fromWallet static method

Future<RequestDidPowerUp> fromWallet({ required Wallet wallet, required String pairwiseDid, required List<StdCoin> amount, required CommercioRSAPrivateKey privateKey, Client? client, })

Creates a RequestDidPowerUpHelper from the given wallet, pairwiseDid, amount and privateKey

Implementation

static Future<RequestDidPowerUp> fromWallet({
  required Wallet wallet,
  required String pairwiseDid,
  required List<StdCoin> amount,
  required CommercioRSAPrivateKey privateKey,
  http.Client? client,
}) async {
  // Get the timestamp
  final timestamp = DateTime.now().toUtc().millisecondsSinceEpoch.toString();
  final senderDid = wallet.bech32Address;

  // Build and sign the signature
  final signedSignatureHash = SignHelper.signPowerUpSignature(
    senderDid: senderDid,
    pairwiseDid: pairwiseDid,
    timestamp: timestamp,
    rsaPrivateKey: privateKey,
  );

  // Build the payload
  final payload = DidPowerUpRequestPayload(
    senderDid: senderDid,
    pairwiseDid: pairwiseDid,
    timestamp: timestamp,
    signature: base64Encode(signedSignatureHash),
  );

  // =============
  // Encrypt proof
  // =============

  // Generate an AES-256 key
  final aesKey = await KeysHelper.generateAesKey();

  // Encrypt the payload
  final encryptedProof = EncryptionHelper.encryptStringWithAesGCM(
    jsonEncode(payload),
    aesKey,
  );

  // =================
  // Encrypt proof key
  // =================

  // Encrypt the key using the Tumbler public RSA key
  final rsaPubTkKey = await EncryptionHelper.getGovernmentRsaPubKey(
    wallet.networkInfo.lcdUrl,
    client: client,
  );
  final encryptedProofKey =
      EncryptionHelper.encryptBytesWithRsa(aesKey, rsaPubTkKey.publicKey);

  // Build the RequestDidPowerUp
  return RequestDidPowerUp(
    claimantDid: senderDid,
    amount: amount,
    powerUpProof: base64Encode(encryptedProof),
    uuid: const Uuid().v4(),
    encryptionKey: base64Encode(encryptedProofKey),
  );
}