Dart

Load a JWE from a String

See more JSON Web Encryption (JWE) Examples

Demonstrates Jwe.LoadJwe, which loads a JWE from its compact serialization string so it can be decrypted.

Background. JWE (JSON Web Encryption) protects content with a content-encryption algorithm (the header enc value) while the content-encryption key is managed by the key-management algorithm (the header alg value). This example uses AES key wrapping with a symmetric wrapping key.

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Dart

import 'package:chilkat/chilkat.dart';

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

  // Load a JWE from its compact serialization string.
  final jweCompact = 'eyJhbGciOiJBMjU2S1ciLCJlbmMiOiJBMjU2R0NNIn0.<...>.<iv>.<ciphertext>.<tag>';
  try {
    jwe.loadJwe(jweCompact);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // The 256-bit key-wrapping key (base64) for recipient index 0.  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;
  }

  // The loaded JWE can now be decrypted.
  final String content;
  try {
    content = jwe.decrypt(0, 'utf-8');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print(content);
}