101 lines
3.7 KiB
C
101 lines
3.7 KiB
C
/*********************************************************************************
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* Copyright (c) 2013, 2014, 2015, 2021 Thomas Daede, Cory Fields, Pieter Wuille *
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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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#include <inttypes.h>
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#include <stdio.h>
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#include "../include/secp256k1.h"
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#include "assumptions.h"
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#include "util.h"
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#include "group.h"
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#include "int128_impl.h"
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#include "ecmult_gen.h"
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#include "ecmult_gen_compute_table_impl.h"
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static const int CONFIGS[][2] = {
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{2, 5},
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{11, 6},
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{43, 6}
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};
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static void print_table(FILE* fp, int blocks, int teeth) {
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int spacing = CEIL_DIV(256, blocks * teeth);
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size_t points = ((size_t)1) << (teeth - 1);
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int outer;
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size_t inner;
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secp256k1_ge_storage* table = checked_malloc(&default_error_callback, blocks * points * sizeof(secp256k1_ge_storage));
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secp256k1_ecmult_gen_compute_table(table, &secp256k1_ge_const_g, blocks, teeth, spacing);
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fprintf(fp, "#elif (COMB_BLOCKS == %d) && (COMB_TEETH == %d) && (COMB_SPACING == %d)\n", blocks, teeth, spacing);
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for (outer = 0; outer != blocks; outer++) {
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fprintf(fp,"{");
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for (inner = 0; inner != points; inner++) {
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fprintf(fp, "S(%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32
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",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32")",
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SECP256K1_GE_STORAGE_CONST_GET(table[outer * points + inner]));
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if (inner != points - 1) {
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fprintf(fp,",\n");
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}
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}
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if (outer != blocks - 1) {
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fprintf(fp,"},\n");
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} else {
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fprintf(fp,"}\n");
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}
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}
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free(table);
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}
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int main(int argc, char **argv) {
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const char outfile[] = "src/precomputed_ecmult_gen.c";
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FILE* fp;
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size_t config;
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int did_current_config = 0;
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(void)argc;
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(void)argv;
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fp = fopen(outfile, "w");
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if (fp == NULL) {
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fprintf(stderr, "Could not open %s for writing!\n", outfile);
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return -1;
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}
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fprintf(fp, "/* This file was automatically generated by precompute_ecmult_gen. */\n");
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fprintf(fp, "/* See ecmult_gen_impl.h for details about the contents of this file. */\n");
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fprintf(fp, "#include \"group.h\"\n");
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fprintf(fp, "#include \"ecmult_gen.h\"\n");
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fprintf(fp, "#include \"precomputed_ecmult_gen.h\"\n");
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fprintf(fp, "#ifdef EXHAUSTIVE_TEST_ORDER\n");
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fprintf(fp, "# error Cannot compile precomputed_ecmult_gen.c in exhaustive test mode\n");
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fprintf(fp, "#endif /* EXHAUSTIVE_TEST_ORDER */\n");
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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");
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fprintf(fp, "const secp256k1_ge_storage secp256k1_ecmult_gen_prec_table[COMB_BLOCKS][COMB_POINTS] = {\n");
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fprintf(fp, "#if 0\n");
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for (config = 0; config < sizeof(CONFIGS) / sizeof(*CONFIGS); ++config) {
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print_table(fp, CONFIGS[config][0], CONFIGS[config][1]);
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if (CONFIGS[config][0] == COMB_BLOCKS && CONFIGS[config][1] == COMB_TEETH) {
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did_current_config = 1;
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}
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}
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if (!did_current_config) {
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print_table(fp, COMB_BLOCKS, COMB_TEETH);
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}
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fprintf(fp, "#else\n");
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fprintf(fp, "# error Configuration mismatch, invalid COMB_* parameters. Try deleting precomputed_ecmult_gen.c before the build.\n");
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fprintf(fp, "#endif\n");
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fprintf(fp, "};\n");
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fprintf(fp, "#undef S\n");
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fclose(fp);
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return 0;
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}
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