/usr/include/Poco/Crypto/RSADigestEngine.h is in libpoco-dev 1.3.6p1-4.
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// RSADigestEngine.h
//
// $Id: //poco/1.3/Crypto/include/Poco/Crypto/RSADigestEngine.h#3 $
//
// Library: Crypto
// Package: RSA
// Module: RSADigestEngine
//
// Definition of the RSADigestEngine class.
//
// Copyright (c) 2008, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
//
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//
#ifndef Crypto_RSADigestEngine_INCLUDED
#define Crypto_RSADigestEngine_INCLUDED
#include "Poco/Crypto/Crypto.h"
#include "Poco/Crypto/RSAKey.h"
#include "Poco/DigestEngine.h"
#include "Poco/MD5Engine.h"
#include "Poco/SHA1Engine.h"
#include <openssl/rsa.h>
#include <istream>
#include <ostream>
namespace Poco {
namespace Crypto {
class Crypto_API RSADigestEngine: public Poco::DigestEngine
/// This class implements a Poco::DigestEngine that can be
/// used to compute a secure digital signature.
///
/// First another Poco::DigestEngine (Poco::MD5Engine
/// or Poco::SHA1Engine) is used to compute a cryptographic
/// hash of the data to be signed. Then, the hash value is
/// encrypted, using the RSA private key.
///
/// To verify a signature, pass it to the verify()
/// member function. It will decrypt the signature
/// using the RSA public key and compare the resulting
/// hash with the actual hash of the data.
{
public:
enum DigestType
{
DIGEST_MD5,
DIGEST_SHA1
};
RSADigestEngine(const RSAKey& key, DigestType digestType = DIGEST_SHA1);
/// Creates the RSADigestEngine with the given RSA key,
/// using the SHA-1 hash algorithm.
~RSADigestEngine();
/// Destroys the RSADigestEngine.
unsigned digestLength() const;
/// Returns the length of the digest in bytes.
void reset();
/// Resets the engine so that a new
/// digest can be computed.
const DigestEngine::Digest& digest();
/// Finishes the computation of the digest
/// (the first time it's called) and
/// returns the message digest.
///
/// Can be called multiple times.
const DigestEngine::Digest& signature();
/// Signs the digest using the RSA algorithm
/// and the private key (teh first time it's
/// called) and returns the result.
///
/// Can be called multiple times.
bool verify(const DigestEngine::Digest& signature);
/// Verifies the data against the signature.
///
/// Returns true if the signature can be verified, false otherwise.
protected:
void updateImpl(const void* data, unsigned length);
private:
RSAKey _key;
Poco::DigestEngine& _engine;
int _type;
Poco::DigestEngine::Digest _digest;
Poco::DigestEngine::Digest _signature;
Poco::MD5Engine _md5Engine;
Poco::SHA1Engine _sha1Engine;
};
} } // namespace Poco::Crypto
#endif // Crypto_RSADigestEngine_INCLUDED
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