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/*****************************************************************************************************
* 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;
}
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