[PATCH 06/11] crypto: intel/keembay-ocs-ecc - Use crypto_stdrng_get_bytes()

[Eric Biggers <ebiggers@kernel.org>]

Replace the sequence of crypto_get_default_rng(),
crypto_rng_get_bytes(), and crypto_put_default_rng() with the equivalent
helper function crypto_stdrng_get_bytes().

Signed-off-by: Eric Biggers <ebiggers@kernel.org>
---
 drivers/crypto/intel/keembay/keembay-ocs-ecc.c | 17 ++++-------------
 1 file changed, 4 insertions(+), 13 deletions(-)

diff --git a/drivers/crypto/intel/keembay/keembay-ocs-ecc.c b/drivers/crypto/intel/keembay/keembay-ocs-ecc.c
index 59308926399d..e61a95f66a0c 100644
--- a/drivers/crypto/intel/keembay/keembay-ocs-ecc.c
+++ b/drivers/crypto/intel/keembay/keembay-ocs-ecc.c
@@ -228,16 +228,11 @@ static int kmb_ecc_point_mult(struct ocs_ecc_dev *ecc_dev,
 		      OCS_ECC_OP_SIZE_384 : OCS_ECC_OP_SIZE_256;
 	size_t nbytes = digits_to_bytes(curve->g.ndigits);
 	int rc = 0;
 
 	/* Generate random nbytes for Simple and Differential SCA protection. */
-	rc = crypto_get_default_rng();
-	if (rc)
-		return rc;
-
-	rc = crypto_rng_get_bytes(crypto_default_rng, sca, nbytes);
-	crypto_put_default_rng();
+	rc = crypto_stdrng_get_bytes(sca, nbytes);
 	if (rc)
 		return rc;
 
 	/* Wait engine to be idle before starting new operation. */
 	rc = ocs_ecc_wait_idle(ecc_dev);
@@ -507,18 +502,14 @@ static int kmb_ecc_gen_privkey(const struct ecc_curve *curve, u64 *privkey)
 	 * strength associated with N.
 	 *
 	 * The maximum security strength identified by NIST SP800-57pt1r4 for
 	 * ECC is 256 (N >= 512).
 	 *
-	 * This condition is met by the default RNG because it selects a favored
-	 * DRBG with a security strength of 256.
+	 * This condition is met by stdrng because it selects a favored DRBG
+	 * with a security strength of 256.
 	 */
-	if (crypto_get_default_rng())
-		return -EFAULT;
-
-	rc = crypto_rng_get_bytes(crypto_default_rng, (u8 *)priv, nbytes);
-	crypto_put_default_rng();
+	rc = crypto_stdrng_get_bytes(priv, nbytes);
 	if (rc)
 		goto cleanup;
 
 	rc = kmb_ecc_is_key_valid(curve, priv, nbytes);
 	if (rc)
-- 
2.53.0