询问AES解密后字符串尾部有乱码问题

Question

 /// <summary>
        /// AES加密
        /// </summary>
        /// <param name="str">要加密字符串</param>
        /// <returns>返回加密后字符串</returns>
        public static string Encrypt_AES(string str, string Key)
        {
            //分组加密算法
            SymmetricAlgorithm des = Rijndael.Create();
            byte[] inputByteArray = Encoding.UTF8.GetBytes(str);//得到需要加密的字节数组 
            //设置密钥及密钥向量
            des.Key = Encoding.UTF8.GetBytes(Key);
            des.IV = Encoding.UTF8.GetBytes(Key);
            des.Mode = System.Security.Cryptography.CipherMode.CBC;
            des.Padding = System.Security.Cryptography.PaddingMode.PKCS7;
            des.BlockSize = 128;            using (MemoryStream ms = new MemoryStream())
            {
                using (CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(des.Key, des.IV), CryptoStreamMode.Write))
                {
                    cs.Write(inputByteArray, 0, inputByteArray.Length);
                    cs.FlushFinalBlock();
                    cs.Close();
                    ms.Close();
                }                return Convert.ToBase64String(ms.ToArray());
            }        }        /// <summary>
        /// AES解密
        /// </summary>
        /// <param name="str">要解密字符串</param>
        /// <returns>返回解密后字符串</returns>
        public static string Decrypt_AES(string str, string Key)
        {
            byte[] inputByteArray = Convert.FromBase64String(str);            SymmetricAlgorithm des = Rijndael.Create();
            des.Key = Encoding.UTF8.GetBytes(Key);
            des.BlockSize = 128;
            des.IV = Encoding.UTF8.GetBytes(Key);
            des.Mode = System.Security.Cryptography.CipherMode.CBC;
            des.Padding = System.Security.Cryptography.PaddingMode.PKCS7;            using (MemoryStream ms = new MemoryStream(inputByteArray))
            {
                using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(des.Key, des.IV), CryptoStreamMode.Write))
                {
                    cs.Write(inputByteArray, 0, inputByteArray.Length);
                    cs.FlushFinalBlock();
                    cs.Close();
                    ms.Close();
                }                return Encoding.UTF8.GetString(ms.ToArray());
            }
        }
以上是加密解密方法，对字符串“abc”加密再解密后得到的结果是“abc��zҏ�ZO=>�E[”这是什么情况？查了半天也没解决，请帮忙，谢谢，盼复

Answer 1

#region 数据加密（AES）
        /// <summary>
        /// 加密数据
        /// </summary>
        /// <param name="input">加密前的字符串</param>
        /// <returns>加密后的字符串</returns>
        public static string Encrypt(string input, string saltValue, string pwdValue)
        {
            byte[] data = System.Text.UTF8Encoding.UTF8.GetBytes(input);
            byte[] salt = System.Text.UTF8Encoding.UTF8.GetBytes(saltValue);            // AesManaged - 高级加密标准(AES) 对称算法的管理类
            System.Security.Cryptography.AesManaged aes = new System.Security.Cryptography.AesManaged();            // 通过 密码 和 salt 派生密钥
            System.Security.Cryptography.Rfc2898DeriveBytes rfc = new System.Security.Cryptography.Rfc2898DeriveBytes(pwdValue, salt);            aes.BlockSize = aes.LegalBlockSizes[0].MaxSize;
            aes.KeySize = aes.LegalKeySizes[0].MaxSize;
            aes.Key = rfc.GetBytes(aes.KeySize / 8);
            aes.IV = rfc.GetBytes(aes.BlockSize / 8);            // 用当前的 Key 属性和初始化向量 IV 创建对称加密器对象
            System.Security.Cryptography.ICryptoTransform encryptTransform = aes.CreateEncryptor();            // 加密后的输出流
            System.IO.MemoryStream encryptStream = new System.IO.MemoryStream();            // 将加密后的目标流（encryptStream）与加密转换（encryptTransform）相连接
            System.Security.Cryptography.CryptoStream encryptor = new System.Security.Cryptography.CryptoStream
                (encryptStream, encryptTransform, System.Security.Cryptography.CryptoStreamMode.Write);            // 将一个字节序列写入当前 CryptoStream （完成加密的过程）
            encryptor.Write(data, 0, data.Length);
            encryptor.Close();            // 将加密后所得到的流转换成字节数组，再用Base64编码将其转换为字符串
            string encryptedString = Convert.ToBase64String(encryptStream.ToArray());            return encryptedString;
        }
        #endregion        #region 数据解密（AES）
        /// <summary>
        /// 解密数据
        /// </summary>
        /// <param name="input">解密前的字符串</param>
        /// <returns>解密后的字符串</returns>
        public static string Decrypt(string input, string saltValue, string pwdValue)
        {
            byte[] encryptBytes = Convert.FromBase64String(input);
            byte[] salt = Encoding.UTF8.GetBytes(saltValue);            System.Security.Cryptography.AesManaged aes = new System.Security.Cryptography.AesManaged();            System.Security.Cryptography.Rfc2898DeriveBytes rfc = new System.Security.Cryptography.Rfc2898DeriveBytes(pwdValue, salt);            aes.BlockSize = aes.LegalBlockSizes[0].MaxSize;
            aes.KeySize = aes.LegalKeySizes[0].MaxSize;
            aes.Key = rfc.GetBytes(aes.KeySize / 8);
            aes.IV = rfc.GetBytes(aes.BlockSize / 8);            // 用当前的 Key 属性和初始化向量 IV 创建对称解密器对象
            System.Security.Cryptography.ICryptoTransform decryptTransform = aes.CreateDecryptor();            // 解密后的输出流
            MemoryStream decryptStream = new MemoryStream();            // 将解密后的目标流（decryptStream）与解密转换（decryptTransform）相连接
            System.Security.Cryptography.CryptoStream decryptor = new System.Security.Cryptography.CryptoStream(
                decryptStream, decryptTransform, System.Security.Cryptography.CryptoStreamMode.Write);            // 将一个字节序列写入当前 CryptoStream （完成解密的过程）
            decryptor.Write(encryptBytes, 0, encryptBytes.Length);
            decryptor.Close();            // 将解密后所得到的流转换为字符串
            byte[] decryptBytes = decryptStream.ToArray();
            string decryptedString = UTF8Encoding.UTF8.GetString(decryptBytes, 0, decryptBytes.Length);
            return decryptedString;
        }        #endregion

Answer 2

调用
string ss = AESEncrypt("abc");//RvqaW9wm463knMhW5Vq2Gw==
                string tt = AESDecrypt("RvqaW9wm463knMhW5Vq2Gw==");//abc
/// <summary>
    /// 获取密钥
    /// </summary>
    private static string Key
    {
        get
        {
            return "abcdef1234567890";    ////必须是16位
        }
    }    //默认密钥向量 
    private static byte[] _key1 = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF, 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };    /// <summary>
    /// AES加密算法
    /// </summary>
    /// <param name="plainText">明文字符串</param>
    /// <returns>将加密后的密文转换为Base64编码，以便显示</returns>
    public static string AESEncrypt(string plainText)
    {
        //分组加密算法
        SymmetricAlgorithm des = Rijndael.Create();
        byte[] inputByteArray = Encoding.UTF8.GetBytes(plainText);//得到需要加密的字节数组 
        //设置密钥及密钥向量
        des.Key = Encoding.UTF8.GetBytes(Key);
        des.IV = _key1;
        byte[] cipherBytes = null;
        using (MemoryStream ms = new MemoryStream())
        {
            using (CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write))
            {
                cs.Write(inputByteArray, 0, inputByteArray.Length);
                cs.FlushFinalBlock();
                cipherBytes = ms.ToArray();//得到加密后的字节数组
                cs.Close();
                ms.Close();
            }
        }
        return Convert.ToBase64String(cipherBytes);
    }    /// <summary>
    /// AES解密
    /// </summary>
    /// <param name="cipherText">密文字符串</param>
    /// <returns>返回解密后的明文字符串</returns>
    public static string AESDecrypt(string showText)
    {
        byte[] cipherText = Convert.FromBase64String(showText);        SymmetricAlgorithm des = Rijndael.Create();
        des.Key = Encoding.UTF8.GetBytes(Key);
        des.IV = _key1;
        byte[] decryptBytes = new byte[cipherText.Length];
        using (MemoryStream ms = new MemoryStream(cipherText))
        {
            using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Read))
            {
                cs.Read(decryptBytes, 0, decryptBytes.Length);
                cs.Close();
                ms.Close();
            }
        }
        return Encoding.UTF8.GetString(decryptBytes).Replace("\0", "");   ///将字符串后尾的'\0'去掉
    }