[webcrypto] Support 256-bit AES-GCM for OpenSSL implementation.

content/child/webcrypto/shared_crypto_unittest.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 <algorithm>
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/file_util.h"
@@ skipping 3268 matching lines @@
     const std::vector<uint8_t> test_additional_data =
         GetBytesFromHexString(test, "additional_data");
     const std::vector<uint8_t> test_plain_text =
         GetBytesFromHexString(test, "plain_text");
     const std::vector<uint8_t> test_authentication_tag =
         GetBytesFromHexString(test, "authentication_tag");
     const unsigned int test_tag_size_bits = test_authentication_tag.size() * 8;
     const std::vector<uint8_t> test_cipher_text =
         GetBytesFromHexString(test, "cipher_text");
 
-#if defined(USE_OPENSSL)
-    // TODO(eroman): Add support for 256-bit keys.
-    if (test_key.size() == 32) {
-      LOG(WARNING)
-          << "OpenSSL doesn't support 256-bit keys for AES-GCM; skipping";
-      continue;
-    }
-#endif
-
     blink::WebCryptoKey key = ImportSecretKeyFromRaw(
         test_key,
         CreateAlgorithm(blink::WebCryptoAlgorithmIdAesGcm),
         blink::WebCryptoKeyUsageEncrypt | blink::WebCryptoKeyUsageDecrypt);
 
     // Verify exported raw key is identical to the imported data
     std::vector<uint8_t> raw_key;
     EXPECT_EQ(Status::Success(),
               ExportKey(blink::WebCryptoKeyFormatRaw, key, &raw_key));
 
@@ skipping 1111 matching lines @@
   EXPECT_EQ(public_key_spki, unwrapped_public_key_spki);
   EXPECT_EQ(private_key_pkcs8, unwrapped_private_key_pkcs8);
 
   EXPECT_NE(public_key_spki, wrapped_public_key);
   EXPECT_NE(private_key_pkcs8, wrapped_private_key);
 }
 
 }  // namespace webcrypto
 
 }  // namespace content