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(PHP Extension) Create a JWS Using ECDSA P-521 SHA-512Creates and verifies a JSON Web Signature (JWS) that uses ECDSA P-521 SHA-512 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. // Use the following ECC key loaded from JWK format. $sbJwk = new CkStringBuilder(); $sbJwk->Append('{\'kty\':\'EC\','); $sbJwk->Append('\'crv\':\'P-521\','); $sbJwk->Append('\'x\':\'AekpBQ8ST8a8VcfVOTNl353vSrDCLLJXmPk06wTjxrrjcBpXp5EOnYG_NjFZ6OvLFV1jSfS9tsz4qUxcWceqwQGk\','); $sbJwk->Append('\'y\':\'ADSmRA43Z1DSNx_RvcLI87cdL07l6jQyyBXMoxVg_l2Th-x3S1WDhjDly79ajL4Kkd0AZMaZmh9ubmf63e3kyMj2\','); $sbJwk->Append('\'d\':\'AY5pb7A0UFiB3RELSD64fTLOSV_jazdF7fLYyuTw8lOfRhWg6Y6rUrPAxerEzgdRhajnu0ferB0d53vM9mE15j2C\''); $sbJwk->Append('}'); $eccKey = new CkPrivateKey(); // Note: This example loads the ECDSA key from JWK format. Any format can be loaded // into the private key object. (See the online reference documentation..) $success = $eccKey->LoadJwk($sbJwk->getAsString()); if ($success != true) { print $eccKey->lastErrorText() . "\n"; exit; } // Create the JWS Protected Header $jwsProtHdr = new CkJsonObject(); $jwsProtHdr->AppendString('alg','ES512'); $jws = new CkJws(); // Set the protected header: $signatureIndex = 0; $jws->SetProtectedHeader($signatureIndex,$jwsProtHdr); // Set the ECC key: $jws->SetPrivateKey($signatureIndex,$eccKey); // Set the payload. $bIncludeBom = false; $payloadStr = 'In our village, folks say God crumbles up the old moon into stars.'; $jws->SetPayload($payloadStr,'utf-8',$bIncludeBom); // Create the JWS // By default, the compact serialization is used. $jwsCompact = $jws->createJws(); if ($jws->get_LastMethodSuccess() != true) { print $jws->lastErrorText() . "\n"; exit; } print 'JWS: ' . $jwsCompact . "\n"; // Note: ECC signatures use random values, so the output will be different each time a signature is produced. // sample output: // JWS: eyJhbGciOiJFUzUxMiJ9.SW4gb3VyIHZpbGxhZ2UsIGZvbGtzIHNheSBHb2QgY3J1bWJsZXMgdXAgdGhlIG9sZCBtb29uIGludG8gc3RhcnMu.AFOnOtZ8UTp-ed1PfLfXxwGU7zT_jnmGGxew-d1CP6SfKa5RUhav5mF4szhSof22JaoQ742VIa0eZ0s1rhBnj8y6APr6g6vKzIpYZlJsnjzjUwAjDQOLmcsjxrrRfATh-NEv7G0Z9FrjdJasS44tCG2EnG6aT2TW-sPG0dy5o9jUWCzi // Now load the JWS, validate, and recover the original text. $jws2 = new CkJws(); // Load the JWS. $success = $jws2->LoadJws($jwsCompact); // eccPubKey is a CkPublicKey $eccPubKey = $eccKey->GetPublicKey(); // Set the ECC public key used for validation. $signatureIndex = 0; $jws2->SetPublicKey($signatureIndex,$eccPubKey); // Validate the 1st (and only) signature at index 0.. $v = $jws2->Validate($signatureIndex); if ($v < 0) { // Perhaps Chilkat was not unlocked or the trial expired.. print 'Method call failed for some other reason.' . "\n"; print $jws2->lastErrorText() . "\n"; exit; } if ($v == 0) { print 'Invalid signature. The ECC key was incorrect, the JWS was invalid, or both.' . "\n"; exit; } // If we get here, the signature was validated.. print 'Signature validated.' . "\n"; // Recover the original content: print $jws2->getPayload('utf-8') . "\n"; // Examine the protected header: // joseHeader is a CkJsonObject $joseHeader = $jws2->GetProtectedHeader($signatureIndex); if ($jws2->get_LastMethodSuccess() != true) { print 'No protected header found at the given index.' . "\n"; exit; } $joseHeader->put_EmitCompact(false); print 'Protected (JOSE) header:' . "\n"; print $joseHeader->emit() . "\n"; // Output: // Signature validated. // In our village, folks say God crumbles up the old moon into stars. // Protected (JOSE) header: // { // "alg": "ES512" // } ?> |
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