Initial commit of sync engine code to browser/sync....

chrome/browser/sync/util/crypto_helpers.h

+// Copyright (c) 2009 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 CHROME_BROWSER_SYNC_UTIL_CRYPTO_HELPERS_H_
+#define CHROME_BROWSER_SYNC_UTIL_CRYPTO_HELPERS_H_
+
+#include <string>
+#include <vector>
+
+// An object to handle calculation of MD5 sums.
+#include "base/basictypes.h"
+#include "base/logging.h"
+#include "base/md5.h"
+#include "base/port.h"
+#include "chrome/browser/sync/util/sync_types.h"
+
+class MD5Calculator {
+ protected:
+  MD5Context context_;
+  std::vector<uint8> bin_digest_;
+
+  void CalcDigest();
+ public:
+  MD5Calculator();
+  ~MD5Calculator() {}
+  void AddData(const uint8* data, int length);
+  void AddData(const char* data, int length) {
+    AddData(reinterpret_cast<const uint8*>(data), length);
+  }
+  PathString GetHexDigest();
+  std::vector<uint8> GetDigest();
+ private:
+  DISALLOW_COPY_AND_ASSIGN(MD5Calculator);
+};
+
+void GetRandomBytes(char* output, int output_length);
+std::string Generate128BitRandomHexString();
+
+#endif  // CHROME_BROWSER_SYNC_UTIL_CRYPTO_HELPERS_H_