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crypto: hisilicon/hpre - add check before gx modulo p

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The result of gx modulo p is zero if gx is equal to p, so return
error immediately if gx is equal to p.

Signed-off-by: Hui Tang <tanghui20@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Hui Tang 2021-05-29 16:58:19 +08:00 committed by Herbert Xu
parent 1e609f5fb7
commit 9612581fc1
1 changed files with 5 additions and 1 deletions
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6
drivers/crypto/hisilicon/hpre/hpre_crypto.c
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@ -1841,8 +1841,12 @@ static int hpre_curve25519_src_init(struct hpre_asym_request *hpre_req,
* When src_data equals (2^255 - 19) ~ (2^255 - 1), it is out of p,
* we get its modulus to p, and then use it.
*/
if (memcmp(ptr, p, ctx->key_sz) >= 0)
if (memcmp(ptr, p, ctx->key_sz) == 0) {
dev_err(dev, "gx is p!\n");
return -EINVAL;
} else if (memcmp(ptr, p, ctx->key_sz) > 0) {
hpre_curve25519_src_modulo_p(ptr);
}
hpre_req->src = ptr;
msg->in = cpu_to_le64(dma);