crypto/cast/cast_lcl.h

   1 /*
   2  * Copyright 1995-2017 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (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 #ifdef OPENSSL_SYS_WIN32
  11 # include <stdlib.h>
  12 #endif
  13
  14 #undef c2l
  15 #define c2l(c,l)        (l =((unsigned long)(*((c)++)))    , \
  16                          l|=((unsigned long)(*((c)++)))<< 8L, \
  17                          l|=((unsigned long)(*((c)++)))<<16L, \
  18                          l|=((unsigned long)(*((c)++)))<<24L)
  19
  20 /* NOTE - c is not incremented as per c2l */
  21 #undef c2ln
  22 #define c2ln(c,l1,l2,n) { \
  23                         c+=n; \
  24                         l1=l2=0; \
  25                         switch (n) { \
  26                         case 8: l2 =((unsigned long)(*(--(c))))<<24L; \
  27                         case 7: l2|=((unsigned long)(*(--(c))))<<16L; \
  28                         case 6: l2|=((unsigned long)(*(--(c))))<< 8L; \
  29                         case 5: l2|=((unsigned long)(*(--(c))));     \
  30                         case 4: l1 =((unsigned long)(*(--(c))))<<24L; \
  31                         case 3: l1|=((unsigned long)(*(--(c))))<<16L; \
  32                         case 2: l1|=((unsigned long)(*(--(c))))<< 8L; \
  33                         case 1: l1|=((unsigned long)(*(--(c))));     \
  34                                 } \
  35                         }
  36
  37 #undef l2c
  38 #define l2c(l,c)        (*((c)++)=(unsigned char)(((l)     )&0xff), \
  39                          *((c)++)=(unsigned char)(((l)>> 8L)&0xff), \
  40                          *((c)++)=(unsigned char)(((l)>>16L)&0xff), \
  41                          *((c)++)=(unsigned char)(((l)>>24L)&0xff))
  42
  43 /* NOTE - c is not incremented as per l2c */
  44 #undef l2cn
  45 #define l2cn(l1,l2,c,n) { \
  46                         c+=n; \
  47                         switch (n) { \
  48                         case 8: *(--(c))=(unsigned char)(((l2)>>24L)&0xff); \
  49                         case 7: *(--(c))=(unsigned char)(((l2)>>16L)&0xff); \
  50                         case 6: *(--(c))=(unsigned char)(((l2)>> 8L)&0xff); \
  51                         case 5: *(--(c))=(unsigned char)(((l2)     )&0xff); \
  52                         case 4: *(--(c))=(unsigned char)(((l1)>>24L)&0xff); \
  53                         case 3: *(--(c))=(unsigned char)(((l1)>>16L)&0xff); \
  54                         case 2: *(--(c))=(unsigned char)(((l1)>> 8L)&0xff); \
  55                         case 1: *(--(c))=(unsigned char)(((l1)     )&0xff); \
  56                                 } \
  57                         }
  58
  59 /* NOTE - c is not incremented as per n2l */
  60 #define n2ln(c,l1,l2,n) { \
  61                         c+=n; \
  62                         l1=l2=0; \
  63                         switch (n) { \
  64                         case 8: l2 =((unsigned long)(*(--(c))))    ; \
  65                         /* fall thru */                              \
  66                         case 7: l2|=((unsigned long)(*(--(c))))<< 8; \
  67                         /* fall thru */                              \
  68                         case 6: l2|=((unsigned long)(*(--(c))))<<16; \
  69                         /* fall thru */                              \
  70                         case 5: l2|=((unsigned long)(*(--(c))))<<24; \
  71                         /* fall thru */                              \
  72                         case 4: l1 =((unsigned long)(*(--(c))))    ; \
  73                         /* fall thru */                              \
  74                         case 3: l1|=((unsigned long)(*(--(c))))<< 8; \
  75                         /* fall thru */                              \
  76                         case 2: l1|=((unsigned long)(*(--(c))))<<16; \
  77                         /* fall thru */                              \
  78                         case 1: l1|=((unsigned long)(*(--(c))))<<24; \
  79                                 } \
  80                         }
  81
  82 /* NOTE - c is not incremented as per l2n */
  83 #define l2nn(l1,l2,c,n) { \
  84                         c+=n; \
  85                         switch (n) { \
  86                         case 8: *(--(c))=(unsigned char)(((l2)    )&0xff); \
  87                         /* fall thru */                                    \
  88                         case 7: *(--(c))=(unsigned char)(((l2)>> 8)&0xff); \
  89                         /* fall thru */                                    \
  90                         case 6: *(--(c))=(unsigned char)(((l2)>>16)&0xff); \
  91                         /* fall thru */                                    \
  92                         case 5: *(--(c))=(unsigned char)(((l2)>>24)&0xff); \
  93                         /* fall thru */                                    \
  94                         case 4: *(--(c))=(unsigned char)(((l1)    )&0xff); \
  95                         /* fall thru */                                    \
  96                         case 3: *(--(c))=(unsigned char)(((l1)>> 8)&0xff); \
  97                         /* fall thru */                                    \
  98                         case 2: *(--(c))=(unsigned char)(((l1)>>16)&0xff); \
  99                         /* fall thru */                                    \
 100                         case 1: *(--(c))=(unsigned char)(((l1)>>24)&0xff); \
 101                                 } \
 102                         }
 103
 104 #undef n2l
 105 #define n2l(c,l)        (l =((unsigned long)(*((c)++)))<<24L, \
 106                          l|=((unsigned long)(*((c)++)))<<16L, \
 107                          l|=((unsigned long)(*((c)++)))<< 8L, \
 108                          l|=((unsigned long)(*((c)++))))
 109
 110 #undef l2n
 111 #define l2n(l,c)        (*((c)++)=(unsigned char)(((l)>>24L)&0xff), \
 112                          *((c)++)=(unsigned char)(((l)>>16L)&0xff), \
 113                          *((c)++)=(unsigned char)(((l)>> 8L)&0xff), \
 114                          *((c)++)=(unsigned char)(((l)     )&0xff))
 115
 116 #if defined(OPENSSL_SYS_WIN32) && defined(_MSC_VER)
 117 # define ROTL(a,n)     (_lrotl(a,n))
 118 #else
 119 # define ROTL(a,n)     ((((a)<<(n))&0xffffffffL)|((a)>>((32-(n))&31)))
 120 #endif
 121
 122 #define C_M    0x3fc
 123 #define C_0    22L
 124 #define C_1    14L
 125 #define C_2     6L
 126 #define C_3     2L              /* left shift */
 127
 128 /* The rotate has an extra 16 added to it to help the x86 asm */
 129 #if defined(CAST_PTR)
 130 # define E_CAST(n,key,L,R,OP1,OP2,OP3) \
 131         { \
 132         int i; \
 133         t=(key[n*2] OP1 R)&0xffffffffL; \
 134         i=key[n*2+1]; \
 135         t=ROTL(t,i); \
 136         L^= (((((*(CAST_LONG *)((unsigned char *) \
 137                         CAST_S_table0+((t>>C_2)&C_M)) OP2 \
 138                 *(CAST_LONG *)((unsigned char *) \
 139                         CAST_S_table1+((t<<C_3)&C_M)))&0xffffffffL) OP3 \
 140                 *(CAST_LONG *)((unsigned char *) \
 141                         CAST_S_table2+((t>>C_0)&C_M)))&0xffffffffL) OP1 \
 142                 *(CAST_LONG *)((unsigned char *) \
 143                         CAST_S_table3+((t>>C_1)&C_M)))&0xffffffffL; \
 144         }
 145 #elif defined(CAST_PTR2)
 146 # define E_CAST(n,key,L,R,OP1,OP2,OP3) \
 147         { \
 148         int i; \
 149         CAST_LONG u,v,w; \
 150         w=(key[n*2] OP1 R)&0xffffffffL; \
 151         i=key[n*2+1]; \
 152         w=ROTL(w,i); \
 153         u=w>>C_2; \
 154         v=w<<C_3; \
 155         u&=C_M; \
 156         v&=C_M; \
 157         t= *(CAST_LONG *)((unsigned char *)CAST_S_table0+u); \
 158         u=w>>C_0; \
 159         t=(t OP2 *(CAST_LONG *)((unsigned char *)CAST_S_table1+v))&0xffffffffL;\
 160         v=w>>C_1; \
 161         u&=C_M; \
 162         v&=C_M; \
 163         t=(t OP3 *(CAST_LONG *)((unsigned char *)CAST_S_table2+u)&0xffffffffL);\
 164         t=(t OP1 *(CAST_LONG *)((unsigned char *)CAST_S_table3+v)&0xffffffffL);\
 165         L^=(t&0xffffffff); \
 166         }
 167 #else
 168 # define E_CAST(n,key,L,R,OP1,OP2,OP3) \
 169         { \
 170         CAST_LONG a,b,c,d; \
 171         t=(key[n*2] OP1 R)&0xffffffff; \
 172         t=ROTL(t,(key[n*2+1])); \
 173         a=CAST_S_table0[(t>> 8)&0xff]; \
 174         b=CAST_S_table1[(t    )&0xff]; \
 175         c=CAST_S_table2[(t>>24)&0xff]; \
 176         d=CAST_S_table3[(t>>16)&0xff]; \
 177         L^=(((((a OP2 b)&0xffffffffL) OP3 c)&0xffffffffL) OP1 d)&0xffffffffL; \
 178         }
 179 #endif
 180
 181 extern const CAST_LONG CAST_S_table0[256];
 182 extern const CAST_LONG CAST_S_table1[256];
 183 extern const CAST_LONG CAST_S_table2[256];
 184 extern const CAST_LONG CAST_S_table3[256];
 185 extern const CAST_LONG CAST_S_table4[256];
 186 extern const CAST_LONG CAST_S_table5[256];
 187 extern const CAST_LONG CAST_S_table6[256];
 188 extern const CAST_LONG CAST_S_table7[256];