Refactor: Extract common code for generating asymmetric keys to a helper.

content/child/webcrypto/nss/rsa_key_nss.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/child/webcrypto/nss/rsa_key_nss.h"
 
 #include <secasn1.h>
 
 #include "base/logging.h"
 #include "content/child/webcrypto/crypto_data.h"
@@ skipping 485 matching lines @@
   return Status::Success();
 }
 
 }  // namespace
 
 Status RsaHashedAlgorithm::GenerateKey(
     const blink::WebCryptoAlgorithm& algorithm,
     bool extractable,
     blink::WebCryptoKeyUsageMask combined_usages,
     GenerateKeyResult* result) const {
-  Status status = CheckKeyCreationUsages(
-      all_public_key_usages_ | all_private_key_usages_, combined_usages);
+  blink::WebCryptoKeyUsageMask public_usages = 0;
+  blink::WebCryptoKeyUsageMask private_usages = 0;
+
+  Status status = GetUsagesForGenerateAsymmetricKey(
+      combined_usages, all_public_key_usages_, all_private_key_usages_,
+      &public_usages, &private_usages);
   if (status.IsError())
     return status;
 
-  const blink::WebCryptoKeyUsageMask public_usages =
-      combined_usages & all_public_key_usages_;
-  const blink::WebCryptoKeyUsageMask private_usages =
-      combined_usages & all_private_key_usages_;
-
-  if (private_usages == 0)
-    return Status::ErrorCreateKeyEmptyUsages();
-
   unsigned int public_exponent = 0;
   unsigned int modulus_length_bits = 0;
   status = GetRsaKeyGenParameters(algorithm.rsaHashedKeyGenParams(),
                                   &public_exponent, &modulus_length_bits);
   if (status.IsError())
     return status;
 
   crypto::ScopedPK11Slot slot(PK11_GetInternalKeySlot());
   if (!slot)
     return Status::OperationError();
@@ skipping 335 matching lines @@
                  key->algorithm().rsaHashedParams()->publicExponent().size())) {
     return Status::ErrorUnexpected();
   }
 
   return Status::Success();
 }
 
 }  // namespace webcrypto
 
 }  // namespace content