DES加解密工具类

来源：互联网发布：机器视觉主流算法编辑：程序博客网时间：2024/06/06 00:12
Des算法加解密.注意,这里的key使用的是固定值+ip地址的八个字节的字节数组.在生成数组的时候,byte值为-128-127,所以,如果是192什么的,会超出byte的大小,可以直接对数字进行强转为byte型,也可以转为16进制数,还可以直接用他的负值来替换.这里的数组{0,1,0,8,192,168,1,103}不管怎么转换,最后其实都是{0,1,0,8,-64,-88,1,103}
package com.freetek.cc.utils;import com.sun.org.apache.xerces.internal.impl.dv.util.Base64;import sun.misc.BASE64Decoder;import sun.misc.BASE64Encoder;import javax.crypto.Cipher;import javax.crypto.SecretKey;import javax.crypto.SecretKeyFactory;import javax.crypto.spec.DESKeySpec;import javax.crypto.spec.IvParameterSpec;import javax.crypto.spec.SecretKeySpec;import java.io.IOException;import java.net.InetAddress;import java.security.SecureRandom;/** * DES加密 解密算法 * @author Young * @version 2017/5/5 * @email yangxiaoping@freetek.cc */public class DesUtil {    private final static String DES = "DES";    private final static String ENCODE = "utf-8";    //默认key值    private final static String defaultKey = "test1234";    //运营系统提供的ticket    private final static String sysTicket = "123d8ce011a5abf1edf62df84123c6b2";    private final static String localTicket = "freetekcc";    public static void main(String[] args) throws Exception {        // 获取IP地址        byte[] address = InetAddress.getLocalHost().getAddress();        //直接数字转byte        byte[] k = {(byte) 0,(byte) 1,(byte) 0,(byte) 8, (byte) 192,(byte) 168,(byte) 1,(byte) 103};        //转换为16进制转byte        byte[] k1 = {(byte)0x0,(byte)0x1,(byte)0,(byte)8, (byte) 0xC0,(byte)0xA8,(byte)1,(byte)0x67};        //直接获取ip拼接        byte[] pre_k = {0,1,0,8};        byte[] key = addBytes(pre_k,address);        /*String encrypt = encrypt(sysTicket, k);        System.out.println("加密后的数据:" + encrypt);        String decrypt = decrypt(encrypt, k);        System.out.println("解密后的数据:" + decrypt);*/        String encrypt2 = encryptIV(sysTicket, key);        System.out.println("带IV值的加密后的数据:" + encrypt2);        String decrypt2 = decryptIV(encrypt2, key);        System.out.println("带IV值的解密后的数据:" + decrypt2);    }    /**     * 带iv值的解密     * 这里的iv值跟key值一样     * @param decryptString     * @param decryptKey     * @return     * @throws Exception     */    public static String decryptIV(String decryptString, byte[] decryptKey)            throws Exception {        IvParameterSpec iv = new IvParameterSpec(decryptKey);        SecretKeySpec key = new SecretKeySpec(decryptKey, "DES");        Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");        cipher.init(Cipher.DECRYPT_MODE, key, iv);        return new String(cipher.doFinal(Base64.decode(decryptString)));    }    /**     * 带iv值的加密     * 这里的iv值跟key值一样     * @param encryptString     * @param encryptKey     * @return     * @throws Exception     */    public static String encryptIV(String encryptString, byte[] encryptKey)            throws Exception {        IvParameterSpec iv = new IvParameterSpec(encryptKey);        DESKeySpec dks = new DESKeySpec(encryptKey);        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");        SecretKey key = keyFactory.generateSecret(dks);        Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");        cipher.init(Cipher.ENCRYPT_MODE, key, iv);        return Base64.encode(cipher.doFinal(encryptString.getBytes()));    }    /**     * 使用 默认key 加密     */    public static String encrypt(String data) throws Exception {        byte[] bt = encrypt(data.getBytes(ENCODE), defaultKey.getBytes(ENCODE));        String strs = new BASE64Encoder().encode(bt);        return strs;    }    /**     * 使用 默认key 解密     */    public static String decrypt(String data) throws IOException, Exception {        if (data == null)            return null;        BASE64Decoder decoder = new BASE64Decoder();        byte[] buf = decoder.decodeBuffer(data);        byte[] bt = decrypt(buf, defaultKey.getBytes(ENCODE));        return new String(bt, ENCODE);    }    /**     * Description 根据键值进行加密     *     * @param data     * @param key     *            加密键byte数组     * @return     * @throws Exception     */    public static String encrypt(String data, String key) throws Exception {        byte[] bt = encrypt(data.getBytes(ENCODE), key.getBytes(ENCODE));        String strs = new BASE64Encoder().encode(bt);        return strs;    }    /**     * Description 根据键值进行解密     *     * @param data     * @param key     *            加密键byte数组     * @return     * @throws IOException     * @throws Exception     */    public static String decrypt(String data, String key) throws IOException,            Exception {        if (data == null)            return null;        BASE64Decoder decoder = new BASE64Decoder();        byte[] buf = decoder.decodeBuffer(data);        byte[] bt = decrypt(buf, key.getBytes(ENCODE));        return new String(bt, ENCODE);    }    /**     * Description 根据键值进行加密     *     * @param data     * @param key     *            加密键byte数组     * @return     * @throws Exception     */    public static String encrypt(String data, byte[] key) throws Exception {        byte[] bt = encrypt(data.getBytes(ENCODE), key);        String strs = new BASE64Encoder().encode(bt);        return strs;    }    /**     * Description 根据键值进行解密     *     * @param data     * @param key     *            加密键byte数组     * @return     * @throws IOException     * @throws Exception     */    public static String decrypt(String data, byte[] key) throws IOException,            Exception {        if (data == null)            return null;        BASE64Decoder decoder = new BASE64Decoder();        byte[] buf = decoder.decodeBuffer(data);        byte[] bt = decrypt(buf, key);        return new String(bt, ENCODE);    }    /**     * Description 根据键值进行加密     *     * @param data     * @param key     *            加密键byte数组     * @return     * @throws Exception     */    private static byte[] encrypt(byte[] data, byte[] key) throws Exception {        // 生成一个可信任的随机数源        SecureRandom sr = new SecureRandom();        // 从原始密钥数据创建DESKeySpec对象        DESKeySpec dks = new DESKeySpec(key);        // 创建一个密钥工厂，然后用它把DESKeySpec转换成SecretKey对象        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);        SecretKey securekey = keyFactory.generateSecret(dks);        // Cipher对象实际完成加密操作        Cipher cipher = Cipher.getInstance(DES);        // 用密钥初始化Cipher对象        cipher.init(Cipher.ENCRYPT_MODE, securekey, sr);        return cipher.doFinal(data);    }    /**     * Description 根据键值进行解密     *     * @param data     * @param key     *            加密键byte数组     * @return     * @throws Exception     */    private static byte[] decrypt(byte[] data, byte[] key) throws Exception {        // 生成一个可信任的随机数源        SecureRandom sr = new SecureRandom();        // 从原始密钥数据创建DESKeySpec对象        DESKeySpec dks = new DESKeySpec(key);        // 创建一个密钥工厂，然后用它把DESKeySpec转换成SecretKey对象        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);        SecretKey securekey = keyFactory.generateSecret(dks);        // Cipher对象实际完成解密操作        Cipher cipher = Cipher.getInstance(DES);        // 用密钥初始化Cipher对象        cipher.init(Cipher.DECRYPT_MODE, securekey, sr);        return cipher.doFinal(data);    }    /**     *     * @param data1     * @param data2     * @return data1 与 data2拼接的结果     */    public static byte[] addBytes(byte[] data1, byte[] data2) {        byte[] data3 = new byte[data1.length + data2.length];        System.arraycopy(data1, 0, data3, 0, data1.length);        System.arraycopy(data2, 0, data3, data1.length, data2.length);        return data3;    }}
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