1 /* $OpenBSD: rc2_cbc.c,v 1.8 2023/07/07 13:40:44 beck Exp $ */ 2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 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. 8 * 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). 15 * 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. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 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)" 40 * 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 51 * SUCH DAMAGE. 52 * 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.] 57 */ 58 59 #include <openssl/rc2.h> 60 #include "rc2_local.h" 61 62 void 63 RC2_cbc_encrypt(const unsigned char *in, unsigned char *out, long length, 64 RC2_KEY *ks, unsigned char *iv, int encrypt) 65 { 66 unsigned long tin0, tin1; 67 unsigned long tout0, tout1, xor0, xor1; 68 long l = length; 69 unsigned long tin[2]; 70 71 if (encrypt) { 72 c2l(iv, tout0); 73 c2l(iv, tout1); 74 iv -= 8; 75 for (l -= 8; l >= 0; l -= 8) 76 { 77 c2l(in, tin0); 78 c2l(in, tin1); 79 tin0 ^= tout0; 80 tin1 ^= tout1; 81 tin[0] = tin0; 82 tin[1] = tin1; 83 RC2_encrypt(tin, ks); 84 tout0 = tin[0]; 85 l2c(tout0, out); 86 tout1 = tin[1]; 87 l2c(tout1, out); 88 } 89 if (l != -8) { 90 c2ln(in, tin0, tin1, l + 8); 91 tin0 ^= tout0; 92 tin1 ^= tout1; 93 tin[0] = tin0; 94 tin[1] = tin1; 95 RC2_encrypt(tin, ks); 96 tout0 = tin[0]; 97 l2c(tout0, out); 98 tout1 = tin[1]; 99 l2c(tout1, out); 100 } 101 l2c(tout0, iv); 102 l2c(tout1, iv); 103 } else { 104 c2l(iv, xor0); 105 c2l(iv, xor1); 106 iv -= 8; 107 for (l -= 8; l >= 0; l -= 8) 108 { 109 c2l(in, tin0); 110 tin[0] = tin0; 111 c2l(in, tin1); 112 tin[1] = tin1; 113 RC2_decrypt(tin, ks); 114 tout0 = tin[0] ^ xor0; 115 tout1 = tin[1] ^ xor1; 116 l2c(tout0, out); 117 l2c(tout1, out); 118 xor0 = tin0; 119 xor1 = tin1; 120 } 121 if (l != -8) { 122 c2l(in, tin0); 123 tin[0] = tin0; 124 c2l(in, tin1); 125 tin[1] = tin1; 126 RC2_decrypt(tin, ks); 127 tout0 = tin[0] ^ xor0; 128 tout1 = tin[1] ^ xor1; 129 l2cn(tout0, tout1, out, l + 8); 130 xor0 = tin0; 131 xor1 = tin1; 132 } 133 l2c(xor0, iv); 134 l2c(xor1, iv); 135 } 136 tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0; 137 tin[0] = tin[1] = 0; 138 } 139 LCRYPTO_ALIAS(RC2_cbc_encrypt); 140 141 void 142 RC2_encrypt(unsigned long *d, RC2_KEY *key) 143 { 144 int i, n; 145 RC2_INT *p0, *p1; 146 RC2_INT x0, x1, x2, x3, t; 147 unsigned long l; 148 149 l = d[0]; 150 x0 = (RC2_INT)l & 0xffff; 151 x1 = (RC2_INT)(l >> 16L); 152 l = d[1]; 153 x2 = (RC2_INT)l & 0xffff; 154 x3 = (RC2_INT)(l >> 16L); 155 156 n = 3; 157 i = 5; 158 159 p0 = p1 = &(key->data[0]); 160 for (;;) { 161 t = (x0 + (x1 & ~x3) + (x2 & x3) + *(p0++)) & 0xffff; 162 x0 = (t << 1)|(t >> 15); 163 t = (x1 + (x2 & ~x0) + (x3 & x0) + *(p0++)) & 0xffff; 164 x1 = (t << 2)|(t >> 14); 165 t = (x2 + (x3 & ~x1) + (x0 & x1) + *(p0++)) & 0xffff; 166 x2 = (t << 3)|(t >> 13); 167 t = (x3 + (x0 & ~x2) + (x1 & x2) + *(p0++)) & 0xffff; 168 x3 = (t << 5)|(t >> 11); 169 170 if (--i == 0) { 171 if (--n == 0) 172 break; 173 i = (n == 2) ? 6 : 5; 174 175 x0 += p1[x3 & 0x3f]; 176 x1 += p1[x0 & 0x3f]; 177 x2 += p1[x1 & 0x3f]; 178 x3 += p1[x2 & 0x3f]; 179 } 180 } 181 182 d[0] = (unsigned long)(x0 & 0xffff)|((unsigned long)(x1 & 0xffff) << 183 16L); 184 d[1] = (unsigned long)(x2 & 0xffff)|((unsigned long)(x3 & 0xffff) << 185 16L); 186 } 187 LCRYPTO_ALIAS(RC2_encrypt); 188 189 void 190 RC2_decrypt(unsigned long *d, RC2_KEY *key) 191 { 192 int i, n; 193 RC2_INT *p0, *p1; 194 RC2_INT x0, x1, x2, x3, t; 195 unsigned long l; 196 197 l = d[0]; 198 x0 = (RC2_INT)l & 0xffff; 199 x1 = (RC2_INT)(l >> 16L); 200 l = d[1]; 201 x2 = (RC2_INT)l & 0xffff; 202 x3 = (RC2_INT)(l >> 16L); 203 204 n = 3; 205 i = 5; 206 207 p0 = &(key->data[63]); 208 p1 = &(key->data[0]); 209 for (;;) { 210 t = ((x3 << 11)|(x3 >> 5)) & 0xffff; 211 x3 = (t - (x0 & ~x2) - (x1 & x2) - *(p0--)) & 0xffff; 212 t = ((x2 << 13)|(x2 >> 3)) & 0xffff; 213 x2 = (t - (x3 & ~x1) - (x0 & x1) - *(p0--)) & 0xffff; 214 t = ((x1 << 14)|(x1 >> 2)) & 0xffff; 215 x1 = (t - (x2 & ~x0) - (x3 & x0) - *(p0--)) & 0xffff; 216 t = ((x0 << 15)|(x0 >> 1)) & 0xffff; 217 x0 = (t - (x1 & ~x3) - (x2 & x3) - *(p0--)) & 0xffff; 218 219 if (--i == 0) { 220 if (--n == 0) 221 break; 222 i = (n == 2) ? 6 : 5; 223 224 x3 = (x3 - p1[x2 & 0x3f]) & 0xffff; 225 x2 = (x2 - p1[x1 & 0x3f]) & 0xffff; 226 x1 = (x1 - p1[x0 & 0x3f]) & 0xffff; 227 x0 = (x0 - p1[x3 & 0x3f]) & 0xffff; 228 } 229 } 230 231 d[0] = (unsigned long)(x0 & 0xffff)|((unsigned long)(x1 & 0xffff) << 232 16L); 233 d[1] = (unsigned long)(x2 & 0xffff)|((unsigned long)(x3 & 0xffff) << 234 16L); 235 } 236 LCRYPTO_ALIAS(RC2_decrypt); 237