Refactor the interface for generating keys.

content/child/webcrypto/nss/aes_gcm_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 "base/numerics/safe_math.h"
 #include "base/stl_util.h"
 #include "content/child/webcrypto/crypto_data.h"
 #include "content/child/webcrypto/nss/aes_key_nss.h"
 #include "content/child/webcrypto/nss/key_nss.h"
 #include "content/child/webcrypto/nss/util_nss.h"
@@ skipping 135 matching lines @@
   virtual Status VerifyKeyUsagesBeforeImportKey(
       blink::WebCryptoKeyFormat format,
       blink::WebCryptoKeyUsageMask usage_mask) const override {
     // Prevent importing AES-GCM keys if it is unavailable.
     Status status = NssSupportsAesGcm();
     if (status.IsError())
       return status;
     return AesAlgorithm::VerifyKeyUsagesBeforeImportKey(format, usage_mask);
   }
 
-  virtual Status VerifyKeyUsagesBeforeGenerateKey(
-      blink::WebCryptoKeyUsageMask usage_mask) const override {
+  virtual Status GenerateKey(const blink::WebCryptoAlgorithm& algorithm,
+                             bool extractable,
+                             blink::WebCryptoKeyUsageMask usage_mask,
+                             GenerateKeyResult* result) const override {
     // Prevent generating AES-GCM keys if it is unavailable.
     Status status = NssSupportsAesGcm();
     if (status.IsError())
       return status;
-    return AesAlgorithm::VerifyKeyUsagesBeforeGenerateKey(usage_mask);
+
+    return AesAlgorithm::GenerateKey(
+        algorithm, extractable, usage_mask, result);
   }
 
   virtual Status Encrypt(const blink::WebCryptoAlgorithm& algorithm,
                          const blink::WebCryptoKey& key,
                          const CryptoData& data,
                          std::vector<uint8_t>* buffer) const override {
     return AesGcmEncryptDecrypt(ENCRYPT, algorithm, key, data, buffer);
   }
 
   virtual Status Decrypt(const blink::WebCryptoAlgorithm& algorithm,
                          const blink::WebCryptoKey& key,
                          const CryptoData& data,
                          std::vector<uint8_t>* buffer) const override {
     return AesGcmEncryptDecrypt(DECRYPT, algorithm, key, data, buffer);
   }
 };
 
 }  // namespace
 
 AlgorithmImplementation* CreatePlatformAesGcmImplementation() {
   return new AesGcmImplementation;
 }
 
 }  // namespace webcrypto
 
 }  // namespace content