用Java加密并用C＃解密AES 256位

Question

1.我有java函数来加密xml文件并返回加密的字符串。

    /// Java Class 
    import java.security.Key;
    import javax.crypto.Cipher;
    import javax.crypto.spec.SecretKeySpec;
    import org.apache.commons.codec.binary.Base64;

    public class Crypt {

        public static String key = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
        public static byte[] key_Array = Base64.decodeBase64(key);

        public static String encrypt(String strToEncrypt)
        {       
            try
            {   
                //Cipher _Cipher = Cipher.getInstance("AES");
                //Cipher _Cipher = Cipher.getInstance("AES/ECB/PKCS5PADDING");
                //Cipher _Cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");      

                Key SecretKey = new SecretKeySpec(key_Array, "AES");

                Cipher _Cipher = Cipher.getInstance("AES");     
                _Cipher.init(Cipher.ENCRYPT_MODE, SecretKey);       

                return Base64.encodeBase64String(_Cipher.doFinal(strToEncrypt.getBytes()));     
            }
            catch (Exception e)
            {
                System.out.println("[Exception]:"+e.getMessage());
            }
            return null;
        }

        public static void main(String[] args) {        
            StringBuilder sb = new StringBuilder();
            sb.append("xml file string ...");

            String EncryptedString = encrypt(sb.toString());        
            System.out.println("[EncryptedString]:"+EncryptedString);
        }
    }

2.我有c＃函数可以解密通过java函数加密的消息。

    /// C# Function
    private static string Decrypt(string encryptedText)
    {
        RijndaelManaged aesEncryption = new RijndaelManaged();            
        aesEncryption.BlockSize = 256;
        //aesEncryption.KeySize = 256;
        //aesEncryption.Mode = CipherMode.CBC;
        //aesEncryption.Padding = PaddingMode.PKCS7;

        string keyStr = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
        //string ivStr = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";        

        byte[] keyArr = Convert.FromBase64String(keyStr);
        //byte[] ivArr = Convert.FromBase64String(ivStr);

        aesEncryption.Key = keyArr;
        //aesEncryption.IV = ivArr;

        ICryptoTransform decrypto = aesEncryption.CreateDecryptor();

        byte[] encryptedBytes = Convert.FromBase64CharArray(encryptedText.ToCharArray(), 0, encryptedText.Length);  
        byte[] decryptedData = decrypto.TransformFinalBlock(encryptedBytes, 0, encryptedBytes.Length); /// CryptographicException: Length of the data to decrypt is invalid.    
        return ASCIIEncoding.UTF8.GetString(decryptedData); 
    }

Java加密功能运行良好。但是问题是C＃函数，
当我解密时出现以下错误消息

CryptographicException: Length of the data to decrypt is invalid.

我通过使用下面的参考来搜索解决方案

1. Java中的AES加密和C＃中的解密
2. C＃/ Java | AES256加密/解密
3. C＃和Java中的加密/解密

但我仍然遇到同样的错误。有人可以给我建议吗？

更新

我只是更改我的C＃加密函数。以下是我的变更清单

1. 块大小为128
2. 密钥大小为256
3. IV尺寸至16

4. 密钥大小为32

   /// Updated decrypt function
   private static string Decrypt(string encryptedText)
   {
   RijndaelManaged aesEncryption = new RijndaelManaged();
   aesEncryption.BlockSize = 128;
   aesEncryption.KeySize = 256;
   

   //aesEncryption.Mode = CipherMode.CBC;
   aesEncryption.Padding = PaddingMode.None;
   
   string keyStr = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
   string ivStr = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
   
   byte[] ivArr = Convert.FromBase64String(ivStr);
   byte[] IVkey16BytesValue = new byte[16];
   Array.Copy(ivArr, IVkey16BytesValue, 16);
   
   byte[] keyArr = Convert.FromBase64String(keyStr);
   byte[] KeyArr32BytesValue = new byte[32];
   Array.Copy(keyArr, KeyArr32BytesValue, 32);
   
   aesEncryption.IV = IVkey16BytesValue;
   aesEncryption.Key = KeyArr32BytesValue;
   
   ICryptoTransform decrypto = aesEncryption.CreateDecryptor();
   
   byte[] encryptedBytes = Convert.FromBase64CharArray(encryptedText.ToCharArray(), 0, encryptedText.Length);
   byte[] decryptedData = decrypto.TransformFinalBlock(encryptedBytes, 0, encryptedBytes.Length); 
   return ASCIIEncoding.UTF8.GetString(decryptedData);
   

   }

此时，没有错误发生。但是我收到了我无法阅读的解密消息。

g:�\0�\td��Y\\符O����\rL��W�wHm�>f�\au����%��0��\ ..........

请让我再次得到您的建议。

Answer 1

我相信blockSize应该是128，keysize是256。keyStr应该是32个字符长，IVstr应该是16个字符长。这可能会有所帮助，因为它描述了为什么必须将128位用于块大小以及密钥大小可以是什么。csrc.nist.gov/publications/fips/fips197/fips-197.pdf

您在解密方法中具有此功能。

    aesEncryption.Padding = PaddingMode.None;

我相信您也需要将其放入加密方法中。

另外，为什么不对密钥和IV使用此方法。

    aes.Key = ASCIIEncoding.ASCII.GetBytes(keyStr); 
    aes.IV = ASCIIEncoding.ASCII.GetBytes(ivStr);