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112 lines
2.9 KiB
C++
112 lines
2.9 KiB
C++
//
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// RSADigestEngine.h
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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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// SPDX-License-Identifier: BSL-1.0
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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/Crypto/DigestEngine.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::Crypto::DigestEngine is created and
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/// used to compute a cryptographic hash of the data to be
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/// signed. Then, the hash value is encrypted, using
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/// 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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//@ deprecated
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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 MD5 or SHA-1 hash algorithm.
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/// Kept for backward compatibility
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RSADigestEngine(const RSAKey& key, const std::string &name);
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/// Creates the RSADigestEngine with the given RSA key,
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/// using the hash algorithm with the given name
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/// (e.g., "MD5", "SHA1", "SHA256", "SHA512", etc.).
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/// See the OpenSSL documentation for a list of supported digest algorithms.
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///
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/// Throws a Poco::NotFoundException if no algorithm with the given name exists.
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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 (the 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::Crypto::DigestEngine _engine;
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Poco::DigestEngine::Digest _digest;
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Poco::DigestEngine::Digest _signature;
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};
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} } // namespace Poco::Crypto
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#endif // Crypto_RSADigestEngine_INCLUDED
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