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，并对其进行解密。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()]);

任何想法我可能做错了什么？

Answer 1

在节点服务器上创建解密对象时，您传递的是密码而不是实际密钥。为了指定实际密钥，您需要使用crypto.createDecipheriv()，但这需要实际的IV（此示例使用8个空字节，但不建议用于实际加密; Initialization Vector on wikipedia）

我能够通过显式指定填充，块模式和IV来实现您的示例：

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);

Answer 2

Java加密的DES默认模式是ECB，您需要在nodejs中指定：

var decipher = crypto.createDecipheriv('des-ecb', key, new Buffer(0))
var txt = decipher.update(encrypt_text, 'hex', 'utf8');
txt += decipher.final('utf8')
return txt

在java中加密字符串，在node.js中解密，错误：解密错误

2 个答案: