des加密解密及md5加密

package com.common; import javax.crypto.*; import javax.crypto.spec.DESKeySpec; import javax.crypto.spec.IvParameterSpec; /*字符串 DESede(3DES) 加密*/ public class DES { //private byte[] desKey; 8位 //解密数据 public static String decrypt(String message,String key) throws Exception { byte[] bytesrc =convertHexString(message); Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding"); DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8")); SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES"); SecretKey secretKey = keyFactory.generateSecret(desKeySpec); IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8")); cipher.init(Cipher.DECRYPT_MODE, secretKey, iv); byte[] retByte = cipher.doFinal(bytesrc); String s = java.net.URLDecoder.decode(new String(retByte), "utf-8") ; return s; } //加密数据 public static String encrypt(String message, String key) throws Exception { String s=java.net.URLEncoder.encode(message, "utf-8").toLowerCase(); Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding"); DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8")); SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES"); SecretKey secretKey = keyFactory.generateSecret(desKeySpec); IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8")); cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv); return toHexString(cipher.doFinal(s.getBytes("UTF-8"))).toUpperCase(); } public static byte[] convertHexString(String ss) { byte digest[] = new byte[ss.length() / 2]; for(int i = 0; i < digest.length; i++) { String byteString = ss.substring(2 * i, 2 * i + 2); int byteValue = Integer.parseInt(byteString, 16); digest[i] = (byte)byteValue; } return digest; } public static String toHexString(byte b[]) { StringBuffer hexString = new StringBuffer(); for (int i = 0; i < b.length; i++) { String plainText = Integer.toHexString(0xff & b[i]); if (plainText.length() < 2) plainText = "0" + plainText; hexString.append(plainText); } return hexString.toString(); } public static void main(String[] args) throws Exception { String key = "11111111"; String value="tesdt"; System.out.println("加密数据为:"+value); String a=encrypt(value, key); System.out.println("加密后的数据为:"+a); String b=decrypt(a,key); System.out.println("解密后的数据:"+b); } }