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(DES_LONG *data, des_key_schedule ks, int enc)
  62         {
  63         register DES_LONG l,r,t,u;
  64 #ifdef DES_PTR
  65         register const unsigned char *des_SP=(const unsigned char *)des_SPtrans;
  66 #endif
  67 #ifndef DES_UNROLL
  68         register int i;
  69 #endif
  70         register DES_LONG *s;
  71
  72         r=data[0];
  73         l=data[1];
  74
  75         IP(r,l);
  76         /* Things have been modified so that the initial rotate is
  77          * done outside the loop.  This required the
  78          * des_SPtrans values in sp.h to be rotated 1 bit to the right.
  79          * One perl script later and things have a 5% speed up on a sparc2.
  80          * Thanks to Richard Outerbridge <71755.204@CompuServe.COM>
  81          * for pointing this out. */
  82         /* clear the top bits on machines with 8byte longs */
  83         /* shift left by 2 */
  84         r=ROTATE(r,29)&0xffffffffL;
  85         l=ROTATE(l,29)&0xffffffffL;
  86
  87         s=ks->ks.deslong;
  88         /* I don't know if it is worth the effort of loop unrolling the
  89          * inner loop */
  90         if (enc)
  91                 {
  92 #ifdef DES_UNROLL
  93                 D_ENCRYPT(l,r, 0); /*  1 */
  94                 D_ENCRYPT(r,l, 2); /*  2 */
  95                 D_ENCRYPT(l,r, 4); /*  3 */
  96                 D_ENCRYPT(r,l, 6); /*  4 */
  97                 D_ENCRYPT(l,r, 8); /*  5 */
  98                 D_ENCRYPT(r,l,10); /*  6 */
  99                 D_ENCRYPT(l,r,12); /*  7 */
 100                 D_ENCRYPT(r,l,14); /*  8 */
 101                 D_ENCRYPT(l,r,16); /*  9 */
 102                 D_ENCRYPT(r,l,18); /*  10 */
 103                 D_ENCRYPT(l,r,20); /*  11 */
 104                 D_ENCRYPT(r,l,22); /*  12 */
 105                 D_ENCRYPT(l,r,24); /*  13 */
 106                 D_ENCRYPT(r,l,26); /*  14 */
 107                 D_ENCRYPT(l,r,28); /*  15 */
 108                 D_ENCRYPT(r,l,30); /*  16 */
 109 #else
 110                 for (i=0; i<32; i+=8)
 111                         {
 112                         D_ENCRYPT(l,r,i+0); /*  1 */
 113                         D_ENCRYPT(r,l,i+2); /*  2 */
 114                         D_ENCRYPT(l,r,i+4); /*  3 */
 115                         D_ENCRYPT(r,l,i+6); /*  4 */
 116                         }
 117 #endif
 118                 }
 119         else
 120                 {
 121 #ifdef DES_UNROLL
 122                 D_ENCRYPT(l,r,30); /* 16 */
 123                 D_ENCRYPT(r,l,28); /* 15 */
 124                 D_ENCRYPT(l,r,26); /* 14 */
 125                 D_ENCRYPT(r,l,24); /* 13 */
 126                 D_ENCRYPT(l,r,22); /* 12 */
 127                 D_ENCRYPT(r,l,20); /* 11 */
 128                 D_ENCRYPT(l,r,18); /* 10 */
 129                 D_ENCRYPT(r,l,16); /*  9 */
 130                 D_ENCRYPT(l,r,14); /*  8 */
 131                 D_ENCRYPT(r,l,12); /*  7 */
 132                 D_ENCRYPT(l,r,10); /*  6 */
 133                 D_ENCRYPT(r,l, 8); /*  5 */
 134                 D_ENCRYPT(l,r, 6); /*  4 */
 135                 D_ENCRYPT(r,l, 4); /*  3 */
 136                 D_ENCRYPT(l,r, 2); /*  2 */
 137                 D_ENCRYPT(r,l, 0); /*  1 */
 138 #else
 139                 for (i=30; i>0; i-=8)
 140                         {
 141                         D_ENCRYPT(l,r,i-0); /* 16 */
 142                         D_ENCRYPT(r,l,i-2); /* 15 */
 143                         D_ENCRYPT(l,r,i-4); /* 14 */
 144                         D_ENCRYPT(r,l,i-6); /* 13 */
 145                         }
 146 #endif
 147                 }
 148
 149         /* rotate and clear the top bits on machines with 8byte longs */
 150         l=ROTATE(l,3)&0xffffffffL;
 151         r=ROTATE(r,3)&0xffffffffL;
 152
 153         FP(r,l);
 154         data[0]=l;
 155         data[1]=r;
 156         l=r=t=u=0;
 157         }
 158
 159 void des_encrypt2(DES_LONG *data, des_key_schedule ks, int enc)
 160         {
 161         register DES_LONG l,r,t,u;
 162 #ifdef DES_PTR
 163         register const unsigned char *des_SP=(const unsigned char *)des_SPtrans;
 164 #endif
 165 #ifndef DES_UNROLL
 166         register int i;
 167 #endif
 168         register DES_LONG *s;
 169
 170         r=data[0];
 171         l=data[1];
 172
 173         /* Things have been modified so that the initial rotate is
 174          * done outside the loop.  This required the
 175          * des_SPtrans values in sp.h to be rotated 1 bit to the right.
 176          * One perl script later and things have a 5% speed up on a sparc2.
 177          * Thanks to Richard Outerbridge <71755.204@CompuServe.COM>
 178          * for pointing this out. */
 179         /* clear the top bits on machines with 8byte longs */
 180         r=ROTATE(r,29)&0xffffffffL;
 181         l=ROTATE(l,29)&0xffffffffL;
 182
 183         s=ks->ks.deslong;
 184         /* I don't know if it is worth the effort of loop unrolling the
 185          * inner loop */
 186         if (enc)
 187                 {
 188 #ifdef DES_UNROLL
 189                 D_ENCRYPT(l,r, 0); /*  1 */
 190                 D_ENCRYPT(r,l, 2); /*  2 */
 191                 D_ENCRYPT(l,r, 4); /*  3 */
 192                 D_ENCRYPT(r,l, 6); /*  4 */
 193                 D_ENCRYPT(l,r, 8); /*  5 */
 194                 D_ENCRYPT(r,l,10); /*  6 */
 195                 D_ENCRYPT(l,r,12); /*  7 */
 196                 D_ENCRYPT(r,l,14); /*  8 */
 197                 D_ENCRYPT(l,r,16); /*  9 */
 198                 D_ENCRYPT(r,l,18); /*  10 */
 199                 D_ENCRYPT(l,r,20); /*  11 */
 200                 D_ENCRYPT(r,l,22); /*  12 */
 201                 D_ENCRYPT(l,r,24); /*  13 */
 202                 D_ENCRYPT(r,l,26); /*  14 */
 203                 D_ENCRYPT(l,r,28); /*  15 */
 204                 D_ENCRYPT(r,l,30); /*  16 */
 205 #else
 206                 for (i=0; i<32; i+=8)
 207                         {
 208                         D_ENCRYPT(l,r,i+0); /*  1 */
 209                         D_ENCRYPT(r,l,i+2); /*  2 */
 210                         D_ENCRYPT(l,r,i+4); /*  3 */
 211                         D_ENCRYPT(r,l,i+6); /*  4 */
 212                         }
 213 #endif
 214                 }
 215         else
 216                 {
 217 #ifdef DES_UNROLL
 218                 D_ENCRYPT(l,r,30); /* 16 */
 219                 D_ENCRYPT(r,l,28); /* 15 */
 220                 D_ENCRYPT(l,r,26); /* 14 */
 221                 D_ENCRYPT(r,l,24); /* 13 */
 222                 D_ENCRYPT(l,r,22); /* 12 */
 223                 D_ENCRYPT(r,l,20); /* 11 */
 224                 D_ENCRYPT(l,r,18); /* 10 */
 225                 D_ENCRYPT(r,l,16); /*  9 */
 226                 D_ENCRYPT(l,r,14); /*  8 */
 227                 D_ENCRYPT(r,l,12); /*  7 */
 228                 D_ENCRYPT(l,r,10); /*  6 */
 229                 D_ENCRYPT(r,l, 8); /*  5 */
 230                 D_ENCRYPT(l,r, 6); /*  4 */
 231                 D_ENCRYPT(r,l, 4); /*  3 */
 232                 D_ENCRYPT(l,r, 2); /*  2 */
 233                 D_ENCRYPT(r,l, 0); /*  1 */
 234 #else
 235                 for (i=30; i>0; i-=8)
 236                         {
 237                         D_ENCRYPT(l,r,i-0); /* 16 */
 238                         D_ENCRYPT(r,l,i-2); /* 15 */
 239                         D_ENCRYPT(l,r,i-4); /* 14 */
 240                         D_ENCRYPT(r,l,i-6); /* 13 */
 241                         }
 242 #endif
 243                 }
 244         /* rotate and clear the top bits on machines with 8byte longs */
 245         data[0]=ROTATE(l,3)&0xffffffffL;
 246         data[1]=ROTATE(r,3)&0xffffffffL;
 247         l=r=t=u=0;
 248         }
 249
 250 void des_encrypt3(DES_LONG *data, des_key_schedule ks1, des_key_schedule ks2,
 251              des_key_schedule ks3)
 252         {
 253         register DES_LONG l,r;
 254
 255         l=data[0];
 256         r=data[1];
 257         IP(l,r);
 258         data[0]=l;
 259         data[1]=r;
 260         des_encrypt2((DES_LONG *)data,ks1,DES_ENCRYPT);
 261         des_encrypt2((DES_LONG *)data,ks2,DES_DECRYPT);
 262         des_encrypt2((DES_LONG *)data,ks3,DES_ENCRYPT);
 263         l=data[0];
 264         r=data[1];
 265         FP(r,l);
 266         data[0]=l;
 267         data[1]=r;
 268         }
 269
 270 void des_decrypt3(DES_LONG *data, des_key_schedule ks1, des_key_schedule ks2,
 271              des_key_schedule ks3)
 272         {
 273         register DES_LONG l,r;
 274
 275         l=data[0];
 276         r=data[1];
 277         IP(l,r);
 278         data[0]=l;
 279         data[1]=r;
 280         des_encrypt2((DES_LONG *)data,ks3,DES_DECRYPT);
 281         des_encrypt2((DES_LONG *)data,ks2,DES_ENCRYPT);
 282         des_encrypt2((DES_LONG *)data,ks1,DES_DECRYPT);
 283         l=data[0];
 284         r=data[1];
 285         FP(r,l);
 286         data[0]=l;
 287         data[1]=r;
 288         }
 289
 290 #ifndef DES_DEFAULT_OPTIONS
 291
 292 void des_ncbc_encrypt(const unsigned char *in, unsigned char *out, long length,
 293              des_key_schedule schedule, des_cblock *ivec, int enc)
 294         {
 295         register DES_LONG tin0,tin1;
 296         register DES_LONG tout0,tout1,xor0,xor1;
 297         register long l=length;
 298         DES_LONG tin[2];
 299         unsigned char *iv;
 300
 301         iv = &(*ivec)[0];
 302
 303         if (enc)
 304                 {
 305                 c2l(iv,tout0);
 306                 c2l(iv,tout1);
 307                 for (l-=8; l>=0; l-=8)
 308                         {
 309                         c2l(in,tin0);
 310                         c2l(in,tin1);
 311                         tin0^=tout0; tin[0]=tin0;
 312                         tin1^=tout1; tin[1]=tin1;
 313                         des_encrypt((DES_LONG *)tin,schedule,DES_ENCRYPT);
 314                         tout0=tin[0]; l2c(tout0,out);
 315                         tout1=tin[1]; l2c(tout1,out);
 316                         }
 317                 if (l != -8)
 318                         {
 319                         c2ln(in,tin0,tin1,l+8);
 320                         tin0^=tout0; tin[0]=tin0;
 321                         tin1^=tout1; tin[1]=tin1;
 322                         des_encrypt((DES_LONG *)tin,schedule,DES_ENCRYPT);
 323                         tout0=tin[0]; l2c(tout0,out);
 324                         tout1=tin[1]; l2c(tout1,out);
 325                         }
 326                 iv = &(*ivec)[0];
 327                 l2c(tout0,iv);
 328                 l2c(tout1,iv);
 329                 }
 330         else
 331                 {
 332                 c2l(iv,xor0);
 333                 c2l(iv,xor1);
 334                 for (l-=8; l>=0; l-=8)
 335                         {
 336                         c2l(in,tin0); tin[0]=tin0;
 337                         c2l(in,tin1); tin[1]=tin1;
 338                         des_encrypt((DES_LONG *)tin,schedule,DES_DECRYPT);
 339                         tout0=tin[0]^xor0;
 340                         tout1=tin[1]^xor1;
 341                         l2c(tout0,out);
 342                         l2c(tout1,out);
 343                         xor0=tin0;
 344                         xor1=tin1;
 345                         }
 346                 if (l != -8)
 347                         {
 348                         c2l(in,tin0); tin[0]=tin0;
 349                         c2l(in,tin1); tin[1]=tin1;
 350                         des_encrypt((DES_LONG *)tin,schedule,DES_DECRYPT);
 351                         tout0=tin[0]^xor0;
 352                         tout1=tin[1]^xor1;
 353                         l2cn(tout0,tout1,out,l+8);
 354                         xor0=tin0;
 355                         xor1=tin1;
 356                         }
 357
 358                 iv = &(*ivec)[0];
 359                 l2c(xor0,iv);
 360                 l2c(xor1,iv);
 361                 }
 362         tin0=tin1=tout0=tout1=xor0=xor1=0;
 363         tin[0]=tin[1]=0;
 364         }
 365
 366 void des_ede3_cbc_encrypt(const unsigned char *input, unsigned char *output,
 367              long length, des_key_schedule ks1, des_key_schedule ks2,
 368              des_key_schedule ks3, des_cblock *ivec, int enc)
 369         {
 370         register DES_LONG tin0,tin1;
 371         register DES_LONG tout0,tout1,xor0,xor1;
 372         register const unsigned char *in;
 373         unsigned char *out;
 374         register long l=length;
 375         DES_LONG tin[2];
 376         unsigned char *iv;
 377
 378         in=input;
 379         out=output;
 380         iv = &(*ivec)[0];
 381
 382         if (enc)
 383                 {
 384                 c2l(iv,tout0);
 385                 c2l(iv,tout1);
 386                 for (l-=8; l>=0; l-=8)
 387                         {
 388                         c2l(in,tin0);
 389                         c2l(in,tin1);
 390                         tin0^=tout0;
 391                         tin1^=tout1;
 392
 393                         tin[0]=tin0;
 394                         tin[1]=tin1;
 395                         des_encrypt3((DES_LONG *)tin,ks1,ks2,ks3);
 396                         tout0=tin[0];
 397                         tout1=tin[1];
 398
 399                         l2c(tout0,out);
 400                         l2c(tout1,out);
 401                         }
 402                 if (l != -8)
 403                         {
 404                         c2ln(in,tin0,tin1,l+8);
 405                         tin0^=tout0;
 406                         tin1^=tout1;
 407
 408                         tin[0]=tin0;
 409                         tin[1]=tin1;
 410                         des_encrypt3((DES_LONG *)tin,ks1,ks2,ks3);
 411                         tout0=tin[0];
 412                         tout1=tin[1];
 413
 414                         l2c(tout0,out);
 415                         l2c(tout1,out);
 416                         }
 417                 iv = &(*ivec)[0];
 418                 l2c(tout0,iv);
 419                 l2c(tout1,iv);
 420                 }
 421         else
 422                 {
 423                 register DES_LONG t0,t1;
 424
 425                 c2l(iv,xor0);
 426                 c2l(iv,xor1);
 427                 for (l-=8; l>=0; l-=8)
 428                         {
 429                         c2l(in,tin0);
 430                         c2l(in,tin1);
 431
 432                         t0=tin0;
 433                         t1=tin1;
 434
 435                         tin[0]=tin0;
 436                         tin[1]=tin1;
 437                         des_decrypt3((DES_LONG *)tin,ks1,ks2,ks3);
 438                         tout0=tin[0];
 439                         tout1=tin[1];
 440
 441                         tout0^=xor0;
 442                         tout1^=xor1;
 443                         l2c(tout0,out);
 444                         l2c(tout1,out);
 445                         xor0=t0;
 446                         xor1=t1;
 447                         }
 448                 if (l != -8)
 449                         {
 450                         c2l(in,tin0);
 451                         c2l(in,tin1);
 452
 453                         t0=tin0;
 454                         t1=tin1;
 455
 456                         tin[0]=tin0;
 457                         tin[1]=tin1;
 458                         des_decrypt3((DES_LONG *)tin,ks1,ks2,ks3);
 459                         tout0=tin[0];
 460                         tout1=tin[1];
 461
 462                         tout0^=xor0;
 463                         tout1^=xor1;
 464                         l2cn(tout0,tout1,out,l+8);
 465                         xor0=t0;
 466                         xor1=t1;
 467                         }
 468
 469                 iv = &(*ivec)[0];
 470                 l2c(xor0,iv);
 471                 l2c(xor1,iv);
 472                 }
 473         tin0=tin1=tout0=tout1=xor0=xor1=0;
 474         tin[0]=tin[1]=0;
 475         }
 476
 477 #endif /* DES_DEFAULT_OPTIONS */