mirror of https://github.com/jb55/nostril.git
50 lines
1.9 KiB
C
50 lines
1.9 KiB
C
/*****************************************************************************************************
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* Copyright (c) 2013, 2014, 2017, 2021 Pieter Wuille, Andrew Poelstra, Jonas Nick, Russell O'Connor *
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* Distributed under the MIT software license, see the accompanying *
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* file COPYING or https://www.opensource.org/licenses/mit-license.php. *
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*****************************************************************************************************/
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#ifndef SECP256K1_ECMULT_COMPUTE_TABLE_IMPL_H
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#define SECP256K1_ECMULT_COMPUTE_TABLE_IMPL_H
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#include "ecmult_compute_table.h"
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#include "group_impl.h"
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#include "field_impl.h"
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#include "ecmult.h"
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#include "util.h"
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static void secp256k1_ecmult_compute_table(secp256k1_ge_storage* table, int window_g, const secp256k1_gej* gen) {
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secp256k1_gej gj;
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secp256k1_ge ge, dgen;
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int j;
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gj = *gen;
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secp256k1_ge_set_gej_var(&ge, &gj);
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secp256k1_ge_to_storage(&table[0], &ge);
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secp256k1_gej_double_var(&gj, gen, NULL);
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secp256k1_ge_set_gej_var(&dgen, &gj);
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for (j = 1; j < ECMULT_TABLE_SIZE(window_g); ++j) {
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secp256k1_gej_set_ge(&gj, &ge);
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secp256k1_gej_add_ge_var(&gj, &gj, &dgen, NULL);
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secp256k1_ge_set_gej_var(&ge, &gj);
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secp256k1_ge_to_storage(&table[j], &ge);
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}
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}
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/* Like secp256k1_ecmult_compute_table, but one for both gen and gen*2^128. */
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static void secp256k1_ecmult_compute_two_tables(secp256k1_ge_storage* table, secp256k1_ge_storage* table_128, int window_g, const secp256k1_ge* gen) {
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secp256k1_gej gj;
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int i;
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secp256k1_gej_set_ge(&gj, gen);
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secp256k1_ecmult_compute_table(table, window_g, &gj);
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for (i = 0; i < 128; ++i) {
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secp256k1_gej_double_var(&gj, &gj, NULL);
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}
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secp256k1_ecmult_compute_table(table_128, window_g, &gj);
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}
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#endif /* SECP256K1_ECMULT_COMPUTE_TABLE_IMPL_H */
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