C# 填充无效，无法在C中删除#

我正在制作一个具有加密和解密功能的程序，但我遇到了填充无效且无法删除的问题

这是我的密码：

加密

解密

---

错误的过程是在第cryptoStream行进行递减。关闭

您需要设置加密和解密的填充

symmetricKey.Padding=PaddingMode.PKCS7;

加密数据时还刷新最后一个块

我测试了以下代码，效果很好：

public static string Encrypt(string plainText, string passPhrase)
    {
        byte[] initVectorBytes = Encoding.UTF8.GetBytes("pemgail9uzpgzl88");
        byte[] plainTextBytes = Encoding.UTF8.GetBytes(plainText);
        PasswordDeriveBytes password = new PasswordDeriveBytes(passPhrase, null);
        byte[] keyBytes = password.GetBytes(256 / 8);
        RijndaelManaged symmetricKey = new RijndaelManaged();
        symmetricKey.Mode = CipherMode.CBC;
        symmetricKey.Padding = PaddingMode.PKCS7;
        ICryptoTransform encryptor = symmetricKey.CreateEncryptor(keyBytes, initVectorBytes);
        MemoryStream memoryStream = new MemoryStream();
        CryptoStream cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write);
        cryptoStream.Write(plainTextBytes, 0, plainTextBytes.Length);
        cryptoStream.FlushFinalBlock();
        byte[] cipherTextBytes = memoryStream.ToArray();
        memoryStream.Close();
        cryptoStream.Close();
        string cipherText = Convert.ToBase64String(cipherTextBytes);
        return cipherText;
    }

    public static string Decrypt(string cipherText, string passPhrase)
    {
        byte[] initVectorBytes = Encoding.UTF8.GetBytes("pemgail9uzpgzl88");
        byte[] cipherTextBytes = Convert.FromBase64String(cipherText);
        PasswordDeriveBytes password = new PasswordDeriveBytes(passPhrase, null);
        byte[] keyBytes = password.GetBytes(256 / 8);
        RijndaelManaged symmetricKey = new RijndaelManaged();
        symmetricKey.Mode = CipherMode.CBC;
        symmetricKey.Padding = PaddingMode.PKCS7;
        ICryptoTransform decryptor = symmetricKey.CreateDecryptor(keyBytes, initVectorBytes);
        MemoryStream memoryStream = new MemoryStream(cipherTextBytes);
        CryptoStream cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read);
        byte[] plainTextBytes = new byte[cipherTextBytes.Length];
        int decryptedByteCount = cryptoStream.Read(plainTextBytes, 0, plainTextBytes.Length);
        memoryStream.Close();
        cryptoStream.Close();
        string plainText = Encoding.UTF8.GetString(plainTextBytes, 0, decryptedByteCount);
        return plainText;
    }

我已经为加密和解密设置了填充，刷新了最后一个块。

---

尝试代码。

这里有一些问题，例如，您以错误的顺序关闭流。使用

using（）{}

块修复该问题。关闭MemoryStream后从中获取缓冲区。但看起来它仍然可以工作。再加上一个小例子，看看你怎么称呼它，我想明文的长度可能是一个因素。还要指定.NET版本。@Henkholtman您能解释一下吗？我不明白我使用的是.NET Framework 4.0首先关闭加密流，然后关闭MemStream，然后使用ToArray（）获取字节我已经对richTextBox中的文本进行了加密，所以这可能是问题的原因吗？@whornary当您获取正常文本时，这应该无关紧要。但是我们不能在你的电脑上查看，所以开始写吧。它只需要一个控制台应用程序和最多5条额外的线路。

symmetricKey.Padding=PaddingMode.PKCS7;

public static string Encrypt(string plainText, string passPhrase)
    {
        byte[] initVectorBytes = Encoding.UTF8.GetBytes("pemgail9uzpgzl88");
        byte[] plainTextBytes = Encoding.UTF8.GetBytes(plainText);
        PasswordDeriveBytes password = new PasswordDeriveBytes(passPhrase, null);
        byte[] keyBytes = password.GetBytes(256 / 8);
        RijndaelManaged symmetricKey = new RijndaelManaged();
        symmetricKey.Mode = CipherMode.CBC;
        symmetricKey.Padding = PaddingMode.PKCS7;
        ICryptoTransform encryptor = symmetricKey.CreateEncryptor(keyBytes, initVectorBytes);
        MemoryStream memoryStream = new MemoryStream();
        CryptoStream cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write);
        cryptoStream.Write(plainTextBytes, 0, plainTextBytes.Length);
        cryptoStream.FlushFinalBlock();
        byte[] cipherTextBytes = memoryStream.ToArray();
        memoryStream.Close();
        cryptoStream.Close();
        string cipherText = Convert.ToBase64String(cipherTextBytes);
        return cipherText;
    }

    public static string Decrypt(string cipherText, string passPhrase)
    {
        byte[] initVectorBytes = Encoding.UTF8.GetBytes("pemgail9uzpgzl88");
        byte[] cipherTextBytes = Convert.FromBase64String(cipherText);
        PasswordDeriveBytes password = new PasswordDeriveBytes(passPhrase, null);
        byte[] keyBytes = password.GetBytes(256 / 8);
        RijndaelManaged symmetricKey = new RijndaelManaged();
        symmetricKey.Mode = CipherMode.CBC;
        symmetricKey.Padding = PaddingMode.PKCS7;
        ICryptoTransform decryptor = symmetricKey.CreateDecryptor(keyBytes, initVectorBytes);
        MemoryStream memoryStream = new MemoryStream(cipherTextBytes);
        CryptoStream cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read);
        byte[] plainTextBytes = new byte[cipherTextBytes.Length];
        int decryptedByteCount = cryptoStream.Read(plainTextBytes, 0, plainTextBytes.Length);
        memoryStream.Close();
        cryptoStream.Close();
        string plainText = Encoding.UTF8.GetString(plainTextBytes, 0, decryptedByteCount);
        return plainText;
    }