使用CryptoStream(DESCryptoServiceProvider)解密时如何返回byte [] [英] How to return byte[] when decrypt using CryptoStream (DESCryptoServiceProvider)

问题描述

这是一个初学者的问题，

This is a beginner question,

每次我在互联网上搜索时，使用 DESCryptoServiceProvider 函数解密总是返回一个字符串.

Every time I search on the internet, decrypt with DESCryptoServiceProvider function always returning a string.

我们如何获得 byte [] 作为退货?

How can we get byte[] for the return?

这是代码.谢谢您的帮助.

This is the code. Thank you for any help.

DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();
cryptoProvider.Padding = PaddingMode.None;
cryptoProvider.Mode = CipherMode.CBC;

MemoryStream memoryStream = new MemoryStream(value);
CryptoStream cryptoStream = new CryptoStream(memoryStream, 
cryptoProvider.CreateDecryptor(password, initVector), CryptoStreamMode.Read);
StreamReader reader = new StreamReader(cryptoStream);

return reader.ReadToEnd();            
//how to return byte[];

推荐答案

我也遇到了这个问题，并且我创建了一个 class 并提供了一些功能来帮助我解决此问题.

I had this problem too, and I created a class with some functions to help me with this issues.

执行加密的功能是:

private byte[] PerformCryptography(ICryptoTransform cryptoTransform, byte[] data)
        {
            using (var memoryStream = new MemoryStream())
            {
                using (var cryptoStream = new CryptoStream(memoryStream, cryptoTransform, CryptoStreamMode.Write))
                {
                    cryptoStream.Write(data, 0, data.Length);
                    cryptoStream.FlushFinalBlock();
                    return memoryStream.ToArray();
                }
            }
        }

ICryptoTransform 是特定的加密器或解密器.

The ICryptoTransform is either a spezific encryptor or decryptor.

此方法适用于对称算法

例如，加密和解密的方法如下:

Just for example, the methods for encryption and decryption look like:

public byte[] Encrypt(byte[] data)
{
    if (CanPerformCryptography(data))
    {
        using (var encryptor = _algorithm.CreateEncryptor(_key, _iv))
        {
            return PerformCryptography(encryptor, data);
        }
    }
    return data;
}

public byte[] Decrypt(byte[] data)
{
    if (CanPerformCryptography(data))
    {
        using (var decryptor = _algorithm.CreateDecryptor(_key, _iv))
        {
            return PerformCryptography(decryptor, data);
        }
    }
    return data;
}

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