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More IGE speedup.
[thirdparty/openssl.git] / crypto / aes / aes_ige.c
1 /* crypto/aes/aes_ige.c -*- mode:C; c-file-style: "eay" -*- */
2 /* ====================================================================
3 * Copyright (c) 2006 The OpenSSL Project. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in
14 * the documentation and/or other materials provided with the
15 * distribution.
16 *
17 * 3. All advertising materials mentioning features or use of this
18 * software must display the following acknowledgment:
19 * "This product includes software developed by the OpenSSL Project
20 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
21 *
22 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
23 * endorse or promote products derived from this software without
24 * prior written permission. For written permission, please contact
25 * openssl-core@openssl.org.
26 *
27 * 5. Products derived from this software may not be called "OpenSSL"
28 * nor may "OpenSSL" appear in their names without prior written
29 * permission of the OpenSSL Project.
30 *
31 * 6. Redistributions of any form whatsoever must retain the following
32 * acknowledgment:
33 * "This product includes software developed by the OpenSSL Project
34 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
35 *
36 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
37 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
38 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
39 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
40 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
41 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
42 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
43 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
44 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
45 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
46 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
47 * OF THE POSSIBILITY OF SUCH DAMAGE.
48 * ====================================================================
49 *
50 */
51
52 #include "cryptlib.h"
53
54 #include <openssl/aes.h>
55 #include "aes_locl.h"
56
57 #define N_WORDS (AES_BLOCK_SIZE / sizeof(unsigned long))
58 typedef struct {
59 unsigned long data[N_WORDS];
60 } aes_block_t;
61
62 // XXX: probably some better way to do this
63 #if defined(__i386__) || defined(__x86_64__)
64 #define UNALIGNED_MEMOPS_ARE_FAST 1
65 #endif
66
67 #ifdef UNALIGNED_MEMOPS_ARE_FAST
68 #define load_block(d, s) (d) = *(const aes_block_t *)(s)
69 #define store_block(d, s) *(aes_block_t *)(d) = (s)
70 #else
71 #define load_block(d, s) memcpy((d).data, (s), AES_BLOCK_SIZE)
72 #define store_block(d, s) memcpy((d), (s).data, AES_BLOCK_SIZE)
73 #endif
74
75 /* N.B. The IV for this mode is _twice_ the block size */
76
77 void AES_ige_encrypt(const unsigned char *in, unsigned char *out,
78 const unsigned long length, const AES_KEY *key,
79 unsigned char *ivec, const int enc)
80 {
81 unsigned long n;
82 unsigned long len;
83
84 OPENSSL_assert(in && out && key && ivec);
85 OPENSSL_assert((AES_ENCRYPT == enc)||(AES_DECRYPT == enc));
86 OPENSSL_assert((length%AES_BLOCK_SIZE) == 0);
87
88 len = length / AES_BLOCK_SIZE;
89
90 if (AES_ENCRYPT == enc)
91 {
92 if (in != out)
93 {
94 aes_block_t *ivp = (aes_block_t *)ivec;
95 aes_block_t *iv2p = (aes_block_t *)(ivec + AES_BLOCK_SIZE);
96
97 while (len)
98 {
99 aes_block_t *inp = (aes_block_t *)in;
100 aes_block_t *outp = (aes_block_t *)out;
101
102 for(n=0 ; n < N_WORDS; ++n)
103 outp->data[n] = inp->data[n] ^ ivp->data[n];
104 AES_encrypt((unsigned char *)outp->data, (unsigned char *)outp->data, key);
105 for(n=0 ; n < N_WORDS; ++n)
106 outp->data[n] ^= iv2p->data[n];
107 ivp = outp;
108 iv2p = inp;
109 --len;
110 in += AES_BLOCK_SIZE;
111 out += AES_BLOCK_SIZE;
112 }
113 memcpy(ivec, ivp->data, AES_BLOCK_SIZE);
114 memcpy(ivec + AES_BLOCK_SIZE, iv2p->data, AES_BLOCK_SIZE);
115 }
116 else
117 {
118 aes_block_t tmp, tmp2;
119 aes_block_t iv;
120 aes_block_t iv2;
121
122 load_block(iv, ivec);
123 load_block(iv2, ivec + AES_BLOCK_SIZE);
124
125 while (len)
126 {
127 load_block(tmp, in);
128 for(n=0 ; n < N_WORDS; ++n)
129 tmp2.data[n] = tmp.data[n] ^ iv.data[n];
130 AES_encrypt((unsigned char *)tmp2.data, (unsigned char *)tmp2.data, key);
131 for(n=0 ; n < N_WORDS; ++n)
132 tmp2.data[n] ^= iv2.data[n];
133 store_block(out, tmp2);
134 iv = tmp2;
135 iv2 = tmp;
136 --len;
137 in += AES_BLOCK_SIZE;
138 out += AES_BLOCK_SIZE;
139 }
140 memcpy(ivec, iv.data, AES_BLOCK_SIZE);
141 memcpy(ivec + AES_BLOCK_SIZE, iv2.data, AES_BLOCK_SIZE);
142 }
143 }
144 else
145 {
146 if(in != out)
147 {
148 aes_block_t *ivp = (aes_block_t *)ivec;
149 aes_block_t *iv2p = (aes_block_t *)(ivec + AES_BLOCK_SIZE);
150
151 while (len)
152 {
153 aes_block_t tmp;
154 aes_block_t *inp = (aes_block_t *)in;
155 aes_block_t *outp = (aes_block_t *)out;
156
157 for(n=0 ; n < N_WORDS; ++n)
158 tmp.data[n] = inp->data[n] ^ iv2p->data[n];
159 AES_decrypt((unsigned char *)tmp.data, (unsigned char *)outp->data, key);
160 for(n=0 ; n < N_WORDS; ++n)
161 outp->data[n] ^= ivp->data[n];
162 ivp = inp;
163 iv2p = outp;
164 --len;
165 in += AES_BLOCK_SIZE;
166 out += AES_BLOCK_SIZE;
167 }
168 memcpy(ivec, ivp->data, AES_BLOCK_SIZE);
169 memcpy(ivec + AES_BLOCK_SIZE, iv2p->data, AES_BLOCK_SIZE);
170 }
171 else
172 {
173 aes_block_t tmp, tmp2;
174 aes_block_t iv;
175 aes_block_t iv2;
176
177 load_block(iv, ivec);
178 load_block(iv2, ivec + AES_BLOCK_SIZE);
179
180 while (len)
181 {
182 load_block(tmp, in);
183 tmp2 = tmp;
184 for(n=0 ; n < N_WORDS; ++n)
185 tmp.data[n] ^= iv2.data[n];
186 AES_decrypt((unsigned char *)tmp.data, (unsigned char *)tmp.data, key);
187 for(n=0 ; n < N_WORDS; ++n)
188 tmp.data[n] ^= iv.data[n];
189 store_block(out, tmp);
190 iv = tmp2;
191 iv2 = tmp;
192 --len;
193 in += AES_BLOCK_SIZE;
194 out += AES_BLOCK_SIZE;
195 }
196 memcpy(ivec, iv.data, AES_BLOCK_SIZE);
197 memcpy(ivec + AES_BLOCK_SIZE, iv2.data, AES_BLOCK_SIZE);
198 }
199 }
200 }
201
202 /*
203 * Note that its effectively impossible to do biIGE in anything other
204 * than a single pass, so no provision is made for chaining.
205 */
206
207 /* N.B. The IV for this mode is _four times_ the block size */
208
209 void AES_bi_ige_encrypt(const unsigned char *in, unsigned char *out,
210 const unsigned long length, const AES_KEY *key,
211 const AES_KEY *key2, const unsigned char *ivec,
212 const int enc)
213 {
214 unsigned long n;
215 unsigned long len = length;
216 unsigned char tmp[AES_BLOCK_SIZE];
217 unsigned char tmp2[AES_BLOCK_SIZE];
218 unsigned char tmp3[AES_BLOCK_SIZE];
219 unsigned char prev[AES_BLOCK_SIZE];
220 const unsigned char *iv;
221 const unsigned char *iv2;
222
223 OPENSSL_assert(in && out && key && ivec);
224 OPENSSL_assert((AES_ENCRYPT == enc)||(AES_DECRYPT == enc));
225 OPENSSL_assert((length%AES_BLOCK_SIZE) == 0);
226
227 if (AES_ENCRYPT == enc)
228 {
229 /* XXX: Do a separate case for when in != out (strictly should
230 check for overlap, too) */
231
232 /* First the forward pass */
233 iv = ivec;
234 iv2 = ivec + AES_BLOCK_SIZE;
235 while (len >= AES_BLOCK_SIZE)
236 {
237 for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
238 out[n] = in[n] ^ iv[n];
239 AES_encrypt(out, out, key);
240 for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
241 out[n] ^= iv2[n];
242 iv = out;
243 memcpy(prev, in, AES_BLOCK_SIZE);
244 iv2 = prev;
245 len -= AES_BLOCK_SIZE;
246 in += AES_BLOCK_SIZE;
247 out += AES_BLOCK_SIZE;
248 }
249
250 /* And now backwards */
251 iv = ivec + AES_BLOCK_SIZE*2;
252 iv2 = ivec + AES_BLOCK_SIZE*3;
253 len = length;
254 while(len >= AES_BLOCK_SIZE)
255 {
256 out -= AES_BLOCK_SIZE;
257 /* XXX: reduce copies by alternating between buffers */
258 memcpy(tmp, out, AES_BLOCK_SIZE);
259 for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
260 out[n] ^= iv[n];
261 /* hexdump(stdout, "out ^ iv", out, AES_BLOCK_SIZE); */
262 AES_encrypt(out, out, key);
263 /* hexdump(stdout,"enc", out, AES_BLOCK_SIZE); */
264 /* hexdump(stdout,"iv2", iv2, AES_BLOCK_SIZE); */
265 for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
266 out[n] ^= iv2[n];
267 /* hexdump(stdout,"out", out, AES_BLOCK_SIZE); */
268 iv = out;
269 memcpy(prev, tmp, AES_BLOCK_SIZE);
270 iv2 = prev;
271 len -= AES_BLOCK_SIZE;
272 }
273 }
274 else
275 {
276 /* First backwards */
277 iv = ivec + AES_BLOCK_SIZE*2;
278 iv2 = ivec + AES_BLOCK_SIZE*3;
279 in += length;
280 out += length;
281 while (len >= AES_BLOCK_SIZE)
282 {
283 in -= AES_BLOCK_SIZE;
284 out -= AES_BLOCK_SIZE;
285 memcpy(tmp, in, AES_BLOCK_SIZE);
286 memcpy(tmp2, in, AES_BLOCK_SIZE);
287 for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
288 tmp[n] ^= iv2[n];
289 AES_decrypt(tmp, out, key);
290 for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
291 out[n] ^= iv[n];
292 memcpy(tmp3, tmp2, AES_BLOCK_SIZE);
293 iv = tmp3;
294 iv2 = out;
295 len -= AES_BLOCK_SIZE;
296 }
297
298 /* And now forwards */
299 iv = ivec;
300 iv2 = ivec + AES_BLOCK_SIZE;
301 len = length;
302 while (len >= AES_BLOCK_SIZE)
303 {
304 memcpy(tmp, out, AES_BLOCK_SIZE);
305 memcpy(tmp2, out, AES_BLOCK_SIZE);
306 for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
307 tmp[n] ^= iv2[n];
308 AES_decrypt(tmp, out, key);
309 for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
310 out[n] ^= iv[n];
311 memcpy(tmp3, tmp2, AES_BLOCK_SIZE);
312 iv = tmp3;
313 iv2 = out;
314 len -= AES_BLOCK_SIZE;
315 in += AES_BLOCK_SIZE;
316 out += AES_BLOCK_SIZE;
317 }
318 }
319 }
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