ibrcommon/ibrcommon/ssl/XORStream.cpp

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/*
 * XORStream.cpp
 *
 *  Created on: 13.07.2010
 *      Author: morgenro
 */

#include "ibrcommon/ssl/XORStream.h"

namespace ibrcommon
{
        XORStream::XORStream(std::ostream &stream, const CipherMode mode, std::string key)
         : CipherStream(stream, mode), _key(key), _key_pos(0)
        {
        }

        XORStream::~XORStream()
        {
        }

        void XORStream::encrypt(char *buf, const size_t size)
        {
                const char *keydata = _key.c_str();
                const size_t keylength = _key.length();

                for (size_t i = 0; i < size; i++)
                {
                        buf[i] = buf[i] ^ keydata[_key_pos];
                        _key_pos++;
                        if (_key_pos > keylength) _key_pos = 0;
                }
        }

        void XORStream::decrypt(char *buf, const size_t size)
        {
                const char *keydata = _key.c_str();
                const size_t keylength = _key.length();

                for (size_t i = 0; i < size; i++)
                {
                        buf[i] = buf[i] ^ keydata[_key_pos];
                        _key_pos++;
                        if (_key_pos > keylength) _key_pos = 0;
                }
        }
}