lib/libcrypto/des/des_locl.h

   1 /* $OpenBSD: des_locl.h,v 1.19 2016/12/21 15:49:29 jsing Exp $ */
   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 #ifndef HEADER_DES_LOCL_H
  60 #define HEADER_DES_LOCL_H
  61
  62 #include <math.h>
  63 #include <stdint.h>
  64 #include <stdio.h>
  65 #include <stdlib.h>
  66 #include <string.h>
  67 #include <unistd.h>
  68
  69 #include <openssl/opensslconf.h>
  70
  71 #include <openssl/des.h>
  72
  73 __BEGIN_HIDDEN_DECLS
  74
  75 #define ITERATIONS 16
  76 #define HALF_ITERATIONS 8
  77
  78 /* used in des_read and des_write */
  79 #define MAXWRITE        (1024*16)
  80 #define BSIZE           (MAXWRITE+4)
  81
  82 #define c2l(c,l)        (l =((DES_LONG)(*((c)++)))    , \
  83                          l|=((DES_LONG)(*((c)++)))<< 8L, \
  84                          l|=((DES_LONG)(*((c)++)))<<16L, \
  85                          l|=((DES_LONG)(*((c)++)))<<24L)
  86
  87 /* NOTE - c is not incremented as per c2l */
  88 #define c2ln(c,l1,l2,n) { \
  89                         c+=n; \
  90                         l1=l2=0; \
  91                         switch (n) { \
  92                         case 8: l2 =((DES_LONG)(*(--(c))))<<24L; \
  93                         case 7: l2|=((DES_LONG)(*(--(c))))<<16L; \
  94                         case 6: l2|=((DES_LONG)(*(--(c))))<< 8L; \
  95                         case 5: l2|=((DES_LONG)(*(--(c))));     \
  96                         case 4: l1 =((DES_LONG)(*(--(c))))<<24L; \
  97                         case 3: l1|=((DES_LONG)(*(--(c))))<<16L; \
  98                         case 2: l1|=((DES_LONG)(*(--(c))))<< 8L; \
  99                         case 1: l1|=((DES_LONG)(*(--(c))));     \
 100                                 } \
 101                         }
 102
 103 #define l2c(l,c)        (*((c)++)=(unsigned char)(((l)     )&0xff), \
 104                          *((c)++)=(unsigned char)(((l)>> 8L)&0xff), \
 105                          *((c)++)=(unsigned char)(((l)>>16L)&0xff), \
 106                          *((c)++)=(unsigned char)(((l)>>24L)&0xff))
 107
 108 /* replacements for htonl and ntohl since I have no idea what to do
 109  * when faced with machines with 8 byte longs. */
 110 #define HDRSIZE 4
 111
 112 #define n2l(c,l)        (l =((DES_LONG)(*((c)++)))<<24L, \
 113                          l|=((DES_LONG)(*((c)++)))<<16L, \
 114                          l|=((DES_LONG)(*((c)++)))<< 8L, \
 115                          l|=((DES_LONG)(*((c)++))))
 116
 117 #define l2n(l,c)        (*((c)++)=(unsigned char)(((l)>>24L)&0xff), \
 118                          *((c)++)=(unsigned char)(((l)>>16L)&0xff), \
 119                          *((c)++)=(unsigned char)(((l)>> 8L)&0xff), \
 120                          *((c)++)=(unsigned char)(((l)     )&0xff))
 121
 122 /* NOTE - c is not incremented as per l2c */
 123 #define l2cn(l1,l2,c,n) { \
 124                         c+=n; \
 125                         switch (n) { \
 126                         case 8: *(--(c))=(unsigned char)(((l2)>>24L)&0xff); \
 127                         case 7: *(--(c))=(unsigned char)(((l2)>>16L)&0xff); \
 128                         case 6: *(--(c))=(unsigned char)(((l2)>> 8L)&0xff); \
 129                         case 5: *(--(c))=(unsigned char)(((l2)     )&0xff); \
 130                         case 4: *(--(c))=(unsigned char)(((l1)>>24L)&0xff); \
 131                         case 3: *(--(c))=(unsigned char)(((l1)>>16L)&0xff); \
 132                         case 2: *(--(c))=(unsigned char)(((l1)>> 8L)&0xff); \
 133                         case 1: *(--(c))=(unsigned char)(((l1)     )&0xff); \
 134                                 } \
 135                         }
 136
 137 static inline uint32_t ROTATE(uint32_t a, uint32_t n)
 138 {
 139         return (a>>n)+(a<<(32-n));
 140 }
 141
 142 /* Don't worry about the LOAD_DATA() stuff, that is used by
 143  * fcrypt() to add it's little bit to the front */
 144
 145 #ifdef DES_FCRYPT
 146
 147 #define LOAD_DATA_tmp(R,S,u,t,E0,E1) \
 148         { DES_LONG tmp; LOAD_DATA(R,S,u,t,E0,E1,tmp); }
 149
 150 #define LOAD_DATA(R,S,u,t,E0,E1,tmp) \
 151         t=R^(R>>16L); \
 152         u=t&E0; t&=E1; \
 153         tmp=(u<<16); u^=R^s[S  ]; u^=tmp; \
 154         tmp=(t<<16); t^=R^s[S+1]; t^=tmp
 155 #else
 156 #define LOAD_DATA_tmp(a,b,c,d,e,f) LOAD_DATA(a,b,c,d,e,f,g)
 157 #define LOAD_DATA(R,S,u,t,E0,E1,tmp) \
 158         u=R^s[S  ]; \
 159         t=R^s[S+1]
 160 #endif
 161
 162 /* The changes to this macro may help or hinder, depending on the
 163  * compiler and the architecture.  gcc2 always seems to do well :-).
 164  * Inspired by Dana How <how@isl.stanford.edu>
 165  * DO NOT use the alternative version on machines with 8 byte longs.
 166  * It does not seem to work on the Alpha, even when DES_LONG is 4
 167  * bytes, probably an issue of accessing non-word aligned objects :-( */
 168 #ifdef DES_PTR
 169
 170 /* It recently occurred to me that 0^0^0^0^0^0^0 == 0, so there
 171  * is no reason to not xor all the sub items together.  This potentially
 172  * saves a register since things can be xored directly into L */
 173
 174 #if defined(DES_RISC1) || defined(DES_RISC2)
 175 #ifdef DES_RISC1
 176 #define D_ENCRYPT(LL,R,S) { \
 177         unsigned int u1,u2,u3; \
 178         LOAD_DATA(R,S,u,t,E0,E1,u1); \
 179         u2=(int)u>>8L; \
 180         u1=(int)u&0xfc; \
 181         u2&=0xfc; \
 182         t=ROTATE(t,4); \
 183         u>>=16L; \
 184         LL^= *(const DES_LONG *)(des_SP      +u1); \
 185         LL^= *(const DES_LONG *)(des_SP+0x200+u2); \
 186         u3=(int)(u>>8L); \
 187         u1=(int)u&0xfc; \
 188         u3&=0xfc; \
 189         LL^= *(const DES_LONG *)(des_SP+0x400+u1); \
 190         LL^= *(const DES_LONG *)(des_SP+0x600+u3); \
 191         u2=(int)t>>8L; \
 192         u1=(int)t&0xfc; \
 193         u2&=0xfc; \
 194         t>>=16L; \
 195         LL^= *(const DES_LONG *)(des_SP+0x100+u1); \
 196         LL^= *(const DES_LONG *)(des_SP+0x300+u2); \
 197         u3=(int)t>>8L; \
 198         u1=(int)t&0xfc; \
 199         u3&=0xfc; \
 200         LL^= *(const DES_LONG *)(des_SP+0x500+u1); \
 201         LL^= *(const DES_LONG *)(des_SP+0x700+u3); }
 202 #endif
 203 #ifdef DES_RISC2
 204 #define D_ENCRYPT(LL,R,S) { \
 205         unsigned int u1,u2,s1,s2; \
 206         LOAD_DATA(R,S,u,t,E0,E1,u1); \
 207         u2=(int)u>>8L; \
 208         u1=(int)u&0xfc; \
 209         u2&=0xfc; \
 210         t=ROTATE(t,4); \
 211         LL^= *(const DES_LONG *)(des_SP      +u1); \
 212         LL^= *(const DES_LONG *)(des_SP+0x200+u2); \
 213         s1=(int)(u>>16L); \
 214         s2=(int)(u>>24L); \
 215         s1&=0xfc; \
 216         s2&=0xfc; \
 217         LL^= *(const DES_LONG *)(des_SP+0x400+s1); \
 218         LL^= *(const DES_LONG *)(des_SP+0x600+s2); \
 219         u2=(int)t>>8L; \
 220         u1=(int)t&0xfc; \
 221         u2&=0xfc; \
 222         LL^= *(const DES_LONG *)(des_SP+0x100+u1); \
 223         LL^= *(const DES_LONG *)(des_SP+0x300+u2); \
 224         s1=(int)(t>>16L); \
 225         s2=(int)(t>>24L); \
 226         s1&=0xfc; \
 227         s2&=0xfc; \
 228         LL^= *(const DES_LONG *)(des_SP+0x500+s1); \
 229         LL^= *(const DES_LONG *)(des_SP+0x700+s2); }
 230 #endif
 231 #else
 232 #define D_ENCRYPT(LL,R,S) { \
 233         LOAD_DATA_tmp(R,S,u,t,E0,E1); \
 234         t=ROTATE(t,4); \
 235         LL^= \
 236         *(const DES_LONG *)(des_SP      +((u     )&0xfc))^ \
 237         *(const DES_LONG *)(des_SP+0x200+((u>> 8L)&0xfc))^ \
 238         *(const DES_LONG *)(des_SP+0x400+((u>>16L)&0xfc))^ \
 239         *(const DES_LONG *)(des_SP+0x600+((u>>24L)&0xfc))^ \
 240         *(const DES_LONG *)(des_SP+0x100+((t     )&0xfc))^ \
 241         *(const DES_LONG *)(des_SP+0x300+((t>> 8L)&0xfc))^ \
 242         *(const DES_LONG *)(des_SP+0x500+((t>>16L)&0xfc))^ \
 243         *(const DES_LONG *)(des_SP+0x700+((t>>24L)&0xfc)); }
 244 #endif
 245
 246 #else /* original version */
 247
 248 #if defined(DES_RISC1) || defined(DES_RISC2)
 249 #ifdef DES_RISC1
 250 #define D_ENCRYPT(LL,R,S) {\
 251         unsigned int u1,u2,u3; \
 252         LOAD_DATA(R,S,u,t,E0,E1,u1); \
 253         u>>=2L; \
 254         t=ROTATE(t,6); \
 255         u2=(int)u>>8L; \
 256         u1=(int)u&0x3f; \
 257         u2&=0x3f; \
 258         u>>=16L; \
 259         LL^=DES_SPtrans[0][u1]; \
 260         LL^=DES_SPtrans[2][u2]; \
 261         u3=(int)u>>8L; \
 262         u1=(int)u&0x3f; \
 263         u3&=0x3f; \
 264         LL^=DES_SPtrans[4][u1]; \
 265         LL^=DES_SPtrans[6][u3]; \
 266         u2=(int)t>>8L; \
 267         u1=(int)t&0x3f; \
 268         u2&=0x3f; \
 269         t>>=16L; \
 270         LL^=DES_SPtrans[1][u1]; \
 271         LL^=DES_SPtrans[3][u2]; \
 272         u3=(int)t>>8L; \
 273         u1=(int)t&0x3f; \
 274         u3&=0x3f; \
 275         LL^=DES_SPtrans[5][u1]; \
 276         LL^=DES_SPtrans[7][u3]; }
 277 #endif
 278 #ifdef DES_RISC2
 279 #define D_ENCRYPT(LL,R,S) {\
 280         unsigned int u1,u2,s1,s2; \
 281         LOAD_DATA(R,S,u,t,E0,E1,u1); \
 282         u>>=2L; \
 283         t=ROTATE(t,6); \
 284         u2=(int)u>>8L; \
 285         u1=(int)u&0x3f; \
 286         u2&=0x3f; \
 287         LL^=DES_SPtrans[0][u1]; \
 288         LL^=DES_SPtrans[2][u2]; \
 289         s1=(int)u>>16L; \
 290         s2=(int)u>>24L; \
 291         s1&=0x3f; \
 292         s2&=0x3f; \
 293         LL^=DES_SPtrans[4][s1]; \
 294         LL^=DES_SPtrans[6][s2]; \
 295         u2=(int)t>>8L; \
 296         u1=(int)t&0x3f; \
 297         u2&=0x3f; \
 298         LL^=DES_SPtrans[1][u1]; \
 299         LL^=DES_SPtrans[3][u2]; \
 300         s1=(int)t>>16; \
 301         s2=(int)t>>24L; \
 302         s1&=0x3f; \
 303         s2&=0x3f; \
 304         LL^=DES_SPtrans[5][s1]; \
 305         LL^=DES_SPtrans[7][s2]; }
 306 #endif
 307
 308 #else
 309
 310 #define D_ENCRYPT(LL,R,S) {\
 311         LOAD_DATA_tmp(R,S,u,t,E0,E1); \
 312         t=ROTATE(t,4); \
 313         LL^=\
 314                 DES_SPtrans[0][(u>> 2L)&0x3f]^ \
 315                 DES_SPtrans[2][(u>>10L)&0x3f]^ \
 316                 DES_SPtrans[4][(u>>18L)&0x3f]^ \
 317                 DES_SPtrans[6][(u>>26L)&0x3f]^ \
 318                 DES_SPtrans[1][(t>> 2L)&0x3f]^ \
 319                 DES_SPtrans[3][(t>>10L)&0x3f]^ \
 320                 DES_SPtrans[5][(t>>18L)&0x3f]^ \
 321                 DES_SPtrans[7][(t>>26L)&0x3f]; }
 322 #endif
 323 #endif
 324
 325         /* IP and FP
 326          * The problem is more of a geometric problem that random bit fiddling.
 327          0  1  2  3  4  5  6  7      62 54 46 38 30 22 14  6
 328          8  9 10 11 12 13 14 15      60 52 44 36 28 20 12  4
 329         16 17 18 19 20 21 22 23      58 50 42 34 26 18 10  2
 330         24 25 26 27 28 29 30 31  to  56 48 40 32 24 16  8  0
 331
 332         32 33 34 35 36 37 38 39      63 55 47 39 31 23 15  7
 333         40 41 42 43 44 45 46 47      61 53 45 37 29 21 13  5
 334         48 49 50 51 52 53 54 55      59 51 43 35 27 19 11  3
 335         56 57 58 59 60 61 62 63      57 49 41 33 25 17  9  1
 336
 337         The output has been subject to swaps of the form
 338         0 1 -> 3 1 but the odd and even bits have been put into
 339         2 3    2 0
 340         different words.  The main trick is to remember that
 341         t=((l>>size)^r)&(mask);
 342         r^=t;
 343         l^=(t<<size);
 344         can be used to swap and move bits between words.
 345
 346         So l =  0  1  2  3  r = 16 17 18 19
 347                 4  5  6  7      20 21 22 23
 348                 8  9 10 11      24 25 26 27
 349                12 13 14 15      28 29 30 31
 350         becomes (for size == 2 and mask == 0x3333)
 351            t =   2^16  3^17 -- --   l =  0  1 16 17  r =  2  3 18 19
 352                  6^20  7^21 -- --        4  5 20 21       6  7 22 23
 353                 10^24 11^25 -- --        8  9 24 25      10 11 24 25
 354                 14^28 15^29 -- --       12 13 28 29      14 15 28 29
 355
 356         Thanks for hints from Richard Outerbridge - he told me IP&FP
 357         could be done in 15 xor, 10 shifts and 5 ands.
 358         When I finally started to think of the problem in 2D
 359         I first got ~42 operations without xors.  When I remembered
 360         how to use xors :-) I got it to its final state.
 361         */
 362 #define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\
 363         (b)^=(t),\
 364         (a)^=((t)<<(n)))
 365
 366 #define IP(l,r) \
 367         { \
 368         DES_LONG tt; \
 369         PERM_OP(r,l,tt, 4,0x0f0f0f0fL); \
 370         PERM_OP(l,r,tt,16,0x0000ffffL); \
 371         PERM_OP(r,l,tt, 2,0x33333333L); \
 372         PERM_OP(l,r,tt, 8,0x00ff00ffL); \
 373         PERM_OP(r,l,tt, 1,0x55555555L); \
 374         }
 375
 376 #define FP(l,r) \
 377         { \
 378         DES_LONG tt; \
 379         PERM_OP(l,r,tt, 1,0x55555555L); \
 380         PERM_OP(r,l,tt, 8,0x00ff00ffL); \
 381         PERM_OP(l,r,tt, 2,0x33333333L); \
 382         PERM_OP(r,l,tt,16,0x0000ffffL); \
 383         PERM_OP(l,r,tt, 4,0x0f0f0f0fL); \
 384         }
 385
 386 extern const DES_LONG DES_SPtrans[8][64];
 387
 388 void fcrypt_body(DES_LONG *out,DES_key_schedule *ks,
 389                  DES_LONG Eswap0, DES_LONG Eswap1);
 390
 391 #ifdef OPENSSL_SMALL_FOOTPRINT
 392 #undef DES_UNROLL
 393 #endif
 394
 395 __END_HIDDEN_DECLS
 396
 397 #endif