(PHP Extension) Compute JWK Thumbprint for RSA and EC Private Keys

Demonstrates how to compute a JSON Web Key thumbprint for a private key (RSA or ECC).

Note: This example requires Chilkat v9.5.0.66 or greater.

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<?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");

$privKey = new CkPrivateKey();

// A private key can be loaded from any format (binary DER, PEM, etc.)
// This example will load the private keys from PEM format, 
// and will then compute the JWK thumbprint.

// First do it for this RSA private key...

$sbPem = new CkStringBuilder();
$bCrlf = true;
$sbPem->AppendLine('-----BEGIN RSA PRIVATE KEY-----',$bCrlf);
$sbPem->AppendLine('Proc-Type: 4,ENCRYPTED',$bCrlf);
$sbPem->AppendLine('DEK-Info: DES-EDE3-CBC,2E65118E6C7B5207',$bCrlf);
$sbPem->AppendLine('',$bCrlf);
$sbPem->AppendLine('7cYUTW4ZBdmVZ4ILB08hcTdm5ib0E0zcy+I7pHpNQfJHtI7BJ4omys5S19ufJPBJ',$bCrlf);
$sbPem->AppendLine('IzYjeO7oTVqI37F6EUmjZqG4WVE2UQbQDkosZbZN82O4Ipu1lFAPEbwjqePMKufz',$bCrlf);
$sbPem->AppendLine('snSQHKfnbyyDPEVNlJbs19NXC8v6g+pQay5rH/I6N2iBxgsTmuemZ54EhNQMZyEN',$bCrlf);
$sbPem->AppendLine('R/CiheArWEH9H8/4hd2gc9Tb2s0MwGHILL4kbbNm5tp3xw4ik7OYWNrj3m+nG6Xb',$bCrlf);
$sbPem->AppendLine('vKXh2xEanAZAyMXTqDJTHdn7/CEqusQPJjZGV+Mf1kjKu7p4qcXFnIXP5ILnTW7b',$bCrlf);
$sbPem->AppendLine('lHoWC4eweDzKOMRzXmbABEVSUvx2SmPl4TcoC5L1SCAHEmZaKbaY7S5l53u6gl0f',$bCrlf);
$sbPem->AppendLine('ULuQbt7Hr3THznlNFKkGT1/yVNt2QOm1emZd55LaNe8E7XsNSlhl0grYQ+Ue8Jba',$bCrlf);
$sbPem->AppendLine('x85OapltVjxM9wVCwbgFyi04ihdKHo9e+uYKeTGKv0hU5O7HEH1ev6t/s2u/UG6h',$bCrlf);
$sbPem->AppendLine('TqEsYrVp0CMHpt5uAF6nZyK6GZ/CHTxh/rz1hADMofem59+e6tVtjnPGA3EjnJT8',$bCrlf);
$sbPem->AppendLine('BMOw/D2QIDxjxj2GUzz+YJp50ENhWrL9oSDkG2nzv4NVL77QIy+T/2/f4PgokUDO',$bCrlf);
$sbPem->AppendLine('QJjIfxPWE40cHGHpnQtZvEPoxP0H3T0YhmEVwuJxX3uaWOY/8Fa1c7Ln0SwWdfV5',$bCrlf);
$sbPem->AppendLine('gYvJV8o6c3sumcq1O3agPDlHC5O4IxG7AZQ8CHRDyASogzfkY6P579ZOGYaO4al7',$bCrlf);
$sbPem->AppendLine('WA1YIpsHs3/1f4SByMuWe0NVkFfvXckjpqGrBQpTmqQzk6baa0VQ0cwU3XlkwHac',$bCrlf);
$sbPem->AppendLine('WB/fQ4jylwFzZDcp5JAo53n6aU72zgNvDlGTNKwdXXZI5U3JPocH0AiZgFFWYJLd',$bCrlf);
$sbPem->AppendLine('63PJLDnjyE3i6XMVlxifXKkXVv0RYSz+ByS7Oz9aCgnQhNU8ycv+UxtfkPQih5zE',$bCrlf);
$sbPem->AppendLine('/0Y2EEFknajmFJpNXczzF8OEzaswmR0AOjcCiklZKRf61rf5faJxJhhqKEEBJuL6',$bCrlf);
$sbPem->AppendLine('oodDVRk3OGU1yQSBazT8nK3V+e6FMo3tWkra2BXFCD+pKxTy014Cp59S1w6F1Fjt',$bCrlf);
$sbPem->AppendLine('WX7eMWSLWfQ56j2kLMBHq5gb2arqlqH3fsYOTD3TNjCYF3Sgx309kVPuOK5vw61P',$bCrlf);
$sbPem->AppendLine('pnL/LN3iGY42WR+9lfAyNN2qj9zvwKwscyYs5+DPQoPmcPcVGc3v/u66bLcOGbEU',$bCrlf);
$sbPem->AppendLine('OlGa/6gdD4GCp5E4fP/7GbnEY/PW2abquFhGB+pVdl3/4+1U/8kItlfWNZoG4FhE',$bCrlf);
$sbPem->AppendLine('gjMd7glmrdFiNJFFpf5ks1lVXGqJ4mZxqtEZrxUEwciZjm4V27a+E2KyV9NnksZ6',$bCrlf);
$sbPem->AppendLine('xF4tGPKIPsvNTV5o8ZqjiacxgbYmr2ywqDXKCgpU/RWSh1sLapqSQqbH/w0MquUj',$bCrlf);
$sbPem->AppendLine('VhVX0RMYH/foKtjagZf/KO1/mnCITl86treIdachGgR4wr/qqMjrpPUaPLCRY3JQ',$bCrlf);
$sbPem->AppendLine('00XUP1Mu6YPE0SnMYAVxZheqKHly3a1pg4Xp7YWlM671oUORs3+VENfnbIxgr+2D',$bCrlf);
$sbPem->AppendLine('TiJT9PxwpfK53Oh7RBSWHJZRuAdLUXE8DG+bl0N/QkJM6pFUxTI1AQ==',$bCrlf);
$sbPem->AppendLine('-----END RSA PRIVATE KEY-----',$bCrlf);

// The actual password for the above PEM is "passwd".
$success = $privKey->LoadEncryptedPem($sbPem->getAsString(),'passwd');
if ($success != true) {
    print $privKey->lastErrorText() . "\n";
    exit;
}

// Generate the JWK thumbprint:
print 'JWK thumbprint: ' . $privKey->getJwkThumbprint('SHA256') . "\n";

// Output:
// JWK thumbprint: QzUpUAW1Y5iksGxq3r1o3JMROR6D7FLwvRlHmDQVg0I

// --------------------------------------------------------------
// Now let's do an EC private key.  The following is an unencrypted PEM containing a 384-bit EC key..
$sbPem->Clear();
$sbPem->AppendLine('-----BEGIN PRIVATE KEY-----',$bCrlf);
$sbPem->AppendLine('MIG2AgEAMBAGByqGSM49AgEGBSuBBAAiBIGeMIGbAgEBBDAamStb0Xep3y3sWw2u',$bCrlf);
$sbPem->AppendLine('SSAdUPkgQ9Rvhlnx8XEVOYy2teh69T0on77ja02m03n8t8WhZANiAARUNSar38Rz',$bCrlf);
$sbPem->AppendLine('lKPyZFsNSGUanzpNRth0C+MikVEH8FAlDHMMpAs34dyF4IK0uxgbiEe9bQ+ieLrl',$bCrlf);
$sbPem->AppendLine('6xwFR0yaTivuwoyXC+ScGUnwnpaXmid6UUgw4ypbneHsaKuZ9JLdMAo=',$bCrlf);
$sbPem->AppendLine('-----END PRIVATE KEY-----',$bCrlf);

$success = $privKey->LoadPem($sbPem->getAsString());
if ($success != true) {
    print $privKey->lastErrorText() . "\n";
    exit;
}

// Generate the JWK thumbprint:
print 'JWK thumbprint: ' . $privKey->getJwkThumbprint('SHA256') . "\n";

// Output:
// JWK thumbprint: ABAUUfNSONFsZYvZ_o_0bsPT3qeG3jttXB09VC_ETWQ

?>