Encrypt a JWE with a Symmetric Wrapping Key

See more JSON Web Encryption (JWE) Examples

Demonstrates Jwe.SetWrappingKey, which sets the symmetric key-wrapping key for a recipient. The key bytes are supplied in a named encoding such as hex or base64.

import 'package:chilkat/chilkat.dart';

void main() {
  final jwe = CkJwe();

  // Protected header: AES key-wrap with AES-256-GCM content encryption.
  final header = CkJsonObject();
  header.updateString('alg', 'A256KW');
  header.updateString('enc', 'A256GCM');
  try {
    jwe.setProtectedHeader(header);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Set the symmetric key-wrapping key for recipient 0.  The key bytes are provided in the named
  // encoding (here base64).  In production, obtain the key from a secure source rather than hard-coding
  // it.
  final base64Key = 'YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU=';
  try {
    jwe.setWrappingKey(0, base64Key, 'base64');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  final String jweCompact;
  try {
    jweCompact = jwe.encrypt('This is the secret content.', 'utf-8');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print(jweCompact);
}