如何使用CryptoStream(DESCryptoServiceProvider)解密时返回byte []

Question

这是一个初学者的问题,

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.

我们怎样才能获得返回的byte []？

这是代码.感谢您的任何帮助.

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[];

Answer 1

我也有这个问题,我创建了class一些函数来帮助我解决这个问题.

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();
                }
            }
        }

它ICryptoTransform是一个特殊的加密器或解密器.

该方法适用于对称算法

例如,加密和解密的方法如下:

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;
}