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(Chilkat2-Python) Stream a file to compression to encryption to an output file.Runs a chain of streams to read a source file, compress, encrypt, and write an output file.
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) # The sink for the encryptor is the output file. streamE.SinkFile = "qa_output/compressed_encrypted.dat" # 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() # Let the streams run until finished. # 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) # check for success.. if (taskE.TaskSuccess != True): print("async encryption failed:") print(taskE.ResultErrorText) success = False # check for success.. if (taskC.TaskSuccess != True): print("async compression failed:") print(taskC.ResultErrorText) success = False # Load the file that was produced and decrypt/decompress to verify. binData = chilkat2.BinData() success = binData.LoadFile("qa_output/compressed_encrypted.dat") success = crypt.DecryptBd(binData) success = compress.DecompressBd(binData) # binData should contain the original data.. success = binData.WriteFile("qa_output/original_hamlet.xml") print("Finished.") |
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