diff options
Diffstat (limited to 'src/secp256k1/src/gen_ecmult_static_pre_g.c')
| -rw-r--r-- | src/secp256k1/src/gen_ecmult_static_pre_g.c | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/src/secp256k1/src/gen_ecmult_static_pre_g.c b/src/secp256k1/src/gen_ecmult_static_pre_g.c new file mode 100644 index 0000000000..ba1d1f17d7 --- /dev/null +++ b/src/secp256k1/src/gen_ecmult_static_pre_g.c @@ -0,0 +1,131 @@ +/***************************************************************************************************** + * Copyright (c) 2013, 2014, 2017, 2021 Pieter Wuille, Andrew Poelstra, Jonas Nick, Russell O'Connor * + * Distributed under the MIT software license, see the accompanying * + * file COPYING or https://www.opensource.org/licenses/mit-license.php. * + *****************************************************************************************************/ + +#include <inttypes.h> +#include <stdio.h> + +/* Autotools creates libsecp256k1-config.h, of which ECMULT_WINDOW_SIZE is needed. + ifndef guard so downstream users can define their own if they do not use autotools. */ +#if !defined(ECMULT_WINDOW_SIZE) +#include "libsecp256k1-config.h" +#endif + +#include "../include/secp256k1.h" +#include "assumptions.h" +#include "util.h" +#include "field_impl.h" +#include "group_impl.h" +#include "ecmult.h" + +void print_table(FILE *fp, const char *name, int window_g, const secp256k1_gej *gen, int with_conditionals) { + static secp256k1_gej gj; + static secp256k1_ge ge, dgen; + static secp256k1_ge_storage ges; + int j; + int i; + + gj = *gen; + secp256k1_ge_set_gej_var(&ge, &gj); + secp256k1_ge_to_storage(&ges, &ge); + + fprintf(fp, "static const secp256k1_ge_storage %s[ECMULT_TABLE_SIZE(WINDOW_G)] = {\n", name); + fprintf(fp, " S(%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32 + ",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32")\n", + SECP256K1_GE_STORAGE_CONST_GET(ges)); + + secp256k1_gej_double_var(&gj, gen, NULL); + secp256k1_ge_set_gej_var(&dgen, &gj); + + j = 1; + for(i = 3; i <= window_g; ++i) { + if (with_conditionals) { + fprintf(fp, "#if ECMULT_TABLE_SIZE(WINDOW_G) > %ld\n", ECMULT_TABLE_SIZE(i-1)); + } + for(;j < ECMULT_TABLE_SIZE(i); ++j) { + secp256k1_gej_set_ge(&gj, &ge); + secp256k1_gej_add_ge_var(&gj, &gj, &dgen, NULL); + secp256k1_ge_set_gej_var(&ge, &gj); + secp256k1_ge_to_storage(&ges, &ge); + + fprintf(fp, ",S(%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32 + ",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32")\n", + SECP256K1_GE_STORAGE_CONST_GET(ges)); + } + if (with_conditionals) { + fprintf(fp, "#endif\n"); + } + } + fprintf(fp, "};\n"); +} + +void print_two_tables(FILE *fp, int window_g, const secp256k1_ge *g, int with_conditionals) { + secp256k1_gej gj; + int i; + + secp256k1_gej_set_ge(&gj, g); + print_table(fp, "secp256k1_pre_g", window_g, &gj, with_conditionals); + for (i = 0; i < 128; ++i) { + secp256k1_gej_double_var(&gj, &gj, NULL); + } + print_table(fp, "secp256k1_pre_g_128", window_g, &gj, with_conditionals); +} + +int main(void) { + const secp256k1_ge g = SECP256K1_G; + const secp256k1_ge g_13 = SECP256K1_G_ORDER_13; + const secp256k1_ge g_199 = SECP256K1_G_ORDER_199; + const int window_g_13 = 4; + const int window_g_199 = 8; + FILE* fp; + + fp = fopen("src/ecmult_static_pre_g.h","w"); + if (fp == NULL) { + fprintf(stderr, "Could not open src/ecmult_static_pre_g.h for writing!\n"); + return -1; + } + + fprintf(fp, "/* This file was automatically generated by gen_ecmult_static_pre_g. */\n"); + fprintf(fp, "/* This file contains an array secp256k1_pre_g with odd multiples of the base point G and\n"); + fprintf(fp, " * an array secp256k1_pre_g_128 with odd multiples of 2^128*G for accelerating the computation of a*P + b*G.\n"); + fprintf(fp, " */\n"); + fprintf(fp, "#ifndef SECP256K1_ECMULT_STATIC_PRE_G_H\n"); + fprintf(fp, "#define SECP256K1_ECMULT_STATIC_PRE_G_H\n"); + fprintf(fp, "#include \"group.h\"\n"); + fprintf(fp, "#ifdef S\n"); + fprintf(fp, " #error macro identifier S already in use.\n"); + fprintf(fp, "#endif\n"); + fprintf(fp, "#define S(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p) " + "SECP256K1_GE_STORAGE_CONST(0x##a##u,0x##b##u,0x##c##u,0x##d##u,0x##e##u,0x##f##u,0x##g##u," + "0x##h##u,0x##i##u,0x##j##u,0x##k##u,0x##l##u,0x##m##u,0x##n##u,0x##o##u,0x##p##u)\n"); + fprintf(fp, "#if ECMULT_TABLE_SIZE(ECMULT_WINDOW_SIZE) > %ld\n", ECMULT_TABLE_SIZE(ECMULT_WINDOW_SIZE)); + fprintf(fp, " #error configuration mismatch, invalid ECMULT_WINDOW_SIZE. Try deleting ecmult_static_pre_g.h before the build.\n"); + fprintf(fp, "#endif\n"); + fprintf(fp, "#if defined(EXHAUSTIVE_TEST_ORDER)\n"); + fprintf(fp, "#if EXHAUSTIVE_TEST_ORDER == 13\n"); + fprintf(fp, "#define WINDOW_G %d\n", window_g_13); + + print_two_tables(fp, window_g_13, &g_13, 0); + + fprintf(fp, "#elif EXHAUSTIVE_TEST_ORDER == 199\n"); + fprintf(fp, "#define WINDOW_G %d\n", window_g_199); + + print_two_tables(fp, window_g_199, &g_199, 0); + + fprintf(fp, "#else\n"); + fprintf(fp, " #error No known generator for the specified exhaustive test group order.\n"); + fprintf(fp, "#endif\n"); + fprintf(fp, "#else /* !defined(EXHAUSTIVE_TEST_ORDER) */\n"); + fprintf(fp, "#define WINDOW_G ECMULT_WINDOW_SIZE\n"); + + print_two_tables(fp, ECMULT_WINDOW_SIZE, &g, 1); + + fprintf(fp, "#endif\n"); + fprintf(fp, "#undef S\n"); + fprintf(fp, "#endif\n"); + fclose(fp); + + return 0; +} |