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
|
package shacrypt
import (
"crypto/subtle"
"fmt"
"strings"
xcrypt "github.com/go-crypt/x/crypt"
"github.com/go-crypt/crypt/algorithm"
)
// Digest is a digest which handles SHA-crypt hashes like SHA256 or SHA512.
type Digest struct {
variant Variant
iterations int
salt, key []byte
}
// Match returns true if the string password matches the current shacrypt.Digest.
func (d *Digest) Match(password string) (match bool) {
return d.MatchBytes([]byte(password))
}
// MatchBytes returns true if the []byte passwordBytes matches the current shacrypt.Digest.
func (d *Digest) MatchBytes(passwordBytes []byte) (match bool) {
match, _ = d.MatchBytesAdvanced(passwordBytes)
return match
}
// MatchAdvanced is the same as Match except if there is an error it returns that as well.
func (d *Digest) MatchAdvanced(password string) (match bool, err error) {
if match, err = d.MatchBytesAdvanced([]byte(password)); err != nil {
return match, fmt.Errorf(algorithm.ErrFmtDigestMatch, AlgName, err)
}
return match, nil
}
// MatchBytesAdvanced is the same as MatchBytes except if there is an error it returns that as well.
func (d *Digest) MatchBytesAdvanced(passwordBytes []byte) (match bool, err error) {
if len(d.key) == 0 {
return false, fmt.Errorf("%w: key has 0 bytes", algorithm.ErrPasswordInvalid)
}
return subtle.ConstantTimeCompare(d.key, xcrypt.KeySHACrypt(d.variant.HashFunc(), passwordBytes, d.salt, d.iterations)) == 1, nil
}
// Encode this Digest as a string for storage.
func (d *Digest) Encode() (hash string) {
switch d.iterations {
case IterationsDefaultOmitted:
return strings.ReplaceAll(fmt.Sprintf(EncodingFmtRoundsOmitted,
d.variant.Prefix(),
d.salt, d.key,
), "\n", "")
default:
return strings.ReplaceAll(fmt.Sprintf(EncodingFmt,
d.variant.Prefix(), d.iterations,
d.salt, d.key,
), "\n", "")
}
}
// String returns the storable format of the shacrypt.Digest hash utilizing fmt.Sprintf and shacrypt.EncodingFmt.
func (d *Digest) String() string {
return d.Encode()
}
func (d *Digest) defaults() {
switch d.variant {
case VariantSHA256, VariantSHA512:
break
default:
d.variant = variantDefault
}
if d.iterations == 0 {
d.iterations = d.variant.DefaultIterations()
}
}
|
