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
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
|
/*
* Copyright (C) 2011-2012 Free Software Foundation, Inc.
* Copyright (C) 2020 Red Hat, Inc.
*
* Authors: Nikos Mavrogiannopoulos, Anderson Toshiyuki Sasaki
*
* This file is part of GnuTLS.
*
* The GnuTLS is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>
*
*/
/*
* The following code wraps the CRYPTOGAMS implementation of the AES-XTS cipher
* using Intel's AES instruction set.
*/
#include "errors.h"
#include "gnutls_int.h"
#include "fips.h"
#include <gnutls/crypto.h>
#include <aes-x86.h>
#include <x86-common.h>
struct x86_aes_xts_ctx {
AES_KEY block_key;
AES_KEY tweak_key;
uint8_t iv[16];
int enc;
};
static int
x86_aes_xts_cipher_init(gnutls_cipher_algorithm_t algorithm, void **_ctx,
int enc)
{
if (algorithm != GNUTLS_CIPHER_AES_128_XTS &&
algorithm != GNUTLS_CIPHER_AES_256_XTS)
return GNUTLS_E_INVALID_REQUEST;
*_ctx = gnutls_calloc(1, sizeof(struct x86_aes_xts_ctx));
if (*_ctx == NULL) {
gnutls_assert();
return GNUTLS_E_MEMORY_ERROR;
}
((struct x86_aes_xts_ctx *) (*_ctx))->enc = enc;
return 0;
}
static int
x86_aes_xts_cipher_setkey(void *_ctx, const void *userkey, size_t keysize)
{
struct x86_aes_xts_ctx *ctx = _ctx;
int ret;
size_t keybits;
const uint8_t *key = userkey;
if ((keysize != 32) && (keysize != 64))
return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
/* Check key block according to FIPS-140-2 IG A.9 */
if (_gnutls_fips_mode_enabled()){
if (safe_memcmp(key, key + (keysize / 2), keysize / 2) == 0) {
_gnutls_switch_lib_state(LIB_STATE_ERROR);
return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
}
}
/* Size in bits of each half for block and tweak (=keysize * 8 / 2) */
keybits = keysize * 4;
if (ctx->enc)
ret =
aesni_set_encrypt_key(key, keybits,
ALIGN16(&ctx->block_key));
else
ret =
aesni_set_decrypt_key(key, keybits,
ALIGN16(&ctx->block_key));
if (ret != 0)
return gnutls_assert_val(GNUTLS_E_ENCRYPTION_FAILED);
ret =
aesni_set_encrypt_key(key + (keysize / 2), keybits,
ALIGN16(&ctx->tweak_key));
if (ret != 0)
return gnutls_assert_val(GNUTLS_E_ENCRYPTION_FAILED);
return 0;
}
static int x86_aes_xts_setiv(void *_ctx, const void *iv, size_t iv_size)
{
struct x86_aes_xts_ctx *ctx = _ctx;
if (iv_size != 16)
return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
memcpy(ctx->iv, iv, 16);
return 0;
}
static int
x86_aes_xts_encrypt(void *_ctx, const void *src, size_t src_size,
void *dst, size_t dst_size)
{
struct x86_aes_xts_ctx *ctx = _ctx;
if (src_size < 16)
return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
aesni_xts_encrypt(src, dst, src_size, ALIGN16(&ctx->block_key),
ALIGN16(&ctx->tweak_key), ctx->iv);
return 0;
}
static int
x86_aes_xts_decrypt(void *_ctx, const void *src, size_t src_size,
void *dst, size_t dst_size)
{
struct x86_aes_xts_ctx *ctx = _ctx;
if (src_size < 16)
return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
aesni_xts_decrypt(src, dst, src_size, ALIGN16(&ctx->block_key),
ALIGN16(&ctx->tweak_key), ctx->iv);
return 0;
}
static void x86_aes_xts_deinit(void *_ctx)
{
struct x86_aes_xts_ctx *ctx = _ctx;
zeroize_temp_key(ctx, sizeof(*ctx));
gnutls_free(ctx);
}
const gnutls_crypto_cipher_st _gnutls_aes_xts_x86_aesni = {
.init = x86_aes_xts_cipher_init,
.setkey = x86_aes_xts_cipher_setkey,
.setiv = x86_aes_xts_setiv,
.encrypt = x86_aes_xts_encrypt,
.decrypt = x86_aes_xts_decrypt,
.deinit = x86_aes_xts_deinit,
};
|
