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diff --git a/cpp/src/polo/util/poloutil.h b/cpp/src/polo/util/poloutil.h
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+// Copyright 2012 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef POLO_UTIL_POLOUTIL_H_
+#define POLO_UTIL_POLOUTIL_H_
+
+#include <openssl/ssl.h>
+#include <stdint.h>
+#include <string>
+#include <vector>
+
+namespace polo {
+namespace util {
+
+// Utilites used for the Polo protocol.
+class PoloUtil {
+ public:
+  // Converts an array of big-endian bytes to a hex string.
+  // @param bytes an array of big-endian bytes
+  // @param length the length of the given byte array
+  // @return a hex string representing the given byte array
+  static const std::string BytesToHexString(const uint8_t* bytes,
+                                            size_t length);
+
+  // Converts a hex string to an array of big-endian bytes. A new byte array
+  // is created at the given bytes pointer, and the number of bytes is returned.
+  // The byte array must be freed using: delete[] bytes.
+  // @param hex_string the hex string to convert
+  // @param bytes pointer to a byte array that will be created with the
+  //              big-endian result
+  // @return the number of bytes in the resulting byte array
+  static const size_t HexStringToBytes(const std::string hex_string,
+                                       uint8_t*& bytes);
+
+  // Converts an integer value to a big-endian array of bytes. A new byte array
+  // is created at the given bytes pointer. There are always 4 bytes in the
+  // array. The byte array must be freed using: delete[] bytes.
+  // @param value the integer value to convert
+  // @param bytes pointer to a byte array that will be created with the 4-byte
+  //              big-endian array
+  static const void IntToBigEndianBytes(uint32_t value,
+                                        uint8_t*& bytes);
+
+  // Converts a big-endian array of bytes to an unsigned-integer. The given byte
+  // array must contain 4 bytes.
+  // @param bytes a big-endian array of bytes
+  // @return the unsigned integer representation of the given byte array
+  static const uint32_t BigEndianBytesToInt(const uint8_t* bytes);
+
+  // Generates a random array of bytes with the given length. NULL is returned
+  // if a random number could not be generated. The returned array must be freed
+  // using: delete[] bytes.
+  // @param length the number of random bytes to generate
+  // @return an array of random bytes of the given length
+  static uint8_t* GenerateRandomBytes(size_t length);
+};
+
+}  // namespace util
+}  // namespace polo
+
+#endif  // POLO_UTIL_POLOUTIL_H_