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();
}
