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(PHP Extension) JWE with DEFLATE CompressionDemonstrates how to DEFLATE ("zip") compress the JWE payload prior to encryption. 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. // Create some plaintext to be encrypted. // This example will demonstrate with and without DEFLATE (zip) compression. $sbPlainText = new CkStringBuilder(); $bCrLf = true; $line = 'Live long and prosper.'; $sbPlainText->AppendLine($line,$bCrLf); $sbPlainText->AppendLine($line,$bCrLf); $sbPlainText->AppendLine($line,$bCrLf); $sbPlainText->AppendLine($line,$bCrLf); // The text to be encrypted: print $sbPlainText->getAsString() . "\n"; $jwe = new CkJwe(); // Build the JWE Protected Header: {"alg":"A128KW","enc":"A128CBC-HS256","zip":"DEF"} // The "zip":"DEF" parameter indicates that the plaintext payload should // be compressed prior to encryption. $jweProtHdr = new CkJsonObject(); $jweProtHdr->AppendString('alg','A128KW'); $jweProtHdr->AppendString('enc','A128CBC-HS256'); $jweProtHdr->AppendString('zip','DEF'); $jwe->SetProtectedHeader($jweProtHdr); // Set the AES key wrap key: $aesWrappingKey = 'GawgguFyGrWKav7AX4VKUg'; $jwe->SetWrappingKey(0,$aesWrappingKey,'base64url'); // Encrypt and return the JWE in sbJweCompressed: $sbJweCompressed = new CkStringBuilder(); $success = $jwe->EncryptSb($sbPlainText,'utf-8',$sbJweCompressed); if ($success != true) { print $jwe->lastErrorText() . "\n"; exit; } // Show the compressed JWE: print $sbJweCompressed->getAsString() . "\n"; print 'size of compressed JWE: ' . $sbJweCompressed->get_Length() . "\n"; // Now create a JWE without compression. $jweProtHdr->Delete('zip'); // Make sure to update the shared protected header: $jwe->SetProtectedHeader($jweProtHdr); $sbJweUncompressed = new CkStringBuilder(); $success = $jwe->EncryptSb($sbPlainText,'utf-8',$sbJweUncompressed); if ($success != true) { print $jwe->lastErrorText() . "\n"; exit; } // Show the uncompressed JWE: print $sbJweUncompressed->getAsString() . "\n"; print 'size of uncompressed JWE: ' . $sbJweUncompressed->get_Length() . "\n"; // Decrypting is the same whether compression is used or not. // The "zip" header in the JWE indicates that the payload should be // automatically decompressed (inflated) after decrypting. $jwe2 = new CkJwe(); $success = $jwe2->LoadJweSb($sbJweCompressed); if ($success != true) { print $jwe2->lastErrorText() . "\n"; exit; } // Set the AES wrap key. $jwe2->SetWrappingKey(0,$aesWrappingKey,'base64url'); // Decrypt (also automatically decompresses). $sbOriginalText = new CkStringBuilder(); $success = $jwe2->DecryptSb(0,'utf-8',$sbOriginalText); if ($success != true) { print $jwe2->lastErrorText() . "\n"; exit; } print 'original text from compressed JWE: ' . "\n"; print $sbOriginalText->getAsString() . "\n"; // ----------------------------------------------------------- // Do the same with the uncompressed JWE $success = $jwe2->LoadJweSb($sbJweUncompressed); if ($success != true) { print $jwe2->lastErrorText() . "\n"; exit; } // Set the AES wrap key. $jwe2->SetWrappingKey(0,$aesWrappingKey,'base64url'); // Decrypt. $sbOriginalText->Clear(); $success = $jwe2->DecryptSb(0,'utf-8',$sbOriginalText); if ($success != true) { print $jwe2->lastErrorText() . "\n"; exit; } print 'original text from uncompressed JWE: ' . "\n"; print $sbOriginalText->getAsString() . "\n"; // ------------------------------------------------ // The output of this example is: // (Note: Your output data will be different because the content encryption key is randomly generated.) // eyJhbGciOiJBMTI4S1ciLCJlbmMiOiJBMTI4Q0JDLUhTMjU2IiwiemlwIjoiREVGIn0.xuW-pEAIdEUFnk10m8ocursvktO8Of9ByCCAt6LgKkkOtCWCUn1kQw.zpGj-9WVni3cQxyOuZbcGA.0hzP1myua3oYpUHwCIY_3edBUREbUpLaX6wYuJduOdI.Ppc6aEO3y3B8BJ1FKMPjlA // size of compressed JWE: 212 // eyJhbGciOiJBMTI4S1ciLCJlbmMiOiJBMTI4Q0JDLUhTMjU2In0.N4KeyC7nnSFkieJOyE24_zKeuV_m7v5UKoJb1TgV4Yc_r2RzUPNvyA.6AEdyXSCKx-iMmUJyypSLg.QpixfyrwhGpmwUDp623viik4smPav7vwPLiC2r-V-jwnSfEH3mxWu6DbrIz3mixaqATwynmEBzVPxvS9jTXpSAGCnniib4_0WoPl3r_wF5tlsKOEe--jpNso-DKd1Tp8jJxj3JkFWt3IRnUUKGj17g.sBfDwFc5fzpaI-UW8-SW4g // size of uncompressed JWE: 303 // original text from compressed JWE: // Live long and prosper. // Live long and prosper. // Live long and prosper. // Live long and prosper. // // original text from uncompressed JWE: // Live long and prosper. // Live long and prosper. // Live long and prosper. // Live long and prosper. // ?> |
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