#include <iostream>
#include <string>

using namespace std;

static const char hexArr[] = "0123456789ABCDEF";

string encrypt(string &str){
    string crypt;
    unsigned char tmp;

    srand(str.size());
    for (unsigned int i=0; i<str.size(); i++){
        tmp = str[i];
        tmp += rand() % 255;
        crypt += hexArr[(tmp & 0xf0) >> 4];
        crypt += hexArr[tmp & 0x0f];
    }
    return crypt;
}

string decrypt(string &str){
    string crypt;
    unsigned char tmp, val=0;

    if (str.size() % 2) return crypt;

    srand(str.size()/2);
    for (unsigned int i=0; i<str.size(); i++){
        tmp = str[i];
        if (tmp <= '9') tmp -= 48;
        else tmp -= 48+7;
        if (i%2 == 0){
            if (val){
                val -= rand() % 255;
                crypt += val;
            }
            val = tmp << 4;
        }else{
            val |= tmp;
        }
    }
    return crypt;
}

int main(){
    string userName = "myUserNameGoesHere";
    string passWord = "hereBmIpaSs";
    string cryptName, cryptPass;
    string deCryptName, deCryptPass;
    string name = "CE709910B2E24FDB69F7CABD98024DAC060E";
    string pass = "B2D154F56B93D9C51D2905";

    cryptName = encrypt(userName);
    cryptPass = encrypt(passWord);

    deCryptName = decrypt(cryptName);
    deCryptPass = decrypt(cryptPass);

    cout << "Plaintext: " << userName;
    cout << "\n\tcyphertext: " << cryptName;
    cout << "\n\tdecrypted: " << deCryptName;
    cout << "\n\tembedded string decrypted: " << decrypt(name);
    cout << endl << endl;

    cout << "Plaintext: " << passWord;
    cout << "\n\tcyphertext: " << cryptPass;
    cout << "\n\tdecrypted: " << deCryptPass;
    cout << "\n\tembedded string decrypted: " << decrypt(pass);
    cout << endl;

    return 0;
}