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(Android™) 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
// Important: Don't forget to include the call to System.loadLibrary // as shown at the bottom of this code sample. package com.test; import android.app.Activity; import com.chilkatsoft.*; import android.widget.TextView; import android.os.Bundle; public class SimpleActivity extends Activity { private static final String TAG = "Chilkat"; // Called when the activity is first created. @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // This requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. boolean success; // Initialize the compression object. CkCompression compress = new CkCompression(); compress.put_Algorithm("deflate"); // Initialize the encryption object. CkCrypt2 crypt = new CkCrypt2(); crypt.put_CryptAlgorithm("chacha20"); crypt.put_KeyLength(256); crypt.put_EncodingMode("hex"); String ivHex = "000000000000000000000002"; crypt.SetEncodedIV(ivHex,"hex"); crypt.put_InitialCount(42); String keyHex = "1c9240a5eb55d38af333888604f6b5f0473917c1402b80099dca5cbc207075c0"; crypt.SetEncodedKey(keyHex,"hex"); // Setup the streams. // streamC is for compression CkStream streamC = new CkStream(); // streamE is for encryption CkStream streamE = new CkStream(); // The source for the compressor is a file. streamC.put_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.. CkTask taskC = compress.CompressStreamAsync(streamC); CkTask taskE = crypt.EncryptStreamAsync(streamE); success = taskC.Run(); success = taskE.Run(); // Read the compressed and encrypted bytes. CkBinData outData = new CkBinData(); while ((streamE.get_EndOfStream() != true)) { if (streamE.get_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.get_Finished() != true) or (taskC.get_Finished() != true))) { taskE.SleepMs(20); } // Get any remaining data that needs to be flushed. if (streamE.get_DataAvailable() == true) { success = streamE.ReadBd(outData); } // Double-check for success.. if (taskE.get_TaskSuccess() != true) { Log.i(TAG, "async encryption failed:"); Log.i(TAG, taskE.resultErrorText()); success = false; } // Double-check for success.. if (taskC.get_TaskSuccess() != true) { Log.i(TAG, "async compression failed:"); Log.i(TAG, taskC.resultErrorText()); success = false; } // Save the compressed/encrypted data to a file. outData.WriteFile("qa_output/compressedEncrypted.dat"); Log.i(TAG, "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"); } static { System.loadLibrary("chilkat"); // Note: If the incorrect library name is passed to System.loadLibrary, // then you will see the following error message at application startup: //"The application <your-application-name> has stopped unexpectedly. Please try again." } } |
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