使用AES解密时，输入数据不是完整的块 [英] The input data is not a complete block when decrypting using AES

问题描述

我正在尝试从oracle加密数据，然后使用C#对其解密

I am trying to encrypt data from oracle, then decrypt it using C#

到目前为止，我设法编写了对C#和Oracle中的数据进行加密的代码，并且得到了匹配的结果

so far, I managed to write a code that encrypts the data in both C# and Oracle, and I got matched results

我正在尝试解密C#中的数据，但出现错误:输入数据不是完整的块"

I am trying to Decrypt the data in C# but I get the error : "The Input data is not a complete block"

Oracle加密:

SELECT DBMS_CRYPTO.encrypt (RAWTOHEX ('Hello World!'),
                                       6 + 256 + 12288,
                                       RAWTOHEX ('4566456678997899'),
                                       RAWTOHEX ('1234123456785678')) /*AES128 = 6, CHAINCBC = 256, PAD ZERO = 12288*/
  FROM   DUAL;
/

SELECT   UTL_RAW.cast_to_varchar2(UTL_ENCODE.base64_encode('B6E88F68185584456FBF8FA799B10CA1'))
  FROM   DUAL;

在Oracle中执行第二次查询后的结果是:tuiPaBhVhEVvv4 + nmbEMoQ ==

The result after executing the 2nd query in Oracle is : tuiPaBhVhEVvv4+nmbEMoQ==

C#加密/解密类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.OleDb;
using System.Security.Cryptography;
using System.Diagnostics;

namespace ConsoleApplication3
{
    class AesTest {
        private const string AesIV = @"1234123456785678"; //@"d8zOcR9K9xqpl8Cd";//@"!QAZ2WSX#EDC4RFV";
        private const string AesKey = @"4566456678997899"; //@"NDsVwQwRbwbuYDcX2PRGwNewMediaCod"; //@"5TGB&YHN7UJM(IK<";

        static void Main(string[] args)
        {
            string src = "Hello World!";
            string x = AesTest.EncryptUsingCBC(src);
            System.Console.WriteLine("Text to Encrypt: " + src);
            System.Console.WriteLine("CSharp: " + x);
            string w = AesTest.DecryptUsingCBC(x);
            System.Console.WriteLine("Decrypt CSharp: " + w);
            System.Console.ReadLine();
        }

        public static byte[] EncryptToBytesUsingCBC(string toEncrypt) {
            byte[] src = Encoding.UTF8.GetBytes(toEncrypt);
            byte[] dest = new byte[src.Length];
            using (var aes = new AesCryptoServiceProvider()) {
                aes.BlockSize = 128;
                aes.KeySize = 128;
                aes.IV = Encoding.UTF8.GetBytes(AesIV);
                aes.Key = Encoding.UTF8.GetBytes(AesKey);
                aes.Mode = CipherMode.CBC;
                aes.Padding = PaddingMode.Zeros;
                // encryption
                using (ICryptoTransform encrypt = aes.CreateEncryptor(aes.Key, aes.IV)) {
                    return encrypt.TransformFinalBlock(src, 0, src.Length);
                }
            }
        }

        public static string EncryptUsingCBC(string toEncrypt) {
            return Convert.ToBase64String(EncryptToBytesUsingCBC(toEncrypt));
        }

        public static byte[] DecryptToBytesUsingCBC(string toDecrypt)
        {
            byte[] src = Encoding.UTF8.GetBytes(toDecrypt);
            byte[] dest = new byte[src.Length];
            using (var aes = new AesCryptoServiceProvider())
            {
                aes.BlockSize = 128;
                aes.KeySize = 128;
                aes.IV = Encoding.UTF8.GetBytes(AesIV);
                aes.Key = Encoding.UTF8.GetBytes(AesKey);
                aes.Mode = CipherMode.CBC;
                aes.Padding = PaddingMode.Zeros;
                // decryption
                using (ICryptoTransform decrypt = aes.CreateDecryptor(aes.Key, aes.IV))
                {
                    byte[] decryptedText = decrypt.TransformFinalBlock(src, 0, src.Length);
                    return decryptedText;
                }
            }
        }
        public static string DecryptUsingCBC(string toDecrypt)
        {
            return Convert.ToBase64String(DecryptToBytesUsingCBC(toDecrypt));
        }
    }
}

运行加密程序后的结果是:tuiPaBhVhEVvv4 + nmbEMoQ ==但解密会引发异常

The result after running the program for encryption is : tuiPaBhVhEVvv4+nmbEMoQ== but the decryption throws the exception

预先感谢

推荐答案

感谢达米恩，我已经按照您的提示进行操作，并设法解决了该问题，最后使代码可以正常工作，并且使用了我加密的相同字符串

Thanks Damien, I have followed your tips and managed to solve the issue and finally got the code to work + got the same string i encrypted

在进行了必要的修改后，这是新代码

here is the new code after doing the edits required

public static string DecryptToBytesUsingCBC(byte[] toDecrypt)
        {
            byte[] src = toDecrypt;
            byte[] dest = new byte[src.Length];
            using (var aes = new AesCryptoServiceProvider())
            {
                aes.BlockSize = 128;
                aes.KeySize = 128;
                aes.IV = Encoding.UTF8.GetBytes(AesIV);
                aes.Key = Encoding.UTF8.GetBytes(AesKey);
                aes.Mode = CipherMode.CBC;
                aes.Padding = PaddingMode.Zeros;
                // decryption
                using (ICryptoTransform decrypt = aes.CreateDecryptor(aes.Key, aes.IV))
                {
                    byte[] decryptedText = decrypt.TransformFinalBlock(src, 0, src.Length);

                    return Encoding.UTF8.GetString(decryptedText);
                }
            }
        }
        public static string DecryptUsingCBC(string toDecrypt)
        {

            return DecryptToBytesUsingCBC(Convert.FromBase64String(toDecrypt));
        }

解密后的结果是:Hello World！

Result after decryption is : Hello World!

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