[CRYPTO] skcipher: Add skcipher_geniv_alloc/skcipher_geniv_free
This patch creates the infrastructure to help the construction of givcipher
templates that wrap around existing blkcipher/ablkcipher algorithms by adding
an IV generator to them.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/crypto/ablkcipher.c b/crypto/ablkcipher.c
index 8f48b4d..092d965 100644
--- a/crypto/ablkcipher.c
+++ b/crypto/ablkcipher.c
@@ -80,6 +80,7 @@
crt->setkey = setkey;
crt->encrypt = alg->encrypt;
crt->decrypt = alg->decrypt;
+ crt->base = __crypto_ablkcipher_cast(tfm);
crt->ivsize = alg->ivsize;
return 0;
@@ -122,11 +123,13 @@
if (alg->ivsize > PAGE_SIZE / 8)
return -EINVAL;
- crt->setkey = setkey;
+ crt->setkey = tfm->__crt_alg->cra_flags & CRYPTO_ALG_GENIV ?
+ alg->setkey : setkey;
crt->encrypt = alg->encrypt;
crt->decrypt = alg->decrypt;
crt->givencrypt = alg->givencrypt;
crt->givdecrypt = alg->givdecrypt ?: no_givdecrypt;
+ crt->base = __crypto_ablkcipher_cast(tfm);
crt->ivsize = alg->ivsize;
return 0;
@@ -155,6 +158,11 @@
};
EXPORT_SYMBOL_GPL(crypto_givcipher_type);
+const char *crypto_default_geniv(const struct crypto_alg *alg)
+{
+ return alg->cra_flags & CRYPTO_ALG_ASYNC ? "eseqiv" : "chainiv";
+}
+
int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn, const char *name,
u32 type, u32 mask)
{