Subject: [RFC PATCH 18/21] crypto: compress_null - drop obsolete 'comp' implementation

From: Ard Biesheuvel <[email-masked]>
Date: Tue, 18 Jul 2023 14:58:44 +0200

The 'comp' API is obsolete and will be removed, so remove this comp
implementation.

Signed-off-by: Ard Biesheuvel <[email-masked]>
---
 crypto/crypto_null.c | 31 ++++----------------
 crypto/testmgr.c     |  3 --
 2 files changed, 5 insertions(+), 29 deletions(-)

diff --git a/crypto/crypto_null.c b/crypto/crypto_null.c
index 5b84b0f7cc178fcd..75e73b1d6df01cc6 100644
--- a/crypto/crypto_null.c
+++ b/crypto/crypto_null.c
@@ -24,16 +24,6 @@ static DEFINE_MUTEX(crypto_default_null_skcipher_lock);
 static struct crypto_sync_skcipher *crypto_default_null_skcipher;
 static int crypto_default_null_skcipher_refcnt;
 
-static int null_compress(struct crypto_tfm *tfm, const u8 *src,
-			 unsigned int slen, u8 *dst, unsigned int *dlen)
-{
-	if (slen > *dlen)
-		return -EINVAL;
-	memcpy(dst, src, slen);
-	*dlen = slen;
-	return 0;
-}
-
 static int null_init(struct shash_desc *desc)
 {
 	return 0;
@@ -121,7 +111,7 @@ static struct skcipher_alg skcipher_null = {
 	.decrypt		=	null_skcipher_crypt,
 };
 
-static struct crypto_alg null_algs[] = { {
+static struct crypto_alg cipher_null = {
 	.cra_name		=	"cipher_null",
 	.cra_driver_name	=	"cipher_null-generic",
 	.cra_flags		=	CRYPTO_ALG_TYPE_CIPHER,
@@ -134,19 +124,8 @@ static struct crypto_alg null_algs[] = { {
 	.cia_setkey		= 	null_setkey,
 	.cia_encrypt		=	null_crypt,
 	.cia_decrypt		=	null_crypt } }
-}, {
-	.cra_name		=	"compress_null",
-	.cra_driver_name	=	"compress_null-generic",
-	.cra_flags		=	CRYPTO_ALG_TYPE_COMPRESS,
-	.cra_blocksize		=	NULL_BLOCK_SIZE,
-	.cra_ctxsize		=	0,
-	.cra_module		=	THIS_MODULE,
-	.cra_u			=	{ .compress = {
-	.coa_compress		=	null_compress,
-	.coa_decompress		=	null_compress } }
-} };
+};
 
-MODULE_ALIAS_CRYPTO("compress_null");
 MODULE_ALIAS_CRYPTO("digest_null");
 MODULE_ALIAS_CRYPTO("cipher_null");
 
@@ -189,7 +168,7 @@ static int __init crypto_null_mod_init(void)
 {
 	int ret = 0;
 
-	ret = crypto_register_algs(null_algs, ARRAY_SIZE(null_algs));
+	ret = crypto_register_alg(&cipher_null);
 	if (ret < 0)
 		goto out;
 
@@ -206,14 +185,14 @@ static int __init crypto_null_mod_init(void)
 out_unregister_shash:
 	crypto_unregister_shash(&digest_null);
 out_unregister_algs:
-	crypto_unregister_algs(null_algs, ARRAY_SIZE(null_algs));
+	crypto_unregister_alg(&cipher_null);
 out:
 	return ret;
 }
 
 static void __exit crypto_null_mod_fini(void)
 {
-	crypto_unregister_algs(null_algs, ARRAY_SIZE(null_algs));
+	crypto_unregister_alg(&cipher_null);
 	crypto_unregister_shash(&digest_null);
 	crypto_unregister_skcipher(&skcipher_null);
 }
diff --git a/crypto/testmgr.c b/crypto/testmgr.c
index 4971351f55dbabb9..e4b6d67233763193 100644
--- a/crypto/testmgr.c
+++ b/crypto/testmgr.c
@@ -4633,9 +4633,6 @@ static const struct alg_test_desc alg_test_descs[] = {
 		.suite = {
 			.hash = __VECS(sm4_cmac128_tv_template)
 		}
-	}, {
-		.alg = "compress_null",
-		.test = alg_test_null,
 	}, {
 		.alg = "crc32",
 		.test = alg_test_hash,
-- 
2.39.2