secp256k1 0.2.0

Pure secp256k1 signature algorithm implement for dart language which uses pure dart and basic types to represent all matters

example/secp256k1_example.dart

import 'package:secp256k1/secp256k1.dart';
import 'package:test/test.dart';

void main() {
  var pk1 = PrivateKey.fromHex(
      'c37c299bb7f5ffd8d9329d052983342a8c3234ff3b3fa32a292187341f7146d7');
  var pub1 = pk1.publicKey;
  var hexPub = pub1.toCompressedHex();
  expect(hexPub,
      '03a12b6218425127f186011ff4c203b8d6ea651877c46f12484b2eda492596484f');
  expect(
      PublicKey.fromHex(
          '03a12b6218425127f186011ff4c203b8d6ea651877c46f12484b2eda492596484f'),
      pub1);

  var pk2 = PrivateKey.fromHex(
      '52d62cfcf7062af53f7bec124fe9285eaa8a8963411ba613b7432be73565b6b3');
  var pub2 = pk2.publicKey;
  hexPub = pub2.toHex();
  expect(hexPub,
      '0449aedf74e8f87811761cf3d5fa8f8eaa42b4c657efc986939229a898b3ee27a000f9a247290fb5716c2db17dc193fd4e3f7b36a9947b477c6f0769c15fb8bf79');
  expect(
      PublicKey.fromHex(
          '0449aedf74e8f87811761cf3d5fa8f8eaa42b4c657efc986939229a898b3ee27a000f9a247290fb5716c2db17dc193fd4e3f7b36a9947b477c6f0769c15fb8bf79'),
      pub2);

  var msg =
      'b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9'; // sha256 of 'hello world';
  var sig = pk2.signature(msg);
  expect(sig.verify(pub2, msg), true);
  expect(
      sig.verify(pub1,
          'b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde8'),
      false);
  expect(
      sig.verify(pub2,
          'b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde8'),
      false);
  expect(
      Signature(BigInt.zero, BigInt.zero).verify(pub1,
          'b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde8'),
      false);
}