crypto: shash - Export async functions

This patch exports the async functions so that they can be reused
by cryptd when it switches over to using shash.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

2 files changed, 25 insertions, 20 deletions

diff --git a/crypto/shash.c b/crypto/shash.c
index d8e0f8f8d672..3b1b06b3dcf3 100644
--- a/crypto/shash.c
+++ b/crypto/shash.c
@@ -202,9 +202,8 @@ static int shash_async_init(struct ahash_request *req)
         return crypto_shash_init(desc);
 }
 
-static int shash_async_update(struct ahash_request *req)
+int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc)
 {
-        struct shash_desc *desc = ahash_request_ctx(req);
         struct crypto_hash_walk walk;
         int nbytes;
 
@@ -214,13 +213,19 @@ static int shash_async_update(struct ahash_request *req)
 
         return nbytes;
 }
+EXPORT_SYMBOL_GPL(shash_ahash_update);
+
+static int shash_async_update(struct ahash_request *req)
+{
+        return shash_ahash_update(req, ahash_request_ctx(req));
+}
 
 static int shash_async_final(struct ahash_request *req)
 {
         return crypto_shash_final(ahash_request_ctx(req), req->result);
 }
 
-static int shash_async_digest(struct ahash_request *req)
+int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc)
 {
         struct scatterlist *sg = req->src;
         unsigned int offset = sg->offset;
@@ -228,34 +233,31 @@ static int shash_async_digest(struct ahash_request *req)
         int err;
 
         if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
-                struct crypto_shash **ctx =
-                        crypto_ahash_ctx(crypto_ahash_reqtfm(req));
-                struct shash_desc *desc = ahash_request_ctx(req);
                 void *data;
 
-                desc->tfm = *ctx;
-                desc->flags = req->base.flags;
-
                 data = crypto_kmap(sg_page(sg), 0);
                 err = crypto_shash_digest(desc, data + offset, nbytes,
                                           req->result);
                 crypto_kunmap(data, 0);
                 crypto_yield(desc->flags);
-                goto out;
-        }
+        } else
+                err = crypto_shash_init(desc) ?:
+                      shash_ahash_update(req, desc) ?:
+                      crypto_shash_final(desc, req->result);
 
-        err = shash_async_init(req);
-        if (err)
-                goto out;
+        return err;
+}
+EXPORT_SYMBOL_GPL(shash_ahash_digest);
 
-        err = shash_async_update(req);
-        if (err)
-                goto out;
+static int shash_async_digest(struct ahash_request *req)
+{
+        struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
+        struct shash_desc *desc = ahash_request_ctx(req);
 
-        err = shash_async_final(req);
+        desc->tfm = *ctx;
+        desc->flags = req->base.flags;
 
-out:
-        return err;
+        return shash_ahash_digest(req, desc);
 }
 
 static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
diff --git a/include/crypto/internal/hash.h b/include/crypto/internal/hash.h
index 2d1b10f23c91..6e283495374e 100644
--- a/include/crypto/internal/hash.h
+++ b/include/crypto/internal/hash.h
@@ -63,6 +63,9 @@ int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn,
 
 struct shash_alg *shash_attr_alg(struct rtattr *rta, u32 type, u32 mask);
 
+int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc);
+int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc);
+
 static inline void *crypto_ahash_ctx(struct crypto_ahash *tfm)
 {
         return crypto_tfm_ctx(&tfm->base);