des_enc.c revision 1.1
1 /* crypto/des/des_enc.c */ 2 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay (at) 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 (at) 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 (at) 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 (at) 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 <sys/types.h> 60 #include <crypto/des/des_locl.h> 61 62 extern const DES_LONG des_SPtrans[8][64]; 63 64 void des_encrypt1(DES_LONG *data, des_key_schedule ks, int enc) 65 { 66 register DES_LONG l,r,t,u; 67 #ifdef DES_PTR 68 register const unsigned char *des_SP=(const unsigned char *)des_SPtrans; 69 #endif 70 #ifndef DES_UNROLL 71 register int i; 72 #endif 73 register DES_LONG *s; 74 75 r=data[0]; 76 l=data[1]; 77 78 IP(r,l); 79 /* Things have been modified so that the initial rotate is 80 * done outside the loop. This required the 81 * des_SPtrans values in sp.h to be rotated 1 bit to the right. 82 * One perl script later and things have a 5% speed up on a sparc2. 83 * Thanks to Richard Outerbridge <71755.204 (at) CompuServe.COM> 84 * for pointing this out. */ 85 /* clear the top bits on machines with 8byte longs */ 86 /* shift left by 2 */ 87 r=ROTATE(r,29)&0xffffffffL; 88 l=ROTATE(l,29)&0xffffffffL; 89 90 s=ks->ks.deslong; 91 /* I don't know if it is worth the effort of loop unrolling the 92 * inner loop */ 93 if (enc) 94 { 95 #ifdef DES_UNROLL 96 D_ENCRYPT(l,r, 0); /* 1 */ 97 D_ENCRYPT(r,l, 2); /* 2 */ 98 D_ENCRYPT(l,r, 4); /* 3 */ 99 D_ENCRYPT(r,l, 6); /* 4 */ 100 D_ENCRYPT(l,r, 8); /* 5 */ 101 D_ENCRYPT(r,l,10); /* 6 */ 102 D_ENCRYPT(l,r,12); /* 7 */ 103 D_ENCRYPT(r,l,14); /* 8 */ 104 D_ENCRYPT(l,r,16); /* 9 */ 105 D_ENCRYPT(r,l,18); /* 10 */ 106 D_ENCRYPT(l,r,20); /* 11 */ 107 D_ENCRYPT(r,l,22); /* 12 */ 108 D_ENCRYPT(l,r,24); /* 13 */ 109 D_ENCRYPT(r,l,26); /* 14 */ 110 D_ENCRYPT(l,r,28); /* 15 */ 111 D_ENCRYPT(r,l,30); /* 16 */ 112 #else 113 for (i=0; i<32; i+=8) 114 { 115 D_ENCRYPT(l,r,i+0); /* 1 */ 116 D_ENCRYPT(r,l,i+2); /* 2 */ 117 D_ENCRYPT(l,r,i+4); /* 3 */ 118 D_ENCRYPT(r,l,i+6); /* 4 */ 119 } 120 #endif 121 } 122 else 123 { 124 #ifdef DES_UNROLL 125 D_ENCRYPT(l,r,30); /* 16 */ 126 D_ENCRYPT(r,l,28); /* 15 */ 127 D_ENCRYPT(l,r,26); /* 14 */ 128 D_ENCRYPT(r,l,24); /* 13 */ 129 D_ENCRYPT(l,r,22); /* 12 */ 130 D_ENCRYPT(r,l,20); /* 11 */ 131 D_ENCRYPT(l,r,18); /* 10 */ 132 D_ENCRYPT(r,l,16); /* 9 */ 133 D_ENCRYPT(l,r,14); /* 8 */ 134 D_ENCRYPT(r,l,12); /* 7 */ 135 D_ENCRYPT(l,r,10); /* 6 */ 136 D_ENCRYPT(r,l, 8); /* 5 */ 137 D_ENCRYPT(l,r, 6); /* 4 */ 138 D_ENCRYPT(r,l, 4); /* 3 */ 139 D_ENCRYPT(l,r, 2); /* 2 */ 140 D_ENCRYPT(r,l, 0); /* 1 */ 141 #else 142 for (i=30; i>0; i-=8) 143 { 144 D_ENCRYPT(l,r,i-0); /* 16 */ 145 D_ENCRYPT(r,l,i-2); /* 15 */ 146 D_ENCRYPT(l,r,i-4); /* 14 */ 147 D_ENCRYPT(r,l,i-6); /* 13 */ 148 } 149 #endif 150 } 151 152 /* rotate and clear the top bits on machines with 8byte longs */ 153 l=ROTATE(l,3)&0xffffffffL; 154 r=ROTATE(r,3)&0xffffffffL; 155 156 FP(r,l); 157 data[0]=l; 158 data[1]=r; 159 l=r=t=u=0; 160 } 161 162 void des_encrypt2(DES_LONG *data, des_key_schedule ks, int enc) 163 { 164 register DES_LONG l,r,t,u; 165 #ifdef DES_PTR 166 register const unsigned char *des_SP=(const unsigned char *)des_SPtrans; 167 #endif 168 #ifndef DES_UNROLL 169 register int i; 170 #endif 171 register DES_LONG *s; 172 173 r=data[0]; 174 l=data[1]; 175 176 /* Things have been modified so that the initial rotate is 177 * done outside the loop. This required the 178 * des_SPtrans values in sp.h to be rotated 1 bit to the right. 179 * One perl script later and things have a 5% speed up on a sparc2. 180 * Thanks to Richard Outerbridge <71755.204 (at) CompuServe.COM> 181 * for pointing this out. */ 182 /* clear the top bits on machines with 8byte longs */ 183 r=ROTATE(r,29)&0xffffffffL; 184 l=ROTATE(l,29)&0xffffffffL; 185 186 s=ks->ks.deslong; 187 /* I don't know if it is worth the effort of loop unrolling the 188 * inner loop */ 189 if (enc) 190 { 191 #ifdef DES_UNROLL 192 D_ENCRYPT(l,r, 0); /* 1 */ 193 D_ENCRYPT(r,l, 2); /* 2 */ 194 D_ENCRYPT(l,r, 4); /* 3 */ 195 D_ENCRYPT(r,l, 6); /* 4 */ 196 D_ENCRYPT(l,r, 8); /* 5 */ 197 D_ENCRYPT(r,l,10); /* 6 */ 198 D_ENCRYPT(l,r,12); /* 7 */ 199 D_ENCRYPT(r,l,14); /* 8 */ 200 D_ENCRYPT(l,r,16); /* 9 */ 201 D_ENCRYPT(r,l,18); /* 10 */ 202 D_ENCRYPT(l,r,20); /* 11 */ 203 D_ENCRYPT(r,l,22); /* 12 */ 204 D_ENCRYPT(l,r,24); /* 13 */ 205 D_ENCRYPT(r,l,26); /* 14 */ 206 D_ENCRYPT(l,r,28); /* 15 */ 207 D_ENCRYPT(r,l,30); /* 16 */ 208 #else 209 for (i=0; i<32; i+=8) 210 { 211 D_ENCRYPT(l,r,i+0); /* 1 */ 212 D_ENCRYPT(r,l,i+2); /* 2 */ 213 D_ENCRYPT(l,r,i+4); /* 3 */ 214 D_ENCRYPT(r,l,i+6); /* 4 */ 215 } 216 #endif 217 } 218 else 219 { 220 #ifdef DES_UNROLL 221 D_ENCRYPT(l,r,30); /* 16 */ 222 D_ENCRYPT(r,l,28); /* 15 */ 223 D_ENCRYPT(l,r,26); /* 14 */ 224 D_ENCRYPT(r,l,24); /* 13 */ 225 D_ENCRYPT(l,r,22); /* 12 */ 226 D_ENCRYPT(r,l,20); /* 11 */ 227 D_ENCRYPT(l,r,18); /* 10 */ 228 D_ENCRYPT(r,l,16); /* 9 */ 229 D_ENCRYPT(l,r,14); /* 8 */ 230 D_ENCRYPT(r,l,12); /* 7 */ 231 D_ENCRYPT(l,r,10); /* 6 */ 232 D_ENCRYPT(r,l, 8); /* 5 */ 233 D_ENCRYPT(l,r, 6); /* 4 */ 234 D_ENCRYPT(r,l, 4); /* 3 */ 235 D_ENCRYPT(l,r, 2); /* 2 */ 236 D_ENCRYPT(r,l, 0); /* 1 */ 237 #else 238 for (i=30; i>0; i-=8) 239 { 240 D_ENCRYPT(l,r,i-0); /* 16 */ 241 D_ENCRYPT(r,l,i-2); /* 15 */ 242 D_ENCRYPT(l,r,i-4); /* 14 */ 243 D_ENCRYPT(r,l,i-6); /* 13 */ 244 } 245 #endif 246 } 247 /* rotate and clear the top bits on machines with 8byte longs */ 248 data[0]=ROTATE(l,3)&0xffffffffL; 249 data[1]=ROTATE(r,3)&0xffffffffL; 250 l=r=t=u=0; 251 } 252 253 void des_encrypt3(DES_LONG *data, des_key_schedule ks1, des_key_schedule ks2, 254 des_key_schedule ks3) 255 { 256 register DES_LONG l,r; 257 258 l=data[0]; 259 r=data[1]; 260 IP(l,r); 261 data[0]=l; 262 data[1]=r; 263 des_encrypt2((DES_LONG *)data,ks1,DES_ENCRYPT); 264 des_encrypt2((DES_LONG *)data,ks2,DES_DECRYPT); 265 des_encrypt2((DES_LONG *)data,ks3,DES_ENCRYPT); 266 l=data[0]; 267 r=data[1]; 268 FP(r,l); 269 data[0]=l; 270 data[1]=r; 271 } 272 273 void des_decrypt3(DES_LONG *data, des_key_schedule ks1, des_key_schedule ks2, 274 des_key_schedule ks3) 275 { 276 register DES_LONG l,r; 277 278 l=data[0]; 279 r=data[1]; 280 IP(l,r); 281 data[0]=l; 282 data[1]=r; 283 des_encrypt2((DES_LONG *)data,ks3,DES_DECRYPT); 284 des_encrypt2((DES_LONG *)data,ks2,DES_ENCRYPT); 285 des_encrypt2((DES_LONG *)data,ks1,DES_DECRYPT); 286 l=data[0]; 287 r=data[1]; 288 FP(r,l); 289 data[0]=l; 290 data[1]=r; 291 } 292
Indexes created Mon Sep 29 21:09:56 GMT 2025