/
sign.go
69 lines (53 loc) · 1.54 KB
/
sign.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
62
63
64
65
66
67
68
69
package sign
import (
"bytes"
"encoding/pem"
"github.com/nobuenhombre/go-crypto-gost/pkg/crypto-message/containers"
"github.com/nobuenhombre/go-crypto-gost/pkg/crypto-message/containers/certificate"
privatekey "github.com/nobuenhombre/go-crypto-gost/pkg/crypto-message/containers/private-key"
"github.com/nobuenhombre/suikat/pkg/ge"
)
type Service interface {
Sign(message []byte, publicKeyPEM, privateKeyPEM containers.PEM) (signed containers.PEM, err error)
}
type Config struct{}
func New() Service {
return &Config{}
}
func (c *Config) Sign(message []byte, publicKeyPEM, privateKeyPEM containers.PEM) (signed containers.PEM, err error) {
publicKeys, err := certificate.DecodePEM(publicKeyPEM)
if err != nil {
return nil, ge.Pin(err)
}
if len(publicKeys) == 0 {
return nil, ge.New("empty public keys")
}
publicKey := publicKeys[0]
privateKey, err := privatekey.DecodePEM(privateKeyPEM)
if err != nil {
return nil, ge.Pin(err)
}
toBeSigned, err := NewSignedData(message)
if err != nil {
return nil, ge.Pin(err)
}
err = toBeSigned.SignWithoutAttr(publicKey, privateKey, SignerInfoConfig{})
if err != nil {
return nil, ge.Pin(err)
}
// Detach signature, omit if you want an embedded signature
err = toBeSigned.Detach()
if err != nil {
return nil, ge.Pin(err)
}
signed, err = toBeSigned.Finish()
if err != nil {
return nil, ge.Pin(err)
}
var buffer bytes.Buffer
err = pem.Encode(&buffer, &pem.Block{Type: containers.Default, Bytes: signed})
if err != nil {
return nil, ge.Pin(err)
}
return buffer.Bytes(), nil
}