cfb64ede.c revision 296465
1/* crypto/des/cfb64ede.c */ 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 "des_locl.h" 60#include "e_os.h" 61 62/* 63 * The input and output encrypted as though 64bit cfb mode is being used. 64 * The extra state information to record how much of the 64bit block we have 65 * used is contained in *num; 66 */ 67 68void DES_ede3_cfb64_encrypt(const unsigned char *in, unsigned char *out, 69 long length, DES_key_schedule *ks1, 70 DES_key_schedule *ks2, DES_key_schedule *ks3, 71 DES_cblock *ivec, int *num, int enc) 72{ 73 register DES_LONG v0, v1; 74 register long l = length; 75 register int n = *num; 76 DES_LONG ti[2]; 77 unsigned char *iv, c, cc; 78 79 iv = &(*ivec)[0]; 80 if (enc) { 81 while (l--) { 82 if (n == 0) { 83 c2l(iv, v0); 84 c2l(iv, v1); 85 86 ti[0] = v0; 87 ti[1] = v1; 88 DES_encrypt3(ti, ks1, ks2, ks3); 89 v0 = ti[0]; 90 v1 = ti[1]; 91 92 iv = &(*ivec)[0]; 93 l2c(v0, iv); 94 l2c(v1, iv); 95 iv = &(*ivec)[0]; 96 } 97 c = *(in++) ^ iv[n]; 98 *(out++) = c; 99 iv[n] = c; 100 n = (n + 1) & 0x07; 101 } 102 } else { 103 while (l--) { 104 if (n == 0) { 105 c2l(iv, v0); 106 c2l(iv, v1); 107 108 ti[0] = v0; 109 ti[1] = v1; 110 DES_encrypt3(ti, ks1, ks2, ks3); 111 v0 = ti[0]; 112 v1 = ti[1]; 113 114 iv = &(*ivec)[0]; 115 l2c(v0, iv); 116 l2c(v1, iv); 117 iv = &(*ivec)[0]; 118 } 119 cc = *(in++); 120 c = iv[n]; 121 iv[n] = cc; 122 *(out++) = c ^ cc; 123 n = (n + 1) & 0x07; 124 } 125 } 126 v0 = v1 = ti[0] = ti[1] = c = cc = 0; 127 *num = n; 128} 129 130#ifdef undef /* MACRO */ 131void DES_ede2_cfb64_encrypt(unsigned char *in, unsigned char *out, 132 long length, DES_key_schedule ks1, 133 DES_key_schedule ks2, DES_cblock (*ivec), 134 int *num, int enc) 135{ 136 DES_ede3_cfb64_encrypt(in, out, length, ks1, ks2, ks1, ivec, num, enc); 137} 138#endif 139 140/* 141 * This is compatible with the single key CFB-r for DES, even thought that's 142 * not what EVP needs. 143 */ 144 145void DES_ede3_cfb_encrypt(const unsigned char *in, unsigned char *out, 146 int numbits, long length, DES_key_schedule *ks1, 147 DES_key_schedule *ks2, DES_key_schedule *ks3, 148 DES_cblock *ivec, int enc) 149{ 150 register DES_LONG d0, d1, v0, v1; 151 register unsigned long l = length, n = ((unsigned int)numbits + 7) / 8; 152 register int num = numbits, i; 153 DES_LONG ti[2]; 154 unsigned char *iv; 155 unsigned char ovec[16]; 156 157 if (num > 64) 158 return; 159 iv = &(*ivec)[0]; 160 c2l(iv, v0); 161 c2l(iv, v1); 162 if (enc) { 163 while (l >= n) { 164 l -= n; 165 ti[0] = v0; 166 ti[1] = v1; 167 DES_encrypt3(ti, ks1, ks2, ks3); 168 c2ln(in, d0, d1, n); 169 in += n; 170 d0 ^= ti[0]; 171 d1 ^= ti[1]; 172 l2cn(d0, d1, out, n); 173 out += n; 174 /* 175 * 30-08-94 - eay - changed because l>>32 and l<<32 are bad under 176 * gcc :-( 177 */ 178 if (num == 32) { 179 v0 = v1; 180 v1 = d0; 181 } else if (num == 64) { 182 v0 = d0; 183 v1 = d1; 184 } else { 185 iv = &ovec[0]; 186 l2c(v0, iv); 187 l2c(v1, iv); 188 l2c(d0, iv); 189 l2c(d1, iv); 190 /* shift ovec left most of the bits... */ 191 memmove(ovec, ovec + num / 8, 8 + (num % 8 ? 1 : 0)); 192 /* now the remaining bits */ 193 if (num % 8 != 0) 194 for (i = 0; i < 8; ++i) { 195 ovec[i] <<= num % 8; 196 ovec[i] |= ovec[i + 1] >> (8 - num % 8); 197 } 198 iv = &ovec[0]; 199 c2l(iv, v0); 200 c2l(iv, v1); 201 } 202 } 203 } else { 204 while (l >= n) { 205 l -= n; 206 ti[0] = v0; 207 ti[1] = v1; 208 DES_encrypt3(ti, ks1, ks2, ks3); 209 c2ln(in, d0, d1, n); 210 in += n; 211 /* 212 * 30-08-94 - eay - changed because l>>32 and l<<32 are bad under 213 * gcc :-( 214 */ 215 if (num == 32) { 216 v0 = v1; 217 v1 = d0; 218 } else if (num == 64) { 219 v0 = d0; 220 v1 = d1; 221 } else { 222 iv = &ovec[0]; 223 l2c(v0, iv); 224 l2c(v1, iv); 225 l2c(d0, iv); 226 l2c(d1, iv); 227 /* shift ovec left most of the bits... */ 228 memmove(ovec, ovec + num / 8, 8 + (num % 8 ? 1 : 0)); 229 /* now the remaining bits */ 230 if (num % 8 != 0) 231 for (i = 0; i < 8; ++i) { 232 ovec[i] <<= num % 8; 233 ovec[i] |= ovec[i + 1] >> (8 - num % 8); 234 } 235 iv = &ovec[0]; 236 c2l(iv, v0); 237 c2l(iv, v1); 238 } 239 d0 ^= ti[0]; 240 d1 ^= ti[1]; 241 l2cn(d0, d1, out, n); 242 out += n; 243 } 244 } 245 iv = &(*ivec)[0]; 246 l2c(v0, iv); 247 l2c(v1, iv); 248 v0 = v1 = d0 = d1 = ti[0] = ti[1] = 0; 249} 250