Disconnect hostapd from building in base
[dragonfly.git] / contrib / hostapd / src / crypto / crypto_internal-modexp.c
CommitLineData
4781064b
JM
1/*
2 * Crypto wrapper for internal crypto implementation - modexp
3 * Copyright (c) 2006-2009, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9#include "includes.h"
10
11#include "common.h"
12#include "tls/bignum.h"
13#include "crypto.h"
14
15
16int crypto_mod_exp(const u8 *base, size_t base_len,
17 const u8 *power, size_t power_len,
18 const u8 *modulus, size_t modulus_len,
19 u8 *result, size_t *result_len)
20{
21 struct bignum *bn_base, *bn_exp, *bn_modulus, *bn_result;
22 int ret = -1;
23
24 bn_base = bignum_init();
25 bn_exp = bignum_init();
26 bn_modulus = bignum_init();
27 bn_result = bignum_init();
28
29 if (bn_base == NULL || bn_exp == NULL || bn_modulus == NULL ||
30 bn_result == NULL)
31 goto error;
32
33 if (bignum_set_unsigned_bin(bn_base, base, base_len) < 0 ||
34 bignum_set_unsigned_bin(bn_exp, power, power_len) < 0 ||
35 bignum_set_unsigned_bin(bn_modulus, modulus, modulus_len) < 0)
36 goto error;
37
38 if (bignum_exptmod(bn_base, bn_exp, bn_modulus, bn_result) < 0)
39 goto error;
40
41 ret = bignum_get_unsigned_bin(bn_result, result, result_len);
42
43error:
44 bignum_deinit(bn_base);
45 bignum_deinit(bn_exp);
46 bignum_deinit(bn_modulus);
47 bignum_deinit(bn_result);
48 return ret;
49}