在java中加密字符串,在node.js中解密,错误:解密错误

Question

我正在尝试加密java中的字符串,将其发送到我的node.js服务器,并解密它.但是,当我尝试这样做时,我会在尝试解密时不断收到错误.

Java加密:

String privateKey = "someprivatekey";
String data = "dataToEncrypt";

DESKeySpec keySpec = new DESKeySpec(privateKey.getBytes("UTF-8"));
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey key = keyFactory.generateSecret(keySpec);

byte[] dataToBytes = data.getBytes("UTF-8");      

Cipher cipher = Cipher.getInstance("DES"); 
cipher.init(Cipher.ENCRYPT_MODE, key);

// send this string to server 
String encryptedStr = Base64.encodeToString(cipher.doFinal(dataToBytes), 0);

node.js解密:

var privateKey = 'someprivatekey';
var decipher = crypto.createDecipher('des', privateKey);
var dec = decipher.update(textToDecipher, 'base64', 'utf8'); 
dec += decipher.final('utf8'); 
console.log('deciphered: ' + dec);

但是,我在decipher.final()行的node.js端遇到此错误:

TypeError: error:06065064:digital envelope routines:EVP_DecryptFinal_ex:bad decrypt

我已经尝试解码字符串并在节点端使用缓冲区,但它似乎也没有工作,我得到相同的错误解密错误.

var buffer = new Buffer(textToDecipher, 'base64');
var decipher = crypto.createDecipher('des', privateKey);
var dec = Buffer.concat([decipher.update(buffer), decipher.final()]);

我有什么想法可能做错了吗？

Answer 1

在节点服务器上创建解密对象时,您将传递密码而不是实际密钥.为了指定实际的密钥,你需要使用crypto.createDecipheriv(),但这需要一个实际的IV(这个例子使用8个空字节,但不推荐用于真正的加密; 维基百科上的初始化向量)

通过显式指定填充,块模式和IV,我能够使您的示例正常工作:

String privateKey = "someprivatekey";
String data = "dataToEncrypt";

DESKeySpec keySpec = new DESKeySpec(privateKey.getBytes("UTF-8"));
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey key = keyFactory.generateSecret(keySpec);

byte[] dataToBytes = data.getBytes("UTF-8");      

Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding"); 
cipher.init(Cipher.ENCRYPT_MODE, key, new IvParameterSpec(new byte[8]));

// send this string to server 
String encryptedStr = Base64.encodeToString(cipher.doFinal(dataToBytes), 0);

解密版本还明确指定了块模式(des-cbc),并正确地将密钥文本截断为前8个字节:

var privateKey = 'someprivatekey';
var textToDecipher = '9Y8GTNxhQkKSIm5pmH91VA=='; // Text "dataToEncrypt" encrypted using DES using CBC and PKCS5 padding with the key "someprivatekey"

var iv = new Buffer(8);
iv.fill(0);

var decipher = crypto.createDecipheriv('des-cbc', privateKey.substr(0,8), iv);
var dec = decipher.update(textToDecipher, 'base64', 'utf8');
dec += decipher.final('utf8');
console.log('deciphered: ' + dec);