src/field_5x52.h

   1 /**********************************************************************
   2  * Copyright (c) 2013, 2014 Pieter Wuille                             *
   3  * Distributed under the MIT software license, see the accompanying   *
   4  * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
   5  **********************************************************************/
   6
   7 #ifndef SECP256K1_FIELD_REPR_H
   8 #define SECP256K1_FIELD_REPR_H
   9
  10 #include <stdint.h>
  11
  12 typedef struct {
  13     /* X = sum(i=0..4, elem[i]*2^52) mod n */
  14     uint64_t n[5];
  15 #ifdef VERIFY
  16     int magnitude;
  17     int normalized;
  18 #endif
  19 } secp256k1_fe;
  20
  21 /* Unpacks a constant into a overlapping multi-limbed FE element. */
  22 #define SECP256K1_FE_CONST_INNER(d7, d6, d5, d4, d3, d2, d1, d0) { \
  23     (d0) | (((uint64_t)(d1) & 0xFFFFFUL) << 32), \
  24     ((uint64_t)(d1) >> 20) | (((uint64_t)(d2)) << 12) | (((uint64_t)(d3) & 0xFFUL) << 44), \
  25     ((uint64_t)(d3) >> 8) | (((uint64_t)(d4) & 0xFFFFFFFUL) << 24), \
  26     ((uint64_t)(d4) >> 28) | (((uint64_t)(d5)) << 4) | (((uint64_t)(d6) & 0xFFFFUL) << 36), \
  27     ((uint64_t)(d6) >> 16) | (((uint64_t)(d7)) << 16) \
  28 }
  29
  30 #ifdef VERIFY
  31 #define SECP256K1_FE_CONST(d7, d6, d5, d4, d3, d2, d1, d0) {SECP256K1_FE_CONST_INNER((d7), (d6), (d5), (d4), (d3), (d2), (d1), (d0)), 1, 1}
  32 #else
  33 #define SECP256K1_FE_CONST(d7, d6, d5, d4, d3, d2, d1, d0) {SECP256K1_FE_CONST_INNER((d7), (d6), (d5), (d4), (d3), (d2), (d1), (d0))}
  34 #endif
  35
  36 typedef struct {
  37     uint64_t n[4];
  38 } secp256k1_fe_storage;
  39
  40 #define SECP256K1_FE_STORAGE_CONST(d7, d6, d5, d4, d3, d2, d1, d0) {{ \
  41     (d0) | (((uint64_t)(d1)) << 32), \
  42     (d2) | (((uint64_t)(d3)) << 32), \
  43     (d4) | (((uint64_t)(d5)) << 32), \
  44     (d6) | (((uint64_t)(d7)) << 32) \
  45 }}
  46
  47 #endif /* SECP256K1_FIELD_REPR_H */