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Share common SAE and EAP-pwd functionality: random 1..p-1 creation

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Use a shared helper function to create a random value in 1..p-1 range
for is_quadratic_residue().

Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
This commit is contained in:
Jouni Malinen 2019-04-25 20:43:41 +03:00 • committed by Jouni Malinen
parent 6c9543fcb7
commit a9615b1b88
4 changed files with 33 additions and 46 deletions
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22
src/common/dragonfly.c
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@ -58,3 +58,25 @@ int dragonfly_get_random_qr_qnr(const struct crypto_bignum *prime,
*qr = *qnr = NULL;
return -1;
}
struct crypto_bignum *
dragonfly_get_rand_1_to_p_1(const struct crypto_bignum *prime)
{
struct crypto_bignum *tmp, *pm1, *one;
tmp = crypto_bignum_init();
pm1 = crypto_bignum_init();
one = crypto_bignum_init_set((const u8 *) "\x01", 1);
if (!tmp || !pm1 || !one ||
crypto_bignum_sub(prime, one, pm1) < 0 ||
crypto_bignum_rand(tmp, pm1) < 0 ||
crypto_bignum_add(tmp, one, tmp) < 0) {
crypto_bignum_deinit(tmp, 0);
tmp = NULL;
}
crypto_bignum_deinit(pm1, 0);
crypto_bignum_deinit(one, 0);
return tmp;
}