crypto/des/des_locl.h

   1 /*
   2  * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #ifndef HEADER_DES_LOCL_H
  11 # define HEADER_DES_LOCL_H
  12
  13 # include <openssl/e_os2.h>
  14
  15 # include <stdio.h>
  16 # include <stdlib.h>
  17 # include <string.h>
  18
  19 # include <openssl/des.h>
  20
  21 # ifdef OPENSSL_BUILD_SHLIBCRYPTO
  22 #  undef OPENSSL_EXTERN
  23 #  define OPENSSL_EXTERN OPENSSL_EXPORT
  24 # endif
  25
  26 # define ITERATIONS 16
  27 # define HALF_ITERATIONS 8
  28
  29 /* used in des_read and des_write */
  30 # define MAXWRITE        (1024*16)
  31 # define BSIZE           (MAXWRITE+4)
  32
  33 # define c2l(c,l)        (l =((DES_LONG)(*((c)++)))    , \
  34                          l|=((DES_LONG)(*((c)++)))<< 8L, \
  35                          l|=((DES_LONG)(*((c)++)))<<16L, \
  36                          l|=((DES_LONG)(*((c)++)))<<24L)
  37
  38 /* NOTE - c is not incremented as per c2l */
  39 # define c2ln(c,l1,l2,n) { \
  40                         c+=n; \
  41                         l1=l2=0; \
  42                         switch (n) { \
  43                         case 8: l2 =((DES_LONG)(*(--(c))))<<24L; \
  44                         case 7: l2|=((DES_LONG)(*(--(c))))<<16L; \
  45                         case 6: l2|=((DES_LONG)(*(--(c))))<< 8L; \
  46                         case 5: l2|=((DES_LONG)(*(--(c))));     \
  47                         case 4: l1 =((DES_LONG)(*(--(c))))<<24L; \
  48                         case 3: l1|=((DES_LONG)(*(--(c))))<<16L; \
  49                         case 2: l1|=((DES_LONG)(*(--(c))))<< 8L; \
  50                         case 1: l1|=((DES_LONG)(*(--(c))));     \
  51                                 } \
  52                         }
  53
  54 # define l2c(l,c)        (*((c)++)=(unsigned char)(((l)     )&0xff), \
  55                          *((c)++)=(unsigned char)(((l)>> 8L)&0xff), \
  56                          *((c)++)=(unsigned char)(((l)>>16L)&0xff), \
  57                          *((c)++)=(unsigned char)(((l)>>24L)&0xff))
  58
  59 /*
  60  * replacements for htonl and ntohl since I have no idea what to do when
  61  * faced with machines with 8 byte longs.
  62  */
  63 # define HDRSIZE 4
  64
  65 # define n2l(c,l)        (l =((DES_LONG)(*((c)++)))<<24L, \
  66                          l|=((DES_LONG)(*((c)++)))<<16L, \
  67                          l|=((DES_LONG)(*((c)++)))<< 8L, \
  68                          l|=((DES_LONG)(*((c)++))))
  69
  70 # define l2n(l,c)        (*((c)++)=(unsigned char)(((l)>>24L)&0xff), \
  71                          *((c)++)=(unsigned char)(((l)>>16L)&0xff), \
  72                          *((c)++)=(unsigned char)(((l)>> 8L)&0xff), \
  73                          *((c)++)=(unsigned char)(((l)     )&0xff))
  74
  75 /* NOTE - c is not incremented as per l2c */
  76 # define l2cn(l1,l2,c,n) { \
  77                         c+=n; \
  78                         switch (n) { \
  79                         case 8: *(--(c))=(unsigned char)(((l2)>>24L)&0xff); \
  80                         case 7: *(--(c))=(unsigned char)(((l2)>>16L)&0xff); \
  81                         case 6: *(--(c))=(unsigned char)(((l2)>> 8L)&0xff); \
  82                         case 5: *(--(c))=(unsigned char)(((l2)     )&0xff); \
  83                         case 4: *(--(c))=(unsigned char)(((l1)>>24L)&0xff); \
  84                         case 3: *(--(c))=(unsigned char)(((l1)>>16L)&0xff); \
  85                         case 2: *(--(c))=(unsigned char)(((l1)>> 8L)&0xff); \
  86                         case 1: *(--(c))=(unsigned char)(((l1)     )&0xff); \
  87                                 } \
  88                         }
  89
  90 # if (defined(OPENSSL_SYS_WIN32) && defined(_MSC_VER))
  91 #  define ROTATE(a,n)     (_lrotr(a,n))
  92 # elif defined(__ICC)
  93 #  define ROTATE(a,n)     (_rotr(a,n))
  94 # elif defined(__GNUC__) && __GNUC__>=2 && !defined(__STRICT_ANSI__) && !defined(OPENSSL_NO_ASM) && !defined(OPENSSL_NO_INLINE_ASM) && !defined(PEDANTIC)
  95 #  if defined(__i386) || defined(__i386__) || defined(__x86_64) || defined(__x86_64__)
  96 #   define ROTATE(a,n)   ({ register unsigned int ret;   \
  97                                 asm ("rorl %1,%0"       \
  98                                         : "=r"(ret)     \
  99                                         : "I"(n),"0"(a) \
 100                                         : "cc");        \
 101                            ret;                         \
 102                         })
 103 #  endif
 104 # endif
 105 # ifndef ROTATE
 106 #  define ROTATE(a,n)     (((a)>>(n))+((a)<<(32-(n))))
 107 # endif
 108
 109 /*
 110  * Don't worry about the LOAD_DATA() stuff, that is used by fcrypt() to add
 111  * it's little bit to the front
 112  */
 113
 114 # ifdef DES_FCRYPT
 115
 116 #  define LOAD_DATA_tmp(R,S,u,t,E0,E1) \
 117         { DES_LONG tmp; LOAD_DATA(R,S,u,t,E0,E1,tmp); }
 118
 119 #  define LOAD_DATA(R,S,u,t,E0,E1,tmp) \
 120         t=R^(R>>16L); \
 121         u=t&E0; t&=E1; \
 122         tmp=(u<<16); u^=R^s[S  ]; u^=tmp; \
 123         tmp=(t<<16); t^=R^s[S+1]; t^=tmp
 124 # else
 125 #  define LOAD_DATA_tmp(a,b,c,d,e,f) LOAD_DATA(a,b,c,d,e,f,g)
 126 #  define LOAD_DATA(R,S,u,t,E0,E1,tmp) \
 127         u=R^s[S  ]; \
 128         t=R^s[S+1]
 129 # endif
 130
 131 /*
 132  * It recently occurred to me that 0^0^0^0^0^0^0 == 0, so there is no reason
 133  * to not xor all the sub items together.  This potentially saves a register
 134  * since things can be xored directly into L
 135  */
 136
 137 # define D_ENCRYPT(LL,R,S) { \
 138         LOAD_DATA_tmp(R,S,u,t,E0,E1); \
 139         t=ROTATE(t,4); \
 140         LL^= \
 141             DES_SPtrans[0][(u>> 2L)&0x3f]^ \
 142             DES_SPtrans[2][(u>>10L)&0x3f]^ \
 143             DES_SPtrans[4][(u>>18L)&0x3f]^ \
 144             DES_SPtrans[6][(u>>26L)&0x3f]^ \
 145             DES_SPtrans[1][(t>> 2L)&0x3f]^ \
 146             DES_SPtrans[3][(t>>10L)&0x3f]^ \
 147             DES_SPtrans[5][(t>>18L)&0x3f]^ \
 148             DES_SPtrans[7][(t>>26L)&0x3f]; }
 149
 150         /*-
 151          * IP and FP
 152          * The problem is more of a geometric problem that random bit fiddling.
 153          0  1  2  3  4  5  6  7      62 54 46 38 30 22 14  6
 154          8  9 10 11 12 13 14 15      60 52 44 36 28 20 12  4
 155         16 17 18 19 20 21 22 23      58 50 42 34 26 18 10  2
 156         24 25 26 27 28 29 30 31  to  56 48 40 32 24 16  8  0
 157
 158         32 33 34 35 36 37 38 39      63 55 47 39 31 23 15  7
 159         40 41 42 43 44 45 46 47      61 53 45 37 29 21 13  5
 160         48 49 50 51 52 53 54 55      59 51 43 35 27 19 11  3
 161         56 57 58 59 60 61 62 63      57 49 41 33 25 17  9  1
 162
 163         The output has been subject to swaps of the form
 164         0 1 -> 3 1 but the odd and even bits have been put into
 165         2 3    2 0
 166         different words.  The main trick is to remember that
 167         t=((l>>size)^r)&(mask);
 168         r^=t;
 169         l^=(t<<size);
 170         can be used to swap and move bits between words.
 171
 172         So l =  0  1  2  3  r = 16 17 18 19
 173                 4  5  6  7      20 21 22 23
 174                 8  9 10 11      24 25 26 27
 175                12 13 14 15      28 29 30 31
 176         becomes (for size == 2 and mask == 0x3333)
 177            t =   2^16  3^17 -- --   l =  0  1 16 17  r =  2  3 18 19
 178                  6^20  7^21 -- --        4  5 20 21       6  7 22 23
 179                 10^24 11^25 -- --        8  9 24 25      10 11 24 25
 180                 14^28 15^29 -- --       12 13 28 29      14 15 28 29
 181
 182         Thanks for hints from Richard Outerbridge - he told me IP&FP
 183         could be done in 15 xor, 10 shifts and 5 ands.
 184         When I finally started to think of the problem in 2D
 185         I first got ~42 operations without xors.  When I remembered
 186         how to use xors :-) I got it to its final state.
 187         */
 188 # define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\
 189         (b)^=(t),\
 190         (a)^=((t)<<(n)))
 191
 192 # define IP(l,r) \
 193         { \
 194         register DES_LONG tt; \
 195         PERM_OP(r,l,tt, 4,0x0f0f0f0fL); \
 196         PERM_OP(l,r,tt,16,0x0000ffffL); \
 197         PERM_OP(r,l,tt, 2,0x33333333L); \
 198         PERM_OP(l,r,tt, 8,0x00ff00ffL); \
 199         PERM_OP(r,l,tt, 1,0x55555555L); \
 200         }
 201
 202 # define FP(l,r) \
 203         { \
 204         register DES_LONG tt; \
 205         PERM_OP(l,r,tt, 1,0x55555555L); \
 206         PERM_OP(r,l,tt, 8,0x00ff00ffL); \
 207         PERM_OP(l,r,tt, 2,0x33333333L); \
 208         PERM_OP(r,l,tt,16,0x0000ffffL); \
 209         PERM_OP(l,r,tt, 4,0x0f0f0f0fL); \
 210         }
 211
 212 extern const DES_LONG DES_SPtrans[8][64];
 213
 214 void fcrypt_body(DES_LONG *out, DES_key_schedule *ks,
 215                  DES_LONG Eswap0, DES_LONG Eswap1);
 216
 217 #endif