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。
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 = 'base';
/*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：
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 = 'base';
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:
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:
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"));
}
}