DesEncrypter.java Source code

Introduction

Here is the source code for DesEncrypter.java

Source

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;

class DesEncrypter {
    Cipher ecipher;

    Cipher dcipher;

    DesEncrypter(SecretKey key) throws Exception {
        ecipher = Cipher.getInstance("DES");
        dcipher = Cipher.getInstance("DES");
        ecipher.init(Cipher.ENCRYPT_MODE, key);
        dcipher.init(Cipher.DECRYPT_MODE, key);
    }

    public String encrypt(String str) throws Exception {
        // Encode the string into bytes using utf-8
        byte[] utf8 = str.getBytes("UTF8");

        // Encrypt
        byte[] enc = ecipher.doFinal(utf8);

        // Encode bytes to base64 to get a string
        return new sun.misc.BASE64Encoder().encode(enc);
    }

    public String decrypt(String str) throws Exception {
        // Decode base64 to get bytes
        byte[] dec = new sun.misc.BASE64Decoder().decodeBuffer(str);

        byte[] utf8 = dcipher.doFinal(dec);

        // Decode using utf-8
        return new String(utf8, "UTF8");
    }
}

public class Main {
    public static void main(String[] argv) throws Exception {
        SecretKey key = KeyGenerator.getInstance("DES").generateKey();
        DesEncrypter encrypter = new DesEncrypter(key);
        String encrypted = encrypter.encrypt("Don't tell anybody!");
        String decrypted = encrypter.decrypt(encrypted);
    }
}