c# - 使用 AES 解密时输入数据不是完整的 block

Question

我正在尝试加密来自 oracle 的数据，然后使用 C# 对其进行解密

到目前为止，我已经成功地编写了一个代码来加密 C# 和 Oracle 中的数据，并且我得到了匹配的结果

我试图在 C# 中解密数据，但出现错误:“输入数据不是一个完整的 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 中执行第二个查询后的结果是:tuiPaBhVhEVvv4+nmbEMoQ==

用于加密/解密的 C# 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));
        }
    }
}

运行程序加密后的结果为:tuiPaBhVhEVvv4+nmbEMoQ==但是解密抛出异常

提前致谢

Answer 1

谢谢 Damien，我已经按照你的提示设法解决了这个问题，并最终让代码工作 + 得到了我加密的相同字符串

这里是完成所需编辑后的新代码

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!