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Source/include/slikenet/crypto/fileencrypter.h

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+/*
+ *  Copyright (c) 2018-2019, SLikeSoft UG (haftungsbeschr<68>nkt)
+ *
+ *  This source code is  licensed under the MIT-style license found in the license.txt
+ *  file in the root directory of this source tree.
+ */
+#pragma once
+
+#include "ifileencrypter.h"    // used for Crypto::IFileEncrypter
+#include "securestring.h"      // used for Crypto::CSecureString
+ #include <openssl/ossl_typ.h> // used for RSA
+
+namespace SLNet
+{
+	namespace Experimental
+	{
+		namespace Crypto
+		{
+			class CFileEncrypter : public IFileEncrypter
+			{
+				// member variables
+				RSA *m_privateKey;
+				EVP_PKEY *m_privatePKey;
+				RSA *m_publicKey;
+				EVP_PKEY *m_publicPKey;
+				unsigned char m_sigBuffer[1024];
+				char m_sigBufferBase64[1369]; // 1369 = 1368 (size of base64-encoded 1k signature which is 1024 / 3 * 4 (representing 1023 bytes) + 4 bytes for the last byte) + 1 byte for trailing \0-terminator
+
+				// constructor
+			public:
+				// #high - drop the default ctor again (provide load from file instead incl. routing through customized file open handlers)
+				CFileEncrypter();
+				CFileEncrypter(const char *publicKey, size_t publicKeyLength);
+				CFileEncrypter(const char *publicKey, size_t publicKeyLength, const char *privateKey, size_t privateKeyLength, CSecureString &password);
+				~CFileEncrypter();
+			
+				// signing methods
+			public:
+				const unsigned char* SignData(const unsigned char *data, const size_t dataLength) override;
+				const char* SignDataBase64(const unsigned char *data, const size_t dataLength) override;
+				// #med reconsider/review interface here (char / unsigned char)
+				bool VerifyData(const unsigned char *data, const size_t dataLength, const unsigned char *signature, const size_t signatureLength) override;
+				bool VerifyDataBase64(const unsigned char *data, const size_t dataLength, const char *signature, const size_t signatureLength) override;
+
+				// internal helpers
+			private:
+				static int PasswordCallback(char *buffer, int bufferSize, int, void *password);
+				const char* SetPrivateKey(const char *privateKey, size_t privateKeyLength, CSecureString &password);
+				const char* SetPublicKey(const char *publicKey, size_t publicKeyLength);
+			};
+		}
+	}
+}