如何在客户端使用crypto-js库加密消息，并在Java服务器解密 [英] How to encrypt a message at client side using crypto-js library and decrypt it at the Java server
问题描述
背景：
我正在处理的应用程序应该离线工作。我有一个HTML5页面，用户键入的数据是使用crypto-js库加密。
我想将加密的邮件发送到java webserver，然后在服务器端解密。
Background: the application that I am working on is supposed to work offline. I have an HTML5 page and the data keyed in by the user is encrypted using crypto-js library. And I want the encrypted message sent to java webserver and then decrypt it at the server side.
正在做什么
我可以使用Crypto-js加密邮件
What am doing I am able to encrypt the message using Crypto-js
<code>
var message = "my message text";
var password = "user password";
var encrypted = CryptoJS.AES.encrypt( message ,password );
console.log(encrypted.toString());
// this prints an encrypted text "D0GBMGzxKXU757RKI8hDuQ=="
</code>
我想要做的是将加密文本D0GBMGzxKXU757RKI8hDuQ ==
一个java服务器端代码，并得到解密的necrypted消息。
What I would like to do is pass the encrypted text "D0GBMGzxKXU757RKI8hDuQ== " to a java server side code and get the necrypted message decrypted.
我尝试了很多选项来解密crypto-js加密消息在java服务器端。
请在下面的我的代码在服务器端，应该对加密文本进行解密。
I tried many options to decrypt the crypto-js encrypted message at the java server side. Please find below my code at the server side that is supposed to do the decryption of the encrypted text.
<code>
public static String decrypt(String keyText,String encryptedText)
{
// generate key
Key key = new SecretKeySpec(keyText.getBytes(), "AES");
Cipher chiper = Cipher.getInstance("AES");
chiper.init(Cipher.DECRYPT_MODE, key);
byte[] decordedValue = new BASE64Decoder().decodeBuffer(encryptedText);
byte[] decValue = chiper.doFinal(decordedValue);
String decryptedValue = new String(decValue);
return decryptedValue;
}
</code>
我从以下代码调用java方法decrypt
I call the java method decrypt from below code
<code>
// performs decryption
public static void main(String[] args) throws Exception
{
String decryptedText = CrypterUtil.decrypt("user password","D0GBMGzxKXU757RKI8hDuQ==");
}
</code>
但是，当我运行java解密代码时，我得到以下异常
But i get the following exception when i run the java decrypt code
<code>
Exception in thread "main" java.security.InvalidKeyException: Invalid AES key length: 13 bytes
at com.sun.crypto.provider.AESCipher.engineGetKeySize(AESCipher.java:372)
at javax.crypto.Cipher.passCryptoPermCheck(Cipher.java:1052)
at javax.crypto.Cipher.checkCryptoPerm(Cipher.java:1010)
at javax.crypto.Cipher.implInit(Cipher.java:786)
at javax.crypto.Cipher.chooseProvider(Cipher.java:849)
at javax.crypto.Cipher.init(Cipher.java:1213)
at javax.crypto.Cipher.init(Cipher.java:1153)
at au.gov.daff.pems.model.utils.CrypterUtil.decrypt(CrypterUtil.java:34)
at au.gov.daff.pems.model.utils.CrypterUtil.main(CrypterUtil.java:47)
Process exited with exit code 1.
</code>
不知道我做错了什么？
Am not sure what am I doing wrong ?... What is the best way to encrypt a message using the crypto-js library so that it can be decripted else where using user keyed in password.
推荐答案
感谢Artjom B和其他人使用cryptojs库， Isaac Potoczny-Jones的迅速反应和建议。
Thanks to Artjom B and Isaac Potoczny-Jones for the prompt response and advice. I am giving the complete solution that worked for me below for the benefit of others.
Java代码在Java服务器端对cryptojs加密消息进行解密
Java code to do the decryption of the cryptojs encrypted message at the Java server side
public static void main(String args[]) throws Exception{
String password = "Secret Passphrase";
String salt = "222f51f42e744981cf7ce4240eeffc3a";
String iv = "2b69947b95f3a4bb422d1475b7dc90ea";
String encrypted = "CQVXTPM2ecOuZk+9Oy7OyGJ1M6d9rW2D/00Bzn9lkkehNra65nRZUkiCgA3qlpzL";
byte[] saltBytes = hexStringToByteArray(salt);
byte[] ivBytes = hexStringToByteArray(iv);
IvParameterSpec ivParameterSpec = new IvParameterSpec(ivBytes);
SecretKeySpec sKey = (SecretKeySpec) generateKeyFromPassword(password, saltBytes);
System.out.println( decrypt( encrypted , sKey ,ivParameterSpec));
}
public static SecretKey generateKeyFromPassword(String password, byte[] saltBytes) throws GeneralSecurityException {
KeySpec keySpec = new PBEKeySpec(password.toCharArray(), saltBytes, 100, 128);
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
SecretKey secretKey = keyFactory.generateSecret(keySpec);
return new SecretKeySpec(secretKey.getEncoded(), "AES");
}
public static byte[] hexStringToByteArray(String s) {
int len = s.length();
byte[] data = new byte[len / 2];
for (int i = 0; i < len; i += 2) {
data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) << 4)
+ Character.digit(s.charAt(i+1), 16));
}
return data;
}
public static String decrypt(String encryptedData, SecretKeySpec sKey, IvParameterSpec ivParameterSpec) throws Exception {
Cipher c = Cipher.getInstance("AES/CBC/PKCS5Padding");
c.init(Cipher.DECRYPT_MODE, sKey, ivParameterSpec);
byte[] decordedValue = new BASE64Decoder().decodeBuffer(encryptedData);
byte[] decValue = c.doFinal(decordedValue);
String decryptedValue = new String(decValue);
return decryptedValue;
}
cryptojs javascript代码可以在客户端进行加密和解密
The cryptojs javascript code that can do the encryption and decryption at the client side
function generateKey(){
var salt = CryptoJS.lib.WordArray.random(128/8);
var iv = CryptoJS.lib.WordArray.random(128/8);
console.log('salt '+ salt );
console.log('iv '+ iv );
var key128Bits100Iterations = CryptoJS.PBKDF2("Secret Passphrase", salt, { keySize: 128/32, iterations: 100 });
console.log( 'key128Bits100Iterations '+ key128Bits100Iterations);
var encrypted = CryptoJS.AES.encrypt("Message", key128Bits100Iterations, { iv: iv, mode: CryptoJS.mode.CBC, padding: CryptoJS.pad.Pkcs7 });
}
function decrypt(){
var salt = CryptoJS.enc.Hex.parse("4acfedc7dc72a9003a0dd721d7642bde");
var iv = CryptoJS.enc.Hex.parse("69135769514102d0eded589ff874cacd");
var encrypted = "PU7jfTmkyvD71ZtISKFcUQ==";
var key = CryptoJS.PBKDF2("Secret Passphrase", salt, { keySize: 128/32, iterations: 100 });
console.log( 'key '+ key);
var decrypt = CryptoJS.AES.decrypt(encrypted, key, { iv: iv, mode: CryptoJS.mode.CBC, padding: CryptoJS.pad.Pkcs7 });
var ddd = decrypt.toString(CryptoJS.enc.Utf8);
console.log('ddd '+ddd);
}
这篇关于如何在客户端使用crypto-js库加密消息，并在Java服务器解密的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
