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SAE: Clean up exponent calculation for PWE

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Signed-hostap: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2013-01-06 18:56:46 +02:00
parent 66fc91ab11
commit f05dad2090
1 changed files with 12 additions and 14 deletions
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26
src/common/sae.c
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@ -229,24 +229,22 @@ static int sae_test_pwd_seed_ffc(struct sae_data *sae, const u8 *pwd_seed,
*/
exp[0] = 2;
b = crypto_bignum_init_set(exp, sizeof(exp));
} else {
/* Calculate exponent: (p-1)/r */
exp[0] = 1;
b = crypto_bignum_init_set(exp, sizeof(exp));
if (b == NULL ||
crypto_bignum_sub(sae->prime, b, b) < 0 ||
crypto_bignum_div(b, sae->order, b) < 0) {
crypto_bignum_deinit(b, 0);
b = NULL;
}
}
if (a == NULL || b == NULL)
res = -1;
else
res = crypto_bignum_exptmod(a, b, sae->prime, pwe);
} else {
struct crypto_bignum *tmp;
exp[0] = 1;
b = crypto_bignum_init_set(exp, sizeof(exp));
tmp = crypto_bignum_init();
if (a == NULL || b == NULL || tmp == NULL ||
crypto_bignum_sub(sae->prime, b, tmp) < 0 ||
crypto_bignum_div(tmp, sae->order, b) < 0)
res = -1;
else
res = crypto_bignum_exptmod(a, b, sae->prime, pwe);
crypto_bignum_deinit(tmp, 0);
}
crypto_bignum_deinit(a, 0);
crypto_bignum_deinit(b, 0);