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crypto: null - Add new default null skcipher

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Current the default null skcipher is actually a crypto_blkcipher.
This patch creates a synchronous crypto_skcipher version of the
null cipher which unfortunately has to settle for the name skcipher2.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2016-07-12 13:17:32 +08:00
parent 4e6c3df4d7
commit a0129733a3
2 changed files with 40 additions and 0 deletions
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38
crypto/crypto_null.c
View File

@ -28,6 +28,8 @@
static DEFINE_MUTEX(crypto_default_null_skcipher_lock);
static struct crypto_blkcipher *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)
@ -188,6 +190,42 @@ void crypto_put_default_null_skcipher(void)
}
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;

2
include/crypto/null.h
View File

@ -10,5 +10,7 @@
struct crypto_blkcipher *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);
#endif