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crypto: hisilicon/hpre - ensure private key less than n

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The private key of the curve key size generated by stdrng, which maybe
not less than n. Therefore, the private key with the curve key size
minus 1 is generated to ensure that the private key is less than n.

Signed-off-by: Weili Qian <qianweili@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Weili Qian 2023-07-07 21:18:19 +08:00 committed by Herbert Xu
parent b3882fa2a1
commit b0ab0797f7
1 changed files with 8 additions and 2 deletions
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10
drivers/crypto/hisilicon/hpre/hpre_crypto.c
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@ -1392,9 +1392,9 @@ static int hpre_ecdh_set_secret(struct crypto_kpp *tfm, const void *buf,
unsigned int len)
{
struct hpre_ctx *ctx = kpp_tfm_ctx(tfm);
unsigned int sz, sz_shift, curve_sz;
struct device *dev = ctx->dev;
char key[HPRE_ECC_MAX_KSZ];
unsigned int sz, sz_shift;
struct ecdh params;
int ret;
@ -1406,7 +1406,13 @@ static int hpre_ecdh_set_secret(struct crypto_kpp *tfm, const void *buf,
/* Use stdrng to generate private key */
if (!params.key || !params.key_size) {
params.key = key;
params.key_size = hpre_ecdh_get_curvesz(ctx->curve_id);
curve_sz = hpre_ecdh_get_curvesz(ctx->curve_id);
if (!curve_sz) {
dev_err(dev, "Invalid curve size!\n");
return -EINVAL;
}
params.key_size = curve_sz - 1;
ret = ecdh_gen_privkey(ctx, &params);
if (ret)
return ret;