blob: c6b68691a9b9de75c36dbe3f271f25750aad5a72 (
plain)
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
|
package cryptocore
import (
"crypto/cipher"
"crypto/aes"
"fmt"
)
const (
KeyLen = 32 // AES-256
AuthTagLen = 16
)
type CryptoCore struct {
BlockCipher cipher.Block
Gcm cipher.AEAD
GcmIVGen *nonceGenerator
IVLen int
}
func New(key []byte, useOpenssl bool, GCMIV128 bool) *CryptoCore {
if len(key) != KeyLen {
panic(fmt.Sprintf("Unsupported key length %d", len(key)))
}
// We want the IV size in bytes
IVLen := 96 / 8
if GCMIV128 {
IVLen = 128 / 8
}
// We always use built-in Go crypto for blockCipher because it is not
// performance-critical.
blockCipher, err := aes.NewCipher(key)
if err != nil {
panic(err)
}
var gcm cipher.AEAD
if useOpenssl {
gcm = opensslGCM{key}
} else {
gcm, err = goGCMWrapper(blockCipher, IVLen)
if err != nil {
panic(err)
}
}
return &CryptoCore{
BlockCipher: blockCipher,
Gcm: gcm,
GcmIVGen: &nonceGenerator{nonceLen: IVLen},
IVLen: IVLen,
}
}
|
