Decrypt a JWE into a StringBuilder

See more JSON Web Encryption (JWE) Examples

Demonstrates Jwe.DecryptSb, which decrypts a recipient of a loaded JWE and writes the plaintext into a StringBuilder.

import 'package:chilkat/chilkat.dart';

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

  // Load the JWE compact serialization to be decrypted.
  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;
  }

  // Decrypt recipient index 0, writing the plaintext into a StringBuilder.
  final sbContent = CkStringBuilder();
  try {
    jwe.decryptSb(0, 'utf-8', sbContent);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print(sbContent.getAsString());
}