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wolfSSL: Fix crypto_ecdh_* with ECC_TIMING_RESISTANT

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It looks like crypto_ecdh_set_peerkey() had started failing at some
point with a wolfSSL update due to ECC_TIMING_RESISTANT from
--enable-harden requiring RNG to be set.

Signed-off-by: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2022-04-18 00:54:37 +03:00
parent ae1fb64550
commit d7b8c6eef2
1 changed files with 13 additions and 8 deletions
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21
src/crypto/crypto_wolfssl.c
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@ -1706,33 +1706,37 @@ int crypto_ec_point_cmp(const struct crypto_ec *e,
struct crypto_ecdh {
struct crypto_ec *ec;
WC_RNG rng;
};
struct crypto_ecdh * crypto_ecdh_init(int group)
{
struct crypto_ecdh *ecdh = NULL;
WC_RNG rng;
int ret;
if (wc_InitRng(&rng) != 0)
goto fail;
ecdh = os_zalloc(sizeof(*ecdh));
if (!ecdh)
goto fail;
if (wc_InitRng(&ecdh->rng) != 0)
goto fail;
ecdh->ec = crypto_ec_init(group);
if (!ecdh->ec)
goto fail;
ret = wc_ecc_make_key_ex(&rng, ecdh->ec->key.dp->size, &ecdh->ec->key,
ecdh->ec->key.dp->id);
ret = wc_ecc_make_key_ex(&ecdh->rng, ecdh->ec->key.dp->size,
&ecdh->ec->key, ecdh->ec->key.dp->id);
if (ret < 0)
goto fail;
done:
wc_FreeRng(&rng);
#ifdef ECC_TIMING_RESISTANT
ret = wc_ecc_set_rng(&ecdh->ec->key, &ecdh->rng);
if (ret < 0)
goto fail;
#endif /* ECC_TIMING_RESISTANT */
done:
return ecdh;
fail:
crypto_ecdh_deinit(ecdh);
@ -1745,6 +1749,7 @@ void crypto_ecdh_deinit(struct crypto_ecdh *ecdh)
{
if (ecdh) {
crypto_ec_deinit(ecdh->ec);
wc_FreeRng(&ecdh->rng);
os_free(ecdh);
}
}