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(PHP ActiveX) JWE using PBES2 Key WrappingDemonstrates how to create and decrypt a JWE that using PBES2 key wrapping. This example demonstrates PBES2 with HMAC SHA-256 and A128KW wrapping. It is also possible to do the following by simply changing the "alg" parameter:
Note: This example requires Chilkat v9.5.0.66 or greater.
<?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. $plaintext = 'Live long and prosper.'; // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Jwe') $jwe = new COM("Chilkat.Jwe"); // First build the JWE Protected Header.. // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.JsonObject') $jweProtHdr = new COM("Chilkat.JsonObject"); $jweProtHdr->AppendString('alg','PBES2-HS256+A128KW'); $jweProtHdr->AppendString('enc','A128GCM'); // PBES2 requires two additional parameters: // 1) A random salt parameter ("p2s") containing 8 or more bytes in base64url format. // 2) An iteration count parameter ("p2c"). A minimum count of 1000 is recommended. // The iteration count is intended to make the PBES2 computation more expensive (time consuming) // to prevent brute-force attacks. // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Prng') $prng = new COM("Chilkat.Prng"); $jweProtHdr->AppendString('p2s',$prng->genRandom(16,'base64url')); $jweProtHdr->AppendString('p2c','1000'); print 'JWE Protected Header: ' . $jweProtHdr->emit() . "\n"; print '--' . "\n"; // Don't forget to actually provide the protected header to the JWE object: $jwe->SetProtectedHeader($jweProtHdr); // Set the PBES2 password $recipientIndex = 0; $jwe->SetPassword($recipientIndex,'top secret'); // Encrypt and return the JWE: $strJwe = $jwe->encrypt($plaintext,'utf-8'); if ($jwe->LastMethodSuccess != 1) { print $jwe->LastErrorText . "\n"; exit; } // Show the JWE we just created: print $strJwe . "\n"; // Decrypt the JWE. // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Jwe') $jwe2 = new COM("Chilkat.Jwe"); $success = $jwe2->LoadJwe($strJwe); if ($success != 1) { print $jwe2->LastErrorText . "\n"; exit; } // Set the PBES2 password $jwe2->SetPassword($recipientIndex,'top secret'); // Decrypt. $originalPlaintext = $jwe2->decrypt(0,'utf-8'); if ($jwe2->LastMethodSuccess != 1) { print $jwe2->LastErrorText . "\n"; exit; } print 'original text: ' . "\n"; print $originalPlaintext . "\n"; // Sample output: // JWE Protected Header: {"alg":"PBES2-HS256+A128KW","enc":"A128GCM","p2s":"z39rTEfRy1T1Yn_D1mZRlg","p2c":"1000"} // -- // eyJhbGciOiJQQkVTMi1IUzI1NitBMTI4S1ciLCJlbmMiOiJBMTI4R0NNIiwicDJzIjoiejM5clRFZlJ5MVQxWW5fRDFtWlJsZyIsInAyYyI6IjEwMDAifQ.koYt6PrFmYwcwdcT7ZcvXHA1d-Xez5h4.luGlbvEnZp-7IsBOj42Yhw.YMTcfLf8Qe4zazozGV2OAu3cUdQ8Kg.rWub47ESWkc6IqZJTvSTmg // original text: // Live long and prosper. ?> |
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