/src/gnutls/lib/accelerated/x86/aes-gcm-x86-aesni.c
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1 | | /* |
2 | | * Copyright (C) 2011-2012 Free Software Foundation, Inc. |
3 | | * |
4 | | * Author: Nikos Mavrogiannopoulos |
5 | | * |
6 | | * This file is part of GnuTLS. |
7 | | * |
8 | | * The GnuTLS is free software; you can redistribute it and/or |
9 | | * modify it under the terms of the GNU Lesser General Public License |
10 | | * as published by the Free Software Foundation; either version 2.1 of |
11 | | * the License, or (at your option) any later version. |
12 | | * |
13 | | * This library is distributed in the hope that it will be useful, but |
14 | | * WITHOUT ANY WARRANTY; without even the implied warranty of |
15 | | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
16 | | * Lesser General Public License for more details. |
17 | | * |
18 | | * You should have received a copy of the GNU Lesser General Public License |
19 | | * along with this program. If not, see <https://www.gnu.org/licenses/> |
20 | | * |
21 | | */ |
22 | | |
23 | | /* |
24 | | * The following code is an implementation of the AES-128-GCM cipher |
25 | | * using AESNI (without PCLMUL) |
26 | | */ |
27 | | |
28 | | #include "errors.h" |
29 | | #include "gnutls_int.h" |
30 | | |
31 | | #ifdef HAVE_LIBNETTLE |
32 | | |
33 | | #include <gnutls/crypto.h> |
34 | | #include "errors.h" |
35 | | #include "aes-x86.h" |
36 | | #include "x86-common.h" |
37 | | #include <byteswap.h> |
38 | | #include <nettle/gcm.h> |
39 | | |
40 | | /* GCM mode |
41 | | * It is used when the CPU doesn't include the PCLMUL instructions. |
42 | | */ |
43 | | struct gcm_x86_aes_ctx { |
44 | | struct GCM_CTX(AES_KEY) inner; |
45 | | size_t rekey_counter; |
46 | | }; |
47 | | |
48 | | static void x86_aes_encrypt(const void *_ctx, size_t length, uint8_t *dst, |
49 | | const uint8_t *src) |
50 | 0 | { |
51 | 0 | AES_KEY *ctx = (void *)_ctx; |
52 | |
|
53 | 0 | aesni_ecb_encrypt(src, dst, length, ctx, 1); |
54 | 0 | } |
55 | | |
56 | | static void x86_aes128_set_encrypt_key(void *_ctx, const uint8_t *key) |
57 | 0 | { |
58 | 0 | AES_KEY *ctx = _ctx; |
59 | |
|
60 | 0 | aesni_set_encrypt_key(key, 16 * 8, ctx); |
61 | 0 | } |
62 | | |
63 | | static void x86_aes192_set_encrypt_key(void *_ctx, const uint8_t *key) |
64 | 0 | { |
65 | 0 | AES_KEY *ctx = _ctx; |
66 | |
|
67 | 0 | aesni_set_encrypt_key(key, 24 * 8, ctx); |
68 | 0 | } |
69 | | |
70 | | static void x86_aes256_set_encrypt_key(void *_ctx, const uint8_t *key) |
71 | 0 | { |
72 | 0 | AES_KEY *ctx = _ctx; |
73 | |
|
74 | 0 | aesni_set_encrypt_key(key, 32 * 8, ctx); |
75 | 0 | } |
76 | | |
77 | | static int aes_gcm_cipher_init(gnutls_cipher_algorithm_t algorithm, void **_ctx, |
78 | | int enc) |
79 | 0 | { |
80 | | /* we use key size to distinguish */ |
81 | 0 | if (algorithm != GNUTLS_CIPHER_AES_128_GCM && |
82 | 0 | algorithm != GNUTLS_CIPHER_AES_192_GCM && |
83 | 0 | algorithm != GNUTLS_CIPHER_AES_256_GCM) |
84 | 0 | return GNUTLS_E_INVALID_REQUEST; |
85 | | |
86 | 0 | *_ctx = gnutls_calloc(1, sizeof(struct gcm_x86_aes_ctx)); |
87 | 0 | if (*_ctx == NULL) { |
88 | 0 | gnutls_assert(); |
89 | 0 | return GNUTLS_E_MEMORY_ERROR; |
90 | 0 | } |
91 | | |
92 | 0 | return 0; |
93 | 0 | } |
94 | | |
95 | | static int aes_gcm_cipher_setkey(void *_ctx, const void *key, size_t length) |
96 | 0 | { |
97 | 0 | struct gcm_x86_aes_ctx *ctx = _ctx; |
98 | |
|
99 | 0 | if (length == 16) { |
100 | 0 | GCM_SET_KEY(&ctx->inner, x86_aes128_set_encrypt_key, |
101 | 0 | x86_aes_encrypt, key); |
102 | 0 | } else if (length == 24) { |
103 | 0 | GCM_SET_KEY(&ctx->inner, x86_aes192_set_encrypt_key, |
104 | 0 | x86_aes_encrypt, key); |
105 | 0 | } else if (length == 32) { |
106 | 0 | GCM_SET_KEY(&ctx->inner, x86_aes256_set_encrypt_key, |
107 | 0 | x86_aes_encrypt, key); |
108 | 0 | } else |
109 | 0 | return GNUTLS_E_INVALID_REQUEST; |
110 | | |
111 | 0 | ctx->rekey_counter = 0; |
112 | 0 | return 0; |
113 | 0 | } |
114 | | |
115 | | static int aes_gcm_setiv(void *_ctx, const void *iv, size_t iv_size) |
116 | 0 | { |
117 | 0 | struct gcm_x86_aes_ctx *ctx = _ctx; |
118 | |
|
119 | 0 | if (iv_size != GCM_BLOCK_SIZE - 4) |
120 | 0 | return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST); |
121 | | |
122 | 0 | GCM_SET_IV(&ctx->inner, iv_size, iv); |
123 | |
|
124 | 0 | ctx->rekey_counter = 0; |
125 | 0 | return 0; |
126 | 0 | } |
127 | | |
128 | | static int aes_gcm_encrypt(void *_ctx, const void *src, size_t src_size, |
129 | | void *dst, size_t length) |
130 | 0 | { |
131 | 0 | struct gcm_x86_aes_ctx *ctx = _ctx; |
132 | 0 | int ret; |
133 | |
|
134 | 0 | if (unlikely(length < src_size)) |
135 | 0 | return gnutls_assert_val(GNUTLS_E_SHORT_MEMORY_BUFFER); |
136 | | |
137 | 0 | ret = record_aes_gcm_encrypt_size(&ctx->rekey_counter, src_size); |
138 | 0 | if (ret < 0) { |
139 | 0 | return gnutls_assert_val(ret); |
140 | 0 | } |
141 | | |
142 | 0 | GCM_ENCRYPT(&ctx->inner, x86_aes_encrypt, src_size, dst, src); |
143 | |
|
144 | 0 | return 0; |
145 | 0 | } |
146 | | |
147 | | static int aes_gcm_decrypt(void *_ctx, const void *src, size_t src_size, |
148 | | void *dst, size_t dst_size) |
149 | 0 | { |
150 | 0 | struct gcm_x86_aes_ctx *ctx = _ctx; |
151 | |
|
152 | 0 | if (unlikely(dst_size < src_size)) |
153 | 0 | return gnutls_assert_val(GNUTLS_E_SHORT_MEMORY_BUFFER); |
154 | | |
155 | 0 | GCM_DECRYPT(&ctx->inner, x86_aes_encrypt, src_size, dst, src); |
156 | 0 | return 0; |
157 | 0 | } |
158 | | |
159 | | static int aes_gcm_auth(void *_ctx, const void *src, size_t src_size) |
160 | 0 | { |
161 | 0 | struct gcm_x86_aes_ctx *ctx = _ctx; |
162 | |
|
163 | 0 | GCM_UPDATE(&ctx->inner, src_size, src); |
164 | |
|
165 | 0 | return 0; |
166 | 0 | } |
167 | | |
168 | | static void aes_gcm_tag(void *_ctx, void *tag, size_t tagsize) |
169 | 0 | { |
170 | 0 | struct gcm_x86_aes_ctx *ctx = _ctx; |
171 | |
|
172 | 0 | GCM_DIGEST(&ctx->inner, x86_aes_encrypt, tagsize, tag); |
173 | 0 | } |
174 | | |
175 | | static void aes_gcm_deinit(void *_ctx) |
176 | 0 | { |
177 | 0 | struct gcm_x86_aes_ctx *ctx = _ctx; |
178 | |
|
179 | 0 | zeroize_temp_key(ctx, sizeof(*ctx)); |
180 | 0 | gnutls_free(ctx); |
181 | 0 | } |
182 | | |
183 | | #include "aes-gcm-aead.h" |
184 | | |
185 | | const gnutls_crypto_cipher_st _gnutls_aes_gcm_x86_aesni = { |
186 | | .init = aes_gcm_cipher_init, |
187 | | .setkey = aes_gcm_cipher_setkey, |
188 | | .setiv = aes_gcm_setiv, |
189 | | .aead_encrypt = aes_gcm_aead_encrypt, |
190 | | .aead_decrypt = aes_gcm_aead_decrypt, |
191 | | .encrypt = aes_gcm_encrypt, |
192 | | .decrypt = aes_gcm_decrypt, |
193 | | .deinit = aes_gcm_deinit, |
194 | | .tag = aes_gcm_tag, |
195 | | .auth = aes_gcm_auth, |
196 | | }; |
197 | | |
198 | | #endif |