PHP

Compute JWK Thumbprint for RSA and EC Private Keys

See more ECC Examples

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.

Chilkat2 PHP

<?php

use Chilkat2\PrivateKey;
use Chilkat2\StringBuilder;

$privKey = new PrivateKey();

// 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 StringBuilder();
$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".
try {
    $privKey->LoadEncryptedPem($sbPem->GetAsString(), 'passwd');
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

// Generate the JWK thumbprint:
echo '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);

try {
    $privKey->LoadPem($sbPem->GetAsString());
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

// Generate the JWK thumbprint:
echo 'JWK thumbprint: ', $privKey->GetJwkThumbprint('SHA256'), "\n";

// Output:
// JWK thumbprint: ABAUUfNSONFsZYvZ_o_0bsPT3qeG3jttXB09VC_ETWQ