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(PHP ActiveX) 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
<?php // This requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // Initialize the compression object. $compress = new COM("Chilkat_9_5_0.Compression"); $compress->Algorithm = 'deflate'; // Initialize the encryption object. $crypt = new COM("Chilkat_9_5_0.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 = new COM("Chilkat_9_5_0.Stream"); // streamE is for encryption $streamE = new COM("Chilkat_9_5_0.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 Chilkat_9_5_0.Task $taskC = $compress->CompressStreamAsync($streamC); // taskE is a Chilkat_9_5_0.Task $taskE = $crypt->EncryptStreamAsync($streamE); $success = $taskC->Run(); $success = $taskE->Run(); // Read the compressed and encrypted bytes. $outData = new COM("Chilkat_9_5_0.BinData"); while (($streamE->EndOfStream != 1)) { if ($streamE->DataAvailable == 1) { $success = $streamE->ReadBd($outData); } } // Let's make sure the background task finished. // It should already be the case that the task is finished. while ((($taskE->Finished != 1) or ($taskC->Finished != 1))) { $taskE->SleepMs(20); } // Get any remaining data that needs to be flushed. if ($streamE->DataAvailable == 1) { $success = $streamE->ReadBd($outData); } // Double-check for success.. if ($taskE->TaskSuccess != 1) { print 'async encryption failed:' . "\n"; print $taskE->ResultErrorText . "\n"; $success = 0; } // Double-check for success.. if ($taskC->TaskSuccess != 1) { print 'async compression failed:' . "\n"; print $taskC->ResultErrorText . "\n"; $success = 0; } // Save the compressed/encrypted data to a file. $outData->WriteFile('qa_output/compressedEncrypted.dat'); print '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('qa_output/original_hamlet.xml'); ?> |
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