Content #

• Content
  • Features
  • Requirements
  • Install
  • Example
  • Limitations
  • Support
  • License

Features #

This package exposes a CBOR Object Signing and Encryption RFC-9052, RFC-9053 implementation.

Requirements #

• Dart: 3.3.4+

Install #

dependencies:
    catalyst_cose: any # or the latest version on Pub

Example #

// ignore_for_file: avoid_print

import 'dart:convert';

import 'package:catalyst_cose/catalyst_cose.dart';
import 'package:cbor/cbor.dart';
import 'package:convert/convert.dart';
import 'package:cryptography/cryptography.dart';

Future<void> main() async {
  final algorithm = Ed25519();
  final keyPair = await algorithm.newKeyPairFromSeed(List.filled(32, 0));
  final privateKey = await keyPair.extractPrivateKeyBytes();
  final publicKey = await keyPair.extractPublicKey().then((e) => e.bytes);

  final payload = utf8.encode('This is the content.');

  final coseSign1 = await CatalystCose.sign1(
    privateKey: privateKey,
    payload: payload,
    kid: CborBytes(publicKey),
  );

  final verified = await CatalystCose.verifyCoseSign1(
    coseSign1: coseSign1,
    publicKey: publicKey,
  );

  print('COSE_SIGN1:');
  print(hex.encode(cbor.encode(coseSign1)));
  print('verified: $verified');

  assert(
    verified,
    'The signature proves that given COSE_SIGN1 structure has been '
    'signed by the owner of the given public key',
  );
}

Limitations #

This package supports only a subset of COSE features and algorithms. More features and algorithms are supposed to be added in the feature.

Supported features:

• COSE_SIGN_1: signature + verification

Supported algorithms:

• EdDSA: Ed25519

Support #

Post issues and feature requests on the GitHub issue tracker. Please read our CONTRIBUTING for guidelines on how to contribute.

License #

Licensed under either of Apache License, Version 2.0 or MIT license at your option.

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in this crate by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.