crypto/idea/idea_lcl.h

   1 /*
   2  * Copyright 1995-2016 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 #define idea_mul(r,a,b,ul) \
  11 ul=(unsigned long)a*b; \
  12 if (ul != 0) \
  13         { \
  14         r=(ul&0xffff)-(ul>>16); \
  15         r-=((r)>>16); \
  16         } \
  17 else \
  18         r=(-(int)a-b+1);        /* assuming a or b is 0 and in range */
  19
  20 /* NOTE - c is not incremented as per n2l */
  21 #define n2ln(c,l1,l2,n) { \
  22                         c+=n; \
  23                         l1=l2=0; \
  24                         switch (n) { \
  25                         case 8: l2 =((unsigned long)(*(--(c))))    ; \
  26                         /* fall thru */                              \
  27                         case 7: l2|=((unsigned long)(*(--(c))))<< 8; \
  28                         /* fall thru */                              \
  29                         case 6: l2|=((unsigned long)(*(--(c))))<<16; \
  30                         /* fall thru */                              \
  31                         case 5: l2|=((unsigned long)(*(--(c))))<<24; \
  32                         /* fall thru */                              \
  33                         case 4: l1 =((unsigned long)(*(--(c))))    ; \
  34                         /* fall thru */                              \
  35                         case 3: l1|=((unsigned long)(*(--(c))))<< 8; \
  36                         /* fall thru */                              \
  37                         case 2: l1|=((unsigned long)(*(--(c))))<<16; \
  38                         /* fall thru */                              \
  39                         case 1: l1|=((unsigned long)(*(--(c))))<<24; \
  40                                 } \
  41                         }
  42
  43 /* NOTE - c is not incremented as per l2n */
  44 #define l2nn(l1,l2,c,n) { \
  45                         c+=n; \
  46                         switch (n) { \
  47                         case 8: *(--(c))=(unsigned char)(((l2)    )&0xff); \
  48                         /* fall thru */                                    \
  49                         case 7: *(--(c))=(unsigned char)(((l2)>> 8)&0xff); \
  50                         /* fall thru */                                    \
  51                         case 6: *(--(c))=(unsigned char)(((l2)>>16)&0xff); \
  52                         /* fall thru */                                    \
  53                         case 5: *(--(c))=(unsigned char)(((l2)>>24)&0xff); \
  54                         /* fall thru */                                    \
  55                         case 4: *(--(c))=(unsigned char)(((l1)    )&0xff); \
  56                         /* fall thru */                                    \
  57                         case 3: *(--(c))=(unsigned char)(((l1)>> 8)&0xff); \
  58                         /* fall thru */                                    \
  59                         case 2: *(--(c))=(unsigned char)(((l1)>>16)&0xff); \
  60                         /* fall thru */                                    \
  61                         case 1: *(--(c))=(unsigned char)(((l1)>>24)&0xff); \
  62                                 } \
  63                         }
  64
  65 #undef n2l
  66 #define n2l(c,l)        (l =((unsigned long)(*((c)++)))<<24L, \
  67                          l|=((unsigned long)(*((c)++)))<<16L, \
  68                          l|=((unsigned long)(*((c)++)))<< 8L, \
  69                          l|=((unsigned long)(*((c)++))))
  70
  71 #undef l2n
  72 #define l2n(l,c)        (*((c)++)=(unsigned char)(((l)>>24L)&0xff), \
  73                          *((c)++)=(unsigned char)(((l)>>16L)&0xff), \
  74                          *((c)++)=(unsigned char)(((l)>> 8L)&0xff), \
  75                          *((c)++)=(unsigned char)(((l)     )&0xff))
  76
  77 #undef s2n
  78 #define s2n(l,c)        (*((c)++)=(unsigned char)(((l)     )&0xff), \
  79                          *((c)++)=(unsigned char)(((l)>> 8L)&0xff))
  80
  81 #undef n2s
  82 #define n2s(c,l)        (l =((IDEA_INT)(*((c)++)))<< 8L, \
  83                          l|=((IDEA_INT)(*((c)++)))      )
  84
  85
  86 #define E_IDEA(num) \
  87         x1&=0xffff; \
  88         idea_mul(x1,x1,*p,ul); p++; \
  89         x2+= *(p++); \
  90         x3+= *(p++); \
  91         x4&=0xffff; \
  92         idea_mul(x4,x4,*p,ul); p++; \
  93         t0=(x1^x3)&0xffff; \
  94         idea_mul(t0,t0,*p,ul); p++; \
  95         t1=(t0+(x2^x4))&0xffff; \
  96         idea_mul(t1,t1,*p,ul); p++; \
  97         t0+=t1; \
  98         x1^=t1; \
  99         x4^=t0; \
 100         ul=x2^t0; /* do the swap to x3 */ \
 101         x2=x3^t1; \
 102         x3=ul;