(PowerShell) 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 Assemblies

Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll"

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

$rest = New-Object Chilkat.Rest

$bTls = $true
$port = 443
$bAutoReconnect = $true
$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 -ne $true) {
    $($rest.LastErrorText)
    exit
}

# Read the response header.
$responseStatusCode = $rest.ReadResponseHeader()
if ($responseStatusCode -lt 0) {
    $($rest.LastErrorText)
    exit
}

$("Response status code = " + $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 -ne 200) {
    $errResponse = $rest.ReadRespBodyString()
    if ($rest.LastMethodSuccess -ne $true) {
        $($rest.LastErrorText)
    }
    else {
        $($errResponse)
    }

    exit
}

# 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..
$crypt = New-Object 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")

$receiveStream = New-Object Chilkat.Stream
# The decryptStream's source will be the receiveStream.
$decryptStream = New-Object 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.
$decryptStreamTask = $crypt.DecryptStreamAsync($decryptStream)
$success = $decryptStreamTask.Run()

$success = $rest.ReadRespBodyStream($receiveStream,$true)
if ($success -ne $true) {
    $($rest.LastErrorText)
    exit
}

$("Successfully received the .zip file.")