crypto: skcipher - fix weak key check for lskciphers

When an algorithm of the new "lskcipher" type is exposed through the
"skcipher" API, calls to crypto_skcipher_setkey() don't pass on the
CRYPTO_TFM_REQ_FORBID_WEAK_KEYS flag to the lskcipher.  This causes
self-test failures for ecb(des), as weak keys are not rejected anymore.
Fix this.

Fixes: 31865c4c ("crypto: skcipher - Add lskcipher")
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

crypto/lskcipher.c

@@ -194,14 +194,6 @@ int crypto_lskcipher_decrypt(struct crypto_lskcipher *tfm, const u8 *src,
 }
 EXPORT_SYMBOL_GPL(crypto_lskcipher_decrypt);
 
-int crypto_lskcipher_setkey_sg(struct crypto_skcipher *tfm, const u8 *key,
-			       unsigned int keylen)
-{
-	struct crypto_lskcipher **ctx = crypto_skcipher_ctx(tfm);
-
-	return crypto_lskcipher_setkey(*ctx, key, keylen);
-}
-
 static int crypto_lskcipher_crypt_sg(struct skcipher_request *req,
 				     int (*crypt)(struct crypto_lskcipher *tfm,
 						  const u8 *src, u8 *dst,

crypto/skcipher.c

@@ -621,7 +621,13 @@ int crypto_skcipher_setkey(struct crypto_skcipher *tfm, const u8 *key,
 	int err;
 
 	if (cipher->co.base.cra_type != &crypto_skcipher_type) {
-		err = crypto_lskcipher_setkey_sg(tfm, key, keylen);
+		struct crypto_lskcipher **ctx = crypto_skcipher_ctx(tfm);
+
+		crypto_lskcipher_clear_flags(*ctx, CRYPTO_TFM_REQ_MASK);
+		crypto_lskcipher_set_flags(*ctx,
+					   crypto_skcipher_get_flags(tfm) &
+					   CRYPTO_TFM_REQ_MASK);
+		err = crypto_lskcipher_setkey(*ctx, key, keylen);
 		goto out;
 	}
 

crypto/skcipher.h

@@ -20,8 +20,6 @@ static inline struct crypto_istat_cipher *skcipher_get_stat_common(
 #endif
 }
 
-int crypto_lskcipher_setkey_sg(struct crypto_skcipher *tfm, const u8 *key,
-			       unsigned int keylen);
 int crypto_lskcipher_encrypt_sg(struct skcipher_request *req);
 int crypto_lskcipher_decrypt_sg(struct skcipher_request *req);
 int crypto_init_lskcipher_ops_sg(struct crypto_tfm *tfm);