多层流读/写中的c#加密

有从多个数据层创建的文件:

    //input is not always the same, but the structure is, so for example there might be h4 and h5, but I will know that, so that is not the problem
    private void generalizationofwrittendata(string filename, int someint, int chunks, string outputfilename, ICryptoTransform crypt, byte[] somedata, int h1, int h2, int h3)
    {
        using (FileStream fs = new FileStream(outputfilename, FileMode.Create, FileAccess.Write))
        {
            using (BinaryWriter w = new BinaryWriter(fs, Encoding.ASCII))
            {
                //writing some data with binary writer
                w.Write(h1);
                w.Write(h2);
                w.Write(h3);
                using (FileStream fsIn = File.OpenRead(filename))
                {
                    using (CryptoStream cs = new CryptoStream(fs, crypt, CryptoStreamMode.Write))
                    {
                        //writing the rest of data with crypto stream
                        cs.Write(somedata, 0, somedata.Length);
                        byte[] chunk = new byte[chunks];
                        int bytesRead = 0;
                        while ((bytesRead = fsIn.Read(chunk, 0, chunks)) > 0)
                        {
                            cs.Write(chunk, 0, bytesRead);
                        }
                    }
                }
            }
        }
    }

private void test(string filename, int someint, int chunks, string outputfilename, ICryptoTransform crypt)
    {
        using (FileStream fs = new FileStream(filename, FileMode.Open, FileAccess.Read))
        {
            using (BinaryReader br = new BinaryReader(fs, Encoding.ASCII))
            {
                //reading some not encrypted data
                int h1 = br.ReadInt32();
                int h2 = br.ReadInt32();
                int h3 = br.ReadInt32();
                using (CryptoStream cs = new CryptoStream(fs, crypt, CryptoStreamMode.Read))
                {
                    using (BinaryReader br2 = new BinaryReader(cs, Encoding.ASCII))
                    {
                        //reading some encrypted data
                        byte[] somedata = br2.ReadBytes(someint);
                        //writing the rest of the data to file
                        using (FileStream fsOut = new FileStream(outputfilename, FileMode.Create))
                        {
                            byte[] chunk = new byte[chunks];
                            int bytesRead = 0;
                            while ((bytesRead = cs.Read(chunk, 0, chunks)) > 0)
                            {
                                fsOut.Write(chunk, 0, bytesRead);
                            }
                        }
                    }
                }
            }
        }
    }

这种方法根本不起作用。只有h1、h2、h3可以通过这种方式接收回来。有些数据会不同,写入的文件会比原始数据长,这让我认为问题在于加密流+二进制读取器从文件开始读取。 也许你会建议我使用 MemoryStream 我找到的唯一其他解决方案是 SubStream 但不幸的是,当我在“fs”和“cs”之间使用它时,它导致了错误的“somedata”,并且生成的文件也有错误的数据。

也许有一种方法可以使用 Memory-Mapped Files ? 但我不太确定我需要如何以这种方式处理它。 或者我遗漏了一些其他的东西,因为使用BinaryWriter和CryptoStream编写“Wittendata的泛化”看起来效果不错。

所以在收到回复后,我重新检查了所有代码,尤其是与ICryptoTransform相关的代码。ICryptoTransform绝对不是问题,这两种方法完全相同。

private void test(string filename, int someint, int chunks, string outputfilename, ICryptoTransform crypt)
    {
        using (FileStream fs = new FileStream(filename, FileMode.Open, FileAccess.Read))
        {
            using (BinaryReader br = new BinaryReader(fs, Encoding.ASCII))
            {
                //reading some not encrypted data
                int h1 = br.ReadInt32();
                int h2 = br.ReadInt32();
                int h3 = br.ReadInt32();
                using (CryptoStream cs = new CryptoStream(fs, crypt, CryptoStreamMode.Read))
                {
                    //reading some encrypted data
                    byte[] somedata = new byte[someint];
                    cs.Read(somedata, 0, someint);
                    //writing the rest of the data to file
                    using (FileStream fsOut = new FileStream(outputfilename, FileMode.Create))
                    {
                        byte[] chunk = new byte[chunks];
                        int bytesRead = 0;
                        while ((bytesRead = cs.Read(chunk, 0, chunks)) > 0)
                        {
                            fsOut.Write(chunk, 0, bytesRead);
                        }
                    }
                }
            }
        }
    }

但不幸的是,这并没有解决这个问题,一些数据和写入文件的数据都与原始数据不一样。

更新#2:

所以这是一个愚蠢的问题——我创造了 CreateEncryptor() 而不是 CreateDecryptor()