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(Swift) Streaming Compression --> Streaming EncryptionDemonstrate how to feed a compression stream into an encryption stream. This example does the following: Data File --> Compress --> Encrypt --> Application Reads
func chilkatTest() { // This requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. var success: Bool // Initialize the compression object. let compress = CkoCompression() compress.Algorithm = "deflate" // Initialize the encryption object. let crypt = CkoCrypt2() crypt.CryptAlgorithm = "chacha20" crypt.KeyLength = 256 crypt.EncodingMode = "hex" var ivHex: String? = "000000000000000000000002" crypt.SetEncodedIV(ivHex, encoding: "hex") crypt.InitialCount = 42 var keyHex: String? = "1c9240a5eb55d38af333888604f6b5f0473917c1402b80099dca5cbc207075c0" crypt.SetEncodedKey(keyHex, encoding: "hex") // Setup the streams. // streamC is for compression let streamC = CkoStream() // streamE is for encryption let streamE = CkoStream() // 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.. var taskC: CkoTask? = compress.CompressStreamAsync(streamC) var taskE: CkoTask? = crypt.EncryptStreamAsync(streamE) success = taskC!.Run() success = taskE!.Run() // Read the compressed and encrypted bytes. let outData = CkoBinData() 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) || (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 } taskE = nil taskC = nil // 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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