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(Unicode C++) 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
#include <CkCompressionW.h> #include <CkCrypt2W.h> #include <CkStreamW.h> #include <CkTaskW.h> #include <CkBinDataW.h> void ChilkatSample(void) { // This requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. bool success; // Initialize the compression object. CkCompressionW compress; compress.put_Algorithm(L"deflate"); // Initialize the encryption object. CkCrypt2W crypt; crypt.put_CryptAlgorithm(L"chacha20"); crypt.put_KeyLength(256); crypt.put_EncodingMode(L"hex"); const wchar_t *ivHex = L"000000000000000000000002"; crypt.SetEncodedIV(ivHex,L"hex"); crypt.put_InitialCount(42); const wchar_t *keyHex = L"1c9240a5eb55d38af333888604f6b5f0473917c1402b80099dca5cbc207075c0"; crypt.SetEncodedKey(keyHex,L"hex"); // Setup the streams. // streamC is for compression CkStreamW streamC; // streamE is for encryption CkStreamW streamE; // The source for the compressor is a file. streamC.put_SourceFile(L"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.. CkTaskW *taskC = compress.CompressStreamAsync(streamC); CkTaskW *taskE = crypt.EncryptStreamAsync(streamE); success = taskC->Run(); success = taskE->Run(); // Read the compressed and encrypted bytes. CkBinDataW outData; 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) || (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) { wprintf(L"async encryption failed:\n"); wprintf(L"%s\n",taskE->resultErrorText()); success = false; } // Double-check for success.. if (taskC->get_TaskSuccess() != true) { wprintf(L"async compression failed:\n"); wprintf(L"%s\n",taskC->resultErrorText()); success = false; } delete taskE; delete taskC; // Save the compressed/encrypted data to a file. outData.WriteFile(L"qa_output/compressedEncrypted.dat"); wprintf(L"The async compress/encrypt was successful.\n"); // 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(L"qa_output/original_hamlet.xml"); } |
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