xor.inc // by namespace

/*
*                   XOR
*               __________________________________________________
*
*                   Copyright © 2012 by namespace
*               __________________________________________________
*
*                   21:01 | GMT + 1
*                   02.06.2012 | SATURDAY
*               __________________________________________________
*
*                   Credits:
*                       ._  namespace
*/

#if defined XOR
    #endinput
#endif

#define XOR

#define MAX_CRYPT_STRING            256

stock EncryptByXOR(source[], dest[], lenDest, key = -1)
{
    new temp[MAX_CRYPT_STRING], keySet;

    if (key == -1)
    {
        keySet = false;
        key = random(256);
    }
    else
    {
        keySet = true;
    }

    for (new i = 0; i < strlen(source); i++)
    {
        format(temp, lenDest, "%s%s", temp, source[i] ^ key);
    }

    if (!keySet) format(temp, lenDest, "%s:%d", temp, key);

    format(dest, lenDest, "%s", temp);
}

stock DecryptByXOR(source[], dest[], lenDest, key = -1)
{
    new temp[MAX_CRYPT_STRING], tempSource[MAX_CRYPT_STRING], realEncrypted[MAX_CRYPT_STRING], localKey;

    format(tempSource, sizeof(tempSource), "%s", source);

    if (key == -1)
    {
        new encryptedTemp[MAX_CRYPT_STRING];
        new keyTemp[MAX_CRYPT_STRING];
        new delimPos = strfind(tempSource, ":");

        format(encryptedTemp, sizeof(encryptedTemp), "%s", tempSource);
        format(keyTemp, sizeof(keyTemp), "%s", tempSource);

        strdel(encryptedTemp, delimPos, sizeof(keyTemp));
        strdel(keyTemp, 0, delimPos + 1);

        format(realEncrypted, sizeof(realEncrypted), "%s", encryptedTemp);
        localKey = strval(keyTemp);
    }
    else
    {
        format(realEncrypted, sizeof(realEncrypted), "%s", tempSource);
        localKey = key;
    }

    for (new i = 0; i < strlen(realEncrypted); i++)
    {
        format(temp, lenDest, "%s%s", temp, realEncrypted[i] ^ localKey);
    }

    format(dest, lenDest, "%s", temp);
}