pktcdvd: improve BKL and compat_ioctl.c usage
[linux-2.6.git] / crypto / shash.c
index 834d9d2..91f7b9d 100644 (file)
@@ -183,14 +183,16 @@ int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
 }
 EXPORT_SYMBOL_GPL(crypto_shash_digest);
 
-static int shash_no_export(struct shash_desc *desc, void *out)
+static int shash_default_export(struct shash_desc *desc, void *out)
 {
-       return -ENOSYS;
+       memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm));
+       return 0;
 }
 
-static int shash_no_import(struct shash_desc *desc, const void *in)
+static int shash_default_import(struct shash_desc *desc, const void *in)
 {
-       return -ENOSYS;
+       memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(desc->tfm));
+       return 0;
 }
 
 static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
@@ -240,12 +242,17 @@ int shash_ahash_finup(struct ahash_request *req, struct shash_desc *desc)
        struct crypto_hash_walk walk;
        int nbytes;
 
-       for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
-            nbytes = crypto_hash_walk_done(&walk, nbytes))
+       nbytes = crypto_hash_walk_first(req, &walk);
+       if (!nbytes)
+               return crypto_shash_final(desc, req->result);
+
+       do {
                nbytes = crypto_hash_walk_last(&walk) ?
                         crypto_shash_finup(desc, walk.data, nbytes,
                                            req->result) :
                         crypto_shash_update(desc, walk.data, nbytes);
+               nbytes = crypto_hash_walk_done(&walk, nbytes);
+       } while (nbytes > 0);
 
        return nbytes;
 }
@@ -343,7 +350,7 @@ int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
                crt->setkey = shash_async_setkey;
        if (alg->export)
                crt->export = shash_async_export;
-       if (alg->setkey)
+       if (alg->import)
                crt->import = shash_async_import;
 
        crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
@@ -558,10 +565,11 @@ static int shash_prepare_alg(struct shash_alg *alg)
                alg->finup = shash_finup_unaligned;
        if (!alg->digest)
                alg->digest = shash_digest_unaligned;
-       if (!alg->import)
-               alg->import = shash_no_import;
-       if (!alg->export)
-               alg->export = shash_no_export;
+       if (!alg->export) {
+               alg->export = shash_default_export;
+               alg->import = shash_default_import;
+               alg->statesize = alg->descsize;
+       }
        if (!alg->setkey)
                alg->setkey = shash_no_setkey;