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diff --git a/Source/cmCryptoHash.h b/Source/cmCryptoHash.h
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+/*============================================================================
+  CMake - Cross Platform Makefile Generator
+  Copyright 2000-2009 Kitware, Inc., Insight Software Consortium
+
+  Distributed under the OSI-approved BSD License (the "License");
+  see accompanying file Copyright.txt for details.
+
+  This software is distributed WITHOUT ANY WARRANTY; without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the License for more information.
+============================================================================*/
+#ifndef cmCryptoHash_h
+#define cmCryptoHash_h
+
+#include "cmStandardIncludes.h"
+
+#include <cm_auto_ptr.hxx>
+
+/**
+ * @brief Abstract base class for cryptographic hash generators
+ */
+class cmCryptoHash
+{
+public:
+  virtual ~cmCryptoHash() {}
+
+  /// @brief Returns a new hash generator of the requested type
+  /// @arg algo Hash type name. Supported hash types are
+  ///      MD5, SHA1, SHA224, SHA256, SHA384, SHA512
+  /// @return A valid auto pointer if algo is supported or
+  ///         an invalid/NULL pointer otherwise
+  static CM_AUTO_PTR<cmCryptoHash> New(const char* algo);
+
+  /// @brief Converts a hex character to its binary value (4 bits)
+  /// @arg input Hex character [0-9a-fA-F].
+  /// @arg output Binary value of the input character (4 bits)
+  /// @return True if input was a valid hex character
+  static bool IntFromHexDigit(char input, char& output);
+
+  /// @brief Converts a byte hash to a sequence of hex character pairs
+  static std::string ByteHashToString(const std::vector<unsigned char>& hash);
+
+  /// @brief Calculates a binary hash from string input data
+  /// @return Binary hash vector
+  std::vector<unsigned char> ByteHashString(const std::string& input);
+
+  /// @brief Calculates a binary hash from file content
+  /// @see ByteHashString()
+  /// @return Non empty binary hash vector if the file was read successfully.
+  ///         An empty vector otherwise.
+  std::vector<unsigned char> ByteHashFile(const std::string& file);
+
+  /// @brief Calculates a hash string from string input data
+  /// @return Sequence of hex characters pairs for each byte of the binary hash
+  std::string HashString(const std::string& input);
+
+  /// @brief Calculates a hash string from file content
+  /// @see HashString()
+  /// @return Non empty hash string if the file was read successfully.
+  ///         An empty string otherwise.
+  std::string HashFile(const std::string& file);
+
+protected:
+  virtual void Initialize() = 0;
+  virtual void Append(unsigned char const*, int) = 0;
+  virtual std::vector<unsigned char> Finalize() = 0;
+};
+
+class cmCryptoHashMD5 : public cmCryptoHash
+{
+  struct cmsysMD5_s* MD5;
+
+public:
+  cmCryptoHashMD5();
+  ~cmCryptoHashMD5() CM_OVERRIDE;
+
+protected:
+  void Initialize() CM_OVERRIDE;
+  void Append(unsigned char const* buf, int sz) CM_OVERRIDE;
+  std::vector<unsigned char> Finalize() CM_OVERRIDE;
+};
+
+#define cmCryptoHash_SHA_CLASS_DECL(SHA)                                      \
+  class cmCryptoHash##SHA : public cmCryptoHash                               \
+  {                                                                           \
+    union _SHA_CTX* SHA;                                                      \
+                                                                              \
+  public:                                                                     \
+    cmCryptoHash##SHA();                                                      \
+    ~cmCryptoHash##SHA();                                                     \
+                                                                              \
+  protected:                                                                  \
+    virtual void Initialize();                                                \
+    virtual void Append(unsigned char const* buf, int sz);                    \
+    virtual std::vector<unsigned char> Finalize();                            \
+  }
+
+cmCryptoHash_SHA_CLASS_DECL(SHA1);
+cmCryptoHash_SHA_CLASS_DECL(SHA224);
+cmCryptoHash_SHA_CLASS_DECL(SHA256);
+cmCryptoHash_SHA_CLASS_DECL(SHA384);
+cmCryptoHash_SHA_CLASS_DECL(SHA512);
+
+#undef cmCryptoHash_SHA_CLASS_DECL
+
+#endif