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129 lines
3.7 KiB
C++
129 lines
3.7 KiB
C++
//
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// DigestEngine.h
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//
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// $Id: //poco/1.4/Foundation/include/Poco/DigestEngine.h#1 $
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//
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// Library: Foundation
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// Package: Crypt
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// Module: DigestEngine
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//
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// Definition of class DigestEngine.
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//
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// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// Permission is hereby granted, free of charge, to any person or organization
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// obtaining a copy of the software and accompanying documentation covered by
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// this license (the "Software") to use, reproduce, display, distribute,
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// execute, and transmit the Software, and to prepare derivative works of the
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// Software, and to permit third-parties to whom the Software is furnished to
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// do so, all subject to the following:
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//
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// The copyright notices in the Software and this entire statement, including
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// the above license grant, this restriction and the following disclaimer,
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// must be included in all copies of the Software, in whole or in part, and
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// all derivative works of the Software, unless such copies or derivative
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// works are solely in the form of machine-executable object code generated by
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// a source language processor.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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//
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#ifndef Foundation_DigestEngine_INCLUDED
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#define Foundation_DigestEngine_INCLUDED
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#include "Poco/Foundation.h"
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#include <vector>
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namespace Poco {
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class Foundation_API DigestEngine
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/// This class is an abstract base class
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/// for all classes implementing a message
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/// digest algorithm, like MD5Engine
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/// and SHA1Engine.
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/// Call update() repeatedly with data to
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/// compute the digest from. When done,
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/// call digest() to obtain the message
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/// digest.
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{
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public:
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typedef std::vector<unsigned char> Digest;
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DigestEngine();
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virtual ~DigestEngine();
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void update(const void* data, std::size_t length);
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void update(char data);
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void update(const std::string& data);
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/// Updates the digest with the given data.
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virtual std::size_t digestLength() const = 0;
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/// Returns the length of the digest in bytes.
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virtual void reset() = 0;
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/// Resets the engine so that a new
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/// digest can be computed.
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virtual const Digest& digest() = 0;
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/// Finishes the computation of the digest and
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/// returns the message digest. Resets the engine
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/// and can thus only be called once for every digest.
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/// The returned reference is valid until the next
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/// time digest() is called, or the engine object is destroyed.
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static std::string digestToHex(const Digest& bytes);
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/// Converts a message digest into a string of hexadecimal numbers.
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static Digest digestFromHex(const std::string& digest);
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/// Converts a string created by digestToHex back to its Digest presentation
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protected:
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virtual void updateImpl(const void* data, std::size_t length) = 0;
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/// Updates the digest with the given data. Must be implemented
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/// by subclasses.
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private:
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DigestEngine(const DigestEngine&);
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DigestEngine& operator = (const DigestEngine&);
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};
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//
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// inlines
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//
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inline void DigestEngine::update(const void* data, std::size_t length)
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{
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updateImpl(data, length);
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}
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inline void DigestEngine::update(char data)
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{
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updateImpl(&data, 1);
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}
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inline void DigestEngine::update(const std::string& data)
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{
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updateImpl(data.data(), data.size());
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}
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} // namespace Poco
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#endif // Foundation_DigestEngine_INCLUDED
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