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129 lines
3.9 KiB
C++
129 lines
3.9 KiB
C++
//
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// RSADigestEngine.h
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//
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// $Id: //poco/1.4/Crypto/include/Poco/Crypto/RSADigestEngine.h#1 $
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//
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// Library: Crypto
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// Package: RSA
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// Module: RSADigestEngine
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//
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// Definition of the RSADigestEngine class.
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//
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// Copyright (c) 2008, 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 Crypto_RSADigestEngine_INCLUDED
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#define Crypto_RSADigestEngine_INCLUDED
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#include "Poco/Crypto/Crypto.h"
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#include "Poco/Crypto/RSAKey.h"
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#include "Poco/DigestEngine.h"
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#include "Poco/MD5Engine.h"
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#include "Poco/SHA1Engine.h"
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#include <openssl/rsa.h>
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#include <istream>
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#include <ostream>
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namespace Poco {
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namespace Crypto {
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class Crypto_API RSADigestEngine: public Poco::DigestEngine
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/// This class implements a Poco::DigestEngine that can be
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/// used to compute a secure digital signature.
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///
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/// First another Poco::DigestEngine (Poco::MD5Engine
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/// or Poco::SHA1Engine) is used to compute a cryptographic
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/// hash of the data to be signed. Then, the hash value is
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/// encrypted, using the RSA private key.
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///
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/// To verify a signature, pass it to the verify()
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/// member function. It will decrypt the signature
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/// using the RSA public key and compare the resulting
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/// hash with the actual hash of the data.
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{
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public:
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enum DigestType
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{
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DIGEST_MD5,
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DIGEST_SHA1
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};
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RSADigestEngine(const RSAKey& key, DigestType digestType = DIGEST_SHA1);
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/// Creates the RSADigestEngine with the given RSA key,
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/// using the SHA-1 hash algorithm.
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~RSADigestEngine();
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/// Destroys the RSADigestEngine.
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std::size_t digestLength() const;
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/// Returns the length of the digest in bytes.
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void reset();
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/// Resets the engine so that a new
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/// digest can be computed.
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const DigestEngine::Digest& digest();
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/// Finishes the computation of the digest
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/// (the first time it's called) and
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/// returns the message digest.
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///
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/// Can be called multiple times.
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const DigestEngine::Digest& signature();
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/// Signs the digest using the RSA algorithm
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/// and the private key (teh first time it's
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/// called) and returns the result.
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///
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/// Can be called multiple times.
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bool verify(const DigestEngine::Digest& signature);
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/// Verifies the data against the signature.
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///
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/// Returns true if the signature can be verified, false otherwise.
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protected:
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void updateImpl(const void* data, std::size_t length);
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private:
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RSAKey _key;
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Poco::DigestEngine& _engine;
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int _type;
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Poco::DigestEngine::Digest _digest;
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Poco::DigestEngine::Digest _signature;
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Poco::MD5Engine _md5Engine;
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Poco::SHA1Engine _sha1Engine;
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};
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} } // namespace Poco::Crypto
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#endif // Crypto_RSADigestEngine_INCLUDED
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