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/* $OpenBSD: bn_to_string.c,v 1.3 2023/02/13 04:26:32 jsing Exp $ */
/*
* Copyright (c) 2019 Theo Buehler <tb@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/bn.h>
char *bn_to_string(const BIGNUM *bn);
struct convert_st {
const char *input;
const char *expected;
};
struct convert_st testcases[] = {
{"0", "0"},
{"-0", "0"},
{"7", "7"},
{"-7", "-7"},
{"8", "8"},
{"-8", "-8"},
{"F", "15"},
{"-F", "-15"},
{"10", "16"},
{"-10", "-16"},
{"7F", "127"},
{"-7F", "-127"},
{"80", "128"},
{"-80", "-128"},
{"FF", "255"},
{"-FF", "-255"},
{"100", "256"},
{"7FFF", "32767"},
{"-7FFF", "-32767"},
{"8000", "32768"},
{"-8000", "-32768"},
{"FFFF", "65535"},
{"-FFFF", "-65535"},
{"10000", "65536"},
{"-10000", "-65536"},
{"7FFFFFFF", "2147483647"},
{"-7FFFFFFF", "-2147483647"},
{"80000000", "2147483648"},
{"-80000000", "-2147483648"},
{"FFFFFFFF", "4294967295"},
{"-FFFFFFFF", "-4294967295"},
{"100000000", "4294967296"},
{"-100000000", "-4294967296"},
{"7FFFFFFFFFFFFFFF", "9223372036854775807"},
{"-7FFFFFFFFFFFFFFF", "-9223372036854775807"},
{"8000000000000000", "9223372036854775808"},
{"-8000000000000000", "-9223372036854775808"},
{"FFFFFFFFFFFFFFFF", "18446744073709551615"},
{"-FFFFFFFFFFFFFFFF", "-18446744073709551615"},
{"10000000000000000", "18446744073709551616"},
{"-10000000000000000", "-18446744073709551616"},
{"7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF",
"170141183460469231731687303715884105727"},
{"-7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF",
"-170141183460469231731687303715884105727"},
{"80000000000000000000000000000000",
"0x80000000000000000000000000000000"},
{"-80000000000000000000000000000000",
"-0x80000000000000000000000000000000"},
{"FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF",
"0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"},
{"-FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF",
"-0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"},
{"100000000000000000000000000000000",
"0x0100000000000000000000000000000000"},
{"-100000000000000000000000000000000",
"-0x0100000000000000000000000000000000"},
{ NULL, NULL },
};
int
main(int argc, char *argv[])
{
struct convert_st *test;
BIGNUM *bn = NULL;
char *bnstr;
int failed = 0;
for (test = testcases; test->input != NULL; test++) {
if (!BN_hex2bn(&bn, test->input))
errx(1, "BN_hex2bn(%s)", test->input);
if ((bnstr = bn_to_string(bn)) == NULL)
errx(1, "bn_to_string(%s)", test->input);
if (strcmp(bnstr, test->expected) != 0) {
warnx("%s != %s", bnstr, test->expected);
failed = 1;
}
free(bnstr);
}
BN_free(bn);
return failed;
}
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