c#-4.0 – 另一个“要解密的数据长度无效.”错误

我确信我缺少一些基本的东西,但我看不出它是什么.

我在加密和解密时使用相同的密钥和IV.我在加密和解密时添加了FlushFinalBlock()调用.我甚至试图设置encryptStream.Position = 0,但是抛出了ObjectDisposedException.

我创建了一个控制台应用程序来说明问题.代码完整如下：

using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;

namespace Crypto
{
    class Program
    {
        static void Main(string[] args)
        {
            _CryptoString = AESStringEncryption(CRYPTO_STRING);
            _CryptoString = AESStringDecryption(_CryptoString);
        }

        private const string CRYPTO_STRING = "The quick brown fox jumped over the lazy dog.";

        private static byte[] _KY = { 47,53,94,65,243,197,42,80,125,255,144,41,130,76,2,142,43,1,120,124,248,232,139,170,52,4,17,60,174 };
        private static byte[] _VI = { 68,157,47,99,8,174,169,119,218,30,42 };

        private static string _CryptoString;

        /// <summary>
        /// Applies .NET Framework AES (Advanced Encryption Standard) Level encryption to the provided string parameter.
        /// Utilizies the UTF8 encoding stardard for the conversion from string to byte[].
        /// </summary>
        public static string AESStringEncryption(string unencryptedString)
        {
            byte[] unencryptedBytes = Encoding.UTF8.GetBytes(unencryptedString);
            byte[] encryptedBytes = AESByteArrayEncryption(unencryptedBytes);
            string encryptedString = Encoding.UTF8.GetString(encryptedBytes);

            return encryptedString;
        }

        /// <summary>
        /// Applies .NET Framework AES (Advanced Encryption Standard) Level decryption to the provided string parameter.
        /// Utilizies the UTF8 encoding stardard for the conversion from byte[] to string.
        /// </summary>
        public static string AESStringDecryption(string encryptedString)
        {
            byte[] encryptedBytes = Encoding.UTF8.GetBytes(encryptedString);
            byte[] decryptedBytes = AESByteArrayDecryption(encryptedBytes);
            string decryptedString = Encoding.UTF8.GetString(decryptedBytes);

            return decryptedString;
        }

        /// <summary>
        /// Applies .NET Framework AES (Advanced Encryption Standard) Level encryption to the provided byte array parameter.
        /// </summary>
        public static byte[] AESByteArrayEncryption(byte[] unencryptedBytes)
        {
            using (var rm = new RijndaelManaged())
            {
                var encryptor = rm.CreateEncryptor(_KY,_VI);
                using (var encryptStream = new MemoryStream())
                {
                    using (var cryptoStream = new CryptoStream(encryptStream,encryptor,CryptoStreamMode.Write))
                    {
                        cryptoStream.Write(unencryptedBytes,unencryptedBytes.Length);
                        cryptoStream.FlushFinalBlock();
                    }

                    //encryptStream.Position = 0;

                    byte[] encryptedBytes = encryptStream.ToArray();

                    return encryptedBytes;
                }
            }
        }

        /// <summary>
        /// Applies .NET Framework AES (Advanced Encryption Standard) Level decryption to the provided byte array parameter.
        /// </summary>
        public static byte[] AESByteArrayDecryption(byte[] encryptedBytes)
        {
            using (var rm = new RijndaelManaged())
            {
                var decryptor = rm.CreateDecryptor(_KY,_VI);
                using (var decryptStream = new MemoryStream())
                {
                    using (var cryptoStream = new CryptoStream(decryptStream,decryptor,CryptoStreamMode.Write))
                    {
                        cryptoStream.Write(encryptedBytes,encryptedBytes.Length);
                        cryptoStream.FlushFinalBlock();
                    }

                    //decryptStream.Position = 0;

                    byte[] decryptedBytes = decryptStream.ToArray();

                    return decryptedBytes;
                }
            }
        }
    }
}