Java字符串加密解密MD5

来源：互联网发布：温长卿知乎编辑：程序博客网时间：2024/06/05 06:40
package com.fisee.utils; import java.io.IOException;import java.security.SecureRandom; import javax.crypto.Cipher;import javax.crypto.SecretKey;import javax.crypto.SecretKeyFactory;import javax.crypto.spec.DESKeySpec;import Decoder.BASE64Decoder;import Decoder.BASE64Encoder;  public class Des {     private final static String DES = "DES";         /**     * 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(), key.getBytes());        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());        return new String(bt);    }     /**     * 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);    }/**     * Description 获取字符串MD5值     * @param sourceStr     */private static String MD5(String sourceStr) {String result = "";try {MessageDigest md = MessageDigest.getInstance("MD5");md.update(sourceStr.getBytes());byte b[] = md.digest();int i;StringBuffer buf = new StringBuffer("");for (int offset = 0; offset < b.length; offset++) {i = b[offset];if (i < 0)i += 256;if (i < 16)buf.append("0");buf.append(Integer.toHexString(i));}result = buf.toString();// System.out.println("MD5(" + sourceStr + ",32) = " + result);// System.out.println("MD5(" + sourceStr + ",16) = " +// buf.toString().substring(8, 24));} catch (NoSuchAlgorithmException e) {log.error(e.getMessage());}return result;}public static void main(String[] args) throws Exception {        String data = "{devType:\"1\",Sys:\"01\",Name:\"张三\",PoId:\"000002\",TarPho:\"15527609770\",Desc:\"张三偷窃\"}";        String key = "12345678";//秘钥        String encode = encrypt(data, key);        System.err.println(encode);        String dcode = decrypt(encode, key);        System.err.println(dcode);    }}
0 0