Dart PointyCastle Experiment

ExperimentPointyCastle.dart

import 'package:experiment/Unpacker.dart';
import 'package:pointycastle/export.dart' hide ECFieldElement, ECPoint;
import 'package:pointycastle/ecc/ecc_fp.dart';
import 'dart:convert';


/// {
///    "chain":"9uKhoi3zz9gCa6HGW/e6yqCSZIK1aA24aWokmE9WCEYxmhGmRAP6VadirVR1P/EJQThRF9HStAOLa+QJLiuaFg==",
///    "hint":0,
///    "payload":"1ENYKuJyh2ab/a7ozIyEHLFdVX+ERFIKjU5GRjgTaI4=",
///    "signature":"09m6U3mzT0G6i4wQiLOXd7uKdUyEia4BEtgHj9wKMQH7HLlIHdTQmoanSjqirBjU68KhcpqjGG4/7UdgKa8lfA==",
///    "signed":"liPEELGTockiA0KJq5UQnUrg0nPEQPbioaIt88/YAmuhxlv3usqgkmSCtWgNuGlqJJhPVghGMZoRpkQD+lWnYq1UdT/xCUE4URfR0rQDi2vkCS4rmhYAxCDUQ1gq4nKHZpv9rujMjIQcsV1Vf4REUgqNTkZGOBNojg==",
///    "uuid":"b193a1c9-2203-4289-ab95-109d4ae0d273",
///    "version":35
/// }

void main(List<String> arguments) {
  var uppAsBase64 =
      'liPEELGTockiA0KJq5UQnUrg0nPEQPbioaIt88/YAmuhxlv3usqgkmSCtWgNuGlqJJhPVghGMZoRpkQD+lWnYq1UdT/xCUE4URfR0rQDi2vkCS4rmhYAxCDUQ1gq4nKHZpv9rujMjIQcsV1Vf4REUgqNTkZGOBNojsRA09m6U3mzT0G6i4wQiLOXd7uKdUyEia4BEtgHj9wKMQH7HLlIHdTQmoanSjqirBjU68KhcpqjGG4/7UdgKa8lfA==';
  var bytes = base64.decode(uppAsBase64);
  var unpacker = Unpacker.fromList(bytes);
  var _ = unpacker.unpackListIndexed(unpacker.unpackListLength() - 1);
  var bytesConsumed = unpacker.bytesConsumed();
  var signature = unpacker.unpackBinary();
  var signatureB = base64.encode(signature);
  var signed = bytes.sublist(0, bytesConsumed);
  var signedB = base64.encode(signed);

  var expectedSigned =
      'liPEELGTockiA0KJq5UQnUrg0nPEQPbioaIt88/YAmuhxlv3usqgkmSCtWgNuGlqJJhPVghGMZoRpkQD+lWnYq1UdT/xCUE4URfR0rQDi2vkCS4rmhYAxCDUQ1gq4nKHZpv9rujMjIQcsV1Vf4REUgqNTkZGOBNojg==';
  var sameSignedData = signedB == expectedSigned;

  var expectedSignature =
      '09m6U3mzT0G6i4wQiLOXd7uKdUyEia4BEtgHj9wKMQH7HLlIHdTQmoanSjqirBjU68KhcpqjGG4/7UdgKa8lfA==';
  var sameSignatures = signatureB == expectedSignature;

  print('total_bytes=' + bytes.length.toString());
  print('total_bytes_signed=' + signed.length.toString());
  print('signed =' + signedB);
  print('signature=' + signatureB);
  print('same_signed=' + sameSignedData.toString());
  print('same_signature=' + sameSignatures.toString());


  var key = base64.decode('AJCfwa3Tfu7ydJrNdJcahTpLMi+Tkk3VTCy9u9AmbY10osu4krJibZ0CUZ0kqUnawrIIJZEYhpEFgW09j0Lp9A==');
  var keyLength = key.length;
  var keyLengthHalf = keyLength ~/ 2;
  //ecdsa-p256v1
  var  a = ECCurve_prime256v1();
  var params = ECDomainParametersImpl(a.domainName, a.curve, a.G, a.n);

  var x1b = key.sublist(0, keyLengthHalf);
  var y1b = key.sublist(keyLengthHalf, keyLength);

  // var point = params.curve.createPoint(x1b, y1b);
  // var k1 = ECPublicKey(point, params);

  /////

  var x = BigInt.parse("255528576572964601323545154709225394244601557630261293798747932549422935437");
  var y = BigInt.parse("52755925690740562257257088612280742564365253582741057443848848827679433222644");

  var point2 = params.curve.createPoint(x, y);
  var k2 = ECPublicKey(point2, params);



}