java - 如何使用 crypto-js 库在客户端加密消息并在 Java 服务器上解密

Question

背景:我正在开发的应用程序应该可以离线工作。我有一个 HTML5 页面，用户输入的数据是使用 crypto-js 库加密的。我希望将加密的消息发送到java网络服务器，然后在服务器端解密。

我在做什么我可以使用 Crypto-js 加密消息

<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>

我想做的是传递加密文本“D0GBMGzxKXU757RKI8hDuQ=="到 java 服务器端代码并​​解密加密消息。

我尝试了很多选项来解密 java 服务器端的 crypto-js 加密消息。请在下面找到我在服务器端的代码，该代码应该对加密文本进行解密。

<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>

我从下面的代码中调用java方法解密

<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解密代码时出现以下异常

<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>

不确定我做错了什么？...使用 crypto-js 库加密消息的最佳方法是什么，以便可以使用用户输入密码在其他地方对其进行解密。

Answer 1

感谢 Artjom B 和 Isaac Potoczny-Jones 的及时回复和建议。为了其他人的利益，我在下面给出了对我有用的完整解决方案。

在 Java 服务器端对 cryptojs 加密消息进行解密的 Java 代码

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;
}

可以在客户端进行加密和解密的cryptojs javascript代码

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);
}