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47 lines
1.6 KiB
47 lines
1.6 KiB
/**********************************************************************
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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_
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#define _SECP256K1_FIELD_REPR_
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#include <stdint.h>
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typedef struct {
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/* X = sum(i=0..4, elem[i]*2^52) mod n */
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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_t;
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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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((d1) >> 20) | ((uint64_t)(d2)) << 12 | ((uint64_t)(d3) & 0xFFUL) << 44, \
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((d3) >> 8) | ((uint64_t)(d4) & 0xFFFFFFFUL) << 24, \
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((d4) >> 28) | ((uint64_t)(d5)) << 4 | ((uint64_t)(d6) & 0xFFFFUL) << 36, \
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((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_t;
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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
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