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precompute_ecmult: Always compute all tables up to default WINDOW_G

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Also simplify #ifdefs in generated file.
This commit is contained in:
Tim Ruffing
2021-12-20 14:16:14 +01:00
parent be6944ade9
commit 10461d8bd3
2 changed files with 32 additions and 30 deletions
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8
src/precompute_ecmult.c
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@@ -32,7 +32,7 @@ static void print_table(FILE *fp, const char *name, int window_g, const secp256k
j = 1;
for(i = 3; i <= window_g; ++i) {
fprintf(fp, "#if ECMULT_TABLE_SIZE(WINDOW_G) > %ld\n", ECMULT_TABLE_SIZE(i-1));
fprintf(fp, "#if WINDOW_G > %d\n", i-1);
for(;j < ECMULT_TABLE_SIZE(i); ++j) {
fprintf(fp, ",S(%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32
",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32")\n",
@@ -57,6 +57,8 @@ static void print_two_tables(FILE *fp, int window_g) {
}
int main(void) {
/* 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");
@@ -77,7 +79,7 @@ int main(void) {
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_TABLE_SIZE(ECMULT_WINDOW_SIZE) > %ld\n", ECMULT_TABLE_SIZE(ECMULT_WINDOW_SIZE));
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");
@@ -85,7 +87,7 @@ int main(void) {
fprintf(fp, "#endif /* EXHAUSTIVE_TEST_ORDER */\n");
fprintf(fp, "#define WINDOW_G ECMULT_WINDOW_SIZE\n");
print_two_tables(fp, ECMULT_WINDOW_SIZE);
print_two_tables(fp, window_g);
fprintf(fp, "#undef S\n");
fclose(fp);