-
Notifications
You must be signed in to change notification settings - Fork 0
/
md5.go
61 lines (45 loc) · 1.12 KB
/
md5.go
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
package a5gchecksums
import (
"bytes"
"crypto/md5"
"encoding/hex"
"github.com/pkg/errors"
)
func NewMD5(toCheck []byte, secretKey string) (string, error) {
if secretKey == "" {
return "", errors.WithStack(ErrSecretKeyEmpty)
}
buf := bytes.NewBuffer(toCheck)
_, err := buf.WriteString(secretKey)
if err != nil {
return "", errors.WithStack(err)
}
a := md5.Sum(buf.Bytes())
if len(toCheck) == 0 {
return hex.EncodeToString(a[:]), errors.WithStack(ErrPayloadEmpty)
}
return hex.EncodeToString(a[:]), nil
}
func NewMD5Salted(toCheck []byte, secretKey, checksumSalt string) (
string, error) {
if secretKey == "" {
return "", errors.WithStack(ErrSecretKeyEmpty)
}
if checksumSalt == "" {
return "", errors.New("missing salt")
}
buf := bytes.NewBuffer(toCheck)
_, err := buf.WriteString(checksumSalt)
if err != nil {
return "", errors.WithStack(err)
}
_, err = buf.WriteString(secretKey)
if err != nil {
return "", errors.WithStack(err)
}
a := md5.Sum(buf.Bytes())
if len(toCheck) == 0 {
return hex.EncodeToString(a[:]), errors.WithStack(ErrPayloadEmpty)
}
return hex.EncodeToString(a[:]), nil
}