crypto: akcipher - default implementations for request callbacks

Herbert,

This is reworked version of "[PATCH v7 02/11] crypto: akcipher - check the presence of callback before the call".

All checks inside of akcipher wrappers for the callbacks handling akcipher_requests are removed and replaced with default akcipher_default_op() callback.

Checks in crypto_akcipher_maxsize() are just removed altogether without any replacement, because this callback is always defined.

Also, sanity checks for (!req->dst && req->dst_len) which was introduced in "[PATCH v7 04/11] crypto: akcipher - new verify API for public key algorithms" are removed, assuming this should be checked in the drivers if needed.

Commit "PATCH v7 01/11] KEYS: report to keyctl only actually supported key ops" is also will be removed in the next patchset, as you agreed.

Thanks,

--- commit ---

Because with the introduction of EC-RDSA and change in workings of RSA in regard to sign/verify, akcipher could have not all callbacks defined, check the presence of callbacks in crypto_register_akcipher() and provide default implementation if the callback is not implemented.

This is suggested by Herbert Xu instead of checking the presence of the callback on every request.

---
 crypto/akcipher.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

index 0cbeae137e0a..780daa436dac 100644
@@ -119,10 +119,24 @@ static void akcipher_prepare_alg(struct akcipher_alg *alg)
 	base->cra_flags |= CRYPTO_ALG_TYPE_AKCIPHER;
 }
 
+static int akcipher_default_op(struct akcipher_request *req)
+{
+	return -ENOSYS;
+}
+
 int crypto_register_akcipher(struct akcipher_alg *alg)
 {
 	struct crypto_alg *base = &alg->base;
 
+	if (!alg->sign)
+		alg->sign = akcipher_default_op;
+	if (!alg->verify)
+		alg->verify = akcipher_default_op;
+	if (!alg->encrypt)
+		alg->encrypt = akcipher_default_op;
+	if (!alg->decrypt)
+		alg->decrypt = akcipher_default_op;
+
 	akcipher_prepare_alg(alg);
 	return crypto_register_alg(base);
 }

2.11.0