gost_grasshopper_math.h

   1 /*
   2  * Maxim Tishkov 2016
   3  * This file is distributed under the same license as OpenSSL
   4  */
   5
   6 #ifndef GOST_GRASSHOPPER_MATH_H
   7 #define GOST_GRASSHOPPER_MATH_H
   8
   9 #if defined(__cplusplus)
  10 extern "C" {
  11 #endif
  12
  13 #include "gost_grasshopper_defines.h"
  14
  15 #if defined(__SSE__) || defined(__SSE2__) || defined(__SSE2_MATH__) || defined(__SSE3__) || defined(__SSE_MATH__) \
  16  || defined(__SSE4_1__)|| defined(__SSE4_2__)|| defined(__SSSE3__)
  17 #define GRASSHOPPER_SSE_SUPPORTED
  18 #endif
  19
  20 #define GRASSHOPPER_MIN_BITS 8
  21 #define GRASSHOPPER_MAX_BITS 128
  22
  23 #if UINTPTR_MAX == 0xff
  24 #define GRASSHOPPER_BITS 8
  25 #elif UINTPTR_MAX == 0xffff
  26 #define GRASSHOPPER_BITS 16
  27 #elif UINTPTR_MAX == 0xffffffff
  28 #define GRASSHOPPER_BITS 32
  29 #elif UINTPTR_MAX == 0xffffffffffffffff
  30 #define GRASSHOPPER_BITS 64
  31 #endif
  32
  33 #define GRASSHOPPER_BIT_PARTS_8 (GRASSHOPPER_MAX_BITS / 8)
  34 #define GRASSHOPPER_BIT_PARTS_16 (GRASSHOPPER_MAX_BITS / 16)
  35 #define GRASSHOPPER_BIT_PARTS_32 (GRASSHOPPER_MAX_BITS / 32)
  36 #define GRASSHOPPER_BIT_PARTS_64 (GRASSHOPPER_MAX_BITS / 64)
  37
  38 #define GRASSHOPPER_BIT_PARTS (GRASSHOPPER_MAX_BITS / GRASSHOPPER_BITS)
  39 #define GRASSHOPPER_MAX_BIT_PARTS (GRASSHOPPER_MAX_BITS / GRASSHOPPER_MIN_BITS)
  40
  41 #define GRASSHOPPER_ACCESS_128_VALUE_8(key, part) ((key).b[(part)])
  42 #define GRASSHOPPER_ACCESS_128_VALUE_16(key, part) ((key).w[(part)])
  43 #define GRASSHOPPER_ACCESS_128_VALUE_32(key, part) ((key).d[(part)])
  44 #define GRASSHOPPER_ACCESS_128_VALUE_64(key, part) ((key).q[(part)])
  45
  46 #if(GRASSHOPPER_BITS == 8)
  47 #define GRASSHOPPER_ACCESS_128_VALUE GRASSHOPPER_ACCESS_128_VALUE_8
  48 #elif(GRASSHOPPER_BITS == 16)
  49 #define GRASSHOPPER_ACCESS_128_VALUE GRASSHOPPER_ACCESS_128_VALUE_16
  50 #elif(GRASSHOPPER_BITS == 32)
  51 #define GRASSHOPPER_ACCESS_128_VALUE GRASSHOPPER_ACCESS_128_VALUE_32
  52 #elif(GRASSHOPPER_BITS == 64)
  53 #define GRASSHOPPER_ACCESS_128_VALUE GRASSHOPPER_ACCESS_128_VALUE_64
  54 #endif
  55
  56 static GRASSHOPPER_INLINE void grasshopper_zero128(grasshopper_w128_t* x) {
  57 #if(GRASSHOPPER_BITS == 8 || GRASSHOPPER_BITS == 16)
  58     memset(&x, 0, sizeof(x));
  59 #else
  60                 int i;
  61     for (i = 0; i < GRASSHOPPER_BIT_PARTS; i++) {
  62         GRASSHOPPER_ACCESS_128_VALUE(*x, i) = 0;
  63     }
  64 #endif
  65 }
  66
  67 static GRASSHOPPER_INLINE void grasshopper_copy128(grasshopper_w128_t* to, const grasshopper_w128_t* from) {
  68 #if(GRASSHOPPER_BITS == 8 || GRASSHOPPER_BITS == 16)
  69     __builtin_memcpy(&to, &from, sizeof(w128_t));
  70 #else
  71                 int i;
  72     for (i = 0; i < GRASSHOPPER_BIT_PARTS; i++) {
  73         GRASSHOPPER_ACCESS_128_VALUE(*to, i) = GRASSHOPPER_ACCESS_128_VALUE(*from, i);
  74     }
  75 #endif
  76 }
  77
  78 static GRASSHOPPER_INLINE void grasshopper_append128(grasshopper_w128_t* x, const grasshopper_w128_t* y) {
  79                 int i;
  80     for (i = 0; i < GRASSHOPPER_BIT_PARTS; i++) {
  81         GRASSHOPPER_ACCESS_128_VALUE(*x, i) ^= GRASSHOPPER_ACCESS_128_VALUE(*y, i);
  82     }
  83 }
  84
  85 static GRASSHOPPER_INLINE void grasshopper_plus128(grasshopper_w128_t* result, const grasshopper_w128_t* x,
  86                                                const grasshopper_w128_t* y) {
  87     grasshopper_copy128(result, x);
  88     grasshopper_append128(result, y);
  89 }
  90
  91 // result & x must be different
  92 static GRASSHOPPER_INLINE void grasshopper_plus128multi(grasshopper_w128_t* result, const grasshopper_w128_t* x,
  93                                                     const grasshopper_w128_t array[][256]) {
  94                 int i;
  95     grasshopper_zero128(result);
  96     for (i = 0; i < GRASSHOPPER_MAX_BIT_PARTS; i++) {
  97         grasshopper_append128(result, &array[i][GRASSHOPPER_ACCESS_128_VALUE_8(*x, i)]);
  98     }
  99 }
 100
 101 static GRASSHOPPER_INLINE void grasshopper_append128multi(grasshopper_w128_t* result, grasshopper_w128_t* x,
 102                                                       const grasshopper_w128_t array[][256]) {
 103     grasshopper_plus128multi(result, x, array);
 104     grasshopper_copy128(x, result);
 105 }
 106
 107 static GRASSHOPPER_INLINE void grasshopper_convert128(grasshopper_w128_t* x, const uint8_t* array) {
 108                 int i;
 109     for (i = 0; i < GRASSHOPPER_MAX_BIT_PARTS; i++) {
 110         GRASSHOPPER_ACCESS_128_VALUE_8(*x, i) = array[GRASSHOPPER_ACCESS_128_VALUE_8(*x, i)];
 111     }
 112 }
 113
 114 #define GRASSHOPPER_GALOIS_POWER 8
 115
 116 #define GRASSHOPPER_GALOIS_FIELD_SIZE ((1 << GRASSHOPPER_GALOIS_POWER) - 1)
 117
 118 extern uint8_t grasshopper_galois_alpha_to[256];
 119 extern uint8_t grasshopper_galois_index_of[256];
 120
 121 static GRASSHOPPER_INLINE uint8_t grasshopper_galois_mul(uint8_t x, uint8_t y) {
 122     if (likely(x != 0 && y != 0)) {
 123         return grasshopper_galois_alpha_to[(grasshopper_galois_index_of[x] + grasshopper_galois_index_of[y]) %
 124                                          GRASSHOPPER_GALOIS_FIELD_SIZE];
 125     } else {
 126         return 0;
 127     }
 128 }
 129
 130 #if defined(__cplusplus)
 131 }
 132 #endif
 133
 134 #endif