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authorHerbert Xu <herbert@gondor.apana.org.au>2023-05-19 11:28:35 +0300
committerHerbert Xu <herbert@gondor.apana.org.au>2023-05-24 13:12:33 +0300
commit51d8d6d0f4bedb6a4e9afb20857bb592424de144 (patch)
treeb419114f9f46758e6c27b9d39cfa68ab2550fe0c /crypto
parentcf2eddc931ab6e4dd96d38bd75ef8aac3422a8f4 (diff)
downloadlinux-51d8d6d0f4bedb6a4e9afb20857bb592424de144.tar.xz
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')
-rw-r--r--crypto/cipher.c23
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);