Add constant-time comparison operators for cryptographic uses.

crypto/crypto.gyp

 # Copyright (c) 2011 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,
   },
   'targets': [
     {
@@ skipping 131 matching lines @@
         'rsa_private_key.h',
         'rsa_private_key_mac.cc',
         'rsa_private_key_nss.cc',
         'rsa_private_key_openssl.cc',
         'rsa_private_key_win.cc',
         'scoped_capi_types.h',
         'scoped_nss_types.h',
         'secure_hash.h',
         'secure_hash_default.cc',
         'secure_hash_openssl.cc',
+        'secure_util.cc',
+        'secure_util.h',
         'sha2.cc',
         'sha2.h',
         'signature_creator.h',
         'signature_creator_mac.cc',
         'signature_creator_nss.cc',
         'signature_creator_openssl.cc',
         'signature_creator_win.cc',
         'signature_verifier.h',
         'signature_verifier_mac.cc',
         'signature_verifier_nss.cc',
@@ skipping 63 matching lines @@
         [ 'use_openssl==1', {
           'sources!': [
             'openpgp_symmetric_encryption_unittest.cc',
             'rsa_private_key_nss_unittest.cc',
           ],
         }],
       ],
     },
   ],
 }