freeswan/libdes/des_enc.c

   1 /* crypto/des/des_enc.c */
   2 /* Copyright (C) 1995-1997 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 #ifdef HW_ASSIST
  76         if (hw_des_assist()) {
  77                 hw_des_encrypt(data, ks, enc);
  78                 return;
  79         }
  80 #endif
  81
  82         r=data[0];
  83         l=data[1];
  84
  85         IP(r,l);
  86         /* Things have been modified so that the initial rotate is
  87          * done outside the loop.  This required the
  88          * des_SPtrans values in sp.h to be rotated 1 bit to the right.
  89          * One perl script later and things have a 5% speed up on a sparc2.
  90          * Thanks to Richard Outerbridge <71755.204@CompuServe.COM>
  91          * for pointing this out. */
  92         /* clear the top bits on machines with 8byte longs */
  93         /* shift left by 2 */
  94         r=ROTATE(r,29)&0xffffffffL;
  95         l=ROTATE(l,29)&0xffffffffL;
  96
  97         s=(DES_LONG *)ks;
  98         /* I don't know if it is worth the effort of loop unrolling the
  99          * inner loop */
 100         if (enc)
 101                 {
 102 #ifdef DES_UNROLL
 103                 D_ENCRYPT(l,r, 0); /*  1 */
 104                 D_ENCRYPT(r,l, 2); /*  2 */
 105                 D_ENCRYPT(l,r, 4); /*  3 */
 106                 D_ENCRYPT(r,l, 6); /*  4 */
 107                 D_ENCRYPT(l,r, 8); /*  5 */
 108                 D_ENCRYPT(r,l,10); /*  6 */
 109                 D_ENCRYPT(l,r,12); /*  7 */
 110                 D_ENCRYPT(r,l,14); /*  8 */
 111                 D_ENCRYPT(l,r,16); /*  9 */
 112                 D_ENCRYPT(r,l,18); /*  10 */
 113                 D_ENCRYPT(l,r,20); /*  11 */
 114                 D_ENCRYPT(r,l,22); /*  12 */
 115                 D_ENCRYPT(l,r,24); /*  13 */
 116                 D_ENCRYPT(r,l,26); /*  14 */
 117                 D_ENCRYPT(l,r,28); /*  15 */
 118                 D_ENCRYPT(r,l,30); /*  16 */
 119 #else
 120                 for (i=0; i<32; i+=8)
 121                         {
 122                         D_ENCRYPT(l,r,i+0); /*  1 */
 123                         D_ENCRYPT(r,l,i+2); /*  2 */
 124                         D_ENCRYPT(l,r,i+4); /*  3 */
 125                         D_ENCRYPT(r,l,i+6); /*  4 */
 126                         }
 127 #endif
 128                 }
 129         else
 130                 {
 131 #ifdef DES_UNROLL
 132                 D_ENCRYPT(l,r,30); /* 16 */
 133                 D_ENCRYPT(r,l,28); /* 15 */
 134                 D_ENCRYPT(l,r,26); /* 14 */
 135                 D_ENCRYPT(r,l,24); /* 13 */
 136                 D_ENCRYPT(l,r,22); /* 12 */
 137                 D_ENCRYPT(r,l,20); /* 11 */
 138                 D_ENCRYPT(l,r,18); /* 10 */
 139                 D_ENCRYPT(r,l,16); /*  9 */
 140                 D_ENCRYPT(l,r,14); /*  8 */
 141                 D_ENCRYPT(r,l,12); /*  7 */
 142                 D_ENCRYPT(l,r,10); /*  6 */
 143                 D_ENCRYPT(r,l, 8); /*  5 */
 144                 D_ENCRYPT(l,r, 6); /*  4 */
 145                 D_ENCRYPT(r,l, 4); /*  3 */
 146                 D_ENCRYPT(l,r, 2); /*  2 */
 147                 D_ENCRYPT(r,l, 0); /*  1 */
 148 #else
 149                 for (i=30; i>0; i-=8)
 150                         {
 151                         D_ENCRYPT(l,r,i-0); /* 16 */
 152                         D_ENCRYPT(r,l,i-2); /* 15 */
 153                         D_ENCRYPT(l,r,i-4); /* 14 */
 154                         D_ENCRYPT(r,l,i-6); /* 13 */
 155                         }
 156 #endif
 157                 }
 158
 159         /* rotate and clear the top bits on machines with 8byte longs */
 160         l=ROTATE(l,3)&0xffffffffL;
 161         r=ROTATE(r,3)&0xffffffffL;
 162
 163         FP(r,l);
 164         data[0]=l;
 165         data[1]=r;
 166         l=r=t=u=0;
 167         }
 168
 169 #ifndef DES_ASM_FUNCTIONS
 170
 171 void des_encrypt2(data, ks, enc)
 172 DES_LONG *data;
 173 des_key_schedule ks;
 174 int enc;
 175         {
 176         register DES_LONG l,r,t,u;
 177 #ifdef DES_PTR
 178         register unsigned char *des_SP=(unsigned char *)des_SPtrans;
 179 #endif
 180 #ifndef DES_UNROLL
 181         register int i;
 182 #endif
 183         register DES_LONG *s;
 184
 185         r=data[0];
 186         l=data[1];
 187
 188         /* Things have been modified so that the initial rotate is
 189          * done outside the loop.  This required the
 190          * des_SPtrans values in sp.h to be rotated 1 bit to the right.
 191          * One perl script later and things have a 5% speed up on a sparc2.
 192          * Thanks to Richard Outerbridge <71755.204@CompuServe.COM>
 193          * for pointing this out. */
 194         /* clear the top bits on machines with 8byte longs */
 195         r=ROTATE(r,29)&0xffffffffL;
 196         l=ROTATE(l,29)&0xffffffffL;
 197
 198         s=(DES_LONG *)ks;
 199         /* I don't know if it is worth the effort of loop unrolling the
 200          * inner loop */
 201         if (enc)
 202                 {
 203 #ifdef DES_UNROLL
 204                 D_ENCRYPT(l,r, 0); /*  1 */
 205                 D_ENCRYPT(r,l, 2); /*  2 */
 206                 D_ENCRYPT(l,r, 4); /*  3 */
 207                 D_ENCRYPT(r,l, 6); /*  4 */
 208                 D_ENCRYPT(l,r, 8); /*  5 */
 209                 D_ENCRYPT(r,l,10); /*  6 */
 210                 D_ENCRYPT(l,r,12); /*  7 */
 211                 D_ENCRYPT(r,l,14); /*  8 */
 212                 D_ENCRYPT(l,r,16); /*  9 */
 213                 D_ENCRYPT(r,l,18); /*  10 */
 214                 D_ENCRYPT(l,r,20); /*  11 */
 215                 D_ENCRYPT(r,l,22); /*  12 */
 216                 D_ENCRYPT(l,r,24); /*  13 */
 217                 D_ENCRYPT(r,l,26); /*  14 */
 218                 D_ENCRYPT(l,r,28); /*  15 */
 219                 D_ENCRYPT(r,l,30); /*  16 */
 220 #else
 221                 for (i=0; i<32; i+=8)
 222                         {
 223                         D_ENCRYPT(l,r,i+0); /*  1 */
 224                         D_ENCRYPT(r,l,i+2); /*  2 */
 225                         D_ENCRYPT(l,r,i+4); /*  3 */
 226                         D_ENCRYPT(r,l,i+6); /*  4 */
 227                         }
 228 #endif
 229                 }
 230         else
 231                 {
 232 #ifdef DES_UNROLL
 233                 D_ENCRYPT(l,r,30); /* 16 */
 234                 D_ENCRYPT(r,l,28); /* 15 */
 235                 D_ENCRYPT(l,r,26); /* 14 */
 236                 D_ENCRYPT(r,l,24); /* 13 */
 237                 D_ENCRYPT(l,r,22); /* 12 */
 238                 D_ENCRYPT(r,l,20); /* 11 */
 239                 D_ENCRYPT(l,r,18); /* 10 */
 240                 D_ENCRYPT(r,l,16); /*  9 */
 241                 D_ENCRYPT(l,r,14); /*  8 */
 242                 D_ENCRYPT(r,l,12); /*  7 */
 243                 D_ENCRYPT(l,r,10); /*  6 */
 244                 D_ENCRYPT(r,l, 8); /*  5 */
 245                 D_ENCRYPT(l,r, 6); /*  4 */
 246                 D_ENCRYPT(r,l, 4); /*  3 */
 247                 D_ENCRYPT(l,r, 2); /*  2 */
 248                 D_ENCRYPT(r,l, 0); /*  1 */
 249 #else
 250                 for (i=30; i>0; i-=8)
 251                         {
 252                         D_ENCRYPT(l,r,i-0); /* 16 */
 253                         D_ENCRYPT(r,l,i-2); /* 15 */
 254                         D_ENCRYPT(l,r,i-4); /* 14 */
 255                         D_ENCRYPT(r,l,i-6); /* 13 */
 256                         }
 257 #endif
 258                 }
 259         /* rotate and clear the top bits on machines with 8byte longs */
 260         data[0]=ROTATE(l,3)&0xffffffffL;
 261         data[1]=ROTATE(r,3)&0xffffffffL;
 262         l=r=t=u=0;
 263         }
 264
 265 void des_encrypt3(data,ks1,ks2,ks3)
 266 DES_LONG *data;
 267 des_key_schedule ks1;
 268 des_key_schedule ks2;
 269 des_key_schedule ks3;
 270         {
 271         register DES_LONG l,r;
 272
 273         l=data[0];
 274         r=data[1];
 275         IP(l,r);
 276         data[0]=l;
 277         data[1]=r;
 278         des_encrypt2((DES_LONG *)data,ks1,DES_ENCRYPT);
 279         des_encrypt2((DES_LONG *)data,ks2,DES_DECRYPT);
 280         des_encrypt2((DES_LONG *)data,ks3,DES_ENCRYPT);
 281         l=data[0];
 282         r=data[1];
 283         FP(r,l);
 284         data[0]=l;
 285         data[1]=r;
 286         }
 287
 288 void des_decrypt3(data,ks1,ks2,ks3)
 289 DES_LONG *data;
 290 des_key_schedule ks1;
 291 des_key_schedule ks2;
 292 des_key_schedule ks3;
 293         {
 294         register DES_LONG l,r;
 295
 296         l=data[0];
 297         r=data[1];
 298         IP(l,r);
 299         data[0]=l;
 300         data[1]=r;
 301         des_encrypt2((DES_LONG *)data,ks3,DES_DECRYPT);
 302         des_encrypt2((DES_LONG *)data,ks2,DES_ENCRYPT);
 303         des_encrypt2((DES_LONG *)data,ks1,DES_DECRYPT);
 304         l=data[0];
 305         r=data[1];
 306         FP(r,l);
 307         data[0]=l;
 308         data[1]=r;
 309         }
 310
 311 #endif /* DES_ASM_FUNCTIONS */
 312
 313 #ifndef DES_DEFAULT_OPTIONS
 314
 315 void des_ncbc_encrypt(input, output, length, schedule, ivec, enc)
 316 des_cblock (*input);
 317 des_cblock (*output);
 318 long length;
 319 des_key_schedule schedule;
 320 des_cblock (*ivec);
 321 int enc;
 322         {
 323         register DES_LONG tin0,tin1;
 324         register DES_LONG tout0,tout1,xor0,xor1;
 325         register unsigned char *in,*out;
 326         register long l=length;
 327         DES_LONG tin[2];
 328         unsigned char *iv;
 329
 330 #ifdef HW_ASSIST
 331         if (hw_des_assist()) {
 332                 hw_des_ncbc_encrypt(input, output, length, schedule, ivec, enc);
 333                 return;
 334         }
 335 #endif
 336
 337         in=(unsigned char *)input;
 338         out=(unsigned char *)output;
 339         iv=(unsigned char *)ivec;
 340
 341         if (enc)
 342                 {
 343                 c2l(iv,tout0);
 344                 c2l(iv,tout1);
 345                 for (l-=8; l>=0; l-=8)
 346                         {
 347                         c2l(in,tin0);
 348                         c2l(in,tin1);
 349                         tin0^=tout0; tin[0]=tin0;
 350                         tin1^=tout1; tin[1]=tin1;
 351                         des_encrypt((DES_LONG *)tin,schedule,DES_ENCRYPT);
 352                         tout0=tin[0]; l2c(tout0,out);
 353                         tout1=tin[1]; l2c(tout1,out);
 354                         }
 355                 if (l != -8)
 356                         {
 357                         c2ln(in,tin0,tin1,l+8);
 358                         tin0^=tout0; tin[0]=tin0;
 359                         tin1^=tout1; tin[1]=tin1;
 360                         des_encrypt((DES_LONG *)tin,schedule,DES_ENCRYPT);
 361                         tout0=tin[0]; l2c(tout0,out);
 362                         tout1=tin[1]; l2c(tout1,out);
 363                         }
 364                 iv=(unsigned char *)ivec;
 365                 l2c(tout0,iv);
 366                 l2c(tout1,iv);
 367                 }
 368         else
 369                 {
 370                 c2l(iv,xor0);
 371                 c2l(iv,xor1);
 372                 for (l-=8; l>=0; l-=8)
 373                         {
 374                         c2l(in,tin0); tin[0]=tin0;
 375                         c2l(in,tin1); tin[1]=tin1;
 376                         des_encrypt((DES_LONG *)tin,schedule,DES_DECRYPT);
 377                         tout0=tin[0]^xor0;
 378                         tout1=tin[1]^xor1;
 379                         l2c(tout0,out);
 380                         l2c(tout1,out);
 381                         xor0=tin0;
 382                         xor1=tin1;
 383                         }
 384                 if (l != -8)
 385                         {
 386                         c2l(in,tin0); tin[0]=tin0;
 387                         c2l(in,tin1); tin[1]=tin1;
 388                         des_encrypt((DES_LONG *)tin,schedule,DES_DECRYPT);
 389                         tout0=tin[0]^xor0;
 390                         tout1=tin[1]^xor1;
 391                         l2cn(tout0,tout1,out,l+8);
 392                         xor0=tin0;
 393                         xor1=tin1;
 394                         }
 395
 396                 iv=(unsigned char *)ivec;
 397                 l2c(xor0,iv);
 398                 l2c(xor1,iv);
 399                 }
 400         tin0=tin1=tout0=tout1=xor0=xor1=0;
 401         tin[0]=tin[1]=0;
 402         }
 403
 404 void des_ede3_cbc_encrypt(input, output, length, ks1, ks2, ks3, ivec, enc)
 405 des_cblock (*input);
 406 des_cblock (*output);
 407 long length;
 408 des_key_schedule ks1;
 409 des_key_schedule ks2;
 410 des_key_schedule ks3;
 411 des_cblock (*ivec);
 412 int enc;
 413         {
 414         register DES_LONG tin0,tin1;
 415         register DES_LONG tout0,tout1,xor0,xor1;
 416         register unsigned char *in,*out;
 417         register long l=length;
 418         DES_LONG tin[2];
 419         unsigned char *iv;
 420
 421 #ifdef HW_ASSIST
 422         if (hw_des_assist()) {
 423                 hw_des_ede3_cbc_encrypt(input,output,length,ks1,ks2,ks3,ivec,enc);
 424                 return;
 425         }
 426 #endif
 427
 428         in=(unsigned char *)input;
 429         out=(unsigned char *)output;
 430         iv=(unsigned char *)ivec;
 431
 432         if (enc)
 433                 {
 434                 c2l(iv,tout0);
 435                 c2l(iv,tout1);
 436                 for (l-=8; l>=0; l-=8)
 437                         {
 438                         c2l(in,tin0);
 439                         c2l(in,tin1);
 440                         tin0^=tout0;
 441                         tin1^=tout1;
 442
 443                         tin[0]=tin0;
 444                         tin[1]=tin1;
 445                         des_encrypt3((DES_LONG *)tin,ks1,ks2,ks3);
 446                         tout0=tin[0];
 447                         tout1=tin[1];
 448
 449                         l2c(tout0,out);
 450                         l2c(tout1,out);
 451                         }
 452                 if (l != -8)
 453                         {
 454                         c2ln(in,tin0,tin1,l+8);
 455                         tin0^=tout0;
 456                         tin1^=tout1;
 457
 458                         tin[0]=tin0;
 459                         tin[1]=tin1;
 460                         des_encrypt3((DES_LONG *)tin,ks1,ks2,ks3);
 461                         tout0=tin[0];
 462                         tout1=tin[1];
 463
 464                         l2c(tout0,out);
 465                         l2c(tout1,out);
 466                         }
 467                 iv=(unsigned char *)ivec;
 468                 l2c(tout0,iv);
 469                 l2c(tout1,iv);
 470                 }
 471         else
 472                 {
 473                 register DES_LONG t0,t1;
 474
 475                 c2l(iv,xor0);
 476                 c2l(iv,xor1);
 477                 for (l-=8; l>=0; l-=8)
 478                         {
 479                         c2l(in,tin0);
 480                         c2l(in,tin1);
 481
 482                         t0=tin0;
 483                         t1=tin1;
 484
 485                         tin[0]=tin0;
 486                         tin[1]=tin1;
 487                         des_decrypt3((DES_LONG *)tin,ks1,ks2,ks3);
 488                         tout0=tin[0];
 489                         tout1=tin[1];
 490
 491                         tout0^=xor0;
 492                         tout1^=xor1;
 493                         l2c(tout0,out);
 494                         l2c(tout1,out);
 495                         xor0=t0;
 496                         xor1=t1;
 497                         }
 498                 if (l != -8)
 499                         {
 500                         c2l(in,tin0);
 501                         c2l(in,tin1);
 502
 503                         t0=tin0;
 504                         t1=tin1;
 505
 506                         tin[0]=tin0;
 507                         tin[1]=tin1;
 508                         des_decrypt3((DES_LONG *)tin,ks1,ks2,ks3);
 509                         tout0=tin[0];
 510                         tout1=tin[1];
 511
 512                         tout0^=xor0;
 513                         tout1^=xor1;
 514                         l2cn(tout0,tout1,out,l+8);
 515                         xor0=t0;
 516                         xor1=t1;
 517                         }
 518
 519                 iv=(unsigned char *)ivec;
 520                 l2c(xor0,iv);
 521                 l2c(xor1,iv);
 522                 }
 523         tin0=tin1=tout0=tout1=xor0=xor1=0;
 524         tin[0]=tin[1]=0;
 525         }
 526
 527 #endif /* DES_DEFAULT_OPTIONS */