Dart

Encrypt using Cert to produce -----BEGIN PKCS7----- ... -----END PKCS7-----

See more Encryption Examples

Demonstrates how to encrypt using a certificate to produce output such as:

-----BEGIN PKCS7-----
MIIHPwYJKoZIhvcNAQcEoIIHMDCCBywC ...
...
...
-----END PKCS7-----

The certificate to be used is not your own, but the certificate of the intended recipient of the message. Dart

import 'package:chilkat/chilkat.dart';

void main() {
  var success = false;

  // This example requires the Chilkat API to have been previously unlocked.
  // See Global Unlock Sample for sample code.

  final crypt = CkCrypt2();

  // Specify the encryption to be used.
  // "pki" indicates "Public Key Infrastructure" and will create a PKCS7 encrypted (enveloped) message.
  crypt.cryptAlgorithm = 'pki';
  crypt.pkcs7CryptAlg = 'aes';
  crypt.keyLength = 128;
  crypt.oaepHash = 'sha256';
  crypt.oaepPadding = true;

  // A certificate is needed as the encryption key..
  final cert = CkCert();
  success = true;
  try {
    cert.loadFromFile('qa_data/certs/testCert.pem');
  } on ChilkatException {
    success = false;
  }
  if (!success) {
    print(cert.lastErrorText);
    return;
  }

  // Tell the crypt object to use the certificate.
  crypt.setEncryptCert(cert);

  final toBeEncrypted = 'This string is to be encrypted.';

  // Get the result in multi-line BASE64 MIME format.
  crypt.encodingMode = 'base64_mime';

  final encryptedStr = crypt.encryptStringENC(toBeEncrypted);
  if (!success) {
    print(crypt.lastErrorText);
    return;
  }

  // Make a "-----BEGIN PKCS7-----" ... "-----END PKCS7-----" sandwich...
  final sb = CkStringBuilder();
  sb.appendLine('-----BEGIN PKCS7-----', true);
  sb.append(encryptedStr);
  sb.appendLine('-----END PKCS7-----', true);

  final outStr = sb.getAsString();

  print(outStr);

  // Sample output:

  // -----BEGIN PKCS7-----
  // MIICYQYJKoZIhvcNAQcDoIICUjCCAk4CAQAxggH5MIIB9QIBADCBsTCBmzELMAkGA1UEBhMCR0Ix
  // GzAZBgNVBAgTEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4GA1UEBxMHU2FsZm9yZDEaMBgGA1UEChMR
  // Q09NT0RPIENBIExpbWl0ZWQxQTA/BgNVBAMTOENPTU9ETyBTSEEtMjU2IENsaWVudCBBdXRoZW50
  // aWNhdGlvbiBhbmQgU2VjdXJlIEVtYWlsIENBAhEAuBl4qE2MODB05C5h53M5UDA4BgkqhkiG9w0B
  // AQcwK6APMA0GCWCGSAFlAwQCAQUAoRgwFgYJKoZIhvcNAQEIMAkGBSsOAwIaBQAEggEAyZejlE37
  // awl0bCWVbOCqf9yLSN17mZRamG8FHDh3nNu11G0+oyJtsPDEnSKsQig0V67MZ+hcWV+uf4ytcjyx
  // H0gs5uex+LwkB+c3ZTOt18IYWFtRilg1HFy1ZN3t0D2QbxYy+i1TXOOwp3gAHL45vRCJ0FbKyQ36
  // pKl0XLe+lRvp2EiJCKVjxtX8VcZOKT4xkG7yOARaCQceth6pA58Dg0yzAz7w4nD2UgAlNzrXG69X
  // e+7e7yfBv47RRqFiQqDpCn+fM/PmFbUyqBppMwc64yP+fJek8VyJw2/UaXWWM4iSKSflk90tiHwf
  // loEU3It4arnSv94fZQo0v129aBqpWzBMBgkqhkiG9w0BBwEwHQYJYIZIAWUDBAECBBCohUgm5qX+
  // TE6PxtPCmWi8gCBgbNg39emAB+AqLozm+vSLjZOGfg3M52gccKUJ8tg8XQ==
  // -----END PKCS7-----
}