crypto/bf/bf_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_BF_LOCL_H
  11 # define HEADER_BF_LOCL_H
  12 # include <openssl/opensslconf.h>
  13
  14 /* NOTE - c is not incremented as per n2l */
  15 # define n2ln(c,l1,l2,n) { \
  16                         c+=n; \
  17                         l1=l2=0; \
  18                         switch (n) { \
  19                         case 8: l2 =((unsigned long)(*(--(c))))    ; \
  20                         case 7: l2|=((unsigned long)(*(--(c))))<< 8; \
  21                         case 6: l2|=((unsigned long)(*(--(c))))<<16; \
  22                         case 5: l2|=((unsigned long)(*(--(c))))<<24; \
  23                         case 4: l1 =((unsigned long)(*(--(c))))    ; \
  24                         case 3: l1|=((unsigned long)(*(--(c))))<< 8; \
  25                         case 2: l1|=((unsigned long)(*(--(c))))<<16; \
  26                         case 1: l1|=((unsigned long)(*(--(c))))<<24; \
  27                                 } \
  28                         }
  29
  30 /* NOTE - c is not incremented as per l2n */
  31 # define l2nn(l1,l2,c,n) { \
  32                         c+=n; \
  33                         switch (n) { \
  34                         case 8: *(--(c))=(unsigned char)(((l2)    )&0xff); \
  35                         case 7: *(--(c))=(unsigned char)(((l2)>> 8)&0xff); \
  36                         case 6: *(--(c))=(unsigned char)(((l2)>>16)&0xff); \
  37                         case 5: *(--(c))=(unsigned char)(((l2)>>24)&0xff); \
  38                         case 4: *(--(c))=(unsigned char)(((l1)    )&0xff); \
  39                         case 3: *(--(c))=(unsigned char)(((l1)>> 8)&0xff); \
  40                         case 2: *(--(c))=(unsigned char)(((l1)>>16)&0xff); \
  41                         case 1: *(--(c))=(unsigned char)(((l1)>>24)&0xff); \
  42                                 } \
  43                         }
  44
  45 # undef n2l
  46 # define n2l(c,l)        (l =((unsigned long)(*((c)++)))<<24L, \
  47                          l|=((unsigned long)(*((c)++)))<<16L, \
  48                          l|=((unsigned long)(*((c)++)))<< 8L, \
  49                          l|=((unsigned long)(*((c)++))))
  50
  51 # undef l2n
  52 # define l2n(l,c)        (*((c)++)=(unsigned char)(((l)>>24L)&0xff), \
  53                          *((c)++)=(unsigned char)(((l)>>16L)&0xff), \
  54                          *((c)++)=(unsigned char)(((l)>> 8L)&0xff), \
  55                          *((c)++)=(unsigned char)(((l)     )&0xff))
  56
  57 /*
  58  * This is actually a big endian algorithm, the most significant byte is used
  59  * to lookup array 0
  60  */
  61
  62 # define BF_ENC(LL,R,S,P) ( \
  63         LL^=P, \
  64         LL^=((( S[       ((R>>24)&0xff)] + \
  65                 S[0x0100+((R>>16)&0xff)])^ \
  66                 S[0x0200+((R>> 8)&0xff)])+ \
  67                 S[0x0300+((R    )&0xff)])&0xffffffffU \
  68         )
  69
  70 #endif