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     for (int i = 0; i < GRASSHOPPER_BIT_PARTS; i++) {
  61         GRASSHOPPER_ACCESS_128_VALUE(*x, i) = 0;
  62     }
  63 #endif
  64 }
  65
  66 static GRASSHOPPER_INLINE void grasshopper_copy128(grasshopper_w128_t* to, const grasshopper_w128_t* from) {
  67 #if(GRASSHOPPER_BITS == 8 || GRASSHOPPER_BITS == 16)
  68     __builtin_memcpy(&to, &from, sizeof(w128_t));
  69 #else
  70     for (int i = 0; i < GRASSHOPPER_BIT_PARTS; i++) {
  71         GRASSHOPPER_ACCESS_128_VALUE(*to, i) = GRASSHOPPER_ACCESS_128_VALUE(*from, i);
  72     }
  73 #endif
  74 }
  75
  76 static GRASSHOPPER_INLINE void grasshopper_append128(grasshopper_w128_t* x, const grasshopper_w128_t* y) {
  77     for (int i = 0; i < GRASSHOPPER_BIT_PARTS; i++) {
  78         GRASSHOPPER_ACCESS_128_VALUE(*x, i) ^= GRASSHOPPER_ACCESS_128_VALUE(*y, i);
  79     }
  80 }
  81
  82 static GRASSHOPPER_INLINE void grasshopper_plus128(grasshopper_w128_t* result, const grasshopper_w128_t* x,
  83                                                const grasshopper_w128_t* y) {
  84     grasshopper_copy128(result, x);
  85     grasshopper_append128(result, y);
  86 }
  87
  88 // result & x must be different
  89 static GRASSHOPPER_INLINE void grasshopper_plus128multi(grasshopper_w128_t* result, const grasshopper_w128_t* x,
  90                                                     const grasshopper_w128_t array[][256]) {
  91     grasshopper_zero128(result);
  92     for (int i = 0; i < GRASSHOPPER_MAX_BIT_PARTS; i++) {
  93         grasshopper_append128(result, &array[i][GRASSHOPPER_ACCESS_128_VALUE_8(*x, i)]);
  94     }
  95 }
  96
  97 static GRASSHOPPER_INLINE void grasshopper_append128multi(grasshopper_w128_t* result, grasshopper_w128_t* x,
  98                                                       const grasshopper_w128_t array[][256]) {
  99     grasshopper_plus128multi(result, x, array);
 100     grasshopper_copy128(x, result);
 101 }
 102
 103 static GRASSHOPPER_INLINE void grasshopper_convert128(grasshopper_w128_t* x, const uint8_t* array) {
 104     for (int i = 0; i < GRASSHOPPER_MAX_BIT_PARTS; i++) {
 105         GRASSHOPPER_ACCESS_128_VALUE_8(*x, i) = array[GRASSHOPPER_ACCESS_128_VALUE_8(*x, i)];
 106     }
 107 }
 108
 109 #define GRASSHOPPER_GALOIS_POWER 8
 110
 111 #define GRASSHOPPER_GALOIS_FIELD_SIZE ((1 << GRASSHOPPER_GALOIS_POWER) - 1)
 112
 113 extern uint8_t grasshopper_galois_alpha_to[256];
 114 extern uint8_t grasshopper_galois_index_of[256];
 115
 116 static GRASSHOPPER_INLINE uint8_t grasshopper_galois_mul(uint8_t x, uint8_t y) {
 117     if (__builtin_expect(x != 0 && y != 0, 1)) {
 118         return grasshopper_galois_alpha_to[(grasshopper_galois_index_of[x] + grasshopper_galois_index_of[y]) %
 119                                          GRASSHOPPER_GALOIS_FIELD_SIZE];
 120     } else {
 121         return 0;
 122     }
 123 }
 124
 125 #if defined(__cplusplus)
 126 }
 127 #endif
 128
 129 #endif