Affinidi TDK - Cryptography

affinidi_tdk_cryptography is a library that provides encryption and decryption utilities for the Affinidi TDK, allowing developers to perform secure cryptographic operations in Dart applications.

💡NOTE: In most cases there is no need to use this package directly and instead use a higher level package or library, like affinidi_tdk_consumer_auth_provider or affinidi_tdk_auth_provider.

Table of Contents

Requirements

  • Dart SDK version ^3.6.0

Getting Started

Add the following to your pubspec.yaml file:

dependencies:
  affinidi_tdk_cryptography: ^<version_number>

Then run:

dart pub get

Usage

Here is an example of how to use the cryptographic utilities:

import 'package:affinidi_tdk_cryptography/affinidi_tdk_cryptography.dart';

void main() {
  const password = 'password';
  const salt = 'fixed_salt';

  // Encryption
  final cryptographyService = CryptographyService();
  final passwordEncryptionKey = await cryptographyService.Pbkdf2(
    password: password,
    nonce: utf8.encode(salt),
  );
  final encryptionKey = cryptographyService.getRandomBytes(32);
  final encryptedPassword = await cryptographyService.Aes256Encrypt(
    key: encryptionKey,
    data: passwordEncryptionKey,
  );

  ...

  // Decryption
  final passwordBytes = await cryptographyService.Aes256Decrypt(
    encryptedData: encryptedPassword,
    key: encryptionKey,
  );
  if (passwordBytes == null) {
    throw Exception('Failed to decrypt passwordBytes');
  }
}

Libraries

affinidi_tdk_cryptography