1 /* crypto/rc2/rc2_cbc.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
59 #include <openssl/rc2.h>
62 void RC2_cbc_encrypt(const unsigned char *in, unsigned char *out, long length,
63 RC2_KEY *ks, unsigned char *iv, int encrypt)
65 register unsigned long tin0, tin1;
66 register unsigned long tout0, tout1, xor0, xor1;
67 register long l = length;
74 for (l -= 8; l >= 0; l -= 8) {
88 c2ln(in, tin0, tin1, l + 8);
105 for (l -= 8; l >= 0; l -= 8) {
110 RC2_decrypt(tin, ks);
111 tout0 = tin[0] ^ xor0;
112 tout1 = tin[1] ^ xor1;
123 RC2_decrypt(tin, ks);
124 tout0 = tin[0] ^ xor0;
125 tout1 = tin[1] ^ xor1;
126 l2cn(tout0, tout1, out, l + 8);
133 tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0;
137 void RC2_encrypt(unsigned long *d, RC2_KEY *key)
140 register RC2_INT *p0, *p1;
141 register RC2_INT x0, x1, x2, x3, t;
145 x0 = (RC2_INT) l & 0xffff;
146 x1 = (RC2_INT) (l >> 16L);
148 x2 = (RC2_INT) l & 0xffff;
149 x3 = (RC2_INT) (l >> 16L);
154 p0 = p1 = &(key->data[0]);
156 t = (x0 + (x1 & ~x3) + (x2 & x3) + *(p0++)) & 0xffff;
157 x0 = (t << 1) | (t >> 15);
158 t = (x1 + (x2 & ~x0) + (x3 & x0) + *(p0++)) & 0xffff;
159 x1 = (t << 2) | (t >> 14);
160 t = (x2 + (x3 & ~x1) + (x0 & x1) + *(p0++)) & 0xffff;
161 x2 = (t << 3) | (t >> 13);
162 t = (x3 + (x0 & ~x2) + (x1 & x2) + *(p0++)) & 0xffff;
163 x3 = (t << 5) | (t >> 11);
168 i = (n == 2) ? 6 : 5;
178 (unsigned long)(x0 & 0xffff) | ((unsigned long)(x1 & 0xffff) << 16L);
180 (unsigned long)(x2 & 0xffff) | ((unsigned long)(x3 & 0xffff) << 16L);
183 void RC2_decrypt(unsigned long *d, RC2_KEY *key)
186 register RC2_INT *p0, *p1;
187 register RC2_INT x0, x1, x2, x3, t;
191 x0 = (RC2_INT) l & 0xffff;
192 x1 = (RC2_INT) (l >> 16L);
194 x2 = (RC2_INT) l & 0xffff;
195 x3 = (RC2_INT) (l >> 16L);
200 p0 = &(key->data[63]);
201 p1 = &(key->data[0]);
203 t = ((x3 << 11) | (x3 >> 5)) & 0xffff;
204 x3 = (t - (x0 & ~x2) - (x1 & x2) - *(p0--)) & 0xffff;
205 t = ((x2 << 13) | (x2 >> 3)) & 0xffff;
206 x2 = (t - (x3 & ~x1) - (x0 & x1) - *(p0--)) & 0xffff;
207 t = ((x1 << 14) | (x1 >> 2)) & 0xffff;
208 x1 = (t - (x2 & ~x0) - (x3 & x0) - *(p0--)) & 0xffff;
209 t = ((x0 << 15) | (x0 >> 1)) & 0xffff;
210 x0 = (t - (x1 & ~x3) - (x2 & x3) - *(p0--)) & 0xffff;
215 i = (n == 2) ? 6 : 5;
217 x3 = (x3 - p1[x2 & 0x3f]) & 0xffff;
218 x2 = (x2 - p1[x1 & 0x3f]) & 0xffff;
219 x1 = (x1 - p1[x0 & 0x3f]) & 0xffff;
220 x0 = (x0 - p1[x3 & 0x3f]) & 0xffff;
225 (unsigned long)(x0 & 0xffff) | ((unsigned long)(x1 & 0xffff) << 16L);
227 (unsigned long)(x2 & 0xffff) | ((unsigned long)(x3 & 0xffff) << 16L);