decrypt method

Future<DidcommMessage> decrypt(WalletStore wallet, { Future<DidDocument> didResolver(String) = resolveDidDocument, })

Decrypt this encrypted message using keys from wallet.

Implementation

Future<DidcommMessage> decrypt(WalletStore wallet,
    {Future<DidDocument> Function(String) didResolver =
        resolveDidDocument}) async {
  _decodeProtected();
  if (protectedHeaderAlg!.startsWith('ECDH-1PU')) {
    if (protectedHeaderSkid == null) {
      throw Exception('sender id needed when using AuthCrypt');
    }
    var senderDDO = (await didResolver(protectedHeaderSkid!.split('#').first))
        .resolveKeyIds()
        .convertAllKeysToJwk();
    for (var key in senderDDO.keyAgreement!) {
      if (key is VerificationMethod) {
        if (key.publicKeyJwk!['kid'] == protectedHeaderSkid ||
            key.id == protectedHeaderSkid) {
          return decryptWithJwk(
              await _searchPrivateKey(wallet), key.publicKeyJwk);
        }
      }
    }
    throw Exception('No key found in did document');
  } else if (protectedHeaderAlg!.startsWith('ECDH-ES')) {
    return decryptWithJwk(await _searchPrivateKey(wallet));
  } else {
    throw Exception('Unknown algorithm');
  }
}