-
Notifications
You must be signed in to change notification settings - Fork 0
/
generate.go
71 lines (62 loc) · 1.82 KB
/
generate.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
70
71
// Copyright (C) 2023 Shanhu Tech Inc.
//
// This program is free software: you can redistribute it and/or modify it
// under the terms of the GNU Affero General Public License as published by the
// Free Software Foundation, either version 3 of the License, or (at your
// option) any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License
// for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
package rsautil
import (
"bytes"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"golang.org/x/crypto/ssh"
)
func pemBlock(k *rsa.PrivateKey, pwd []byte) (*pem.Block, error) {
const pemType = "RSA PRIVATE KEY"
if pwd == nil {
return &pem.Block{
Type: pemType,
Bytes: x509.MarshalPKCS1PrivateKey(k),
}, nil
}
return x509.EncryptPEMBlock(
rand.Reader, pemType,
x509.MarshalPKCS1PrivateKey(k),
pwd, x509.PEMCipherDES,
)
}
// GenerateKey generates a private/public key pair with the given passphrase.
// n is the bit size of the RSA key. When n is less than 0, 4096 is used.
func GenerateKey(passphrase []byte, n int) (pri, pub []byte, err error) {
if n <= 0 {
n = 4096
}
key, err := rsa.GenerateKey(rand.Reader, n)
if err != nil {
return nil, nil, err
}
b, err := pemBlock(key, passphrase)
if err != nil {
return nil, nil, err
}
priBuf := new(bytes.Buffer)
if err := pem.Encode(priBuf, b); err != nil {
return nil, nil, err
}
pubKey, err := ssh.NewPublicKey(&key.PublicKey)
if err != nil {
return nil, nil, err
}
pub = ssh.MarshalAuthorizedKey(pubKey)
return priBuf.Bytes(), pub, nil
}