github.com/SmartMeshFoundation/Spectrum@v0.0.0-20220621030607-452a266fee1e/crypto/secp256k1/libsecp256k1/src/field_10x26.h (about)

     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_
     8  #define _SECP256K1_FIELD_REPR_
     9  
    10  #include <stdint.h>
    11  
    12  typedef struct {
    13      /* X = sum(i=0..9, elem[i]*2^26) mod n */
    14      uint32_t n[10];
    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) & 0x3FFFFFFUL, \
    24      (((uint32_t)d0) >> 26) | (((uint32_t)(d1) & 0xFFFFFUL) << 6), \
    25      (((uint32_t)d1) >> 20) | (((uint32_t)(d2) & 0x3FFFUL) << 12), \
    26      (((uint32_t)d2) >> 14) | (((uint32_t)(d3) & 0xFFUL) << 18), \
    27      (((uint32_t)d3) >> 8) | (((uint32_t)(d4) & 0x3UL) << 24), \
    28      (((uint32_t)d4) >> 2) & 0x3FFFFFFUL, \
    29      (((uint32_t)d4) >> 28) | (((uint32_t)(d5) & 0x3FFFFFUL) << 4), \
    30      (((uint32_t)d5) >> 22) | (((uint32_t)(d6) & 0xFFFFUL) << 10), \
    31      (((uint32_t)d6) >> 16) | (((uint32_t)(d7) & 0x3FFUL) << 16), \
    32      (((uint32_t)d7) >> 10) \
    33  }
    34  
    35  #ifdef VERIFY
    36  #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}
    37  #else
    38  #define SECP256K1_FE_CONST(d7, d6, d5, d4, d3, d2, d1, d0) {SECP256K1_FE_CONST_INNER((d7), (d6), (d5), (d4), (d3), (d2), (d1), (d0))}
    39  #endif
    40  
    41  typedef struct {
    42      uint32_t n[8];
    43  } secp256k1_fe_storage;
    44  
    45  #define SECP256K1_FE_STORAGE_CONST(d7, d6, d5, d4, d3, d2, d1, d0) {{ (d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7) }}
    46  #define SECP256K1_FE_STORAGE_CONST_GET(d) d.n[7], d.n[6], d.n[5], d.n[4],d.n[3], d.n[2], d.n[1], d.n[0]
    47  #endif