm.DecoderRegister.
func RegisterDecoderScrypt(r algorithm.DecoderRegister) (err error) {
if err = r.RegisterDecodeFunc(VariantScrypt.Prefix(), Decode); err != nil {
return err
}
return nil
}
// RegisterDecoderYescrypt the yescrypt decoder with the algorithm.DecoderRegister.
func RegisterDecoderYescrypt(r algorithm.DecoderRegister) (err error) {
if err = r.RegisterDecodeFunc(VariantYescrypt.Prefix(), Decode); err != nil {
return err
}
return nil
}
// Decode the encoded digest into a algorithm.Digest.
func Decode(encodedDigest string) (digest algorithm.Digest, err error) {
return DecodeVariant(VariantNone)(encodedDigest)
}
// DecodeVariant the encoded digest into a algorithm.Digest provided it matches the provided scrypt.Variant. If
// scrypt.VariantNone is used all variants can be decoded.
func DecodeVariant(v Variant) func(encodedDigest string) (digest algorithm.Digest, err error) {
return func(encodedDigest string) (digest algorithm.Digest, err error) {
var (
parts []string
variant Variant
)
if variant, parts, err = decoderParts(encodedDigest); err != nil {
return nil, fmt.Errorf(algorithm.ErrFmtDigestDecode, AlgName, err)
}
if v != VariantNone && v != variant {
return nil, fmt.Errorf(algorithm.ErrFmtDigestDecode, AlgName, fmt.Errorf("the '%s' variant cannot be decoded only the '%s' variant can be", variant.String(), v.String()))
}
if digest, err = decode(variant, parts); err != nil {
return nil, fmt.Errorf(algorithm.ErrFmtDigestDecode, AlgName, err)
}
return digest, nil
}
}
func decoderParts(encodedDigest string) (variant Variant, parts []string, err error) {
parts = encoding.Split(encodedDigest, -1)
if len(parts) != 5 {
return VariantNone, nil, algorithm.ErrEncodedHashInvalidFormat
}
variant = NewVariant(parts[1])
if variant == VariantNone {
return variant, nil, fmt.Errorf("%w: identifier '%s' is not an encoded %s digest", algorithm.ErrEncodedHashInvalidIdentifier, parts[1], AlgName)
}
return variant, parts[2:], nil
}
func decode(variant Variant, parts []string) (digest algorithm.Digest, err error) {
decoded := &Digest{
variant: variant,
ln: IterationsDefault,
r: BlockSizeDefault,
p: ParallelismDefault,
}
switch variant {
case VariantYescrypt:
if _, decoded.ln, decoded.r, err = yescrypt.DecodeSetting([]byte(parts[0])); err != nil {
return nil, fmt.Errorf(algorithm.ErrFmtDigestDecode, AlgName, err)
}
decoded.salt, decoded.key = yescrypt.Decode64([]byte(parts[1])), yescrypt.Decode64([]byte(parts[2]))
default:
var params []encoding.Parameter
if params, err = encoding.DecodeParameterStr(parts[0]); err != nil {
return nil, err
}
for _, param := range params {
switch param.Key {
case oLN:
decoded.ln, err = param.Int()
case oR:
decoded.r, err = param.Int()
case oP:
decoded.p, err = param.Int()
default:
return nil, fmt.Errorf("%w: option '%s' with value '%s' is unknown", algorithm.ErrEncodedHashInvalidOptionKey, param.Key, param.Value)
}
if err != nil {
return nil, fmt.Errorf("%w: option '%s' has invalid value '%s': %v", algorithm.ErrEncodedHashInvalidOptionValue, param.Key, param.Value, err)
}
}
if decoded.salt, err = base64.RawStdEncoding.DecodeString(parts[1]); err != nil {
return nil, fmt.Errorf("%w: %v", algorithm.ErrEncodedHashSaltEncoding, err)
}
if decoded.key, err = base64.RawStdEncoding.DecodeString(parts[2]); err != nil {
return nil, fmt.Errorf("%w: %v", algorithm.ErrEncodedHashKeyEncoding, err)
}
}
if len(decoded.key) == 0 {
return nil, fmt.Errorf("%w: key has 0 bytes", algorithm.ErrEncodedHashKeyEncoding)
}
return decoded, nil
}
|
