crypto/bf/bf_locl.h

   1 /* crypto/bf/bf_locl.h */
   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_BF_LOCL_H
  60 # define HEADER_BF_LOCL_H
  61 # include <openssl/opensslconf.h>
  62 # include "internal/bf_conf.h"
  63
  64 # undef c2l
  65 # define c2l(c,l)        (l =((unsigned long)(*((c)++)))    , \
  66                          l|=((unsigned long)(*((c)++)))<< 8L, \
  67                          l|=((unsigned long)(*((c)++)))<<16L, \
  68                          l|=((unsigned long)(*((c)++)))<<24L)
  69
  70 /* NOTE - c is not incremented as per c2l */
  71 # undef c2ln
  72 # define c2ln(c,l1,l2,n) { \
  73                         c+=n; \
  74                         l1=l2=0; \
  75                         switch (n) { \
  76                         case 8: l2 =((unsigned long)(*(--(c))))<<24L; \
  77                         case 7: l2|=((unsigned long)(*(--(c))))<<16L; \
  78                         case 6: l2|=((unsigned long)(*(--(c))))<< 8L; \
  79                         case 5: l2|=((unsigned long)(*(--(c))));     \
  80                         case 4: l1 =((unsigned long)(*(--(c))))<<24L; \
  81                         case 3: l1|=((unsigned long)(*(--(c))))<<16L; \
  82                         case 2: l1|=((unsigned long)(*(--(c))))<< 8L; \
  83                         case 1: l1|=((unsigned long)(*(--(c))));     \
  84                                 } \
  85                         }
  86
  87 # undef l2c
  88 # define l2c(l,c)        (*((c)++)=(unsigned char)(((l)     )&0xff), \
  89                          *((c)++)=(unsigned char)(((l)>> 8L)&0xff), \
  90                          *((c)++)=(unsigned char)(((l)>>16L)&0xff), \
  91                          *((c)++)=(unsigned char)(((l)>>24L)&0xff))
  92
  93 /* NOTE - c is not incremented as per l2c */
  94 # undef l2cn
  95 # define l2cn(l1,l2,c,n) { \
  96                         c+=n; \
  97                         switch (n) { \
  98                         case 8: *(--(c))=(unsigned char)(((l2)>>24L)&0xff); \
  99                         case 7: *(--(c))=(unsigned char)(((l2)>>16L)&0xff); \
 100                         case 6: *(--(c))=(unsigned char)(((l2)>> 8L)&0xff); \
 101                         case 5: *(--(c))=(unsigned char)(((l2)     )&0xff); \
 102                         case 4: *(--(c))=(unsigned char)(((l1)>>24L)&0xff); \
 103                         case 3: *(--(c))=(unsigned char)(((l1)>>16L)&0xff); \
 104                         case 2: *(--(c))=(unsigned char)(((l1)>> 8L)&0xff); \
 105                         case 1: *(--(c))=(unsigned char)(((l1)     )&0xff); \
 106                                 } \
 107                         }
 108
 109 /* NOTE - c is not incremented as per n2l */
 110 # define n2ln(c,l1,l2,n) { \
 111                         c+=n; \
 112                         l1=l2=0; \
 113                         switch (n) { \
 114                         case 8: l2 =((unsigned long)(*(--(c))))    ; \
 115                         case 7: l2|=((unsigned long)(*(--(c))))<< 8; \
 116                         case 6: l2|=((unsigned long)(*(--(c))))<<16; \
 117                         case 5: l2|=((unsigned long)(*(--(c))))<<24; \
 118                         case 4: l1 =((unsigned long)(*(--(c))))    ; \
 119                         case 3: l1|=((unsigned long)(*(--(c))))<< 8; \
 120                         case 2: l1|=((unsigned long)(*(--(c))))<<16; \
 121                         case 1: l1|=((unsigned long)(*(--(c))))<<24; \
 122                                 } \
 123                         }
 124
 125 /* NOTE - c is not incremented as per l2n */
 126 # define l2nn(l1,l2,c,n) { \
 127                         c+=n; \
 128                         switch (n) { \
 129                         case 8: *(--(c))=(unsigned char)(((l2)    )&0xff); \
 130                         case 7: *(--(c))=(unsigned char)(((l2)>> 8)&0xff); \
 131                         case 6: *(--(c))=(unsigned char)(((l2)>>16)&0xff); \
 132                         case 5: *(--(c))=(unsigned char)(((l2)>>24)&0xff); \
 133                         case 4: *(--(c))=(unsigned char)(((l1)    )&0xff); \
 134                         case 3: *(--(c))=(unsigned char)(((l1)>> 8)&0xff); \
 135                         case 2: *(--(c))=(unsigned char)(((l1)>>16)&0xff); \
 136                         case 1: *(--(c))=(unsigned char)(((l1)>>24)&0xff); \
 137                                 } \
 138                         }
 139
 140 # undef n2l
 141 # define n2l(c,l)        (l =((unsigned long)(*((c)++)))<<24L, \
 142                          l|=((unsigned long)(*((c)++)))<<16L, \
 143                          l|=((unsigned long)(*((c)++)))<< 8L, \
 144                          l|=((unsigned long)(*((c)++))))
 145
 146 # undef l2n
 147 # define l2n(l,c)        (*((c)++)=(unsigned char)(((l)>>24L)&0xff), \
 148                          *((c)++)=(unsigned char)(((l)>>16L)&0xff), \
 149                          *((c)++)=(unsigned char)(((l)>> 8L)&0xff), \
 150                          *((c)++)=(unsigned char)(((l)     )&0xff))
 151
 152 /*
 153  * This is actually a big endian algorithm, the most significant byte is used
 154  * to lookup array 0
 155  */
 156
 157 # if defined(BF_PTR2)
 158
 159 /*
 160  * This is basically a special Intel version. Point is that Intel
 161  * doesn't have many registers, but offers a reach choice of addressing
 162  * modes. So we spare some registers by directly traversing BF_KEY
 163  * structure and hiring the most decorated addressing mode. The code
 164  * generated by EGCS is *perfectly* competitive with assembler
 165  * implementation!
 166  */
 167 #  define BF_ENC(LL,R,KEY,Pi) (\
 168         LL^=KEY[Pi], \
 169         t=  KEY[BF_ROUNDS+2 +   0 + ((R>>24)&0xFF)], \
 170         t+= KEY[BF_ROUNDS+2 + 256 + ((R>>16)&0xFF)], \
 171         t^= KEY[BF_ROUNDS+2 + 512 + ((R>>8 )&0xFF)], \
 172         t+= KEY[BF_ROUNDS+2 + 768 + ((R    )&0xFF)], \
 173         LL^=t \
 174         )
 175
 176 # elif defined(BF_PTR)
 177
 178 #  ifndef BF_LONG_LOG2
 179 #   define BF_LONG_LOG2  2      /* default to BF_LONG being 32 bits */
 180 #  endif
 181 #  define BF_M  (0xFF<<BF_LONG_LOG2)
 182 #  define BF_0  (24-BF_LONG_LOG2)
 183 #  define BF_1  (16-BF_LONG_LOG2)
 184 #  define BF_2  ( 8-BF_LONG_LOG2)
 185 #  define BF_3  BF_LONG_LOG2    /* left shift */
 186
 187 /*
 188  * This is normally very good on RISC platforms where normally you
 189  * have to explicitly "multiply" array index by sizeof(BF_LONG)
 190  * in order to calculate the effective address. This implementation
 191  * excuses CPU from this extra work. Power[PC] uses should have most
 192  * fun as (R>>BF_i)&BF_M gets folded into a single instruction, namely
 193  * rlwinm. So let'em double-check if their compiler does it.
 194  */
 195
 196 #  define BF_ENC(LL,R,S,P) ( \
 197         LL^=P, \
 198         LL^= (((*(BF_LONG *)((unsigned char *)&(S[  0])+((R>>BF_0)&BF_M))+ \
 199                 *(BF_LONG *)((unsigned char *)&(S[256])+((R>>BF_1)&BF_M)))^ \
 200                 *(BF_LONG *)((unsigned char *)&(S[512])+((R>>BF_2)&BF_M)))+ \
 201                 *(BF_LONG *)((unsigned char *)&(S[768])+((R<<BF_3)&BF_M))) \
 202         )
 203 # else
 204
 205 /*
 206  * This is a *generic* version. Seem to perform best on platforms that
 207  * offer explicit support for extraction of 8-bit nibbles preferably
 208  * complemented with "multiplying" of array index by sizeof(BF_LONG).
 209  * For the moment of this writing the list comprises Alpha CPU featuring
 210  * extbl and s[48]addq instructions.
 211  */
 212
 213 #  define BF_ENC(LL,R,S,P) ( \
 214         LL^=P, \
 215         LL^=((( S[       ((int)(R>>24)&0xff)] + \
 216                 S[0x0100+((int)(R>>16)&0xff)])^ \
 217                 S[0x0200+((int)(R>> 8)&0xff)])+ \
 218                 S[0x0300+((int)(R    )&0xff)])&0xffffffffL \
 219         )
 220 # endif
 221
 222 #endif