crypto: drivers - Drop sign/verify operations

The drivers aspeed-acry.c, hpre_crypto.c and jh7110-rsa.c purport to
implement sign/verify operations for raw (unpadded) "rsa".

But there is no such thing as message digests generally need to be
padded according to a predefined scheme (such as PSS or PKCS#1) to
match the size of the usually much larger RSA keys.

The bogus sign/verify operations defined by these drivers are never
called but block removal of sign/verify from akcipher_alg.  Drop them.

Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/aspeed/aspeed-acry.c

@@ -601,8 +601,6 @@ static struct aspeed_acry_alg aspeed_acry_akcipher_algs[] = {
 		.akcipher.base = {
 			.encrypt = aspeed_acry_rsa_enc,
 			.decrypt = aspeed_acry_rsa_dec,
-			.sign = aspeed_acry_rsa_dec,
-			.verify = aspeed_acry_rsa_enc,
 			.set_pub_key = aspeed_acry_rsa_set_pub_key,
 			.set_priv_key = aspeed_acry_rsa_set_priv_key,
 			.max_size = aspeed_acry_rsa_max_size,

drivers/crypto/hisilicon/hpre/hpre_crypto.c

@@ -2006,8 +2006,6 @@ static void hpre_curve25519_exit_tfm(struct crypto_kpp *tfm)
 }
 
 static struct akcipher_alg rsa = {
-	.sign = hpre_rsa_dec,
-	.verify = hpre_rsa_enc,
 	.encrypt = hpre_rsa_enc,
 	.decrypt = hpre_rsa_dec,
 	.set_pub_key = hpre_rsa_setpubkey,

drivers/crypto/starfive/jh7110-rsa.c

@@ -565,8 +565,6 @@ static void starfive_rsa_exit_tfm(struct crypto_akcipher *tfm)
 static struct akcipher_alg starfive_rsa = {
 	.encrypt = starfive_rsa_enc,
 	.decrypt = starfive_rsa_dec,
-	.sign = starfive_rsa_dec,
-	.verify = starfive_rsa_enc,
 	.set_pub_key = starfive_rsa_set_pub_key,
 	.set_priv_key = starfive_rsa_set_priv_key,
 	.max_size = starfive_rsa_max_size,