A function to encrypt/decrypt a string using XOR e source codeThis snippet submitted by Major_Small on 2005-01-27. It has been viewed 56378 times.Rating of 6.7 with 340 votes /*******************************************************************************
XOR.cpp
This function takes in two strings (value,key) and uses XOR encryption to
encrypt (and decrypt) the value using the key. it returns the encrypted
value as a C++ string.
John Shao
For more on XOR encryption: http://www.cprogramming.com/tutorial/xor.html
********************************************************************************
This work is hereby released into the Public Domain. To view a copy of the
public domain dedication, visit
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*******************************************************************************/
#include<iostream>
using std::string;
string XOR(string value,string key)
{
string retval(value);
short unsigned int klen=key.length();
short unsigned int vlen=value.length();
short unsigned int k=0;
short unsigned int v=0;
for(v;v<vlen;v++)
{
retval[v]=value[v]^key[k];
k=(++k<klen?k:0);
}
return retval;
}
/******************************************************************************/
/* Here's a Test Program */
/******************************************************************************/
/*
#include<iostream>
int main()
{
std::string value("Hello World");
std::string key("key");
std::cout<<"Plain text: "<<value<<"\n\n";
value=XOR(value,key);
std::cout<<"Cipher text: "<<value<<"\n\n";
value=XOR(value,key);
std::cout<<"Decrypted text: "<<value<<std::endl;
std::cin.get();
return 0;
}
*/
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