2 * Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
10 #include "internal/cryptlib.h"
13 NON_EMPTY_TRANSLATION_UNIT
16 #include <openssl/aes.h>
17 #include "aes_local.h"
19 #define N_WORDS (AES_BLOCK_SIZE / sizeof(unsigned long))
21 unsigned long data[N_WORDS];
24 /* XXX: probably some better way to do this */
25 #if defined(__i386__) || defined(__x86_64__)
26 # define UNALIGNED_MEMOPS_ARE_FAST 1
28 # define UNALIGNED_MEMOPS_ARE_FAST 0
31 #if UNALIGNED_MEMOPS_ARE_FAST
32 # define load_block(d, s) (d) = *(const aes_block_t *)(s)
33 # define store_block(d, s) *(aes_block_t *)(d) = (s)
35 # define load_block(d, s) memcpy((d).data, (s), AES_BLOCK_SIZE)
36 # define store_block(d, s) memcpy((d), (s).data, AES_BLOCK_SIZE)
39 /* N.B. The IV for this mode is _twice_ the block size */
41 /* Use of this function is deprecated. */
42 void AES_ige_encrypt(const unsigned char *in, unsigned char *out,
43 size_t length, const AES_KEY *key,
44 unsigned char *ivec, const int enc)
52 OPENSSL_assert(in && out && key && ivec);
53 OPENSSL_assert((AES_ENCRYPT == enc) || (AES_DECRYPT == enc));
54 OPENSSL_assert((length % AES_BLOCK_SIZE) == 0);
56 len = length / AES_BLOCK_SIZE;
58 if (AES_ENCRYPT == enc) {
60 (UNALIGNED_MEMOPS_ARE_FAST
61 || ((size_t)in | (size_t)out | (size_t)ivec) % sizeof(long) ==
63 aes_block_t *ivp = (aes_block_t *) ivec;
64 aes_block_t *iv2p = (aes_block_t *) (ivec + AES_BLOCK_SIZE);
67 aes_block_t *inp = (aes_block_t *) in;
68 aes_block_t *outp = (aes_block_t *) out;
70 for (n = 0; n < N_WORDS; ++n)
71 outp->data[n] = inp->data[n] ^ ivp->data[n];
72 AES_encrypt((unsigned char *)outp->data,
73 (unsigned char *)outp->data, key);
74 for (n = 0; n < N_WORDS; ++n)
75 outp->data[n] ^= iv2p->data[n];
80 out += AES_BLOCK_SIZE;
82 memcpy(ivec, ivp->data, AES_BLOCK_SIZE);
83 memcpy(ivec + AES_BLOCK_SIZE, iv2p->data, AES_BLOCK_SIZE);
85 aes_block_t tmp, tmp2;
90 load_block(iv2, ivec + AES_BLOCK_SIZE);
94 for (n = 0; n < N_WORDS; ++n)
95 tmp2.data[n] = tmp.data[n] ^ iv.data[n];
96 AES_encrypt((unsigned char *)tmp2.data,
97 (unsigned char *)tmp2.data, key);
98 for (n = 0; n < N_WORDS; ++n)
99 tmp2.data[n] ^= iv2.data[n];
100 store_block(out, tmp2);
104 in += AES_BLOCK_SIZE;
105 out += AES_BLOCK_SIZE;
107 memcpy(ivec, iv.data, AES_BLOCK_SIZE);
108 memcpy(ivec + AES_BLOCK_SIZE, iv2.data, AES_BLOCK_SIZE);
112 (UNALIGNED_MEMOPS_ARE_FAST
113 || ((size_t)in | (size_t)out | (size_t)ivec) % sizeof(long) ==
115 aes_block_t *ivp = (aes_block_t *) ivec;
116 aes_block_t *iv2p = (aes_block_t *) (ivec + AES_BLOCK_SIZE);
120 aes_block_t *inp = (aes_block_t *) in;
121 aes_block_t *outp = (aes_block_t *) out;
123 for (n = 0; n < N_WORDS; ++n)
124 tmp.data[n] = inp->data[n] ^ iv2p->data[n];
125 AES_decrypt((unsigned char *)tmp.data,
126 (unsigned char *)outp->data, key);
127 for (n = 0; n < N_WORDS; ++n)
128 outp->data[n] ^= ivp->data[n];
132 in += AES_BLOCK_SIZE;
133 out += AES_BLOCK_SIZE;
135 memcpy(ivec, ivp->data, AES_BLOCK_SIZE);
136 memcpy(ivec + AES_BLOCK_SIZE, iv2p->data, AES_BLOCK_SIZE);
138 aes_block_t tmp, tmp2;
142 load_block(iv, ivec);
143 load_block(iv2, ivec + AES_BLOCK_SIZE);
148 for (n = 0; n < N_WORDS; ++n)
149 tmp.data[n] ^= iv2.data[n];
150 AES_decrypt((unsigned char *)tmp.data,
151 (unsigned char *)tmp.data, key);
152 for (n = 0; n < N_WORDS; ++n)
153 tmp.data[n] ^= iv.data[n];
154 store_block(out, tmp);
158 in += AES_BLOCK_SIZE;
159 out += AES_BLOCK_SIZE;
161 memcpy(ivec, iv.data, AES_BLOCK_SIZE);
162 memcpy(ivec + AES_BLOCK_SIZE, iv2.data, AES_BLOCK_SIZE);
168 * Note that its effectively impossible to do biIGE in anything other
169 * than a single pass, so no provision is made for chaining.
171 * NB: The implementation of AES_bi_ige_encrypt has a bug. It is supposed to use
172 * 2 AES keys, but in fact only one is ever used. This bug has been present
173 * since this code was first implemented. It is believed to have minimal
174 * security impact in practice and has therefore not been fixed for backwards
175 * compatibility reasons.
177 * Use of this function is deprecated.
180 /* N.B. The IV for this mode is _four times_ the block size */
182 void AES_bi_ige_encrypt(const unsigned char *in, unsigned char *out,
183 size_t length, const AES_KEY *key,
184 const AES_KEY *key2, const unsigned char *ivec,
189 unsigned char tmp[AES_BLOCK_SIZE];
190 unsigned char tmp2[AES_BLOCK_SIZE];
191 unsigned char tmp3[AES_BLOCK_SIZE];
192 unsigned char prev[AES_BLOCK_SIZE];
193 const unsigned char *iv;
194 const unsigned char *iv2;
196 OPENSSL_assert(in && out && key && ivec);
197 OPENSSL_assert((AES_ENCRYPT == enc) || (AES_DECRYPT == enc));
198 OPENSSL_assert((length % AES_BLOCK_SIZE) == 0);
200 if (AES_ENCRYPT == enc) {
202 * XXX: Do a separate case for when in != out (strictly should check
206 /* First the forward pass */
208 iv2 = ivec + AES_BLOCK_SIZE;
209 while (len >= AES_BLOCK_SIZE) {
210 for (n = 0; n < AES_BLOCK_SIZE; ++n)
211 out[n] = in[n] ^ iv[n];
212 AES_encrypt(out, out, key);
213 for (n = 0; n < AES_BLOCK_SIZE; ++n)
216 memcpy(prev, in, AES_BLOCK_SIZE);
218 len -= AES_BLOCK_SIZE;
219 in += AES_BLOCK_SIZE;
220 out += AES_BLOCK_SIZE;
223 /* And now backwards */
224 iv = ivec + AES_BLOCK_SIZE * 2;
225 iv2 = ivec + AES_BLOCK_SIZE * 3;
227 while (len >= AES_BLOCK_SIZE) {
228 out -= AES_BLOCK_SIZE;
230 * XXX: reduce copies by alternating between buffers
232 memcpy(tmp, out, AES_BLOCK_SIZE);
233 for (n = 0; n < AES_BLOCK_SIZE; ++n)
236 * hexdump(stdout, "out ^ iv", out, AES_BLOCK_SIZE);
238 AES_encrypt(out, out, key);
240 * hexdump(stdout,"enc", out, AES_BLOCK_SIZE);
243 * hexdump(stdout,"iv2", iv2, AES_BLOCK_SIZE);
245 for (n = 0; n < AES_BLOCK_SIZE; ++n)
248 * hexdump(stdout,"out", out, AES_BLOCK_SIZE);
251 memcpy(prev, tmp, AES_BLOCK_SIZE);
253 len -= AES_BLOCK_SIZE;
256 /* First backwards */
257 iv = ivec + AES_BLOCK_SIZE * 2;
258 iv2 = ivec + AES_BLOCK_SIZE * 3;
261 while (len >= AES_BLOCK_SIZE) {
262 in -= AES_BLOCK_SIZE;
263 out -= AES_BLOCK_SIZE;
264 memcpy(tmp, in, AES_BLOCK_SIZE);
265 memcpy(tmp2, in, AES_BLOCK_SIZE);
266 for (n = 0; n < AES_BLOCK_SIZE; ++n)
268 AES_decrypt(tmp, out, key);
269 for (n = 0; n < AES_BLOCK_SIZE; ++n)
271 memcpy(tmp3, tmp2, AES_BLOCK_SIZE);
274 len -= AES_BLOCK_SIZE;
277 /* And now forwards */
279 iv2 = ivec + AES_BLOCK_SIZE;
281 while (len >= AES_BLOCK_SIZE) {
282 memcpy(tmp, out, AES_BLOCK_SIZE);
283 memcpy(tmp2, out, AES_BLOCK_SIZE);
284 for (n = 0; n < AES_BLOCK_SIZE; ++n)
286 AES_decrypt(tmp, out, key);
287 for (n = 0; n < AES_BLOCK_SIZE; ++n)
289 memcpy(tmp3, tmp2, AES_BLOCK_SIZE);
292 len -= AES_BLOCK_SIZE;
293 in += AES_BLOCK_SIZE;
294 out += AES_BLOCK_SIZE;