crypto/des/des_enc.c

   1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   2  * All rights reserved.
   3  *
   4  * This package is an SSL implementation written
   5  * by Eric Young (eay@cryptsoft.com).
   6  * The implementation was written so as to conform with Netscapes SSL.
   7  *
   8  * This library is free for commercial and non-commercial use as long as
   9  * the following conditions are aheared to.  The following conditions
  10  * apply to all code found in this distribution, be it the RC4, RSA,
  11  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  12  * included with this distribution is covered by the same copyright terms
  13  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  14  *
  15  * Copyright remains Eric Young's, and as such any Copyright notices in
  16  * the code are not to be removed.
  17  * If this package is used in a product, Eric Young should be given attribution
  18  * as the author of the parts of the library used.
  19  * This can be in the form of a textual message at program startup or
  20  * in documentation (online or textual) provided with the package.
  21  *
  22  * Redistribution and use in source and binary forms, with or without
  23  * modification, are permitted provided that the following conditions
  24  * are met:
  25  * 1. Redistributions of source code must retain the copyright
  26  *    notice, this list of conditions and the following disclaimer.
  27  * 2. Redistributions in binary form must reproduce the above copyright
  28  *    notice, this list of conditions and the following disclaimer in the
  29  *    documentation and/or other materials provided with the distribution.
  30  * 3. All advertising materials mentioning features or use of this software
  31  *    must display the following acknowledgement:
  32  *    "This product includes cryptographic software written by
  33  *     Eric Young (eay@cryptsoft.com)"
  34  *    The word 'cryptographic' can be left out if the rouines from the library
  35  *    being used are not cryptographic related :-).
  36  * 4. If you include any Windows specific code (or a derivative thereof) from
  37  *    the apps directory (application code) you must include an acknowledgement:
  38  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  41  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  43  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  44  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  45  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  46  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  48  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  49  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  50  * SUCH DAMAGE.
  51  *
  52  * The licence and distribution terms for any publically available version or
  53  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  54  * copied and put under another distribution licence
  55  * [including the GNU Public Licence.]
  56  */
  57
  58 #include <openssl/crypto.h>
  59 #include "des_locl.h"
  60 #include "spr.h"
  61
  62 void DES_encrypt1(DES_LONG *data, DES_key_schedule *ks, int enc)
  63 {
  64     register DES_LONG l, r, t, u;
  65     register DES_LONG *s;
  66
  67     r = data[0];
  68     l = data[1];
  69
  70     IP(r, l);
  71     /*
  72      * Things have been modified so that the initial rotate is done outside
  73      * the loop.  This required the DES_SPtrans values in sp.h to be rotated
  74      * 1 bit to the right. One perl script later and things have a 5% speed
  75      * up on a sparc2. Thanks to Richard Outerbridge
  76      * <71755.204@CompuServe.COM> for pointing this out.
  77      */
  78     /* clear the top bits on machines with 8byte longs */
  79     /* shift left by 2 */
  80     r = ROTATE(r, 29) & 0xffffffffL;
  81     l = ROTATE(l, 29) & 0xffffffffL;
  82
  83     s = ks->ks->deslong;
  84     /*
  85      * I don't know if it is worth the effort of loop unrolling the inner
  86      * loop
  87      */
  88     if (enc) {
  89         D_ENCRYPT(l, r, 0);     /* 1 */
  90         D_ENCRYPT(r, l, 2);     /* 2 */
  91         D_ENCRYPT(l, r, 4);     /* 3 */
  92         D_ENCRYPT(r, l, 6);     /* 4 */
  93         D_ENCRYPT(l, r, 8);     /* 5 */
  94         D_ENCRYPT(r, l, 10);    /* 6 */
  95         D_ENCRYPT(l, r, 12);    /* 7 */
  96         D_ENCRYPT(r, l, 14);    /* 8 */
  97         D_ENCRYPT(l, r, 16);    /* 9 */
  98         D_ENCRYPT(r, l, 18);    /* 10 */
  99         D_ENCRYPT(l, r, 20);    /* 11 */
 100         D_ENCRYPT(r, l, 22);    /* 12 */
 101         D_ENCRYPT(l, r, 24);    /* 13 */
 102         D_ENCRYPT(r, l, 26);    /* 14 */
 103         D_ENCRYPT(l, r, 28);    /* 15 */
 104         D_ENCRYPT(r, l, 30);    /* 16 */
 105     } else {
 106         D_ENCRYPT(l, r, 30);    /* 16 */
 107         D_ENCRYPT(r, l, 28);    /* 15 */
 108         D_ENCRYPT(l, r, 26);    /* 14 */
 109         D_ENCRYPT(r, l, 24);    /* 13 */
 110         D_ENCRYPT(l, r, 22);    /* 12 */
 111         D_ENCRYPT(r, l, 20);    /* 11 */
 112         D_ENCRYPT(l, r, 18);    /* 10 */
 113         D_ENCRYPT(r, l, 16);    /* 9 */
 114         D_ENCRYPT(l, r, 14);    /* 8 */
 115         D_ENCRYPT(r, l, 12);    /* 7 */
 116         D_ENCRYPT(l, r, 10);    /* 6 */
 117         D_ENCRYPT(r, l, 8);     /* 5 */
 118         D_ENCRYPT(l, r, 6);     /* 4 */
 119         D_ENCRYPT(r, l, 4);     /* 3 */
 120         D_ENCRYPT(l, r, 2);     /* 2 */
 121         D_ENCRYPT(r, l, 0);     /* 1 */
 122     }
 123
 124     /* rotate and clear the top bits on machines with 8byte longs */
 125     l = ROTATE(l, 3) & 0xffffffffL;
 126     r = ROTATE(r, 3) & 0xffffffffL;
 127
 128     FP(r, l);
 129     data[0] = l;
 130     data[1] = r;
 131     l = r = t = u = 0;
 132 }
 133
 134 void DES_encrypt2(DES_LONG *data, DES_key_schedule *ks, int enc)
 135 {
 136     register DES_LONG l, r, t, u;
 137     register DES_LONG *s;
 138
 139     r = data[0];
 140     l = data[1];
 141
 142     /*
 143      * Things have been modified so that the initial rotate is done outside
 144      * the loop.  This required the DES_SPtrans values in sp.h to be rotated
 145      * 1 bit to the right. One perl script later and things have a 5% speed
 146      * up on a sparc2. Thanks to Richard Outerbridge
 147      * <71755.204@CompuServe.COM> for pointing this out.
 148      */
 149     /* clear the top bits on machines with 8byte longs */
 150     r = ROTATE(r, 29) & 0xffffffffL;
 151     l = ROTATE(l, 29) & 0xffffffffL;
 152
 153     s = ks->ks->deslong;
 154     /*
 155      * I don't know if it is worth the effort of loop unrolling the inner
 156      * loop
 157      */
 158     if (enc) {
 159         D_ENCRYPT(l, r, 0);     /* 1 */
 160         D_ENCRYPT(r, l, 2);     /* 2 */
 161         D_ENCRYPT(l, r, 4);     /* 3 */
 162         D_ENCRYPT(r, l, 6);     /* 4 */
 163         D_ENCRYPT(l, r, 8);     /* 5 */
 164         D_ENCRYPT(r, l, 10);    /* 6 */
 165         D_ENCRYPT(l, r, 12);    /* 7 */
 166         D_ENCRYPT(r, l, 14);    /* 8 */
 167         D_ENCRYPT(l, r, 16);    /* 9 */
 168         D_ENCRYPT(r, l, 18);    /* 10 */
 169         D_ENCRYPT(l, r, 20);    /* 11 */
 170         D_ENCRYPT(r, l, 22);    /* 12 */
 171         D_ENCRYPT(l, r, 24);    /* 13 */
 172         D_ENCRYPT(r, l, 26);    /* 14 */
 173         D_ENCRYPT(l, r, 28);    /* 15 */
 174         D_ENCRYPT(r, l, 30);    /* 16 */
 175     } else {
 176         D_ENCRYPT(l, r, 30);    /* 16 */
 177         D_ENCRYPT(r, l, 28);    /* 15 */
 178         D_ENCRYPT(l, r, 26);    /* 14 */
 179         D_ENCRYPT(r, l, 24);    /* 13 */
 180         D_ENCRYPT(l, r, 22);    /* 12 */
 181         D_ENCRYPT(r, l, 20);    /* 11 */
 182         D_ENCRYPT(l, r, 18);    /* 10 */
 183         D_ENCRYPT(r, l, 16);    /* 9 */
 184         D_ENCRYPT(l, r, 14);    /* 8 */
 185         D_ENCRYPT(r, l, 12);    /* 7 */
 186         D_ENCRYPT(l, r, 10);    /* 6 */
 187         D_ENCRYPT(r, l, 8);     /* 5 */
 188         D_ENCRYPT(l, r, 6);     /* 4 */
 189         D_ENCRYPT(r, l, 4);     /* 3 */
 190         D_ENCRYPT(l, r, 2);     /* 2 */
 191         D_ENCRYPT(r, l, 0);     /* 1 */
 192     }
 193     /* rotate and clear the top bits on machines with 8byte longs */
 194     data[0] = ROTATE(l, 3) & 0xffffffffL;
 195     data[1] = ROTATE(r, 3) & 0xffffffffL;
 196     l = r = t = u = 0;
 197 }
 198
 199 void DES_encrypt3(DES_LONG *data, DES_key_schedule *ks1,
 200                   DES_key_schedule *ks2, DES_key_schedule *ks3)
 201 {
 202     register DES_LONG l, r;
 203
 204     l = data[0];
 205     r = data[1];
 206     IP(l, r);
 207     data[0] = l;
 208     data[1] = r;
 209     DES_encrypt2((DES_LONG *)data, ks1, DES_ENCRYPT);
 210     DES_encrypt2((DES_LONG *)data, ks2, DES_DECRYPT);
 211     DES_encrypt2((DES_LONG *)data, ks3, DES_ENCRYPT);
 212     l = data[0];
 213     r = data[1];
 214     FP(r, l);
 215     data[0] = l;
 216     data[1] = r;
 217 }
 218
 219 void DES_decrypt3(DES_LONG *data, DES_key_schedule *ks1,
 220                   DES_key_schedule *ks2, DES_key_schedule *ks3)
 221 {
 222     register DES_LONG l, r;
 223
 224     l = data[0];
 225     r = data[1];
 226     IP(l, r);
 227     data[0] = l;
 228     data[1] = r;
 229     DES_encrypt2((DES_LONG *)data, ks3, DES_DECRYPT);
 230     DES_encrypt2((DES_LONG *)data, ks2, DES_ENCRYPT);
 231     DES_encrypt2((DES_LONG *)data, ks1, DES_DECRYPT);
 232     l = data[0];
 233     r = data[1];
 234     FP(r, l);
 235     data[0] = l;
 236     data[1] = r;
 237 }
 238
 239 #ifndef DES_DEFAULT_OPTIONS
 240
 241 # undef CBC_ENC_C__DONT_UPDATE_IV
 242 # include "ncbc_enc.c"          /* DES_ncbc_encrypt */
 243
 244 void DES_ede3_cbc_encrypt(const unsigned char *input, unsigned char *output,
 245                           long length, DES_key_schedule *ks1,
 246                           DES_key_schedule *ks2, DES_key_schedule *ks3,
 247                           DES_cblock *ivec, int enc)
 248 {
 249     register DES_LONG tin0, tin1;
 250     register DES_LONG tout0, tout1, xor0, xor1;
 251     register const unsigned char *in;
 252     unsigned char *out;
 253     register long l = length;
 254     DES_LONG tin[2];
 255     unsigned char *iv;
 256
 257     in = input;
 258     out = output;
 259     iv = &(*ivec)[0];
 260
 261     if (enc) {
 262         c2l(iv, tout0);
 263         c2l(iv, tout1);
 264         for (l -= 8; l >= 0; l -= 8) {
 265             c2l(in, tin0);
 266             c2l(in, tin1);
 267             tin0 ^= tout0;
 268             tin1 ^= tout1;
 269
 270             tin[0] = tin0;
 271             tin[1] = tin1;
 272             DES_encrypt3((DES_LONG *)tin, ks1, ks2, ks3);
 273             tout0 = tin[0];
 274             tout1 = tin[1];
 275
 276             l2c(tout0, out);
 277             l2c(tout1, out);
 278         }
 279         if (l != -8) {
 280             c2ln(in, tin0, tin1, l + 8);
 281             tin0 ^= tout0;
 282             tin1 ^= tout1;
 283
 284             tin[0] = tin0;
 285             tin[1] = tin1;
 286             DES_encrypt3((DES_LONG *)tin, ks1, ks2, ks3);
 287             tout0 = tin[0];
 288             tout1 = tin[1];
 289
 290             l2c(tout0, out);
 291             l2c(tout1, out);
 292         }
 293         iv = &(*ivec)[0];
 294         l2c(tout0, iv);
 295         l2c(tout1, iv);
 296     } else {
 297         register DES_LONG t0, t1;
 298
 299         c2l(iv, xor0);
 300         c2l(iv, xor1);
 301         for (l -= 8; l >= 0; l -= 8) {
 302             c2l(in, tin0);
 303             c2l(in, tin1);
 304
 305             t0 = tin0;
 306             t1 = tin1;
 307
 308             tin[0] = tin0;
 309             tin[1] = tin1;
 310             DES_decrypt3((DES_LONG *)tin, ks1, ks2, ks3);
 311             tout0 = tin[0];
 312             tout1 = tin[1];
 313
 314             tout0 ^= xor0;
 315             tout1 ^= xor1;
 316             l2c(tout0, out);
 317             l2c(tout1, out);
 318             xor0 = t0;
 319             xor1 = t1;
 320         }
 321         if (l != -8) {
 322             c2l(in, tin0);
 323             c2l(in, tin1);
 324
 325             t0 = tin0;
 326             t1 = tin1;
 327
 328             tin[0] = tin0;
 329             tin[1] = tin1;
 330             DES_decrypt3((DES_LONG *)tin, ks1, ks2, ks3);
 331             tout0 = tin[0];
 332             tout1 = tin[1];
 333
 334             tout0 ^= xor0;
 335             tout1 ^= xor1;
 336             l2cn(tout0, tout1, out, l + 8);
 337             xor0 = t0;
 338             xor1 = t1;
 339         }
 340
 341         iv = &(*ivec)[0];
 342         l2c(xor0, iv);
 343         l2c(xor1, iv);
 344     }
 345     tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0;
 346     tin[0] = tin[1] = 0;
 347 }
 348
 349 #endif                          /* DES_DEFAULT_OPTIONS */