C#加密C# at CryptoStream.close()

Question

我正试着用C#写一个En/Decrypter。正如标题所示，我在CryptoStream.close()获得了一个CryptoStream.close()。我还没找到解决办法。希望有人能帮上忙。

public static string viaRijndael(byte[] input, string key, string iV)
    {
        Rijndael RijCrypt = Rijndael.Create();

        RijCrypt.Key = System.Text.Encoding.UTF8.GetBytes(Tools.GetMD5Hash(Tools.GetMD5Hash(key))); 

        RijCrypt.IV = System.Text.Encoding.UTF8.GetBytes(Tools.GetMD5Hash(Tools.GetMD5Hash(key)).Substring(0, 16));

        MemoryStream ms = new MemoryStream();
        CryptoStream cs = new CryptoStream(ms, RijCrypt.CreateDecryptor(), CryptoStreamMode.Write); 

        cs.Write(input, 0, input.Length); 
        cs.Close(); // System.Security.Cryptography.CryptographicException

        byte[] DecryptedBytes = ms.ToArray();

        return System.Text.Encoding.UTF8.GetString(DecryptedBytes);
    }

Answer 1

MSDN Stream.Close文档说：

“此方法调用Dispose，指定true以释放所有资源。您不必专门调用Close方法。相反，要确保每个Stream对象都被正确地处理。您可以在using块(或在Visual中使用块)中声明Stream对象，以确保流及其所有资源都被释放，或者您可以显式调用Dispose方法。”

因此，我建议尝试下面这样的方法来处理您的流：

public static string viaRijndael(byte[] input, string key, string iV)
{
    byte[] decryptedBytes;

    using (Rijndael rijCrypt = Rijndael.Create())
    {
        rijCrypt.Key = System.Text.Encoding.UTF8.GetBytes(Tools.GetMD5Hash(Tools.GetMD5Hash(key))); 

        rijCrypt.IV = System.Text.Encoding.UTF8.GetBytes(Tools.GetMD5Hash(Tools.GetMD5Hash(key)).Substring(0, 16));

        using (MemoryStream ms = new MemoryStream())
        {
            using (CryptoStream cs = new CryptoStream(ms, rijCrypt.CreateDecryptor(), CryptoStreamMode.Write))
            {
                cs.Write(input, 0, input.Length); 
            }

            decrpytedBytes = ms.ToArray();
        }
    }

    return System.Text.Encoding.UTF8.GetString(decryptedBytes);
}

所有这些以及更多内容将在CryptoStream类的MSDN上详细解释。