[CRYPTO] hash: Add asynchronous hash support

[safe/jmp/linux-2.6] / crypto / digest.c

diff --git a/crypto/digest.c b/crypto/digest.c
index b526cc3..025c9ae 100644 (file)
--- a/crypto/digest.c
+++ b/crypto/digest.c
@@ -157,3 +157,84 @@ int crypto_init_digest_ops(struct crypto_tfm *tfm)
 void crypto_exit_digest_ops(struct crypto_tfm *tfm)
 {
 }
+
+static int digest_async_nosetkey(struct crypto_ahash *tfm_async, const u8 *key,
+                       unsigned int keylen)
+{
+       crypto_ahash_clear_flags(tfm_async, CRYPTO_TFM_RES_MASK);
+       return -ENOSYS;
+}
+
+static int digest_async_setkey(struct crypto_ahash *tfm_async, const u8 *key,
+                       unsigned int keylen)
+{
+       struct crypto_tfm    *tfm        = crypto_ahash_tfm(tfm_async);
+       struct digest_alg    *dalg       = &tfm->__crt_alg->cra_digest;
+
+       crypto_ahash_clear_flags(tfm_async, CRYPTO_TFM_RES_MASK);
+       return dalg->dia_setkey(tfm, key, keylen);
+}
+
+static int digest_async_init(struct ahash_request *req)
+{
+       struct crypto_tfm *tfm  = req->base.tfm;
+       struct digest_alg *dalg = &tfm->__crt_alg->cra_digest;
+
+       dalg->dia_init(tfm);
+       return 0;
+}
+
+static int digest_async_update(struct ahash_request *req)
+{
+       struct crypto_tfm *tfm = req->base.tfm;
+       struct hash_desc  desc = {
+               .tfm   = __crypto_hash_cast(tfm),
+               .flags = req->base.flags,
+       };
+
+       update(&desc, req->src, req->nbytes);
+       return 0;
+}
+
+static int digest_async_final(struct ahash_request *req)
+{
+       struct crypto_tfm *tfm  = req->base.tfm;
+       struct hash_desc  desc = {
+               .tfm   = __crypto_hash_cast(tfm),
+               .flags = req->base.flags,
+       };
+
+       final(&desc, req->result);
+       return 0;
+}
+
+static int digest_async_digest(struct ahash_request *req)
+{
+       struct crypto_tfm *tfm  = req->base.tfm;
+       struct hash_desc  desc = {
+               .tfm   = __crypto_hash_cast(tfm),
+               .flags = req->base.flags,
+       };
+
+       return digest(&desc, req->src, req->nbytes, req->result);
+}
+
+int crypto_init_digest_ops_async(struct crypto_tfm *tfm)
+{
+       struct ahash_tfm  *crt  = &tfm->crt_ahash;
+       struct digest_alg *dalg = &tfm->__crt_alg->cra_digest;
+
+       if (dalg->dia_digestsize > crypto_tfm_alg_blocksize(tfm))
+               return -EINVAL;
+
+       crt->init       = digest_async_init;
+       crt->update     = digest_async_update;
+       crt->final      = digest_async_final;
+       crt->digest     = digest_async_digest;
+       crt->setkey     = dalg->dia_setkey ? digest_async_setkey :
+                                               digest_async_nosetkey;
+       crt->digestsize = dalg->dia_digestsize;
+       crt->base       = __crypto_ahash_cast(tfm);
+
+       return 0;
+}