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(Chilkat2-Python) Streaming Compression --> Streaming Encryption
Demonstrate how to feed a compression stream into an encryption stream. This example does the following:
Data File --> Compress --> Encrypt --> Application Reads
import chilkat2 # This requires the Chilkat API to have been previously unlocked. # See Global Unlock Sample for sample code. # Initialize the compression object. compress = chilkat2.Compression() compress.Algorithm = "deflate" # Initialize the encryption object. crypt = chilkat2.Crypt2() crypt.CryptAlgorithm = "chacha20" crypt.KeyLength = 256 crypt.EncodingMode = "hex" ivHex = "000000000000000000000002" crypt.SetEncodedIV(ivHex,"hex") crypt.InitialCount = 42 keyHex = "1c9240a5eb55d38af333888604f6b5f0473917c1402b80099dca5cbc207075c0" crypt.SetEncodedKey(keyHex,"hex") # Setup the streams. # streamC is for compression streamC = chilkat2.Stream() # streamE is for encryption streamE = chilkat2.Stream() # The source for the compressor is a file. streamC.SourceFile = "qa_data/hamlet.xml" # The source for the encryptor is the output of the compressor stream. success = streamE.SetSourceStream(streamC) # Our application will be reading the output of streamE. # Start the compression and encryption streams in background threads.. # taskC is a CkTask taskC = compress.CompressStreamAsync(streamC) # taskE is a CkTask taskE = crypt.EncryptStreamAsync(streamE) success = taskC.Run() success = taskE.Run() # Read the compressed and encrypted bytes. outData = chilkat2.BinData() while (streamE.EndOfStream != True) : if (streamE.DataAvailable == True): success = streamE.ReadBd(outData) # Let's make sure the background task finished. # It should already be the case that the task is finished. while ((taskE.Finished != True) or (taskC.Finished != True)) : taskE.SleepMs(20) # Get any remaining data that needs to be flushed. if (streamE.DataAvailable == True): success = streamE.ReadBd(outData) # Double-check for success.. if (taskE.TaskSuccess != True): print("async encryption failed:") print(taskE.ResultErrorText) success = False # Double-check for success.. if (taskC.TaskSuccess != True): print("async compression failed:") print(taskC.ResultErrorText) success = False # Save the compressed/encrypted data to a file. outData.WriteFile("qa_output/compressedEncrypted.dat") print("The async compress/encrypt was successful.") # Let's decrypt and decompress to further verify... success = crypt.DecryptBd(outData) success = compress.DecompressBd(outData) # outData should contain the original data.. success = outData.WriteFile("qa_output/original_hamlet.xml")
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