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genrsakey.cpp

//
// genrsakey.cpp
//
// $Id: //poco/1.3/Crypto/samples/genrsakey/src/genrsakey.cpp#1 $
//
// This sample demonstrates the XYZ class.
//
// Copyright (c) 2007, 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,
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// DEALINGS IN THE SOFTWARE.
//


#include "Poco/Util/Application.h"
#include "Poco/Util/Option.h"
#include "Poco/Util/OptionException.h"
#include "Poco/Util/OptionSet.h"
#include "Poco/Util/HelpFormatter.h"
#include "Poco/Util/AbstractConfiguration.h"
#include "Poco/AutoPtr.h"
#include "Poco/NumberFormatter.h"
#include "Poco/NumberParser.h"
#include "Poco/String.h"
#include "Poco/Crypto/RSAKey.h"
#include <iostream>


using Poco::Util::Application;
using Poco::Util::Option;
using Poco::Util::OptionSet;
using Poco::Util::HelpFormatter;
using Poco::Util::AbstractConfiguration;
using Poco::Util::OptionCallback;
using Poco::AutoPtr;
using Poco::NumberParser;
using Poco::Crypto::RSAKey;


00060 class RSAApp: public Application
      /// This sample demonstrates some of the features of the Util::Application class,
      /// such as configuration file handling and command line arguments processing.
      ///
      /// Try genrsakey --help (on Unix platforms) or genrsakey /help (elsewhere) for
      /// more information.
{
public:
      RSAApp():
        _helpRequested(false),
             _length(RSAKey::KL_1024),
             _exp(RSAKey::EXP_LARGE),
             _name(),
             _pwd()
      {
      }

protected:  
00078       void initialize(Application& self)
      {
            loadConfiguration(); // load default configuration files, if present
            Application::initialize(self);
      }
      
00084       void uninitialize()
      {
            Application::uninitialize();
      }
      
00089       void reinitialize(Application& self)
      {
            Application::reinitialize(self);
      }
      
00094       void defineOptions(OptionSet& options)
      {
            Application::defineOptions(options);

            options.addOption(
                  Option("help", "h", "display help information on command line arguments")
                        .required(false)
                        .repeatable(false)
                        .callback(OptionCallback<RSAApp>(this, &RSAApp::handleHelp)));

            options.addOption(
                  Option("?", "?", "display help information on command line arguments")
                        .required(false)
                        .repeatable(false)
                        .callback(OptionCallback<RSAApp>(this, &RSAApp::handleHelp)));

            options.addOption(
                  Option("key", "k", "define the key length")
                        .required(false)
                        .repeatable(false)
                        .argument("512|1024|2048|4096")
                        .callback(OptionCallback<RSAApp>(this, &RSAApp::handleKeyLength)));
                        
            options.addOption(
                  Option("exponent", "e", "defines the exponent of the key")
                        .required(false)
                        .repeatable(false)
                        .argument("small|large")
                        .callback(OptionCallback<RSAApp>(this, &RSAApp::handleExponent)));

            options.addOption(
                  Option("file", "f", "defines the file base name. creates a file.pub and a file.priv")
                        .required(true)
                        .repeatable(false)
                        .argument("filebasename")
                        .callback(OptionCallback<RSAApp>(this, &RSAApp::handleFilePrefix)));

            options.addOption(
                  Option("password", "p", "defines the password used to encrypt the private key file. If not defined user will be asked via stdin to provide in")
                        .required(false)
                        .repeatable(false)
                        .argument("pwd")
                        .callback(OptionCallback<RSAApp>(this, &RSAApp::handlePassword)));
      }
      
      void handleHelp(const std::string& name, const std::string& value)
      {
            _helpRequested = true;
            displayHelp();
            stopOptionsProcessing();
      }
      
      void handleKeyLength(const std::string& name, const std::string& value)
      {
            int keyLen = Poco::NumberParser::parse(value);
            if (keyLen == 512 || keyLen == 1024 || keyLen == 2048 || keyLen == 4096)
                  _length = (RSAKey::KeyLength)keyLen;
            else
                  throw Poco::Util::IncompatibleOptionsException("Illegal key length value");
      }

      void handleExponent(const std::string& name, const std::string& value)
      {
            if (Poco::icompare(value, "small") == 0)
                  _exp = RSAKey::EXP_SMALL;
            else
                  _exp = RSAKey::EXP_LARGE;
      }

      void handleFilePrefix(const std::string& name, const std::string& value)
      {
            if (value.empty())
                  throw Poco::Util::IncompatibleOptionsException("Empty file prefix forbidden");
            _name = value;
      }
      
      void handlePassword(const std::string& name, const std::string& value)
      {
            _pwd = value;
      }
            
      void displayHelp()
      {
            HelpFormatter helpFormatter(options());
            helpFormatter.setCommand(commandName());
            helpFormatter.setUsage("OPTIONS");
            helpFormatter.setHeader("Application for generating RSA public/private key pairs.");
            helpFormatter.format(std::cout);
      }

00184       int main(const std::vector<std::string>& args)
      {
            if (!_helpRequested)
            {
                  logger().information("Generating key with length " + Poco::NumberFormatter::format((int)_length));
                  logger().information(std::string("Exponent is ") + ((_exp == RSAKey::EXP_SMALL)?"small":"large"));
                  logger().information("Generating key");
                  RSAKey key(_length, _exp);
                  logger().information("Generating key: DONE");
                  std::string pubFile(_name + ".pub");
                  std::string privFile(_name + ".priv");
                  
                  logger().information("Saving key to " + pubFile + " and " + privFile);
                  key.save(pubFile, privFile, _pwd);
                  logger().information("Key saved");
            }
            return Application::EXIT_OK;
      }
      
private:
      bool _helpRequested;
      RSAKey::KeyLength _length;
      RSAKey::Exponent  _exp;
      std::string       _name;
      std::string       _pwd;
};


POCO_APP_MAIN(RSAApp)

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