Dart

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.

Dart

import 'package:chilkat/chilkat.dart';

void main() {
  final privKey = 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...

  final sbPem = CkStringBuilder();
  final 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');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Generate the JWK thumbprint:
  print('JWK thumbprint: ${privKey.getJwkThumbprint('SHA256')}');

  // 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());
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Generate the JWK thumbprint:
  print('JWK thumbprint: ${privKey.getJwkThumbprint('SHA256')}');

  // Output:
  // JWK thumbprint: ABAUUfNSONFsZYvZ_o_0bsPT3qeG3jttXB09VC_ETWQ
}