diff options
| author | Herbert Xu | 2023-05-19 16:28:35 +0800 |
|---|---|---|
| committer | Herbert Xu | 2023-05-24 18:12:33 +0800 |
| commit | 51d8d6d0f4bedb6a4e9afb20857bb592424de144 (patch) | |
| tree | b419114f9f46758e6c27b9d39cfa68ab2550fe0c /crypto/cipher.c | |
| parent | cf2eddc931ab6e4dd96d38bd75ef8aac3422a8f4 (diff) | |
crypto: cipher - Add crypto_clone_cipher
Allow simple ciphers to be cloned, if they don't have a cra_init
function. This basically rules out those ciphers that require a
fallback.
In future simple ciphers will be eliminated, and replaced with a
linear skcipher interface. When that happens this restriction will
disappear.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/cipher.c')
| -rw-r--r-- | crypto/cipher.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/crypto/cipher.c b/crypto/cipher.c index b47141ed4a9f..d39ef5f72ab8 100644 --- a/crypto/cipher.c +++ b/crypto/cipher.c @@ -90,3 +90,26 @@ void crypto_cipher_decrypt_one(struct crypto_cipher *tfm, cipher_crypt_one(tfm, dst, src, false); } EXPORT_SYMBOL_NS_GPL(crypto_cipher_decrypt_one, CRYPTO_INTERNAL); + +struct crypto_cipher *crypto_clone_cipher(struct crypto_cipher *cipher) +{ + struct crypto_tfm *tfm = crypto_cipher_tfm(cipher); + struct crypto_alg *alg = tfm->__crt_alg; + struct crypto_cipher *ncipher; + struct crypto_tfm *ntfm; + + if (alg->cra_init) + return ERR_PTR(-ENOSYS); + + ntfm = __crypto_alloc_tfm(alg, CRYPTO_ALG_TYPE_CIPHER, + CRYPTO_ALG_TYPE_MASK); + if (IS_ERR(ntfm)) + return ERR_CAST(ntfm); + + ntfm->crt_flags = tfm->crt_flags; + + ncipher = __crypto_cipher_cast(ntfm); + + return ncipher; +} +EXPORT_SYMBOL_GPL(crypto_clone_cipher); |