ecmult_compute_table_impl.h (2235B)
1 /***************************************************************************************************** 2 * Copyright (c) 2013, 2014, 2017, 2021 Pieter Wuille, Andrew Poelstra, Jonas Nick, Russell O'Connor * 3 * Distributed under the MIT software license, see the accompanying * 4 * file COPYING or https://www.opensource.org/licenses/mit-license.php. * 5 *****************************************************************************************************/ 6 7 #ifndef SECP256K1_ECMULT_COMPUTE_TABLE_IMPL_H 8 #define SECP256K1_ECMULT_COMPUTE_TABLE_IMPL_H 9 10 #include "ecmult_compute_table.h" 11 #include "group_impl.h" 12 #include "field_impl.h" 13 #include "ecmult.h" 14 #include "util.h" 15 16 static void haskellsecp256k1_v0_1_0_ecmult_compute_table(haskellsecp256k1_v0_1_0_ge_storage* table, int window_g, const haskellsecp256k1_v0_1_0_gej* gen) { 17 haskellsecp256k1_v0_1_0_gej gj; 18 haskellsecp256k1_v0_1_0_ge ge, dgen; 19 int j; 20 21 gj = *gen; 22 haskellsecp256k1_v0_1_0_ge_set_gej_var(&ge, &gj); 23 haskellsecp256k1_v0_1_0_ge_to_storage(&table[0], &ge); 24 25 haskellsecp256k1_v0_1_0_gej_double_var(&gj, gen, NULL); 26 haskellsecp256k1_v0_1_0_ge_set_gej_var(&dgen, &gj); 27 28 for (j = 1; j < ECMULT_TABLE_SIZE(window_g); ++j) { 29 haskellsecp256k1_v0_1_0_gej_set_ge(&gj, &ge); 30 haskellsecp256k1_v0_1_0_gej_add_ge_var(&gj, &gj, &dgen, NULL); 31 haskellsecp256k1_v0_1_0_ge_set_gej_var(&ge, &gj); 32 haskellsecp256k1_v0_1_0_ge_to_storage(&table[j], &ge); 33 } 34 } 35 36 /* Like haskellsecp256k1_v0_1_0_ecmult_compute_table, but one for both gen and gen*2^128. */ 37 static void haskellsecp256k1_v0_1_0_ecmult_compute_two_tables(haskellsecp256k1_v0_1_0_ge_storage* table, haskellsecp256k1_v0_1_0_ge_storage* table_128, int window_g, const haskellsecp256k1_v0_1_0_ge* gen) { 38 haskellsecp256k1_v0_1_0_gej gj; 39 int i; 40 41 haskellsecp256k1_v0_1_0_gej_set_ge(&gj, gen); 42 haskellsecp256k1_v0_1_0_ecmult_compute_table(table, window_g, &gj); 43 for (i = 0; i < 128; ++i) { 44 haskellsecp256k1_v0_1_0_gej_double_var(&gj, &gj, NULL); 45 } 46 haskellsecp256k1_v0_1_0_ecmult_compute_table(table_128, window_g, &gj); 47 } 48 49 #endif /* SECP256K1_ECMULT_COMPUTE_TABLE_IMPL_H */