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(PHP ActiveX) Compress and Encrypt a Large File (Low and Constant Memory Footprint)See more Compression ExamplesDemonstrates how to compress and encrypt a large file such that the memory footprint remains low and constant. Note: This example requires Chilkat v9.5.0.99 or greater.
<?php // This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. $compress = new COM("Chilkat_9_5_0.Compression"); $compress->Algorithm = 'deflate'; // Set encryption params. // The possible values are the same as for the corresponding properties in the Chilkat Crypt2 class/object. // The encoded IV and Key must be specified as hex. $json = new COM("Chilkat_9_5_0.JsonObject"); $json->UpdateString('cryptAlgorithm','aes'); $json->UpdateString('cipherMode','cbc'); $json->UpdateInt('keyLength',128); $json->UpdateInt('paddingScheme',0); $json->UpdateString('encodedIV','000102030405060708090A0B0C0D0E0F'); $json->UpdateString('encodedKey','000102030405060708090A0B0C0D0E0F'); // Do file-to-file compression+encryption in a single call. $inPath = 'qa_data/largeFile.dat'; $outPath = 'c:/temp/qa_output/compressed_encrypted.dat'; $success = $compress->CompressEncryptFile($json,$inPath,$outPath); if ($success == 0) { print $compress->LastErrorText . "\n"; exit; } // We can do file-to-file decrypt/decompress like this: $inPath2 = $outPath; $outPath2 = 'c:/temp/qa_output/restored.dat'; $success = $compress->DecryptDecompressFile($json,$inPath2,$outPath2); if ($success == 0) { print $compress->LastErrorText . "\n"; exit; } // Note: The above decrypt + decompress is the equivalent of doing the same in these two steps: $crypt = new COM("Chilkat_9_5_0.Crypt2"); $crypt->CryptAlgorithm = 'aes'; $crypt->CipherMode = 'cbc'; $crypt->KeyLength = 128; $crypt->PaddingScheme = 0; $crypt->SetEncodedIV('000102030405060708090A0B0C0D0E0F','hex'); $crypt->SetEncodedKey('000102030405060708090A0B0C0D0E0F','hex'); $decryptedPath = 'c:/temp/qa_output/decrypted.dat'; $success = $crypt->CkDecryptFile($inPath2,$decryptedPath); if ($success == 0) { print $crypt->LastErrorText . "\n"; exit; } $outPath3 = 'c:/temp/qa_output/restored_in_two_steps.dat'; $success = $compress->DecompressFile($decryptedPath,$outPath3); if ($success == 0) { print $compress->LastErrorText . "\n"; exit; } print 'Success.' . "\n"; ?> |
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