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50 lines
1.7 KiB
C
50 lines
1.7 KiB
C
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/**********************************************************************
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* Copyright (c) 2013, 2014 Pieter Wuille *
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* Distributed under the MIT software license, see the accompanying *
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* file COPYING or http://www.opensource.org/licenses/mit-license.php.*
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**********************************************************************/
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#ifndef SECP256K1_FIELD_REPR_H
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#define SECP256K1_FIELD_REPR_H
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#include <stdint.h>
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typedef struct {
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/* X = sum(i=0..4, n[i]*2^(i*52)) mod p
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* where p = 2^256 - 0x1000003D1
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*/
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uint64_t n[5];
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#ifdef VERIFY
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int magnitude;
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int normalized;
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#endif
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} secp256k1_fe;
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/* Unpacks a constant into a overlapping multi-limbed FE element. */
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#define SECP256K1_FE_CONST_INNER(d7, d6, d5, d4, d3, d2, d1, d0) { \
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(d0) | (((uint64_t)(d1) & 0xFFFFFUL) << 32), \
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((uint64_t)(d1) >> 20) | (((uint64_t)(d2)) << 12) | (((uint64_t)(d3) & 0xFFUL) << 44), \
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((uint64_t)(d3) >> 8) | (((uint64_t)(d4) & 0xFFFFFFFUL) << 24), \
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((uint64_t)(d4) >> 28) | (((uint64_t)(d5)) << 4) | (((uint64_t)(d6) & 0xFFFFUL) << 36), \
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((uint64_t)(d6) >> 16) | (((uint64_t)(d7)) << 16) \
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}
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#ifdef VERIFY
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#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}
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#else
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#define SECP256K1_FE_CONST(d7, d6, d5, d4, d3, d2, d1, d0) {SECP256K1_FE_CONST_INNER((d7), (d6), (d5), (d4), (d3), (d2), (d1), (d0))}
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#endif
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typedef struct {
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uint64_t n[4];
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} secp256k1_fe_storage;
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#define SECP256K1_FE_STORAGE_CONST(d7, d6, d5, d4, d3, d2, d1, d0) {{ \
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(d0) | (((uint64_t)(d1)) << 32), \
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(d2) | (((uint64_t)(d3)) << 32), \
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(d4) | (((uint64_t)(d5)) << 32), \
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(d6) | (((uint64_t)(d7)) << 32) \
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}}
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#endif /* SECP256K1_FIELD_REPR_H */
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