例子一：

这几天被一个问题困扰着。Nodejs的AES加密和Java，C#加密出来的不一致。当然，这样就不能解密了。纠结了许久：后来还是实在不行了，看了下源代码，要不然还得继续纠结下去。网上说，通常的nodejs AES和其他语言实现不一样。好吧~~或许吧。
nodejs的crypto模块。
复制代码 代码如下:
var crypto = require('crypto');

    var data = "156156165152165156156";
    console.log('Original cleartext: ' + data);
    var algorithm = 'aes-128-ecb';
    var key = '78541561566';
    var clearEncoding = 'utf8';
    //var cipherEncoding = 'hex';
    //If the next line is uncommented, the final cleartext is wrong.
    var cipherEncoding = 'base64';
/*加密*/
    var cipher = crypto.createCipher(algorithm, key);

    var cipherChunks = [];
    cipherChunks.push(cipher.update(data, clearEncoding, cipherEncoding));
    cipherChunks.push(cipher.final(cipherEncoding));
    console.log(cipherEncoding + ' ciphertext: ' + cipherChunks.join(''));
/*解密*/
    var decipher = crypto.createDecipher(algorithm, key);
    var plainChunks = [];
    for (var i = 0;i < cipherChunks.length;i++) {
      plainChunks.push(decipher.update(cipherChunks[i], cipherEncoding, clearEncoding));

    }
    plainChunks.push(decipher.final(clearEncoding));
    console.log("UTF8 plaintext deciphered: " + plainChunks.join(''));
的确，没错~~加密解密成功。但是和java，C#中加密出来的不一样啊。神啊。我想，大家都在这里纠结着吧~~对不对。其实只要加个向量，就可以和一致了。网上搜索出来的资源太少。才让自己纠结那么久。好吧，正确代码是：
复制代码 代码如下:
var crypto = require('crypto');

    var data = "156156165152165156156";
    console.log('Original cleartext: ' + data);
    var algorithm = 'aes-128-ecb';
    var key = '78541561566';
    var clearEncoding = 'utf8';
    var iv = "";
    //var cipherEncoding = 'hex';
    //If the next line is uncommented, the final cleartext is wrong.
    var cipherEncoding = 'base64';
    var cipher = crypto.createCipheriv(algorithm, key,iv);

    var cipherChunks = [];
    cipherChunks.push(cipher.update(data, clearEncoding, cipherEncoding));
    cipherChunks.push(cipher.final(cipherEncoding));
    console.log(cipherEncoding + ' ciphertext: ' + cipherChunks.join(''));

    var decipher = crypto.createDecipheriv(algorithm, key,iv);
    var plainChunks = [];
    for (var i = 0;i < cipherChunks.length;i++) {
      plainChunks.push(decipher.update(cipherChunks[i], cipherEncoding, clearEncoding));

    }
    plainChunks.push(decipher.final(clearEncoding));
    console.log("UTF8 plaintext deciphered: " + plainChunks.join(''));
对比发现，加密出来是一致的。好吧，结贴~~~我恨你，浪费了我一天时间。

例子二：

工作中遇到nodejs端通过aes加密，安卓客户端java解密，同意nodejs也需要解密安卓客户端加密过来的内容，发现两个加密结果不一样，查询资料发现java端需要对密钥za再MD5加密一遍，以下是aes ecb加密的内容，如果是cbc也同样需要对秘钥MD5加密：

nodejs:
复制代码 代码如下:
/**
 * aes加密
 * @param data
 * @param secretKey
 */ 
encryptUtils.aesEncrypt = function(data, secretKey) { 
    var cipher = crypto.createCipher('aes-128-ecb',secretKey); 
    return cipher.update(data,'utf8','hex') + cipher.final('hex'); 
} 

/**
 * aes解密
 * @param data
 * @param secretKey
 * @returns {*}
 */ 
encryptUtils.aesDecrypt = function(data, secretKey) { 
    var cipher = crypto.createDecipher('aes-128-ecb',secretKey); 
    return cipher.update(data,'hex','utf8') + cipher.final('utf8'); 
} 

java:
复制代码 代码如下:
package com.iofamily.util; 

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
     */ 
    private static String decrypt(String encrypted, String seed) throws Exception { 
        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, String key) throws Exception { 
        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(); 
    } 

    public static void main(String[] args) throws Exception { 
        System.out.println(AESForNodejs.encrypt("fsadfsdafsdafsdafsadfsadfsadf", "1234fghjnmlkiuhA")); 
        System.out.println(AESForNodejs.decrypt("5b8e85b7a86ad15a275a7cb61fe4c0606005e8741f68797718a3e90d74b5092a", "1234fghjnmlkiuhA")); 
    } 
}