crypto: hash - Add crypto_clone_ahash/shash

[linux-2.6-block.git] / crypto / shash.c

diff --git a/crypto/shash.c b/crypto/shash.c
index 4cefa614dbbdd28f96c2e938dd41e9d93b04d7fc..5845b7d59b2f259ef0fa00475b8e805ebb5a0bb3 100644 (file)
--- a/crypto/shash.c
+++ b/crypto/shash.c
@@ -445,6 +445,24 @@ int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
        return 0;
 }
 
+struct crypto_ahash *crypto_clone_shash_ops_async(struct crypto_ahash *nhash,
+                                                 struct crypto_ahash *hash)
+{
+       struct crypto_shash **nctx = crypto_ahash_ctx(nhash);
+       struct crypto_shash **ctx = crypto_ahash_ctx(hash);
+       struct crypto_shash *shash;
+
+       shash = crypto_clone_shash(*ctx);
+       if (IS_ERR(shash)) {
+               crypto_free_ahash(nhash);
+               return ERR_CAST(shash);
+       }
+
+       *nctx = shash;
+
+       return nhash;
+}
+
 static void crypto_shash_exit_tfm(struct crypto_tfm *tfm)
 {
        struct crypto_shash *hash = __crypto_shash_cast(tfm);
@@ -564,6 +582,40 @@ int crypto_has_shash(const char *alg_name, u32 type, u32 mask)
 }
 EXPORT_SYMBOL_GPL(crypto_has_shash);
 
+struct crypto_shash *crypto_clone_shash(struct crypto_shash *hash)
+{
+       struct crypto_tfm *tfm = crypto_shash_tfm(hash);
+       struct shash_alg *alg = crypto_shash_alg(hash);
+       struct crypto_shash *nhash;
+       int err;
+
+       if (!crypto_shash_alg_has_setkey(alg)) {
+               tfm = crypto_tfm_get(tfm);
+               if (IS_ERR(tfm))
+                       return ERR_CAST(tfm);
+
+               return hash;
+       }
+
+       if (!alg->clone_tfm)
+               return ERR_PTR(-ENOSYS);
+
+       nhash = crypto_clone_tfm(&crypto_shash_type, tfm);
+       if (IS_ERR(nhash))
+               return nhash;
+
+       nhash->descsize = hash->descsize;
+
+       err = alg->clone_tfm(nhash, hash);
+       if (err) {
+               crypto_free_shash(nhash);
+               return ERR_PTR(err);
+       }
+
+       return nhash;
+}
+EXPORT_SYMBOL_GPL(crypto_clone_shash);
+
 int hash_prepare_alg(struct hash_alg_common *alg)
 {
        struct crypto_istat_hash *istat = hash_get_stat(alg);