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
|
package main
import (
"crypto"
"crypto/rand"
"crypto/rsa"
"crypto/sha256"
"crypto/x509"
"encoding/base64"
"encoding/pem"
"fmt"
"os"
"strings"
)
type PublicKeyMeta struct {
ID string `json:"id"`
Owner string `json:"owner"`
PublicKey string `json:"publicKeyPem"`
}
func (u *User) getPrivateKey() (*rsa.PrivateKey, error) {
key, err := os.ReadFile("./keys/" + strings.TrimPrefix(u.UserName, "@") + ".key")
if err != nil {
return nil, err
}
block, _ := pem.Decode(key)
if block == nil {
return nil, fmt.Errorf("could not decode private key")
}
der, err := x509.ParsePKCS8PrivateKey(block.Bytes)
if err != nil {
return nil, err
}
key1, _ := der.(*rsa.PrivateKey)
return key1, err
}
func (u *User) SignBlob(fields string, stringToSign string) (string, error) {
privateKey, err := u.getPrivateKey()
if err == nil {
hashS := sha256.Sum256([]byte(stringToSign))
signature, err := rsa.SignPKCS1v15(rand.Reader, privateKey, crypto.SHA256, hashS[:])
if err == nil {
sigB64 := base64.StdEncoding.EncodeToString(signature)
actSig := fmt.Sprintf("keyId=\"%s#main-key\",algorithm=\"rsa-sha256\",headers=\"%s\",signature=\"%s\"", u.ID, fields, sigB64)
return actSig, nil
}
return "", err
}
return "", err
}
|