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crypto: null - remove the default null skcipher

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crypto_get_default_null_skcipher() and
crypto_put_default_null_skcipher() are no longer used, so remove them.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Eric Biggers 2025-05-05 12:10:43 -07:00 • committed by Herbert Xu
parent 0c08c72980
commit c10f66b0ac
2 changed files with 0 additions and 56 deletions
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53
crypto/crypto_null.c
View file

@ -17,13 +17,8 @@
#include <crypto/internal/skcipher.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/string.h>
static DEFINE_SPINLOCK(crypto_default_null_skcipher_lock);
static struct crypto_sync_skcipher *crypto_default_null_skcipher;
static int crypto_default_null_skcipher_refcnt;
static int null_init(struct shash_desc *desc)
{
return 0;
@ -129,54 +124,6 @@ static struct crypto_alg cipher_null = {
MODULE_ALIAS_CRYPTO("digest_null");
MODULE_ALIAS_CRYPTO("cipher_null");
struct crypto_sync_skcipher *crypto_get_default_null_skcipher(void)
{
struct crypto_sync_skcipher *ntfm = NULL;
struct crypto_sync_skcipher *tfm;
spin_lock_bh(&crypto_default_null_skcipher_lock);
tfm = crypto_default_null_skcipher;
if (!tfm) {
spin_unlock_bh(&crypto_default_null_skcipher_lock);
ntfm = crypto_alloc_sync_skcipher("ecb(cipher_null)", 0, 0);
if (IS_ERR(ntfm))
return ntfm;
spin_lock_bh(&crypto_default_null_skcipher_lock);
tfm = crypto_default_null_skcipher;
if (!tfm) {
tfm = ntfm;
ntfm = NULL;
crypto_default_null_skcipher = tfm;
}
}
crypto_default_null_skcipher_refcnt++;
spin_unlock_bh(&crypto_default_null_skcipher_lock);
crypto_free_sync_skcipher(ntfm);
return tfm;
}
EXPORT_SYMBOL_GPL(crypto_get_default_null_skcipher);
void crypto_put_default_null_skcipher(void)
{
struct crypto_sync_skcipher *tfm = NULL;
spin_lock_bh(&crypto_default_null_skcipher_lock);
if (!--crypto_default_null_skcipher_refcnt) {
tfm = crypto_default_null_skcipher;
crypto_default_null_skcipher = NULL;
}
spin_unlock_bh(&crypto_default_null_skcipher_lock);
crypto_free_sync_skcipher(tfm);
}
EXPORT_SYMBOL_GPL(crypto_put_default_null_skcipher);
static int __init crypto_null_mod_init(void)
{
int ret = 0;

3
include/crypto/null.h
View file

@ -9,7 +9,4 @@
#define NULL_DIGEST_SIZE 0
#define NULL_IV_SIZE 0
struct crypto_sync_skcipher *crypto_get_default_null_skcipher(void);
void crypto_put_default_null_skcipher(void);
#endif