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Share common SAE and EAP-pwd functionality: own scalar generation

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Use a shared helper function for deriving rand, mask, and own scalar.

Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
This commit is contained in:
Jouni Malinen 2019-04-26 17:33:44 +03:00 • committed by Jouni Malinen
parent c3805fb623
commit 73338db029
4 changed files with 57 additions and 104 deletions
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23
src/eap_common/eap_pwd_common.c
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@ -436,25 +436,6 @@ int eap_pwd_get_rand_mask(EAP_PWD_group *group, struct crypto_bignum *_rand,
struct crypto_bignum *_mask,
struct crypto_bignum *scalar)
{
const struct crypto_bignum *order;
int count;
order = crypto_ec_get_order(group->group);
/* Select two random values rand,mask such that 1 < rand,mask < r and
* rand + mask mod r > 1. */
for (count = 0; count < 100; count++) {
if (crypto_bignum_rand(_rand, order) == 0 &&
!crypto_bignum_is_zero(_rand) &&
crypto_bignum_rand(_mask, order) == 0 &&
!crypto_bignum_is_zero(_mask) &&
crypto_bignum_add(_rand, _mask, scalar) == 0 &&
crypto_bignum_mod(scalar, order, scalar) == 0 &&
!crypto_bignum_is_zero(scalar) &&
!crypto_bignum_is_one(scalar))
return 0;
}
wpa_printf(MSG_INFO, "EAP-pwd: unable to get randomness");
return -1;
return dragonfly_generate_scalar(crypto_ec_get_order(group->group),
_rand, _mask, scalar);
}