Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
//License from project: Apache License 

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

public class Main {
    private final static String ALGORITHM = "DES";
    private final static String HEX = "0123456789ABCDEF";

    /**
     * Encrypt data
     * @param secretKey   -   a secret key used for encryption
     * @param data      -   data to encrypt
     * @return   Encrypted data
     * @throws Exception
     */
    public static String cipher(String secretKey, String data) throws Exception {
        // Key has to be of length 8
        if (secretKey == null || secretKey.length() != 8)
            throw new Exception("Invalid key length - 8 bytes key needed!");

        SecretKey key = new SecretKeySpec(secretKey.getBytes(), ALGORITHM);
        Cipher cipher = Cipher.getInstance(ALGORITHM);
        cipher.init(Cipher.ENCRYPT_MODE, key);

        return toHex(cipher.doFinal(data.getBytes()));
    }

    public static String toHex(byte[] stringBytes) {
        StringBuffer result = new StringBuffer(2 * stringBytes.length);

        for (int i = 0; i < stringBytes.length; i++) {
            result.append(HEX.charAt((stringBytes[i] >> 4) & 0x0f)).append(HEX.charAt(stringBytes[i] & 0x0f));
        }

        return result.toString();
    }
}