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(PHP Extension) JWE with Binary DataDemonstrates how to create a JWE that contains a binary payload (such as a JPG image). Note: This example requires Chilkat v9.5.0.66 or greater.
<?php // The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number. // For example, if using Chilkat v9.5.0.48, then include as shown here: include("chilkat_9_5_0.php"); // This requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // Note: This example requires Chilkat v9.5.0.66 or greater. // Load a JPG file that will be the JWE payload. $jpgBytes = new CkBinData(); $success = $jpgBytes->LoadFile('qa_data/jpg/starfish.jpg'); // Make sure your app checks the success/failure of the call to LoadFile.. print 'Original JPG size = ' . $jpgBytes->get_NumBytes() . "\n"; $jwe = new CkJwe(); $jweProtHdr = new CkJsonObject(); $jweProtHdr->AppendString('alg','A128KW'); $jweProtHdr->AppendString('enc','A128CBC-HS256'); $jwe->SetProtectedHeader($jweProtHdr); $aesWrappingKey = 'GawgguFyGrWKav7AX4VKUg'; $jwe->SetWrappingKey(0,$aesWrappingKey,'base64url'); // Encrypt and return the JWE in sbJwe: $sbJwe = new CkStringBuilder(); $success = $jwe->EncryptBd($jpgBytes,$sbJwe); if ($success != true) { print $jwe->lastErrorText() . "\n"; exit; } // Show the JWE: print $sbJwe->getAsString() . "\n"; print 'size of JWE: ' . $sbJwe->get_Length() . "\n"; // --------------------------------------------------------- // Decrypt to get the original JPG file.. $jwe2 = new CkJwe(); $success = $jwe2->LoadJweSb($sbJwe); if ($success != true) { print $jwe2->lastErrorText() . "\n"; exit; } // Set the AES wrap key. $jwe2->SetWrappingKey(0,$aesWrappingKey,'base64url'); // Decrypt. $jpgOriginal = new CkBinData(); $success = $jwe2->DecryptBd(0,$jpgOriginal); if ($success != true) { print $jwe2->lastErrorText() . "\n"; exit; } print 'Decrypted JPG size = ' . $jpgOriginal->get_NumBytes() . "\n"; // Save the decrypted JPG to a file. $success = $jpgOriginal->WriteFile('qa_output/jwe_decrypted_starfish.jpg'); print 'success = ' . $success . "\n"; // The output of this program, when tested, was: // Original JPG size = 6229 // eyJhbGciOiJBMTI4S1ciLCJlbmMiOiJBMTI4Q0JDLUhTMjU2In0.9YFz_wteV ... 7Et3hKhpxnKEXw // size of JWE: 8473 // Decrypted JPG size = 6229 // success = True ?> |
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