Major plugin refactor and cleanup.

Switched to POCO library for unified platform/library interface.
Deprecated the external module API. It was creating more problems than solving.
Removed most built-in libraries in favor of system libraries for easier maintenance.
Cleaned and secured code with help from static analyzers.

vendor/POCO/Crypto/include/Poco/Crypto/KeyPair.h

@@ -0,0 +1,144 @@
+//
+// KeyPair.h
+//
+// Library: Crypto
+// Package: CryptoCore
+// Module:  KeyPair
+//
+// Definition of the KeyPair class.
+//
+// Copyright (c) 2008, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Crypto_KeyPair_INCLUDED
+#define Crypto_KeyPair_INCLUDED
+
+
+#include "Poco/Crypto/Crypto.h"
+#include "Poco/Crypto/KeyPairImpl.h"
+
+
+namespace Poco {
+namespace Crypto {
+
+
+class X509Certificate;
+
+
+class Crypto_API KeyPair
+	/// This is a parent class for classes storing a key pair, consisting
+	/// of private and public key. Storage of the private key is optional.
+	///
+	/// If a private key is available, the KeyPair can be
+	/// used for decrypting data (encrypted with the public key)
+	/// or computing secure digital signatures.
+{
+public:
+	enum Type
+	{
+		KT_RSA = KeyPairImpl::KT_RSA_IMPL,
+		KT_EC = KeyPairImpl::KT_EC_IMPL
+	};
+
+	explicit KeyPair(KeyPairImpl::Ptr pKeyPairImpl = 0);
+		/// Extracts the RSA public key from the given certificate.
+
+	KeyPair(const KeyPair& other);
+		/// Copy constructor.
+
+	KeyPair(KeyPair&& other) noexcept;
+		/// Move constructor.
+
+	KeyPair& operator = (const KeyPair& other);
+		/// Assignment.
+
+	KeyPair& operator = (KeyPair&& other) noexcept;
+		/// Move assignment.
+
+	virtual ~KeyPair();
+		/// Destroys the KeyPair.
+
+	virtual int size() const;
+		/// Returns the RSA modulus size.
+
+	virtual void save(const std::string& publicKeyPairFile,
+		const std::string& privateKeyPairFile = "",
+		const std::string& privateKeyPairPassphrase = "") const;
+		/// Exports the public and private keys to the given files.
+		///
+		/// If an empty filename is specified, the corresponding key
+		/// is not exported.
+
+	virtual void save(std::ostream* pPublicKeyPairStream,
+		std::ostream* pPrivateKeyPairStream = 0,
+		const std::string& privateKeyPairPassphrase = "") const;
+		/// Exports the public and private key to the given streams.
+		///
+		/// If a null pointer is passed for a stream, the corresponding
+		/// key is not exported.
+
+	KeyPairImpl::Ptr impl() const;
+		/// Returns the impl object.
+
+	const std::string& name() const;
+		/// Returns key pair name
+
+	Type type() const;
+		/// Returns key pair type
+
+private:
+	KeyPairImpl::Ptr _pImpl;
+};
+
+
+//
+// inlines
+//
+inline int KeyPair::size() const
+{
+	return _pImpl->size();
+}
+
+
+inline void KeyPair::save(const std::string& publicKeyFile,
+	const std::string& privateKeyFile,
+	const std::string& privateKeyPassphrase) const
+{
+	_pImpl->save(publicKeyFile, privateKeyFile, privateKeyPassphrase);
+}
+
+
+inline void KeyPair::save(std::ostream* pPublicKeyStream,
+	std::ostream* pPrivateKeyStream,
+	const std::string& privateKeyPassphrase) const
+{
+	_pImpl->save(pPublicKeyStream, pPrivateKeyStream, privateKeyPassphrase);
+}
+
+
+inline const std::string& KeyPair::name() const
+{
+	return _pImpl->name();
+}
+
+
+inline KeyPairImpl::Ptr KeyPair::impl() const
+{
+	return _pImpl;
+}
+
+
+inline KeyPair::Type KeyPair::type() const
+{
+	return (KeyPair::Type)impl()->type();
+}
+
+
+} } // namespace Poco::Crypto
+
+
+#endif // Crypto_KeyPair_INCLUDED