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| author | Herbert Xu <herbert@gondor.apana.org.au> | 2016-07-12 07:17:32 +0200 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2016-07-18 11:35:37 +0200 |
| commit | a0129733a3f5eaa973c1ea76848d905b851548f1 (patch) | |
| tree | 38cc14bf68e805cf0c5a7ea2b5998961fb10f63a /crypto/crypto_null.c | |
| parent | crypto: skcipher - Add low-level skcipher interface (diff) | |
| download | linux-a0129733a3f5eaa973c1ea76848d905b851548f1.tar.xz linux-a0129733a3f5eaa973c1ea76848d905b851548f1.zip | |
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: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/crypto_null.c')
| -rw-r--r-- | crypto/crypto_null.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/crypto/crypto_null.c b/crypto/crypto_null.c index 941c9a434d50..c3f683910d07 100644 --- a/crypto/crypto_null.c +++ b/crypto/crypto_null.c @@ -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; |