由于开发项目使用Java做的后台管理系统，而用户使用平台为nodejs编写，故需要实现两个平台的相同加密解密方式，我这里是使用了AES进行实现。

nodejs

定义

//引入组件
var crypto = require('crypto');
//加密
var aesEncrypt = function (data, secretKey) {
  var cipher = crypto.createCipher('aes-128-ecb', secretKey);
  return cipher.update(data, 'utf8', 'hex') + cipher.final('hex');
}
//解密
var aesDecrypt = function (data, secretKey) {
  var cipher = crypto.createDecipher('aes-128-ecb', secretKey);
  return cipher.update(data, 'hex', 'utf8') + cipher.final('utf8');
}

使用方法

    //解密（传入已加密的密码和自定义的解密key）
    var db_password = aesDecrypt(password, "1234567887654321");
    //加密（传入需要加密的密码和自定义的加密key）
    var new_password = aesEncrypt(password, "1234567887654321");

注意加密和解密的key需要一致，是由数字和字母组成的字符串，而且需要是16位！！否则的话可能会出错

java

定义

package com.web.controller.tool;
 
import java.security.MessageDigest;
 
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
 
/**
 * AES加密，与Nodejs 保持一致
 * @author lmiky
 * @date 2014-2-25
 */
public class AESForNodejs {
	public static final String DEFAULT_CODING = "utf-8";
 
	/**
	 * 解密
	 * @author lmiky
	 * @date 2014-2-25
	 * @param encrypted
	 * @param seed
	 * @return
	 * @throws Exception
	 */
	public static String decrypt(String encrypted) throws Exception {
		String seed = "1234567887654321";//此处需要和nodejs里的key一致
		byte[] keyb = seed.getBytes(DEFAULT_CODING);
		MessageDigest md = MessageDigest.getInstance("MD5");
		byte[] thedigest = md.digest(keyb);
		SecretKeySpec skey = new SecretKeySpec(thedigest, "AES");
		Cipher dcipher = Cipher.getInstance("AES");
		dcipher.init(Cipher.DECRYPT_MODE, skey);
 
		byte[] clearbyte = dcipher.doFinal(toByte(encrypted));
		return new String(clearbyte);
	}
 
	/**
	 * 加密
	 * @author lmiky
	 * @date 2014-2-25
	 * @param content
	 * @param key
	 * @return
	 * @throws Exception
	 */
	public static String encrypt(String content) throws Exception {
		String key = "1234567887654321";//此处需要和nodejs里的key一致
		byte[] input = content.getBytes(DEFAULT_CODING);
		
		MessageDigest md = MessageDigest.getInstance("MD5");
		byte[] thedigest = md.digest(key.getBytes(DEFAULT_CODING));
		SecretKeySpec skc = new SecretKeySpec(thedigest, "AES");
		Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
		cipher.init(Cipher.ENCRYPT_MODE, skc);
		
		byte[] cipherText = new byte[cipher.getOutputSize(input.length)];
		int ctLength = cipher.update(input, 0, input.length, cipherText, 0);
		ctLength += cipher.doFinal(cipherText, ctLength);
	    	
		return parseByte2HexStr(cipherText);
	}
	
	/**
	 * 字符串转字节数组
	 * @author lmiky
	 * @date 2014-2-25
	 * @param hexString
	 * @return
	 */
	private static byte[] toByte(String hexString) {
		int len = hexString.length() / 2;
		byte[] result = new byte[len];
		for (int i = 0; i < len; i++) {
			result[i] = Integer.valueOf(hexString.substring(2 * i, 2 * i + 2), 16).byteValue();
		}
		return result;
	}
	
	/**
	 * 字节转16进制数组
	 * @author lmiky
	 * @date 2014-2-25
	 * @param buf
	 * @return
	 */
	private static String parseByte2HexStr(byte buf[]) {
		StringBuffer sb = new StringBuffer();
		for (int i = 0; i < buf.length; i++) {
			String hex = Integer.toHexString(buf[i] & 0xFF);
			if (hex.length() == 1) {
				hex = '0' + hex;
			}
			sb.append(hex);
		}
		return sb.toString();
	}
}

使用

     //解密
		String db_password = AESForNodejs.decrypt(password);
	//加密
		String new_password = AESForNodejs.encrypt(password);