(Ruby) 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 Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

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

rest = Chilkat::CkRest.new()

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 != true)
    print rest.lastErrorText() + "\n";
    exit
end

# Read the response header.
responseStatusCode = rest.ReadResponseHeader()
if (responseStatusCode < 0)
    print rest.lastErrorText() + "\n";
    exit
end

print "Response status code = " + responseStatusCode.to_s() + "\n";

# 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)
    errResponse = rest.readRespBodyString()
    if (rest.get_LastMethodSuccess() != true)
        print rest.lastErrorText() + "\n";
    else
        print errResponse + "\n";
    end

    exit
end

# 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 = Chilkat::CkCrypt2.new()
crypt.put_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.put_CipherMode("cbc")
crypt.put_KeyLength(128)
crypt.SetEncodedKey("000102030405060708090A0B0C0D0E0F","hex")
crypt.SetEncodedIV("000102030405060708090A0B0C0D0E0F","hex")

receiveStream = Chilkat::CkStream.new()
# The decryptStream's source will be the receiveStream.
decryptStream = Chilkat::CkStream.new()

# The decrypt stream's sink will be a file.
decryptStream.put_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 is a CkTask
decryptStreamTask = crypt.DecryptStreamAsync(decryptStream)
success = decryptStreamTask.Run()

success = rest.ReadRespBodyStream(receiveStream,true)
if (success != true)
    print rest.lastErrorText() + "\n";
    exit
end

print "Successfully received the .zip file." + "\n";