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Share common SAE and EAP-pwd functionality: random qr/qnr creation

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Use a shared helper function to create random qr/qnr values.

Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
This commit is contained in:
Jouni Malinen 2019-04-25 20:18:27 +03:00 • committed by Jouni Malinen
parent 2b84ca4dd9
commit 6c9543fcb7
4 changed files with 41 additions and 55 deletions
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33
src/common/dragonfly.c
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@ -10,6 +10,7 @@
#include "utils/includes.h"
#include "utils/common.h"
#include "crypto/crypto.h"
#include "dragonfly.h"
@ -25,3 +26,35 @@ int dragonfly_suitable_group(int group, int ecc_only)
(!ecc_only &&
(group == 15 || group == 16 || group == 17 || group == 18));
}
int dragonfly_get_random_qr_qnr(const struct crypto_bignum *prime,
struct crypto_bignum **qr,
struct crypto_bignum **qnr)
{
*qr = *qnr = NULL;
while (!(*qr) || !(*qnr)) {
struct crypto_bignum *tmp;
int res;
tmp = crypto_bignum_init();
if (!tmp || crypto_bignum_rand(tmp, prime) < 0)
break;
res = crypto_bignum_legendre(tmp, prime);
if (res == 1 && !(*qr))
*qr = tmp;
else if (res == -1 && !(*qnr))
*qnr = tmp;
else
crypto_bignum_deinit(tmp, 0);
}
if (*qr && *qnr)
return 0;
crypto_bignum_deinit(*qr, 0);
crypto_bignum_deinit(*qnr, 0);
*qr = *qnr = NULL;
return -1;
}