Dart

Duplicate openssl pkcs12 –export –in certfile.cer –inkey certfile.key –out certfile.pfx

See more OpenSSL Examples

How to create a PKCS12 (.p12 or .pfx) from a certificate file and private key file: Demonstrates how to duplicate this OpenSSL command:

Duplicate openssl pkcs12 –export –in certfile.cer –inkey certfile.key –out certfile.pfx

Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // This example assumes the Chilkat API to have been previously unlocked.
  // See Global Unlock Sample for sample code.

  final pkey = CkPrivateKey();

  // Load the private key from the file.
  try {
    pkey.loadAnyFormatFile('certFile.key', '');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  final cert = CkCert();
  // The LoadFromFile method auto-recognizes the format...
  try {
    cert.loadFromFile('certfile.cer');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // We'll need a cert chain object to create the PKCS12, so get it
  // from the cert.  
  final CkCertChain certChain;
  try {
    certChain = cert.getCertChain();
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Create the PFX object, add the cert and private key, and write to a .pfx file.
  final pfx = CkPfx();

  // The cert(s) are automatically added in the call to AddPrivateKey
  try {
    pfx.addPrivateKey(pkey, certChain);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Write the .pfx to a file.
  final password = 'myPassword';
  try {
    pfx.toFile(password, 'certfile.pfx');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('Success.');
}