Hidden issues in crypto program.

The issues is that my Vigenere encryption program works to the point where you can encrypt things, and almost decrypt things perfectly. 9/10ths of the time the decryption works but when it decrypts something with over 4 spaces it might cut up the out put. Here is the code and header file.

Header

Code:

*I am going to make my own simple encryption program, cause thats what programmers do
  Name:TothEncrypt  
  Copyright: GNU Public Licence
  Author:Will Toth 
  Date Started: 29/10/07 14:02
  Description: Very Simple Encryption program 
*/
  
#include <iostream>
int TKeyNum=0;
class toth
{
      public:
            void SetNum(int keynum1){TKeyNum=keynum1;};   
            
            //Ceasar Shift Cypher. Works 100%. Is very easy to crack 
            void Tencrypt(int key1, char (&array1)[256] )
             {                                                             
                          int x;
                          int y;

                          for(x=0;array1[x]!='\0';x++)
                          {
                                for(y=0;y<256;y++)
                                {
                                    //std::cout << (char)y << std::endl;
                                    if(array1[x]==(char)y) 
                                     // When the charater in the array is equal to the one in the loop
                                    
                                    {
                                        array1[x]=(char)(y+key1); 
                                        //  it adds x (key1) to the current character
                                        y=0;
                                        break;
                                    }
                                }
                            }


                    
             }
             
              void Tdecrypt(int key1, char (&array1)[256] )
             {                                                             
                          int x;
                          int y;

                          for(x=0;array1[x]!='\0';x++)
                          {
                                for(y=0;y<256;y++)
                                {
                                    //std::cout << (char)y << std::endl;
                                    if(array1[x]==(char)y) 
                                     // When the charater in the array is equal to the one in the loop
                                    
                                    {
                                        array1[x]=(char)(y-key1); 
                                        //  it adds x (key1) to the current character
                                        y=0;
                                        break;
                                    }
                                }
                            }


                    
             }
             
             
             //Vingere Cypher

             void Tencrypt(char textkey[], char (&array1)[256])
             {
                    
                    int x;
                    int y;
                    int z=0;
                    int key1;
                          
                   
                        for(x=0;array1[x]!='\0';x++)     //scans whole thing
                          {
                                
                                 
                                    { 
                                           if(z==strlen(textkey))
                                                {
                                                     z=0;                                                     
                                                }
                                           key1=((int)(textkey[z])-'a');
                                           z++;
                                          
                                
                                    }
                                                                 
                                
                                
                                
                                std::cout << key1 << std::endl; 
                                            for(y=0;y<256;y++)
                                            {
                                                //std::cout << (char)y << std::endl;
                                             if(array1[x]==(char)y)
                                              {
                                                  array1[x]=(char)(y+key1);
                                                   y=0;
                                                  break;
                                               }
                                            }
                                
                            }
             }
             
             void Tdecrypt(char textkey[], char (&array1)[256])
             {
                    
                    int x;
                    int y;
                    int z=0;
                    int key1;
                          
                   
                        for(x=0;array1[x]!='\0';x++)     //scans whole thing
                          {                              
                                 
                                    
                                    { 
                                           if(z==strlen(textkey))
                                                {
                                                     z=0;                                                     
                                                }
                                           key1=((int)(textkey[z])-'a');
                                           z++;
                                          
                                
                                    }
                                                             
                                  
                                
                                
                                
                                std::cout << key1 << std::endl; 
                                            for(y=0;y<256;y++)
                                            {
                                                //std::cout << (char)y << std::endl;
                                             if(array1[x]==(char)y)
                                              {
                                                  array1[x]=(char)(y-key1);
                                                   y=0;
                                                  break;
                                               }
                                            }
                                
                            }
             }
            
             
};

Main program

Code:

//#include <iostream>
#include "tothencrypt.h"
#include <iostream>
int main()
{
    //char dog[4];
    toth newtoth;
    char dog[256] = "the desert fox got foxed";
    
    char keyword[256] = "YouCant gef Daf";
    char cat[256] = "Adam Hendrickson Is A crazy Pshyco ..........";
    /*int i = strlen(keyword);
    cout << "i = : "<< i << endl; */
    //newtoth.Tencrypt(3,cat);
    newtoth.Tencrypt(keyword,dog);   //should be Forltuulod
    std::cout << "dog :" << dog << "\tShould be: Forltuulod" << std::endl 
        << "Cat :" << cat << "\tShould be: Fdoliruqld" << std::endl;
    newtoth.Tdecrypt(keyword,dog);
    std::cout << dog;    
    getchar();
}

My bro will fixed it. Thanks for your time.