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
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
|
/*
* Copyright (C) 2014-2016 Red Hat, Inc.
*
* Author: Nikos Mavrogiannopoulos
*
* 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 is an implementation of the AES-128-CCM cipher
* on aarch64.
*/
#include "errors.h"
#include "gnutls_int.h"
#ifdef HAVE_LIBNETTLE
#include <gnutls/crypto.h>
#include "errors.h"
#include <aarch64-common.h>
#include <byteswap.h>
#include <nettle/ccm.h>
#include <aes-aarch64.h>
#include <fips.h>
typedef struct ccm_aarch64_aes_ctx {
AES_KEY key;
} ccm_aarch64_aes_ctx;
/* CCM mode
*/
static void aarch64_aes_encrypt(const void *_ctx, size_t length, uint8_t *dst,
const uint8_t *src)
{
AES_KEY *ctx = (void *)_ctx;
unsigned i;
for (i = 0; i < length; i += 16) {
aes_v8_encrypt(src, dst, ctx);
src += 16;
dst += 16;
}
}
static int aes_ccm_cipher_init(gnutls_cipher_algorithm_t algorithm, void **ctx,
int enc)
{
/* we use key size to distinguish */
if (algorithm != GNUTLS_CIPHER_AES_128_CCM &&
algorithm != GNUTLS_CIPHER_AES_256_CCM &&
algorithm != GNUTLS_CIPHER_AES_128_CCM_8 &&
algorithm != GNUTLS_CIPHER_AES_256_CCM_8)
return GNUTLS_E_INVALID_REQUEST;
*ctx = gnutls_calloc(1, sizeof(ccm_aarch64_aes_ctx));
if (*ctx == NULL) {
gnutls_assert();
return GNUTLS_E_MEMORY_ERROR;
}
return 0;
}
static int aes_ccm_cipher_setkey(void *_ctx, const void *key, size_t length)
{
struct ccm_aarch64_aes_ctx *ctx = _ctx;
CHECK_AES_KEYSIZE(length);
aes_v8_set_encrypt_key(key, length * 8, &ctx->key);
return 0;
}
static int aes_ccm_aead_encrypt(void *_ctx, const void *nonce,
size_t nonce_size, const void *auth,
size_t auth_size, size_t tag_size,
const void *plain, size_t plain_size,
void *encr, size_t encr_size)
{
struct ccm_aarch64_aes_ctx *ctx = _ctx;
/* proper AEAD cipher */
if (unlikely(encr_size < plain_size + tag_size))
return gnutls_assert_val(GNUTLS_E_SHORT_MEMORY_BUFFER);
/* SP800-38C A.1 says Tlen must be a multiple of 16 between 32
* and 128.
*/
switch (tag_size) {
case 4:
case 6:
/* SP800-38C B.2 says Tlen smaller than 64 should not be used
* under sufficient restriction. We simply allow those for now.
*/
FALLTHROUGH;
case 8:
case 10:
case 12:
case 14:
case 16:
break;
default:
if (_gnutls_fips_mode_enabled()) {
_gnutls_switch_fips_state(GNUTLS_FIPS140_OP_ERROR);
return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
}
break;
}
ccm_encrypt_message(&ctx->key, aarch64_aes_encrypt, nonce_size, nonce,
auth_size, auth, tag_size, plain_size + tag_size,
encr, plain);
return 0;
}
static int aes_ccm_aead_decrypt(void *_ctx, const void *nonce,
size_t nonce_size, const void *auth,
size_t auth_size, size_t tag_size,
const void *encr, size_t encr_size, void *plain,
size_t plain_size)
{
struct ccm_aarch64_aes_ctx *ctx = _ctx;
int ret;
if (unlikely(encr_size < tag_size))
return gnutls_assert_val(GNUTLS_E_DECRYPTION_FAILED);
if (unlikely(plain_size < encr_size - tag_size))
return gnutls_assert_val(GNUTLS_E_SHORT_MEMORY_BUFFER);
/* SP800-38C A.1 says Tlen must be a multiple of 16 between 32
* and 128.
*/
switch (tag_size) {
case 4:
case 6:
/* SP800-38C B.2 says Tlen smaller than 64 should not be used
* under sufficient restriction. We simply allow those for now.
*/
FALLTHROUGH;
case 8:
case 10:
case 12:
case 14:
case 16:
break;
default:
if (_gnutls_fips_mode_enabled()) {
_gnutls_switch_fips_state(GNUTLS_FIPS140_OP_ERROR);
return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
}
break;
}
ret = ccm_decrypt_message(&ctx->key, aarch64_aes_encrypt, nonce_size,
nonce, auth_size, auth, tag_size,
encr_size - tag_size, plain, encr);
if (unlikely(ret == 0))
return gnutls_assert_val(GNUTLS_E_DECRYPTION_FAILED);
return 0;
}
static void aes_ccm_deinit(void *_ctx)
{
struct ccm_aarch64_aes_ctx *ctx = _ctx;
zeroize_temp_key(ctx, sizeof(*ctx));
gnutls_free(ctx);
}
const gnutls_crypto_cipher_st _gnutls_aes_ccm_aarch64 = {
.init = aes_ccm_cipher_init,
.setkey = aes_ccm_cipher_setkey,
.aead_encrypt = aes_ccm_aead_encrypt,
.aead_decrypt = aes_ccm_aead_decrypt,
.deinit = aes_ccm_deinit,
};
#endif
|
