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random.cpp

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+/* Copyright (c) 2018 Albert S.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+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 AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+#include <sstream>
+#include <exception>
+#include <memory>
+#include "random.h"
+#include "logger.h"
+
+Random::Random()
+{
+}
+
+std::string Random::getRandomHexString(unsigned int bytes)
+{
+	std::stringstream stream;
+
+	auto buffer = std::make_unique<char[]>(bytes);
+	int r = getrandom(buffer.get(), bytes, GRND_NONBLOCK);
+	if(r != -1 && (size_t)r == bytes)
+	{
+		for(size_t i = 0; i < bytes; i++)
+		{
+			unsigned char c = (unsigned char)buffer[i];
+			stream << std::hex << (unsigned int)c;
+		}
+		return stream.str();
+	}
+	else
+	{
+
+		Logger::error() << "Random generator failed to get bytes: " + std::to_string(r);
+		throw std::runtime_error("Random generator failed");
+	}
+}