(C#) Streaming Decrypt HTTP Response

If the an encrypted file was previously uploaded, this example demonstrates how to download and decrypt in a streaming way.

Chilkat .NET Downloads Chilkat .NET Framework Chilkat for .NET Core

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

Chilkat.Rest rest = new Chilkat.Rest();

bool bTls = true;
int port = 443;
bool bAutoReconnect = true;
bool success = rest.Connect("chilkatdownload.com",port,bTls,bAutoReconnect);

// Send the request to download a file.
success = rest.SendReqNoBody("GET","/9.5.0.83/chilkat-9.5.0-python-3.8-x64.zip");
if (success != true) {
    Debug.WriteLine(rest.LastErrorText);
    return;
}

// Read the response header.
int responseStatusCode = rest.ReadResponseHeader();
if (responseStatusCode < 0) {
    Debug.WriteLine(rest.LastErrorText);
    return;
}

Debug.WriteLine("Response status code = " + Convert.ToString(responseStatusCode));

// We expect a 200 response status if the JPG data is coming.
// Otherwise, we'll get a string response body with an error message(or no response body).
if (responseStatusCode != 200) {
    string errResponse = rest.ReadRespBodyString();
    if (rest.LastMethodSuccess != true) {
        Debug.WriteLine(rest.LastErrorText);
    }
    else {
        Debug.WriteLine(errResponse);
    }

    return;
}

// Create an object for decrypting.
// This example will use "none" for the encryption algorithm, which means it's just a pass-through.
// Typically you would set the decrypt properties, such as secret key, IV, key length, padding scheme, cipher mode..
Chilkat.Crypt2 crypt = new Chilkat.Crypt2();
crypt.CryptAlgorithm = "none";

// The following settings are ignored in this test because our CryptAlgorithm is "none".
// However, if you were truly decrypting, you might set CryptAlgorithm = "aes".
crypt.CipherMode = "cbc";
crypt.KeyLength = 128;
crypt.SetEncodedKey("000102030405060708090A0B0C0D0E0F","hex");
crypt.SetEncodedIV("000102030405060708090A0B0C0D0E0F","hex");

Chilkat.Stream receiveStream = new Chilkat.Stream();
// The decryptStream's source will be the receiveStream.
Chilkat.Stream decryptStream = new Chilkat.Stream();

// The decrypt stream's sink will be a file.
decryptStream.SinkFile = "qa_output/chilkat-9.5.0-python-3.8-x64.zip";
decryptStream.SetSourceStream(receiveStream);

// Create and run a background async task to decrypt incoming data and write to a file.
Chilkat.Task decryptStreamTask = crypt.DecryptStreamAsync(decryptStream);
success = decryptStreamTask.Run();

success = rest.ReadRespBodyStream(receiveStream,true);
if (success != true) {
    Debug.WriteLine(rest.LastErrorText);
    return;
}

Debug.WriteLine("Successfully received the .zip file.");