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>
58 static void hexdump(FILE *f,const char *title,const unsigned char *s,int l)
62 fprintf(f,"%s",title);
66 fprintf(f,"\n%04x",n);
67 fprintf(f," %02x",s[n]);
73 /* N.B. The IV for this mode is _twice_ the block size */
75 void AES_ige_encrypt(const unsigned char *in, unsigned char *out,
76 const unsigned long length, const AES_KEY *key,
77 unsigned char *ivec, const int enc)
80 unsigned long len = length;
81 unsigned char tmp[AES_BLOCK_SIZE];
82 unsigned char tmp2[AES_BLOCK_SIZE];
83 unsigned char prev[AES_BLOCK_SIZE];
84 const unsigned char *iv = ivec;
85 const unsigned char *iv2 = ivec + AES_BLOCK_SIZE;
87 assert(in && out && key && ivec);
88 assert((AES_ENCRYPT == enc)||(AES_DECRYPT == enc));
89 assert((length%AES_BLOCK_SIZE) == 0);
91 if (AES_ENCRYPT == enc)
93 /* XXX: Do a separate case for when in != out (strictly should
94 check for overlap, too) */
95 while (len >= AES_BLOCK_SIZE)
97 // hexdump(stdout, "in", in, AES_BLOCK_SIZE);
98 // hexdump(stdout, "iv", iv, AES_BLOCK_SIZE);
99 for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
100 out[n] = in[n] ^ iv[n];
101 // hexdump(stdout, "in ^ iv", out, AES_BLOCK_SIZE);
102 AES_encrypt(out, out, key);
103 // hexdump(stdout,"enc", out, AES_BLOCK_SIZE);
104 // hexdump(stdout,"iv2", iv2, AES_BLOCK_SIZE);
105 for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
107 // hexdump(stdout,"out", out, AES_BLOCK_SIZE);
109 memcpy(prev, in, AES_BLOCK_SIZE);
111 len -= AES_BLOCK_SIZE;
112 in += AES_BLOCK_SIZE;
113 out += AES_BLOCK_SIZE;
115 memcpy(ivec, iv, AES_BLOCK_SIZE);
116 memcpy(ivec + AES_BLOCK_SIZE, iv2, AES_BLOCK_SIZE);
120 while (len >= AES_BLOCK_SIZE)
122 memcpy(tmp, in, AES_BLOCK_SIZE);
123 memcpy(tmp2, in, AES_BLOCK_SIZE);
124 // hexdump(stdout, "in", in, AES_BLOCK_SIZE);
125 // hexdump(stdout, "iv2", iv2, AES_BLOCK_SIZE);
126 for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
128 // hexdump(stdout, "in ^ iv2", tmp, AES_BLOCK_SIZE);
129 AES_decrypt(tmp, out, key);
130 // hexdump(stdout, "dec", out, AES_BLOCK_SIZE);
131 // hexdump(stdout, "iv", ivec, AES_BLOCK_SIZE);
132 for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
134 // hexdump(stdout, "out", out, AES_BLOCK_SIZE);
135 memcpy(ivec, tmp2, AES_BLOCK_SIZE);
137 len -= AES_BLOCK_SIZE;
138 in += AES_BLOCK_SIZE;
139 out += AES_BLOCK_SIZE;
141 memcpy(ivec + AES_BLOCK_SIZE, iv2, AES_BLOCK_SIZE);
146 * Note that its effectively impossible to do biIGE in anything other
147 * than a single pass, so no provision is made for chaining.
150 /* N.B. The IV for this mode is _four times_ the block size */
152 void AES_bi_ige_encrypt(const unsigned char *in, unsigned char *out,
153 const unsigned long length, const AES_KEY *key,
154 const AES_KEY *key2, const unsigned char *ivec,
158 unsigned long len = length;
159 unsigned char tmp[AES_BLOCK_SIZE];
160 unsigned char tmp2[AES_BLOCK_SIZE];
161 unsigned char tmp3[AES_BLOCK_SIZE];
162 unsigned char prev[AES_BLOCK_SIZE];
163 const unsigned char *iv;
164 const unsigned char *iv2;
166 assert(in && out && key && ivec);
167 assert((AES_ENCRYPT == enc)||(AES_DECRYPT == enc));
168 assert((length%AES_BLOCK_SIZE) == 0);
170 if (AES_ENCRYPT == enc)
172 /* XXX: Do a separate case for when in != out (strictly should
173 check for overlap, too) */
175 /* First the forward pass */
177 iv2 = ivec + AES_BLOCK_SIZE;
178 while (len >= AES_BLOCK_SIZE)
180 // hexdump(stdout, "in", in, AES_BLOCK_SIZE);
181 // hexdump(stdout, "iv", iv, AES_BLOCK_SIZE);
182 for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
183 out[n] = in[n] ^ iv[n];
184 // hexdump(stdout, "in ^ iv", out, AES_BLOCK_SIZE);
185 AES_encrypt(out, out, key);
186 // hexdump(stdout,"enc", out, AES_BLOCK_SIZE);
187 // hexdump(stdout,"iv2", iv2, AES_BLOCK_SIZE);
188 for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
190 // hexdump(stdout,"out", out, AES_BLOCK_SIZE);
192 memcpy(prev, in, AES_BLOCK_SIZE);
194 len -= AES_BLOCK_SIZE;
195 in += AES_BLOCK_SIZE;
196 out += AES_BLOCK_SIZE;
199 /* And now backwards */
200 iv = ivec + AES_BLOCK_SIZE*2;
201 iv2 = ivec + AES_BLOCK_SIZE*3;
203 while(len >= AES_BLOCK_SIZE)
205 out -= AES_BLOCK_SIZE;
206 // hexdump(stdout, "intermediate", out, AES_BLOCK_SIZE);
207 // hexdump(stdout, "iv", iv, AES_BLOCK_SIZE);
208 // XXX: reduce copies by alternating between buffers
209 memcpy(tmp, out, AES_BLOCK_SIZE);
210 for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
212 // hexdump(stdout, "out ^ iv", out, AES_BLOCK_SIZE);
213 AES_encrypt(out, out, key);
214 // hexdump(stdout,"enc", out, AES_BLOCK_SIZE);
215 // hexdump(stdout,"iv2", iv2, AES_BLOCK_SIZE);
216 for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
218 // hexdump(stdout,"out", out, AES_BLOCK_SIZE);
220 memcpy(prev, tmp, AES_BLOCK_SIZE);
222 len -= AES_BLOCK_SIZE;
227 /* First backwards */
228 iv = ivec + AES_BLOCK_SIZE*2;
229 iv2 = ivec + AES_BLOCK_SIZE*3;
232 while (len >= AES_BLOCK_SIZE)
234 in -= AES_BLOCK_SIZE;
235 out -= AES_BLOCK_SIZE;
236 memcpy(tmp, in, AES_BLOCK_SIZE);
237 memcpy(tmp2, in, AES_BLOCK_SIZE);
238 // hexdump(stdout, "in", in, AES_BLOCK_SIZE);
239 // hexdump(stdout, "iv2", iv2, AES_BLOCK_SIZE);
240 for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
242 // hexdump(stdout, "in ^ iv2", tmp, AES_BLOCK_SIZE);
243 AES_decrypt(tmp, out, key);
244 // hexdump(stdout, "dec", out, AES_BLOCK_SIZE);
245 // hexdump(stdout, "iv", iv, AES_BLOCK_SIZE);
246 for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
248 // hexdump(stdout, "out", out, AES_BLOCK_SIZE);
249 memcpy(tmp3, tmp2, AES_BLOCK_SIZE);
252 len -= AES_BLOCK_SIZE;
255 /* And now forwards */
257 iv2 = ivec + AES_BLOCK_SIZE;
259 while (len >= AES_BLOCK_SIZE)
261 memcpy(tmp, out, AES_BLOCK_SIZE);
262 memcpy(tmp2, out, AES_BLOCK_SIZE);
263 // hexdump(stdout, "intermediate", 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 ^ iv2", tmp, AES_BLOCK_SIZE);
268 AES_decrypt(tmp, out, key);
269 // hexdump(stdout, "dec", out, AES_BLOCK_SIZE);
270 // hexdump(stdout, "iv", ivec, AES_BLOCK_SIZE);
271 for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
273 // hexdump(stdout, "out", out, AES_BLOCK_SIZE);
274 memcpy(tmp3, tmp2, AES_BLOCK_SIZE);
277 len -= AES_BLOCK_SIZE;
278 in += AES_BLOCK_SIZE;
279 out += AES_BLOCK_SIZE;