crypto: add GHASH implementation.

crypto/crypto.gyp

 # Copyright (c) 2012 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.
 
 {
   'variables': {
     'chromium_code': 1,
     # Put all transitive dependencies for Windows HMAC here.
     # This is required so that we can build them for nacl win64.
     'hmac_win64_related_sources': [
@@ skipping 164 matching lines @@
         '<@(hmac_win64_related_sources)',
         'apple_keychain.h',
         'apple_keychain_ios.mm',
         'apple_keychain_mac.mm',
         'capi_util.cc',
         'capi_util.h',
         'crypto_export.h',
         'crypto_module_blocking_password_delegate.h',
         'cssm_init.cc',
         'cssm_init.h',
+        'ghash.cc',
+        'ghash.h',
         'ec_private_key.h',
         'ec_private_key_nss.cc',
         'ec_private_key_openssl.cc',
         'ec_signature_creator.cc',
         'ec_signature_creator.h',
         'ec_signature_creator_impl.h',
         'ec_signature_creator_nss.cc',
         'ec_signature_creator_openssl.cc',
         'encryptor.cc',
         'encryptor.h',
@@ skipping 55 matching lines @@
       'target_name': 'crypto_unittests',
       'type': 'executable',
       'sources': [
         # Infrastructure files.
         'run_all_unittests.cc',
 
         # Tests.
         'ec_private_key_unittest.cc',
         'ec_signature_creator_unittest.cc',
         'encryptor_unittest.cc',
+        'ghash_unittest.cc',
         'hmac_unittest.cc',
         'nss_util_unittest.cc',
         'p224_unittest.cc',
         'p224_spake_unittest.cc',
         'random_unittest.cc',
         'rsa_private_key_unittest.cc',
         'rsa_private_key_nss_unittest.cc',
         'secure_hash_unittest.cc',
         'sha2_unittest.cc',
         'signature_creator_unittest.cc',
@@ skipping 82 matching lines @@
           'configurations': {
             'Common_Base': {
               'msvs_target_platform': 'x64',
             },
           },
         },
       ],
     }],
   ],
 }