[CRYPTO] hash: Add asynchronous hash support

This patch adds asynchronous hash and digest support.

Signed-off-by: Loc Ho <lho@amcc.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 93 insertions, 9 deletions

diff --git a/crypto/hash.c b/crypto/hash.c
index 7dcff671c19b..f9400a014e74 100644
--- a/crypto/hash.c
+++ b/crypto/hash.c
@@ -59,24 +59,108 @@ static int hash_setkey(struct crypto_hash *crt, const u8 *key,
         return alg->setkey(crt, key, keylen);
 }
 
-static int crypto_init_hash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
+static int hash_async_setkey(struct crypto_ahash *tfm_async, const u8 *key,
+                        unsigned int keylen)
+{
+        struct crypto_tfm  *tfm      = crypto_ahash_tfm(tfm_async);
+        struct crypto_hash *tfm_hash = __crypto_hash_cast(tfm);
+        struct hash_alg    *alg      = &tfm->__crt_alg->cra_hash;
+
+        return alg->setkey(tfm_hash, key, keylen);
+}
+
+static int hash_async_init(struct ahash_request *req)
+{
+        struct crypto_tfm *tfm = req->base.tfm;
+        struct hash_alg   *alg = &tfm->__crt_alg->cra_hash;
+        struct hash_desc  desc = {
+                .tfm = __crypto_hash_cast(tfm),
+                .flags = req->base.flags,
+        };
+
+        return alg->init(&desc);
+}
+
+static int hash_async_update(struct ahash_request *req)
+{
+        struct crypto_tfm *tfm = req->base.tfm;
+        struct hash_alg   *alg = &tfm->__crt_alg->cra_hash;
+        struct hash_desc  desc = {
+                .tfm = __crypto_hash_cast(tfm),
+                .flags = req->base.flags,
+        };
+
+        return alg->update(&desc, req->src, req->nbytes);
+}
+
+static int hash_async_final(struct ahash_request *req)
+{
+        struct crypto_tfm *tfm = req->base.tfm;
+        struct hash_alg   *alg = &tfm->__crt_alg->cra_hash;
+        struct hash_desc  desc = {
+                .tfm = __crypto_hash_cast(tfm),
+                .flags = req->base.flags,
+        };
+
+        return alg->final(&desc, req->result);
+}
+
+static int hash_async_digest(struct ahash_request *req)
+{
+        struct crypto_tfm *tfm = req->base.tfm;
+        struct hash_alg   *alg = &tfm->__crt_alg->cra_hash;
+        struct hash_desc  desc = {
+                .tfm = __crypto_hash_cast(tfm),
+                .flags = req->base.flags,
+        };
+
+        return alg->digest(&desc, req->src, req->nbytes, req->result);
+}
+
+static int crypto_init_hash_ops_async(struct crypto_tfm *tfm)
+{
+        struct ahash_tfm *crt = &tfm->crt_ahash;
+        struct hash_alg  *alg = &tfm->__crt_alg->cra_hash;
+
+        crt->init       = hash_async_init;
+        crt->update     = hash_async_update;
+        crt->final      = hash_async_final;
+        crt->digest     = hash_async_digest;
+        crt->setkey     = hash_async_setkey;
+        crt->digestsize = alg->digestsize;
+        crt->base       = __crypto_ahash_cast(tfm);
+
+        return 0;
+}
+
+static int crypto_init_hash_ops_sync(struct crypto_tfm *tfm)
 {
         struct hash_tfm *crt = &tfm->crt_hash;
         struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
 
-        if (alg->digestsize > crypto_tfm_alg_blocksize(tfm))
-                return -EINVAL;
-
-        crt->init = alg->init;
-        crt->update = alg->update;
-        crt->final = alg->final;
-        crt->digest = alg->digest;
-        crt->setkey = hash_setkey;
+        crt->init       = alg->init;
+        crt->update     = alg->update;
+        crt->final      = alg->final;
+        crt->digest     = alg->digest;
+        crt->setkey     = hash_setkey;
         crt->digestsize = alg->digestsize;
 
         return 0;
 }
 
+static int crypto_init_hash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
+{
+        struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
+
+        if (alg->digestsize > crypto_tfm_alg_blocksize(tfm))
+                return -EINVAL;
+
+        if ((mask & CRYPTO_ALG_TYPE_HASH_MASK) != CRYPTO_ALG_TYPE_HASH_MASK)
+                return crypto_init_hash_ops_async(tfm);
+        else
+                return crypto_init_hash_ops_sync(tfm);
+}
+
 static void crypto_hash_show(struct seq_file *m, struct crypto_alg *alg)
         __attribute__ ((unused));
 static void crypto_hash_show(struct seq_file *m, struct crypto_alg *alg)