Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/crypto/des/des_enc.c
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1 /* $KAME: des_enc.c,v 1.1 2001/09/10 04:03:58 itojun Exp $ */ 2 3 /* crypto/des/des_enc.c */ 4 5 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 6 * All rights reserved. 7 * 8 * This package is an SSL implementation written 9 * by Eric Young (eay@cryptsoft.com). 10 * The implementation was written so as to conform with Netscapes SSL. 11 * 12 * This library is free for commercial and non-commercial use as long as 13 * the following conditions are aheared to. The following conditions 14 * apply to all code found in this distribution, be it the RC4, RSA, 15 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 16 * included with this distribution is covered by the same copyright terms 17 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 18 * 19 * Copyright remains Eric Young's, and as such any Copyright notices in 20 * the code are not to be removed. 21 * If this package is used in a product, Eric Young should be given attribution 22 * as the author of the parts of the library used. 23 * This can be in the form of a textual message at program startup or 24 * in documentation (online or textual) provided with the package. 25 * 26 * Redistribution and use in source and binary forms, with or without 27 * modification, are permitted provided that the following conditions 28 * are met: 29 * 1. Redistributions of source code must retain the copyright 30 * notice, this list of conditions and the following disclaimer. 31 * 2. Redistributions in binary form must reproduce the above copyright 32 * notice, this list of conditions and the following disclaimer in the 33 * documentation and/or other materials provided with the distribution. 34 * 3. All advertising materials mentioning features or use of this software 35 * must display the following acknowledgement: 36 * "This product includes cryptographic software written by 37 * Eric Young (eay@cryptsoft.com)" 38 * The word 'cryptographic' can be left out if the rouines from the library 39 * being used are not cryptographic related :-). 40 * 4. If you include any Windows specific code (or a derivative thereof) from 41 * the apps directory (application code) you must include an acknowledgement: 42 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 43 * 44 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 45 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 46 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 47 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 48 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 49 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 50 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 51 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 52 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 53 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 54 * SUCH DAMAGE. 55 * 56 * The licence and distribution terms for any publically available version or 57 * derivative of this code cannot be changed. i.e. this code cannot simply be 58 * copied and put under another distribution licence 59 * [including the GNU Public Licence.] 60 */ 61 62 #include <sys/cdefs.h> 63 __FBSDID("$FreeBSD: releng/6.4/sys/crypto/des/des_enc.c 130443 2004-06-14 00:38:54Z obrien $"); 64 65 #include <sys/types.h> 66 #include <crypto/des/des_locl.h> 67 68 extern const DES_LONG des_SPtrans[8][64]; 69 70 void des_encrypt1(DES_LONG *data, des_key_schedule ks, int enc) 71 { 72 register DES_LONG l,r,t,u; 73 #ifdef DES_PTR 74 register const unsigned char *des_SP=(const unsigned char *)des_SPtrans; 75 #endif 76 #ifndef DES_UNROLL 77 register int i; 78 #endif 79 register DES_LONG *s; 80 81 r=data[0]; 82 l=data[1]; 83 84 IP(r,l); 85 /* Things have been modified so that the initial rotate is 86 * done outside the loop. This required the 87 * des_SPtrans values in sp.h to be rotated 1 bit to the right. 88 * One perl script later and things have a 5% speed up on a sparc2. 89 * Thanks to Richard Outerbridge <71755.204@CompuServe.COM> 90 * for pointing this out. */ 91 /* clear the top bits on machines with 8byte longs */ 92 /* shift left by 2 */ 93 r=ROTATE(r,29)&0xffffffffL; 94 l=ROTATE(l,29)&0xffffffffL; 95 96 s=ks->ks.deslong; 97 /* I don't know if it is worth the effort of loop unrolling the 98 * inner loop */ 99 if (enc) 100 { 101 #ifdef DES_UNROLL 102 D_ENCRYPT(l,r, 0); /* 1 */ 103 D_ENCRYPT(r,l, 2); /* 2 */ 104 D_ENCRYPT(l,r, 4); /* 3 */ 105 D_ENCRYPT(r,l, 6); /* 4 */ 106 D_ENCRYPT(l,r, 8); /* 5 */ 107 D_ENCRYPT(r,l,10); /* 6 */ 108 D_ENCRYPT(l,r,12); /* 7 */ 109 D_ENCRYPT(r,l,14); /* 8 */ 110 D_ENCRYPT(l,r,16); /* 9 */ 111 D_ENCRYPT(r,l,18); /* 10 */ 112 D_ENCRYPT(l,r,20); /* 11 */ 113 D_ENCRYPT(r,l,22); /* 12 */ 114 D_ENCRYPT(l,r,24); /* 13 */ 115 D_ENCRYPT(r,l,26); /* 14 */ 116 D_ENCRYPT(l,r,28); /* 15 */ 117 D_ENCRYPT(r,l,30); /* 16 */ 118 #else 119 for (i=0; i<32; i+=8) 120 { 121 D_ENCRYPT(l,r,i+0); /* 1 */ 122 D_ENCRYPT(r,l,i+2); /* 2 */ 123 D_ENCRYPT(l,r,i+4); /* 3 */ 124 D_ENCRYPT(r,l,i+6); /* 4 */ 125 } 126 #endif 127 } 128 else 129 { 130 #ifdef DES_UNROLL 131 D_ENCRYPT(l,r,30); /* 16 */ 132 D_ENCRYPT(r,l,28); /* 15 */ 133 D_ENCRYPT(l,r,26); /* 14 */ 134 D_ENCRYPT(r,l,24); /* 13 */ 135 D_ENCRYPT(l,r,22); /* 12 */ 136 D_ENCRYPT(r,l,20); /* 11 */ 137 D_ENCRYPT(l,r,18); /* 10 */ 138 D_ENCRYPT(r,l,16); /* 9 */ 139 D_ENCRYPT(l,r,14); /* 8 */ 140 D_ENCRYPT(r,l,12); /* 7 */ 141 D_ENCRYPT(l,r,10); /* 6 */ 142 D_ENCRYPT(r,l, 8); /* 5 */ 143 D_ENCRYPT(l,r, 6); /* 4 */ 144 D_ENCRYPT(r,l, 4); /* 3 */ 145 D_ENCRYPT(l,r, 2); /* 2 */ 146 D_ENCRYPT(r,l, 0); /* 1 */ 147 #else 148 for (i=30; i>0; i-=8) 149 { 150 D_ENCRYPT(l,r,i-0); /* 16 */ 151 D_ENCRYPT(r,l,i-2); /* 15 */ 152 D_ENCRYPT(l,r,i-4); /* 14 */ 153 D_ENCRYPT(r,l,i-6); /* 13 */ 154 } 155 #endif 156 } 157 158 /* rotate and clear the top bits on machines with 8byte longs */ 159 l=ROTATE(l,3)&0xffffffffL; 160 r=ROTATE(r,3)&0xffffffffL; 161 162 FP(r,l); 163 data[0]=l; 164 data[1]=r; 165 l=r=t=u=0; 166 } 167 168 void des_encrypt2(DES_LONG *data, des_key_schedule ks, int enc) 169 { 170 register DES_LONG l,r,t,u; 171 #ifdef DES_PTR 172 register const unsigned char *des_SP=(const unsigned char *)des_SPtrans; 173 #endif 174 #ifndef DES_UNROLL 175 register int i; 176 #endif 177 register DES_LONG *s; 178 179 r=data[0]; 180 l=data[1]; 181 182 /* Things have been modified so that the initial rotate is 183 * done outside the loop. This required the 184 * des_SPtrans values in sp.h to be rotated 1 bit to the right. 185 * One perl script later and things have a 5% speed up on a sparc2. 186 * Thanks to Richard Outerbridge <71755.204@CompuServe.COM> 187 * for pointing this out. */ 188 /* clear the top bits on machines with 8byte longs */ 189 r=ROTATE(r,29)&0xffffffffL; 190 l=ROTATE(l,29)&0xffffffffL; 191 192 s=ks->ks.deslong; 193 /* I don't know if it is worth the effort of loop unrolling the 194 * inner loop */ 195 if (enc) 196 { 197 #ifdef DES_UNROLL 198 D_ENCRYPT(l,r, 0); /* 1 */ 199 D_ENCRYPT(r,l, 2); /* 2 */ 200 D_ENCRYPT(l,r, 4); /* 3 */ 201 D_ENCRYPT(r,l, 6); /* 4 */ 202 D_ENCRYPT(l,r, 8); /* 5 */ 203 D_ENCRYPT(r,l,10); /* 6 */ 204 D_ENCRYPT(l,r,12); /* 7 */ 205 D_ENCRYPT(r,l,14); /* 8 */ 206 D_ENCRYPT(l,r,16); /* 9 */ 207 D_ENCRYPT(r,l,18); /* 10 */ 208 D_ENCRYPT(l,r,20); /* 11 */ 209 D_ENCRYPT(r,l,22); /* 12 */ 210 D_ENCRYPT(l,r,24); /* 13 */ 211 D_ENCRYPT(r,l,26); /* 14 */ 212 D_ENCRYPT(l,r,28); /* 15 */ 213 D_ENCRYPT(r,l,30); /* 16 */ 214 #else 215 for (i=0; i<32; i+=8) 216 { 217 D_ENCRYPT(l,r,i+0); /* 1 */ 218 D_ENCRYPT(r,l,i+2); /* 2 */ 219 D_ENCRYPT(l,r,i+4); /* 3 */ 220 D_ENCRYPT(r,l,i+6); /* 4 */ 221 } 222 #endif 223 } 224 else 225 { 226 #ifdef DES_UNROLL 227 D_ENCRYPT(l,r,30); /* 16 */ 228 D_ENCRYPT(r,l,28); /* 15 */ 229 D_ENCRYPT(l,r,26); /* 14 */ 230 D_ENCRYPT(r,l,24); /* 13 */ 231 D_ENCRYPT(l,r,22); /* 12 */ 232 D_ENCRYPT(r,l,20); /* 11 */ 233 D_ENCRYPT(l,r,18); /* 10 */ 234 D_ENCRYPT(r,l,16); /* 9 */ 235 D_ENCRYPT(l,r,14); /* 8 */ 236 D_ENCRYPT(r,l,12); /* 7 */ 237 D_ENCRYPT(l,r,10); /* 6 */ 238 D_ENCRYPT(r,l, 8); /* 5 */ 239 D_ENCRYPT(l,r, 6); /* 4 */ 240 D_ENCRYPT(r,l, 4); /* 3 */ 241 D_ENCRYPT(l,r, 2); /* 2 */ 242 D_ENCRYPT(r,l, 0); /* 1 */ 243 #else 244 for (i=30; i>0; i-=8) 245 { 246 D_ENCRYPT(l,r,i-0); /* 16 */ 247 D_ENCRYPT(r,l,i-2); /* 15 */ 248 D_ENCRYPT(l,r,i-4); /* 14 */ 249 D_ENCRYPT(r,l,i-6); /* 13 */ 250 } 251 #endif 252 } 253 /* rotate and clear the top bits on machines with 8byte longs */ 254 data[0]=ROTATE(l,3)&0xffffffffL; 255 data[1]=ROTATE(r,3)&0xffffffffL; 256 l=r=t=u=0; 257 } 258 259 void des_encrypt3(DES_LONG *data, des_key_schedule ks1, des_key_schedule ks2, 260 des_key_schedule ks3) 261 { 262 register DES_LONG l,r; 263 264 l=data[0]; 265 r=data[1]; 266 IP(l,r); 267 data[0]=l; 268 data[1]=r; 269 des_encrypt2((DES_LONG *)data,ks1,DES_ENCRYPT); 270 des_encrypt2((DES_LONG *)data,ks2,DES_DECRYPT); 271 des_encrypt2((DES_LONG *)data,ks3,DES_ENCRYPT); 272 l=data[0]; 273 r=data[1]; 274 FP(r,l); 275 data[0]=l; 276 data[1]=r; 277 } 278 279 void des_decrypt3(DES_LONG *data, des_key_schedule ks1, des_key_schedule ks2, 280 des_key_schedule ks3) 281 { 282 register DES_LONG l,r; 283 284 l=data[0]; 285 r=data[1]; 286 IP(l,r); 287 data[0]=l; 288 data[1]=r; 289 des_encrypt2((DES_LONG *)data,ks3,DES_DECRYPT); 290 des_encrypt2((DES_LONG *)data,ks2,DES_ENCRYPT); 291 des_encrypt2((DES_LONG *)data,ks1,DES_DECRYPT); 292 l=data[0]; 293 r=data[1]; 294 FP(r,l); 295 data[0]=l; 296 data[1]=r; 297 }
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