crypto/cast/cast_local.h

   1 /*
   2  * Copyright 1995-2023 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 /* 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                         /* fall through */                              \
  21                         case 7: l2|=((unsigned long)(*(--(c))))<< 8; \
  22                         /* fall through */                              \
  23                         case 6: l2|=((unsigned long)(*(--(c))))<<16; \
  24                         /* fall through */                              \
  25                         case 5: l2|=((unsigned long)(*(--(c))))<<24; \
  26                         /* fall through */                              \
  27                         case 4: l1 =((unsigned long)(*(--(c))))    ; \
  28                         /* fall through */                              \
  29                         case 3: l1|=((unsigned long)(*(--(c))))<< 8; \
  30                         /* fall through */                              \
  31                         case 2: l1|=((unsigned long)(*(--(c))))<<16; \
  32                         /* fall through */                              \
  33                         case 1: l1|=((unsigned long)(*(--(c))))<<24; \
  34                                 } \
  35                         }
  36
  37 /* NOTE - c is not incremented as per l2n */
  38 #define l2nn(l1,l2,c,n) { \
  39                         c+=n; \
  40                         switch (n) { \
  41                         case 8: *(--(c))=(unsigned char)(((l2)    )&0xff); \
  42                         /* fall through */                                    \
  43                         case 7: *(--(c))=(unsigned char)(((l2)>> 8)&0xff); \
  44                         /* fall through */                                    \
  45                         case 6: *(--(c))=(unsigned char)(((l2)>>16)&0xff); \
  46                         /* fall through */                                    \
  47                         case 5: *(--(c))=(unsigned char)(((l2)>>24)&0xff); \
  48                         /* fall through */                                    \
  49                         case 4: *(--(c))=(unsigned char)(((l1)    )&0xff); \
  50                         /* fall through */                                    \
  51                         case 3: *(--(c))=(unsigned char)(((l1)>> 8)&0xff); \
  52                         /* fall through */                                    \
  53                         case 2: *(--(c))=(unsigned char)(((l1)>>16)&0xff); \
  54                         /* fall through */                                    \
  55                         case 1: *(--(c))=(unsigned char)(((l1)>>24)&0xff); \
  56                                 } \
  57                         }
  58
  59 #undef n2l
  60 #define n2l(c,l)        (l =((unsigned long)(*((c)++)))<<24L, \
  61                          l|=((unsigned long)(*((c)++)))<<16L, \
  62                          l|=((unsigned long)(*((c)++)))<< 8L, \
  63                          l|=((unsigned long)(*((c)++))))
  64
  65 #undef l2n
  66 #define l2n(l,c)        (*((c)++)=(unsigned char)(((l)>>24L)&0xff), \
  67                          *((c)++)=(unsigned char)(((l)>>16L)&0xff), \
  68                          *((c)++)=(unsigned char)(((l)>> 8L)&0xff), \
  69                          *((c)++)=(unsigned char)(((l)     )&0xff))
  70
  71 #if defined(OPENSSL_SYS_WIN32) && defined(_MSC_VER)
  72 # define ROTL(a,n)     (_lrotl(a,n))
  73 #else
  74 # define ROTL(a,n)     ((((a)<<(n))&0xffffffffL)|((a)>>((32-(n))&31)))
  75 #endif
  76
  77 #define C_M    0x3fc
  78 #define C_0    22L
  79 #define C_1    14L
  80 #define C_2     6L
  81 #define C_3     2L              /* left shift */
  82
  83 /* The rotate has an extra 16 added to it to help the x86 asm */
  84 #if defined(CAST_PTR)
  85 # define E_CAST(n,key,L,R,OP1,OP2,OP3) \
  86         { \
  87         int i; \
  88         t=(key[n*2] OP1 R)&0xffffffffL; \
  89         i=key[n*2+1]; \
  90         t=ROTL(t,i); \
  91         L^= (((((*(CAST_LONG *)((unsigned char *) \
  92                         CAST_S_table0+((t>>C_2)&C_M)) OP2 \
  93                 *(CAST_LONG *)((unsigned char *) \
  94                         CAST_S_table1+((t<<C_3)&C_M)))&0xffffffffL) OP3 \
  95                 *(CAST_LONG *)((unsigned char *) \
  96                         CAST_S_table2+((t>>C_0)&C_M)))&0xffffffffL) OP1 \
  97                 *(CAST_LONG *)((unsigned char *) \
  98                         CAST_S_table3+((t>>C_1)&C_M)))&0xffffffffL; \
  99         }
 100 #elif defined(CAST_PTR2)
 101 # define E_CAST(n,key,L,R,OP1,OP2,OP3) \
 102         { \
 103         int i; \
 104         CAST_LONG u,v,w; \
 105         w=(key[n*2] OP1 R)&0xffffffffL; \
 106         i=key[n*2+1]; \
 107         w=ROTL(w,i); \
 108         u=w>>C_2; \
 109         v=w<<C_3; \
 110         u&=C_M; \
 111         v&=C_M; \
 112         t= *(CAST_LONG *)((unsigned char *)CAST_S_table0+u); \
 113         u=w>>C_0; \
 114         t=(t OP2 *(CAST_LONG *)((unsigned char *)CAST_S_table1+v))&0xffffffffL;\
 115         v=w>>C_1; \
 116         u&=C_M; \
 117         v&=C_M; \
 118         t=(t OP3 *(CAST_LONG *)((unsigned char *)CAST_S_table2+u)&0xffffffffL);\
 119         t=(t OP1 *(CAST_LONG *)((unsigned char *)CAST_S_table3+v)&0xffffffffL);\
 120         L^=(t&0xffffffff); \
 121         }
 122 #else
 123 # define E_CAST(n,key,L,R,OP1,OP2,OP3) \
 124         { \
 125         CAST_LONG a,b,c,d; \
 126         t=(key[n*2] OP1 R)&0xffffffff; \
 127         t=ROTL(t,(key[n*2+1])); \
 128         a=CAST_S_table0[(t>> 8)&0xff]; \
 129         b=CAST_S_table1[(t    )&0xff]; \
 130         c=CAST_S_table2[(t>>24)&0xff]; \
 131         d=CAST_S_table3[(t>>16)&0xff]; \
 132         L^=(((((a OP2 b)&0xffffffffL) OP3 c)&0xffffffffL) OP1 d)&0xffffffffL; \
 133         }
 134 #endif
 135
 136 extern const CAST_LONG CAST_S_table0[256];
 137 extern const CAST_LONG CAST_S_table1[256];
 138 extern const CAST_LONG CAST_S_table2[256];
 139 extern const CAST_LONG CAST_S_table3[256];
 140 extern const CAST_LONG CAST_S_table4[256];
 141 extern const CAST_LONG CAST_S_table5[256];
 142 extern const CAST_LONG CAST_S_table6[256];
 143 extern const CAST_LONG CAST_S_table7[256];