crypto/des/des_enc.c

   1 /* crypto/des/des_enc.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
  61 void des_encrypt(data, ks, enc)
  62 DES_LONG *data;
  63 des_key_schedule ks;
  64 int enc;
  65         {
  66         register DES_LONG l,r,t,u;
  67 #ifdef DES_PTR
  68         register unsigned char *des_SP=(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@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=(DES_LONG *)ks;
  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(data, ks, enc)
 163 DES_LONG *data;
 164 des_key_schedule ks;
 165 int enc;
 166         {
 167         register DES_LONG l,r,t,u;
 168 #ifdef DES_PTR
 169         register unsigned char *des_SP=(unsigned char *)des_SPtrans;
 170 #endif
 171 #ifndef DES_UNROLL
 172         register int i;
 173 #endif
 174         register DES_LONG *s;
 175
 176         r=data[0];
 177         l=data[1];
 178
 179         /* Things have been modified so that the initial rotate is
 180          * done outside the loop.  This required the
 181          * des_SPtrans values in sp.h to be rotated 1 bit to the right.
 182          * One perl script later and things have a 5% speed up on a sparc2.
 183          * Thanks to Richard Outerbridge <71755.204@CompuServe.COM>
 184          * for pointing this out. */
 185         /* clear the top bits on machines with 8byte longs */
 186         r=ROTATE(r,29)&0xffffffffL;
 187         l=ROTATE(l,29)&0xffffffffL;
 188
 189         s=(DES_LONG *)ks;
 190         /* I don't know if it is worth the effort of loop unrolling the
 191          * inner loop */
 192         if (enc)
 193                 {
 194 #ifdef DES_UNROLL
 195                 D_ENCRYPT(l,r, 0); /*  1 */
 196                 D_ENCRYPT(r,l, 2); /*  2 */
 197                 D_ENCRYPT(l,r, 4); /*  3 */
 198                 D_ENCRYPT(r,l, 6); /*  4 */
 199                 D_ENCRYPT(l,r, 8); /*  5 */
 200                 D_ENCRYPT(r,l,10); /*  6 */
 201                 D_ENCRYPT(l,r,12); /*  7 */
 202                 D_ENCRYPT(r,l,14); /*  8 */
 203                 D_ENCRYPT(l,r,16); /*  9 */
 204                 D_ENCRYPT(r,l,18); /*  10 */
 205                 D_ENCRYPT(l,r,20); /*  11 */
 206                 D_ENCRYPT(r,l,22); /*  12 */
 207                 D_ENCRYPT(l,r,24); /*  13 */
 208                 D_ENCRYPT(r,l,26); /*  14 */
 209                 D_ENCRYPT(l,r,28); /*  15 */
 210                 D_ENCRYPT(r,l,30); /*  16 */
 211 #else
 212                 for (i=0; i<32; i+=8)
 213                         {
 214                         D_ENCRYPT(l,r,i+0); /*  1 */
 215                         D_ENCRYPT(r,l,i+2); /*  2 */
 216                         D_ENCRYPT(l,r,i+4); /*  3 */
 217                         D_ENCRYPT(r,l,i+6); /*  4 */
 218                         }
 219 #endif
 220                 }
 221         else
 222                 {
 223 #ifdef DES_UNROLL
 224                 D_ENCRYPT(l,r,30); /* 16 */
 225                 D_ENCRYPT(r,l,28); /* 15 */
 226                 D_ENCRYPT(l,r,26); /* 14 */
 227                 D_ENCRYPT(r,l,24); /* 13 */
 228                 D_ENCRYPT(l,r,22); /* 12 */
 229                 D_ENCRYPT(r,l,20); /* 11 */
 230                 D_ENCRYPT(l,r,18); /* 10 */
 231                 D_ENCRYPT(r,l,16); /*  9 */
 232                 D_ENCRYPT(l,r,14); /*  8 */
 233                 D_ENCRYPT(r,l,12); /*  7 */
 234                 D_ENCRYPT(l,r,10); /*  6 */
 235                 D_ENCRYPT(r,l, 8); /*  5 */
 236                 D_ENCRYPT(l,r, 6); /*  4 */
 237                 D_ENCRYPT(r,l, 4); /*  3 */
 238                 D_ENCRYPT(l,r, 2); /*  2 */
 239                 D_ENCRYPT(r,l, 0); /*  1 */
 240 #else
 241                 for (i=30; i>0; i-=8)
 242                         {
 243                         D_ENCRYPT(l,r,i-0); /* 16 */
 244                         D_ENCRYPT(r,l,i-2); /* 15 */
 245                         D_ENCRYPT(l,r,i-4); /* 14 */
 246                         D_ENCRYPT(r,l,i-6); /* 13 */
 247                         }
 248 #endif
 249                 }
 250         /* rotate and clear the top bits on machines with 8byte longs */
 251         data[0]=ROTATE(l,3)&0xffffffffL;
 252         data[1]=ROTATE(r,3)&0xffffffffL;
 253         l=r=t=u=0;
 254         }
 255
 256 void des_encrypt3(data,ks1,ks2,ks3)
 257 DES_LONG *data;
 258 des_key_schedule ks1;
 259 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(data,ks1,ks2,ks3)
 280 DES_LONG *data;
 281 des_key_schedule ks1;
 282 des_key_schedule ks2;
 283 des_key_schedule ks3;
 284         {
 285         register DES_LONG l,r;
 286
 287         l=data[0];
 288         r=data[1];
 289         IP(l,r);
 290         data[0]=l;
 291         data[1]=r;
 292         des_encrypt2((DES_LONG *)data,ks3,DES_DECRYPT);
 293         des_encrypt2((DES_LONG *)data,ks2,DES_ENCRYPT);
 294         des_encrypt2((DES_LONG *)data,ks1,DES_DECRYPT);
 295         l=data[0];
 296         r=data[1];
 297         FP(r,l);
 298         data[0]=l;
 299         data[1]=r;
 300         }
 301
 302 #ifndef DES_DEFAULT_OPTIONS
 303
 304 void des_ncbc_encrypt(in, out, length, schedule, ivec, enc)
 305 const unsigned char *in;
 306 unsigned char *out;
 307 long length;
 308 des_key_schedule schedule;
 309 des_cblock ivec;
 310 int enc;
 311         {
 312         register DES_LONG tin0,tin1;
 313         register DES_LONG tout0,tout1,xor0,xor1;
 314         register long l=length;
 315         DES_LONG tin[2];
 316         unsigned char *iv;
 317
 318         iv=ivec;
 319
 320         if (enc)
 321                 {
 322                 c2l(iv,tout0);
 323                 c2l(iv,tout1);
 324                 for (l-=8; l>=0; l-=8)
 325                         {
 326                         c2l(in,tin0);
 327                         c2l(in,tin1);
 328                         tin0^=tout0; tin[0]=tin0;
 329                         tin1^=tout1; tin[1]=tin1;
 330                         des_encrypt((DES_LONG *)tin,schedule,DES_ENCRYPT);
 331                         tout0=tin[0]; l2c(tout0,out);
 332                         tout1=tin[1]; l2c(tout1,out);
 333                         }
 334                 if (l != -8)
 335                         {
 336                         c2ln(in,tin0,tin1,l+8);
 337                         tin0^=tout0; tin[0]=tin0;
 338                         tin1^=tout1; tin[1]=tin1;
 339                         des_encrypt((DES_LONG *)tin,schedule,DES_ENCRYPT);
 340                         tout0=tin[0]; l2c(tout0,out);
 341                         tout1=tin[1]; l2c(tout1,out);
 342                         }
 343                 iv=ivec;
 344                 l2c(tout0,iv);
 345                 l2c(tout1,iv);
 346                 }
 347         else
 348                 {
 349                 c2l(iv,xor0);
 350                 c2l(iv,xor1);
 351                 for (l-=8; l>=0; l-=8)
 352                         {
 353                         c2l(in,tin0); tin[0]=tin0;
 354                         c2l(in,tin1); tin[1]=tin1;
 355                         des_encrypt((DES_LONG *)tin,schedule,DES_DECRYPT);
 356                         tout0=tin[0]^xor0;
 357                         tout1=tin[1]^xor1;
 358                         l2c(tout0,out);
 359                         l2c(tout1,out);
 360                         xor0=tin0;
 361                         xor1=tin1;
 362                         }
 363                 if (l != -8)
 364                         {
 365                         c2l(in,tin0); tin[0]=tin0;
 366                         c2l(in,tin1); tin[1]=tin1;
 367                         des_encrypt((DES_LONG *)tin,schedule,DES_DECRYPT);
 368                         tout0=tin[0]^xor0;
 369                         tout1=tin[1]^xor1;
 370                         l2cn(tout0,tout1,out,l+8);
 371                         xor0=tin0;
 372                         xor1=tin1;
 373                         }
 374
 375                 iv=ivec;
 376                 l2c(xor0,iv);
 377                 l2c(xor1,iv);
 378                 }
 379         tin0=tin1=tout0=tout1=xor0=xor1=0;
 380         tin[0]=tin[1]=0;
 381         }
 382
 383 void des_ede3_cbc_encrypt(input, output, length, ks1, ks2, ks3, ivec, enc)
 384 const unsigned char *input;
 385 unsigned char *output;
 386 long length;
 387 des_key_schedule ks1;
 388 des_key_schedule ks2;
 389 des_key_schedule ks3;
 390 des_cblock ivec;
 391 int enc;
 392         {
 393         register DES_LONG tin0,tin1;
 394         register DES_LONG tout0,tout1,xor0,xor1;
 395         register unsigned char *in,*out;
 396         register long l=length;
 397         DES_LONG tin[2];
 398         unsigned char *iv;
 399
 400         in=(unsigned char *)input;
 401         out=(unsigned char *)output;
 402         iv=(unsigned char *)ivec;
 403
 404         if (enc)
 405                 {
 406                 c2l(iv,tout0);
 407                 c2l(iv,tout1);
 408                 for (l-=8; l>=0; l-=8)
 409                         {
 410                         c2l(in,tin0);
 411                         c2l(in,tin1);
 412                         tin0^=tout0;
 413                         tin1^=tout1;
 414
 415                         tin[0]=tin0;
 416                         tin[1]=tin1;
 417                         des_encrypt3((DES_LONG *)tin,ks1,ks2,ks3);
 418                         tout0=tin[0];
 419                         tout1=tin[1];
 420
 421                         l2c(tout0,out);
 422                         l2c(tout1,out);
 423                         }
 424                 if (l != -8)
 425                         {
 426                         c2ln(in,tin0,tin1,l+8);
 427                         tin0^=tout0;
 428                         tin1^=tout1;
 429
 430                         tin[0]=tin0;
 431                         tin[1]=tin1;
 432                         des_encrypt3((DES_LONG *)tin,ks1,ks2,ks3);
 433                         tout0=tin[0];
 434                         tout1=tin[1];
 435
 436                         l2c(tout0,out);
 437                         l2c(tout1,out);
 438                         }
 439                 iv=(unsigned char *)ivec;
 440                 l2c(tout0,iv);
 441                 l2c(tout1,iv);
 442                 }
 443         else
 444                 {
 445                 register DES_LONG t0,t1;
 446
 447                 c2l(iv,xor0);
 448                 c2l(iv,xor1);
 449                 for (l-=8; l>=0; l-=8)
 450                         {
 451                         c2l(in,tin0);
 452                         c2l(in,tin1);
 453
 454                         t0=tin0;
 455                         t1=tin1;
 456
 457                         tin[0]=tin0;
 458                         tin[1]=tin1;
 459                         des_decrypt3((DES_LONG *)tin,ks1,ks2,ks3);
 460                         tout0=tin[0];
 461                         tout1=tin[1];
 462
 463                         tout0^=xor0;
 464                         tout1^=xor1;
 465                         l2c(tout0,out);
 466                         l2c(tout1,out);
 467                         xor0=t0;
 468                         xor1=t1;
 469                         }
 470                 if (l != -8)
 471                         {
 472                         c2l(in,tin0);
 473                         c2l(in,tin1);
 474
 475                         t0=tin0;
 476                         t1=tin1;
 477
 478                         tin[0]=tin0;
 479                         tin[1]=tin1;
 480                         des_decrypt3((DES_LONG *)tin,ks1,ks2,ks3);
 481                         tout0=tin[0];
 482                         tout1=tin[1];
 483
 484                         tout0^=xor0;
 485                         tout1^=xor1;
 486                         l2cn(tout0,tout1,out,l+8);
 487                         xor0=t0;
 488                         xor1=t1;
 489                         }
 490
 491                 iv=(unsigned char *)ivec;
 492                 l2c(xor0,iv);
 493                 l2c(xor1,iv);
 494                 }
 495         tin0=tin1=tout0=tout1=xor0=xor1=0;
 496         tin[0]=tin[1]=0;
 497         }
 498
 499 #endif /* DES_DEFAULT_OPTIONS */