precompute_ecmult.c File Reference

#include <inttypes.h>
#include <stdio.h>
#include "libsecp256k1-config.h"
#include "../include/secp256k1.h"
#include "assumptions.h"
#include "util.h"
#include "field_impl.h"
#include "group_impl.h"
#include "ecmult.h"
#include "ecmult_compute_table_impl.h"

Include dependency graph for precompute_ecmult.c:

Go to the source code of this file.

Functions
int	main (void)

Function Documentation

main()

int main

(

void

)

Definition at line 59 of file precompute_ecmult.c.

               {
    /* Always compute all tables for window sizes up to 15. */
    int window_g = (ECMULT_WINDOW_SIZE < 15) ? 15 : ECMULT_WINDOW_SIZE;
    FILE* fp;
 
    fp = fopen("src/precomputed_ecmult.c","w");
    if (fp == NULL) {
        fprintf(stderr, "Could not open src/precomputed_ecmult.h for writing!\n");
        return -1;
    }
 
    fprintf(fp, "/* This file was automatically generated by precompute_ecmult. */\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, "#if defined HAVE_CONFIG_H\n");
    fprintf(fp, "#    include \"libsecp256k1-config.h\"\n");
    fprintf(fp, "#endif\n");
    fprintf(fp, "#include \"../include/secp256k1.h\"\n");
    fprintf(fp, "#include \"group.h\"\n");
    fprintf(fp, "#include \"ecmult.h\"\n");
    fprintf(fp, "#include \"precomputed_ecmult.h\"\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_WINDOW_SIZE > %d\n", window_g);
    fprintf(fp, "   #error configuration mismatch, invalid ECMULT_WINDOW_SIZE. Try deleting precomputed_ecmult.c before the build.\n");
    fprintf(fp, "#endif\n");
    fprintf(fp, "#ifdef EXHAUSTIVE_TEST_ORDER\n");
    fprintf(fp, "#    error Cannot compile precomputed_ecmult.c in exhaustive test mode\n");
    fprintf(fp, "#endif /* EXHAUSTIVE_TEST_ORDER */\n");
    fprintf(fp, "#define WINDOW_G ECMULT_WINDOW_SIZE\n");
 
    print_two_tables(fp, window_g);
 
    fprintf(fp, "#undef S\n");
    fclose(fp);
 
    return 0;
}