Componentize component_updater: Split crx_file code off into its own component.

components/crx_file/constants.h

+// 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.
+
+#ifndef COMPONENTS_CRX_FILE_CONSTANTS_H_
+#define COMPONENTS_CRX_FILE_CONSTANTS_H_
+
+#include "base/basictypes.h"
+
+namespace crx_file {
+
+// Note: this structure is an ASN.1 which encodes the algorithm used
+// with its parameters. This is defined in PKCS #1 v2.1 (RFC 3447).
+// It is encoding: { OID sha1WithRSAEncryption      PARAMETERS NULL }
+const uint8 kSignatureAlgorithm[15] = {0x30, 0x0d, 0x06, 0x09, 0x2a,
+                                       0x86, 0x48, 0x86, 0xf7, 0x0d,
+                                       0x01, 0x01, 0x05, 0x05, 0x00};
+
+}  // namespace crx_file
+
+#endif  // COMPONENTS_CRX_FILE_CONSTANTS_H_