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[NewFeature] Add DES utils.
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-46
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‎libs/README.md

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This file was deleted.

‎src/com/worthed/util/DigestUtils.java

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@@ -15,56 +15,166 @@
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*/
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package com.worthed.util;
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import java.io.IOException;
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import java.security.MessageDigest;
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import java.security.SecureRandom;
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import javax.crypto.Cipher;
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import javax.crypto.SecretKey;
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import javax.crypto.SecretKeyFactory;
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import javax.crypto.spec.DESKeySpec;
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import sun.misc.BASE64Decoder;
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import sun.misc.BASE64Encoder;
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/**
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* DigestUtils
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*
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* 此工具类需要sun的jar包(%JAVA_HOME%\jre\lib\rt.jar)
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*
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* @author jingle1267@163.com
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*/
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public class DigestUtils {
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/**
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* Used to build output as Hex
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*/
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private static final char[] DIGITS_LOWER = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd',
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'e', 'f' };
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/**
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* encode By MD5
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*
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* @param str
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* @return String
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*/
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public static String md5(String str) {
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if (str == null) {
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return null;
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}
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try {
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MessageDigest messageDigest = MessageDigest.getInstance("MD5");
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messageDigest.update(str.getBytes());
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return new String(encodeHex(messageDigest.digest()));
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} catch (Exception e) {
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throw new RuntimeException(e);
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}
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}
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/**
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* Converts an array of bytes into an array of characters representing the hexadecimal values of each byte in order.
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* The returned array will be double the length of the passed array, as it takes two characters to represent any
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* given byte.
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*
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* @param data a byte[] to convert to Hex characters
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* @return A char[] containing hexadecimal characters
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*/
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protected static char[] encodeHex(final byte[] data) {
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final int l = data.length;
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final char[] out = new char[l << 1];
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// two characters form the hex value.
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for (int i = 0, j = 0; i < l; i++) {
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out[j++] = DIGITS_LOWER[(0xF0 & data[i]) >>> 4];
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out[j++] = DIGITS_LOWER[0x0F & data[i]];
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}
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return out;
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}
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private final static String DES = "DES";
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/**
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* Used to build output as Hex
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*/
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private static final char[] DIGITS_LOWER = { '0', '1', '2', '3', '4', '5',
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'6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
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/**
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* encode By MD5
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*
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* @param str
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* @return String
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*/
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public static String md5(String str) {
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if (str == null) {
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return null;
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}
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try {
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MessageDigest messageDigest = MessageDigest.getInstance("MD5");
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messageDigest.update(str.getBytes());
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return new String(encodeHex(messageDigest.digest()));
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} catch (Exception e) {
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throw new RuntimeException(e);
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}
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}
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/**
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* Converts an array of bytes into an array of characters representing the
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* hexadecimal values of each byte in order. The returned array will be
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* double the length of the passed array, as it takes two characters to
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* represent any given byte.
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*
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* @param data
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* a byte[] to convert to Hex characters
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* @return A char[] containing hexadecimal characters
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*/
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protected static char[] encodeHex(final byte[] data) {
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final int l = data.length;
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final char[] out = new char[l << 1];
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// two characters form the hex value.
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for (int i = 0, j = 0; i < l; i++) {
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out[j++] = DIGITS_LOWER[(0xF0 & data[i]) >>> 4];
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out[j++] = DIGITS_LOWER[0x0F & data[i]];
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}
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return out;
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}
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/**
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* Description 根据键值进行加密
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*
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* @param data
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* @param key
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* 加密键byte数组
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* @return
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* @throws Exception
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*/
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public static String encrypt(String data, String key) throws Exception {
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byte[] bt = encrypt(data.getBytes(), key.getBytes());
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String strs = new BASE64Encoder().encode(bt);
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return strs;
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}
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/**
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* Description 根据键值进行解密
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*
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* @param data
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* @param key
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* 加密键byte数组
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* @return
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* @throws IOException
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* @throws Exception
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*/
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public static String decrypt(String data, String key) throws IOException,
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Exception {
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if (data == null)
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return null;
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BASE64Decoder decoder = new BASE64Decoder();
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byte[] buf = decoder.decodeBuffer(data);
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byte[] bt = decrypt(buf, key.getBytes());
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return new String(bt);
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}
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/**
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* Description 根据键值进行加密
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*
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* @param data
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* @param key
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* 加密键byte数组
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* @return
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* @throws Exception
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*/
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private static byte[] encrypt(byte[] data, byte[] key) throws Exception {
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// 生成一个可信任的随机数源
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SecureRandom sr = new SecureRandom();
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// 从原始密钥数据创建DESKeySpec对象
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DESKeySpec dks = new DESKeySpec(key);
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// 创建一个密钥工厂，然后用它把DESKeySpec转换成SecretKey对象
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SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
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SecretKey securekey = keyFactory.generateSecret(dks);
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// Cipher对象实际完成加密操作
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Cipher cipher = Cipher.getInstance(DES);
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// 用密钥初始化Cipher对象
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cipher.init(Cipher.ENCRYPT_MODE, securekey, sr);
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return cipher.doFinal(data);
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}
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/**
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* Description 根据键值进行解密
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*
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* @param data
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* @param key
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* 加密键byte数组
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* @return
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* @throws Exception
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*/
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private static byte[] decrypt(byte[] data, byte[] key) throws Exception {
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// 生成一个可信任的随机数源
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SecureRandom sr = new SecureRandom();
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// 从原始密钥数据创建DESKeySpec对象
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DESKeySpec dks = new DESKeySpec(key);
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// 创建一个密钥工厂，然后用它把DESKeySpec转换成SecretKey对象
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SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
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SecretKey securekey = keyFactory.generateSecret(dks);
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// Cipher对象实际完成解密操作
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Cipher cipher = Cipher.getInstance(DES);
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// 用密钥初始化Cipher对象
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cipher.init(Cipher.DECRYPT_MODE, securekey, sr);
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return cipher.doFinal(data);
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}
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}

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