1 /* crypto/aes/aes_ige.c -*- mode:C; c-file-style: "eay" -*- */
2 /* ====================================================================
3 * Copyright (c) 2006 The OpenSSL Project. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
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
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/)"
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.
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.
31 * 6. Redistributions of any form whatsoever must retain the following
33 * "This product includes software developed by the OpenSSL Project
34 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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 * ====================================================================
54 #include <openssl/aes.h>
57 #define N_WORDS (AES_BLOCK_SIZE / sizeof(unsigned long))
59 unsigned long data[N_WORDS];
62 // XXX: probably some better way to do this
63 #if defined(__i386__) || defined(__x86_64__)
64 #define UNALIGNED_MEMOPS_ARE_FAST 1
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)
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)
75 /* N.B. The IV for this mode is _twice_ the block size */
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)
84 OPENSSL_assert(in && out && key && ivec);
85 OPENSSL_assert((AES_ENCRYPT == enc)||(AES_DECRYPT == enc));
86 OPENSSL_assert((length%AES_BLOCK_SIZE) == 0);
88 len = length / AES_BLOCK_SIZE;
90 if (AES_ENCRYPT == enc)
94 aes_block_t *ivp = (aes_block_t *)ivec;
95 aes_block_t *iv2p = (aes_block_t *)(ivec + AES_BLOCK_SIZE);
99 aes_block_t *inp = (aes_block_t *)in;
100 aes_block_t *outp = (aes_block_t *)out;
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];
110 in += AES_BLOCK_SIZE;
111 out += AES_BLOCK_SIZE;
113 memcpy(ivec, ivp->data, AES_BLOCK_SIZE);
114 memcpy(ivec + AES_BLOCK_SIZE, iv2p->data, AES_BLOCK_SIZE);
118 aes_block_t tmp, tmp2;
122 load_block(iv, ivec);
123 load_block(iv2, ivec + AES_BLOCK_SIZE);
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);
137 in += AES_BLOCK_SIZE;
138 out += AES_BLOCK_SIZE;
140 memcpy(ivec, iv.data, AES_BLOCK_SIZE);
141 memcpy(ivec + AES_BLOCK_SIZE, iv2.data, AES_BLOCK_SIZE);
148 aes_block_t *ivp = (aes_block_t *)ivec;
149 aes_block_t *iv2p = (aes_block_t *)(ivec + AES_BLOCK_SIZE);
154 aes_block_t *inp = (aes_block_t *)in;
155 aes_block_t *outp = (aes_block_t *)out;
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];
165 in += AES_BLOCK_SIZE;
166 out += AES_BLOCK_SIZE;
168 memcpy(ivec, ivp->data, AES_BLOCK_SIZE);
169 memcpy(ivec + AES_BLOCK_SIZE, iv2p->data, AES_BLOCK_SIZE);
173 aes_block_t tmp, tmp2;
177 load_block(iv, ivec);
178 load_block(iv2, ivec + AES_BLOCK_SIZE);
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);
193 in += AES_BLOCK_SIZE;
194 out += AES_BLOCK_SIZE;
196 memcpy(ivec, iv.data, AES_BLOCK_SIZE);
197 memcpy(ivec + AES_BLOCK_SIZE, iv2.data, AES_BLOCK_SIZE);
203 * Note that its effectively impossible to do biIGE in anything other
204 * than a single pass, so no provision is made for chaining.
207 /* N.B. The IV for this mode is _four times_ the block size */
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,
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;
223 OPENSSL_assert(in && out && key && ivec);
224 OPENSSL_assert((AES_ENCRYPT == enc)||(AES_DECRYPT == enc));
225 OPENSSL_assert((length%AES_BLOCK_SIZE) == 0);
227 if (AES_ENCRYPT == enc)
229 /* XXX: Do a separate case for when in != out (strictly should
230 check for overlap, too) */
232 /* First the forward pass */
234 iv2 = ivec + AES_BLOCK_SIZE;
235 while (len >= AES_BLOCK_SIZE)
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)
243 memcpy(prev, in, AES_BLOCK_SIZE);
245 len -= AES_BLOCK_SIZE;
246 in += AES_BLOCK_SIZE;
247 out += AES_BLOCK_SIZE;
250 /* And now backwards */
251 iv = ivec + AES_BLOCK_SIZE*2;
252 iv2 = ivec + AES_BLOCK_SIZE*3;
254 while(len >= AES_BLOCK_SIZE)
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)
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)
267 /* hexdump(stdout,"out", out, AES_BLOCK_SIZE); */
269 memcpy(prev, tmp, AES_BLOCK_SIZE);
271 len -= AES_BLOCK_SIZE;
276 /* First backwards */
277 iv = ivec + AES_BLOCK_SIZE*2;
278 iv2 = ivec + AES_BLOCK_SIZE*3;
281 while (len >= AES_BLOCK_SIZE)
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)
289 AES_decrypt(tmp, out, key);
290 for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
292 memcpy(tmp3, tmp2, AES_BLOCK_SIZE);
295 len -= AES_BLOCK_SIZE;
298 /* And now forwards */
300 iv2 = ivec + AES_BLOCK_SIZE;
302 while (len >= AES_BLOCK_SIZE)
304 memcpy(tmp, out, AES_BLOCK_SIZE);
305 memcpy(tmp2, out, AES_BLOCK_SIZE);
306 for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
308 AES_decrypt(tmp, out, key);
309 for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
311 memcpy(tmp3, tmp2, AES_BLOCK_SIZE);
314 len -= AES_BLOCK_SIZE;
315 in += AES_BLOCK_SIZE;
316 out += AES_BLOCK_SIZE;