Thread: Xor Encryption Issue

Is this a valid xor encryption function?

Code:

#include <iostream>
#include <string>

using namespace std;

void xorEncrypt(string& str, string key)
{
    int strLen = str.length() - 1;

    for(int x=0; x <= strLen; x++)
    {
        str[x] = str[x]^key[x];
    }
}

int main()
{
    string key = "key";
    string text="This my text...";

    xorEncrypt(text,key);
    cout<<text<<endl;

    xorEncrypt(text,key);
    cout<<text<<endl;
}