48 lines
1.7 KiB
C
48 lines
1.7 KiB
C
|
/**********************************************************************
|
||
|
|
* Copyright (c) 2013, 2014 Pieter Wuille *
|
||
|
|
* Distributed under the MIT software license, see the accompanying *
|
||
|
|
* file COPYING or http://www.opensource.org/licenses/mit-license.php.*
|
||
|
|
**********************************************************************/
|
||
|
|
|
||
|
|
#ifndef SECP256K1_FIELD_REPR_H
|
||
|
|
#define SECP256K1_FIELD_REPR_H
|
||
|
|
|
||
|
|
#include <stdint.h>
|
||
|
|
|
||
|
|
typedef struct {
|
||
|
|
/* X = sum(i=0..4, elem[i]*2^52) mod n */
|
||
|
|
uint64_t n[5];
|
||
|
|
#ifdef VERIFY
|
||
|
|
int magnitude;
|
||
|
|
int normalized;
|
||
|
|
#endif
|
||
|
|
} secp256k1_fe;
|
||
|
|
|
||
|
|
/* Unpacks a constant into a overlapping multi-limbed FE element. */
|
||
|
|
#define SECP256K1_FE_CONST_INNER(d7, d6, d5, d4, d3, d2, d1, d0) { \
|
||
|
|
(d0) | (((uint64_t)(d1) & 0xFFFFFUL) << 32), \
|
||
|
|
((uint64_t)(d1) >> 20) | (((uint64_t)(d2)) << 12) | (((uint64_t)(d3) & 0xFFUL) << 44), \
|
||
|
|
((uint64_t)(d3) >> 8) | (((uint64_t)(d4) & 0xFFFFFFFUL) << 24), \
|
||
|
|
((uint64_t)(d4) >> 28) | (((uint64_t)(d5)) << 4) | (((uint64_t)(d6) & 0xFFFFUL) << 36), \
|
||
|
|
((uint64_t)(d6) >> 16) | (((uint64_t)(d7)) << 16) \
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifdef VERIFY
|
||
|
|
#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}
|
||
|
|
#else
|
||
|
|
#define SECP256K1_FE_CONST(d7, d6, d5, d4, d3, d2, d1, d0) {SECP256K1_FE_CONST_INNER((d7), (d6), (d5), (d4), (d3), (d2), (d1), (d0))}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
typedef struct {
|
||
|
|
uint64_t n[4];
|
||
|
|
} secp256k1_fe_storage;
|
||
|
|
|
||
|
|
#define SECP256K1_FE_STORAGE_CONST(d7, d6, d5, d4, d3, d2, d1, d0) {{ \
|
||
|
|
(d0) | (((uint64_t)(d1)) << 32), \
|
||
|
|
(d2) | (((uint64_t)(d3)) << 32), \
|
||
|
|
(d4) | (((uint64_t)(d5)) << 32), \
|
||
|
|
(d6) | (((uint64_t)(d7)) << 32) \
|
||
|
|
}}
|
||
|
|
|
||
|
|
#endif /* SECP256K1_FIELD_REPR_H */
|