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
72
73
74
75
76
77
78
|
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package aes
import (
"crypto/cipher"
"crypto/internal/subtle"
"strconv"
)
// The AES block size in bytes.
const BlockSize = 16
// A cipher is an instance of AES encryption using a particular key.
type aesCipher struct {
enc []uint32
dec []uint32
}
type KeySizeError int
func (k KeySizeError) Error() string {
return "crypto/aes: invalid key size " + strconv.Itoa(int(k))
}
// NewCipher creates and returns a new cipher.Block.
// The key argument should be the AES key,
// either 16, 24, or 32 bytes to select
// AES-128, AES-192, or AES-256.
func NewCipher(key []byte) (cipher.Block, error) {
k := len(key)
switch k {
default:
return nil, KeySizeError(k)
case 16, 24, 32:
break
}
return newCipher(key)
}
// newCipherGeneric creates and returns a new cipher.Block
// implemented in pure Go.
func newCipherGeneric(key []byte) (cipher.Block, error) {
n := len(key) + 28
c := aesCipher{make([]uint32, n), make([]uint32, n)}
expandKeyGo(key, c.enc, c.dec)
return &c, nil
}
func (c *aesCipher) BlockSize() int { return BlockSize }
func (c *aesCipher) Encrypt(dst, src []byte) {
if len(src) < BlockSize {
panic("crypto/aes: input not full block")
}
if len(dst) < BlockSize {
panic("crypto/aes: output not full block")
}
if subtle.InexactOverlap(dst[:BlockSize], src[:BlockSize]) {
panic("crypto/aes: invalid buffer overlap")
}
encryptBlockGo(c.enc, dst, src)
}
func (c *aesCipher) Decrypt(dst, src []byte) {
if len(src) < BlockSize {
panic("crypto/aes: input not full block")
}
if len(dst) < BlockSize {
panic("crypto/aes: output not full block")
}
if subtle.InexactOverlap(dst[:BlockSize], src[:BlockSize]) {
panic("crypto/aes: invalid buffer overlap")
}
decryptBlockGo(c.dec, dst, src)
}
|
