crypto: cryptd - Add support to access underlaying shash
cryptd_alloc_ahash() will allocate a cryptd-ed ahash for specified
algorithm name. The new allocated one is guaranteed to be cryptd-ed
ahash, so the shash underlying can be gotten via cryptd_ahash_child().
Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/crypto/cryptd.c b/crypto/cryptd.c
index 2eb7058..3533582 100644
--- a/crypto/cryptd.c
+++ b/crypto/cryptd.c
@@ -682,6 +682,41 @@
}
EXPORT_SYMBOL_GPL(cryptd_free_ablkcipher);
+struct cryptd_ahash *cryptd_alloc_ahash(const char *alg_name,
+ u32 type, u32 mask)
+{
+ char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
+ struct crypto_ahash *tfm;
+
+ if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
+ "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
+ return ERR_PTR(-EINVAL);
+ tfm = crypto_alloc_ahash(cryptd_alg_name, type, mask);
+ if (IS_ERR(tfm))
+ return ERR_CAST(tfm);
+ if (tfm->base.__crt_alg->cra_module != THIS_MODULE) {
+ crypto_free_ahash(tfm);
+ return ERR_PTR(-EINVAL);
+ }
+
+ return __cryptd_ahash_cast(tfm);
+}
+EXPORT_SYMBOL_GPL(cryptd_alloc_ahash);
+
+struct crypto_shash *cryptd_ahash_child(struct cryptd_ahash *tfm)
+{
+ struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(&tfm->base);
+
+ return ctx->child;
+}
+EXPORT_SYMBOL_GPL(cryptd_ahash_child);
+
+void cryptd_free_ahash(struct cryptd_ahash *tfm)
+{
+ crypto_free_ahash(&tfm->base);
+}
+EXPORT_SYMBOL_GPL(cryptd_free_ahash);
+
static int __init cryptd_init(void)
{
int err;
