无法解析压缩、加密、解密、解压流实现

Question

我一直在与链式 using 语句作斗争，无法解决一长串实施问题中的最新问题。我需要压缩、加密并将生成的 IV 附加到所选文件。这一切似乎都正常工作，但我无法解除这个过程。在查看了几篇类似的堆栈帖子和文章后，我仍然无法让它工作，现在正在寻求更直接的帮助。

最近抛出的错误是 System.IO.InvalidDataException: 'Found invalid data while decoding.' 似乎解密流没有按预期运行，这使解压流变得异常。

byte[] key;
byte[] salt;
const int keySize = 256;
const int blockSize = keySize;
byte[] iv = new byte[blockSize / 8];//size to bits
RijndaelManaged rjndl;
RNGCryptoServiceProvider cRng;

void InitializeCryptor() {
    //Temporarily define the salt & key
    salt = Encoding.UTF8.GetBytes("SaltShouldBeAtLeast8Bytes");
    key = new Rfc2898DeriveBytes("MyL0ngPa$$phra$e", salt, 4).GetBytes(keySize / 8);

    //Initialize the crypto RNG generator
    cRng = new RNGCryptoServiceProvider();

    // Create instance of Rijndael (AES) for symetric encryption of the data.
    rjndl = new RijndaelManaged();
    rjndl.KeySize = keySize;
    rjndl.BlockSize = blockSize;
    rjndl.Mode = CipherMode.CBC;
}

void CompressAndEncryptFile(string relativeFilePath, string fileName) {
    //Create a unique IV each time
    cRng.GetBytes(iv);

    //Create encryptor
    rjndl.Key = key;
    rjndl.IV = iv;
    ICryptoTransform encryptor = rjndl.CreateEncryptor(rjndl.Key, rjndl.IV);

    //Create file specific output sub-directory
    Directory.CreateDirectory(Path.Combine(outputPath, relativeFilePath));

    //Read and compress file into memory stream
    using (FileStream readStream = File.OpenRead(Path.Combine(initialpath, relativeFilePath, fileName)))
            using (FileStream writeStream = new FileStream(Path.Combine(outputPath, relativeFilePath, fileName + ".dat"), FileMode.Create))
    using (CryptoStream encryptStream = new CryptoStream(writeStream, encryptor, CryptoStreamMode.Write))
    using (DeflateStream compStream = new DeflateStream(encryptStream, CompressionLevel.Optimal)) {
        //Write the following to the FileStream for the encrypted file:
        // - length of the IV
        // - the IV
        byte[] ivSize = BitConverter.GetBytes(rjndl.IV.Length);
        writeStream.Write(ivSize, 0, 4);
        writeStream.Write(rjndl.IV, 0, rjndl.BlockSize / 8);

        readStream.CopyTo(compStream);
    }
}

void DecryptAndDecompressFile(string relativeFilePath) {
    string outputPath = Path.Combine(initialpath, "Unpack");
    Directory.CreateDirectory(outputPath);

    using (FileStream readStream = new FileStream(Path.Combine(initialpath, manifestData.version, relativeFilePath + ".dat"), FileMode.Open)) {
        byte[] tmpLength = new byte[4];

        //Read length of IV
        readStream.Seek(0, SeekOrigin.Begin);
        readStream.Read(tmpLength, 0, 3);

        int ivLength = BitConverter.ToInt32(tmpLength, 0);

        byte[] readIv = new byte[ivLength];

        //Read IV
        readStream.Seek(4, SeekOrigin.Begin);
        readStream.Read(readIv, 0, ivLength);
        rjndl.IV = readIv;

        //Start at beginning of encrypted data
        readStream.Seek(4 + ivLength, SeekOrigin.Begin);

        //Create decryptor
        ICryptoTransform decryptor = rjndl.CreateEncryptor(key, readIv);
        using (CryptoStream decryptStream = new CryptoStream(readStream, decryptor, CryptoStreamMode.Read))
        using (DeflateStream decompStream = new DeflateStream(decryptStream, CompressionMode.Decompress))
        using (FileStream writeStream = new FileStream(Path.Combine(outputPath, relativeFilePath), FileMode.Create)) {
            decompStream.CopyTo(writeStream);
        }
    }
}

对于那些喜欢指出其他类似的堆栈问题并在不提供支持的情况下投票给 close/duplicate 的人，以下是我首先完成的主题和帖子，但均未成功。 https://docs.microsoft.com/en-us/dotnet/standard/security/walkthrough-creating-a-cryptographic-application https://docs.microsoft.com/en-us/dotnet/api/system.security.cryptography.rijndaelmanaged?redirectedfrom=MSDN&view=netcore-3.1 Chained GZipStream/DeflateStream and CryptoStream (AES) breaks when reading DeflateStream / GZipStream to CryptoStream and vice versa https://docs.microsoft.com/en-us/dotnet/api/system.io.compression.gzipstream?redirectedfrom=MSDN&view=netcore-3.1#code-snippet-2 Compression/Decompression string with C#

Answer 1

经过大约 2 天的调查，我找到了我的错误。

我在解密部分调用 rjndl.CreateEncryptor 而不是 rjndl.CreateDecryptor...（请告诉我这种类型的 $#!t 也发生在其他人身上）

一旦我完成测试，我将更新我的问题代码，作为将来通过 google 登陆这里的任何人的一个很好的例子。

无法解析压缩、加密、解密、解压流实现

Unable to resolve compression, encryption, decryption, decompression stream implementation

c#

stream

deflatestream

cryptostream