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Commit a0129733 authored by Herbert Xu's avatar Herbert Xu
Browse files

crypto: null - Add new default null skcipher 



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: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 4e6c3df4

crypto/crypto_null.c

+38 −0
Original line number Diff line number Diff line
@@ -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;

include/crypto/null.h

+2 −0
Original line number Diff line number Diff line
@@ -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