加密到内存流，将其传递到文件流

问题描述

基于以下代码:

    static byte[] EncryptStringToBytes(string plainText, byte[] Key, byte[] IV)
    {
        // Check arguments.
        if (plainText == null || plainText.Length <= 0)
            throw new ArgumentNullException("plainText");
        if (Key == null || Key.Length <= 0)
            throw new ArgumentNullException("Key");
        if (IV == null || IV.Length <= 0)
            throw new ArgumentNullException("Key");
        byte[] encrypted;
        // Create an Rijndael object
        // with the specified key and IV.
        using (Rijndael rijAlg = Rijndael.Create())
        {
            rijAlg.Key = Key;
            rijAlg.IV = IV;

            // Create a decrytor to perform the stream transform.
            ICryptoTransform encryptor = rijAlg.CreateEncryptor(rijAlg.Key, rijAlg.IV);

            // Create the streams used for encryption.
            using (MemoryStream msEncrypt = new MemoryStream())
            {
                using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
                {
                    using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
                    {

                        //Write all data to the stream.
                        swEncrypt.Write(plainText);

                    }
                    encrypted = msEncrypt.ToArray();
                }
            }
        }


        // Return the encrypted bytes from the memory stream.
        return encrypted;

    }

我也需要将结果(加密)保存到文件中.我试图创建一个文件流并将CopyTo或WriteTo形成到该文件流的内存流，但是输出为空:

I need to get get the result (encrypted) saved to a file too. I tried to create a filestream and to CopyTo or WriteTo form the memorystream to the filestream but the output is empty:

    static byte[] EncryptStringToBytes(string plainText, byte[] Key, byte[] IV)
    {
        // Check arguments.
        if (plainText == null || plainText.Length <= 0)
            throw new ArgumentNullException("plainText");
        if (Key == null || Key.Length <= 0)
            throw new ArgumentNullException("Key");
        if (IV == null || IV.Length <= 0)
            throw new ArgumentNullException("Key");
        byte[] encrypted;
        // Create an Rijndael object
        // with the specified key and IV.
        using (Rijndael rijAlg = Rijndael.Create())
        {
            rijAlg.Key = Key;
            rijAlg.IV = IV;

            // Create a decrytor to perform the stream transform.
            ICryptoTransform encryptor = rijAlg.CreateEncryptor(rijAlg.Key, rijAlg.IV);

            // Create the streams used for encryption.
            using (MemoryStream msEncrypt = new MemoryStream())
            {
                using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
                {
                    using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
                    {

                        //Write all data to the stream.
                        swEncrypt.Write(plainText);

                    }
                    encrypted = msEncrypt.ToArray();
                    using (FileStream file = new FileStream("file.bin", FileMode.Create, System.IO.FileAccess.Write))
                    {
                        msEncrypt.CopyTo(file);
                    }
                }
            }
        }

推荐答案

我的评论全错了:-)

现在...我忘记了在这种情况下，在Dispose()上StreamWriter Dispose()是基础流(CryptoStream).

Now... I was forgetting that on Dispose(), the StreamWriter Dispose()s the underlying stream (the CryptoStream) in this case.

static byte[] EncryptStringToBytes(string plainText, byte[] Key, byte[] IV)
{
    // Check arguments.
    if (plainText == null || plainText.Length <= 0)
        throw new ArgumentNullException("plainText");
    if (Key == null || Key.Length <= 0)
        throw new ArgumentNullException("Key");
    if (IV == null || IV.Length <= 0)
        throw new ArgumentNullException("Key");
    byte[] encrypted;
    // Create an Rijndael object
    // with the specified key and IV.
    using (Rijndael rijAlg = Rijndael.Create())
    {
        rijAlg.Key = Key;
        rijAlg.IV = IV;

        // Create a decrytor to perform the stream transform.
        ICryptoTransform encryptor = rijAlg.CreateEncryptor(rijAlg.Key, rijAlg.IV);

        // Create the streams used for encryption.
        using (MemoryStream msEncrypt = new MemoryStream())
        {
            using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
            {
                using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
                {

                    //Write all data to the stream.
                    swEncrypt.Write(plainText);

                }

                encrypted = msEncrypt.ToArray();
            }

            using (FileStream file = new FileStream("file.bin", FileMode.Create, System.IO.FileAccess.Write))
            {
                file.Write(encrypted, 0, encrypted.Length);
            }
        }
    }
}

因此，我建议的修订只是将msEncrypt.ToArray()保持原样，并将byte[] encrypted写为byte[]

So my suggested revision is simply to leave the msEncrypt.ToArray() "as is" and write the byte[] encrypted as a byte[]

这篇关于加密到内存流，将其传递到文件流的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！