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crypto: null - Remove default null blkcipher

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The default null blkcipher is no longer used and can now be removed.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2016-07-12 13:17:47 +08:00
parent da721302a7
commit 499a66e6b6
2 changed files with 17 additions and 46 deletions
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49
crypto/crypto_null.c
View file

@ -26,10 +26,8 @@
#include <linux/string.h>
static DEFINE_MUTEX(crypto_default_null_skcipher_lock);
static struct crypto_blkcipher *crypto_default_null_skcipher;
static struct crypto_skcipher *crypto_default_null_skcipher;
static int crypto_default_null_skcipher_refcnt;
static struct crypto_skcipher *crypto_default_null_skcipher2;
static int crypto_default_null_skcipher2_refcnt;
static int null_compress(struct crypto_tfm *tfm, const u8 *src,
unsigned int slen, u8 *dst, unsigned int *dlen)
@ -155,15 +153,16 @@ MODULE_ALIAS_CRYPTO("compress_null");
MODULE_ALIAS_CRYPTO("digest_null");
MODULE_ALIAS_CRYPTO("cipher_null");
struct crypto_blkcipher *crypto_get_default_null_skcipher(void)
struct crypto_skcipher *crypto_get_default_null_skcipher(void)
{
struct crypto_blkcipher *tfm;
struct crypto_skcipher *tfm;
mutex_lock(&crypto_default_null_skcipher_lock);
tfm = crypto_default_null_skcipher;
if (!tfm) {
tfm = crypto_alloc_blkcipher("ecb(cipher_null)", 0, 0);
tfm = crypto_alloc_skcipher("ecb(cipher_null)",
0, CRYPTO_ALG_ASYNC);
if (IS_ERR(tfm))
goto unlock;
@ -183,49 +182,13 @@ void crypto_put_default_null_skcipher(void)
{
mutex_lock(&crypto_default_null_skcipher_lock);
if (!--crypto_default_null_skcipher_refcnt) {
crypto_free_blkcipher(crypto_default_null_skcipher);
crypto_free_skcipher(crypto_default_null_skcipher);
crypto_default_null_skcipher = NULL;
}
mutex_unlock(&crypto_default_null_skcipher_lock);
}
EXPORT_SYMBOL_GPL(crypto_put_default_null_skcipher);
struct crypto_skcipher *crypto_get_default_null_skcipher2(void)
{
struct crypto_skcipher *tfm;
mutex_lock(&crypto_default_null_skcipher_lock);
tfm = crypto_default_null_skcipher2;
if (!tfm) {
tfm = crypto_alloc_skcipher("ecb(cipher_null)",
0, CRYPTO_ALG_ASYNC);
if (IS_ERR(tfm))
goto unlock;
crypto_default_null_skcipher2 = tfm;
}
crypto_default_null_skcipher2_refcnt++;
unlock:
mutex_unlock(&crypto_default_null_skcipher_lock);
return tfm;
}
EXPORT_SYMBOL_GPL(crypto_get_default_null_skcipher2);
void crypto_put_default_null_skcipher2(void)
{
mutex_lock(&crypto_default_null_skcipher_lock);
if (!--crypto_default_null_skcipher2_refcnt) {
crypto_free_skcipher(crypto_default_null_skcipher2);
crypto_default_null_skcipher2 = NULL;
}
mutex_unlock(&crypto_default_null_skcipher_lock);
}
EXPORT_SYMBOL_GPL(crypto_put_default_null_skcipher2);
static int __init crypto_null_mod_init(void)
{
int ret = 0;

14
include/crypto/null.h
View file

@ -8,9 +8,17 @@
#define NULL_DIGEST_SIZE 0
#define NULL_IV_SIZE 0
struct crypto_blkcipher *crypto_get_default_null_skcipher(void);
struct crypto_skcipher *crypto_get_default_null_skcipher(void);
void crypto_put_default_null_skcipher(void);
struct crypto_skcipher *crypto_get_default_null_skcipher2(void);
void crypto_put_default_null_skcipher2(void);
static inline struct crypto_skcipher *crypto_get_default_null_skcipher2(void)
{
return crypto_get_default_null_skcipher();
}
static inline void crypto_put_default_null_skcipher2(void)
{
crypto_put_default_null_skcipher();
}
#endif