Question

在将.net解密代码转换为java时，我得到了异常

Exception in thread "main" java.lang.IllegalArgumentException: Missing argument
    at javax.crypto.spec.SecretKeySpec.<init>(DashoA13*..)
    at com.motorola.gst.DecryptTest3.Decrypt(DecryptTest3.java:90)
    at com.motorola.gst.DecryptTest3.main(DecryptTest3.java:36)

我是第一次尝试解密并将.net代码转换为java

这是我尝试转换的.net代码

 private static string Decrypt(string encryptedText, string completeEncodedKey, int keySize)
        {
            RijndaelManaged aesEncryption = new RijndaelManaged();
            aesEncryption.KeySize = keySize;
            aesEncryption.BlockSize = 128;
            aesEncryption.Mode = CipherMode.CBC;
            aesEncryption.Padding = PaddingMode.PKCS7;
            aesEncryption.IV = Convert.FromBase64String(ASCIIEncoding.UTF8.GetString(Convert.FromBase64String(completeEncodedKey)).Split(',')[0]);
            aesEncryption.Key = Convert.FromBase64String(ASCIIEncoding.UTF8.GetString(Convert.FromBase64String(completeEncodedKey)).Split(',')[1]);
            ICryptoTransform decrypto = aesEncryption.CreateDecryptor();
            byte[] encryptedBytes = Convert.FromBase64CharArray(encryptedText.ToCharArray(), 0, encryptedText.Length);
            return ASCIIEncoding.UTF8.GetString(decrypto.TransformFinalBlock(encryptedBytes, 0, encryptedBytes.Length));
        }

我浏览了很多帖子，发现Decrypting bytes encrypted by .NET's RijndaelManaged using Java与我的案例更相关。

我按照这些并将我的解密函数写为::

private static String Decrypt(String encryptedText, String completeEncodedKey,int keySize) {
        //get completeEncodedKey in bytes and then to string
        String decodedcompleteEncodedKey = StringUtils.newStringUtf8(Base64.decodeBase64(completeEncodedKey));
        System.out.println("Decoded completeEncodedKey Key ::  "+decodedcompleteEncodedKey);
        int indexComma = decodedcompleteEncodedKey.indexOf(',');
        System.out.println("COmma Index :: "+indexComma);
        String IV = decodedcompleteEncodedKey.substring(0, indexComma);
        String Key = decodedcompleteEncodedKey.substring(indexComma+1,decodedcompleteEncodedKey.length());
        System.out.println("IV::: "+IV);
        System.out.println("Key::: "+Key);


    byte[] sessionKey = null; 
    byte[] iv = null ; 
    byte[] plaintext = encryptedText.getBytes(); 
    Cipher cipher = null;
    try {
        cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(sessionKey, "AES"), new IvParameterSpec(iv));
        byte[] ciphertext = cipher.doFinal(plaintext);
    } catch (IllegalBlockSizeException e) {
        System.out.println("IllegalBlockSizeException");
        e.printStackTrace();
    } catch (BadPaddingException e) {
        System.out.println("BadPaddingException");
        e.printStackTrace();
    } catch (InvalidKeyException e) {
        System.out.println("InvalidKeyException");
        e.printStackTrace();
    } catch (InvalidAlgorithmParameterException e) {
        System.out.println("InvalidAlgorithmParameterException");
        e.printStackTrace();
    } catch (NoSuchAlgorithmException e) {
        System.out.println("NoSuchAlgorithmException");
        e.printStackTrace();
    } catch (NoSuchPaddingException e) {
        System.out.println("NoSuchPaddingException");
        e.printStackTrace();
    }
    return null;
}

但是现在我在线程＆＃34; main＆＃34;中得到了Exception。 java.lang.IllegalArgumentException：缺少参数。

任何人都可以帮我修复这些错误。任何帮助，将不胜感激。谢谢！

Answer 1

对我来说，问题是用new SecretKeySpec(sessionKey, "AES")调用了sessionKey = null。

在java中转换RijndaelManaged时缺少参数

1 个答案: