secp256k1 0.1.1

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

Pure secp256k1 implement for dart language.

secp256k1 refers to the parameters of the elliptic curve used in Bitcoin's public-key cryptography, and is defined in Standards for Efficient Cryptography (SEC) (Certicom Research, http://www.secg.org/sec2-v2.pdf). Currently Bitcoin uses secp256k1 with the ECDSA algorithm, though the same curve with the same public/private keys can be used in some other algorithms such as Schnorr.

Usage

library secp256k1 uses pure dart and its basic types to represent all matters:

PrivateKey => BigInt
PublickKey => List<BigInt>(2)

A simple usage example:

      var pk1 = decodePrivateKey(
          'c37c299bb7f5ffd8d9329d052983342a8c3234ff3b3fa32a292187341f7146d7');
      var pub1 = getPublic(pk1);
      var hexPub = stringifyPublicKeyInCompress(pub1);
      expect(hexPub,
          '03a12b6218425127f186011ff4c203b8d6ea651877c46f12484b2eda492596484f');
      expect(
          parsePublicKeyFromCompress(
              '03a12b6218425127f186011ff4c203b8d6ea651877c46f12484b2eda492596484f'),
          pub1);

      var pk2 = decodePrivateKey(
          '52d62cfcf7062af53f7bec124fe9285eaa8a8963411ba613b7432be73565b6b3');
      var pub2 = getPublic(pk2);
      hexPub = stringifyPublicKey(pub2);
      expect(hexPub,
          '0449aedf74e8f87811761cf3d5fa8f8eaa42b4c657efc986939229a898b3ee27a000f9a247290fb5716c2db17dc193fd4e3f7b36a9947b477c6f0769c15fb8bf79');
      expect(
          parsePublicKey(
              '0449aedf74e8f87811761cf3d5fa8f8eaa42b4c657efc986939229a898b3ee27a000f9a247290fb5716c2db17dc193fd4e3f7b36a9947b477c6f0769c15fb8bf79'),
          pub2);

      var msg =
          'b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9'; // sha256 of 'hello world';
      var R_S = sign(pk2, msg);
      expect(verify(pub2, R_S, msg), true);
      expect(
          verify(pub1, R_S,
              'b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde8'),
          false);
      expect(
          verify(pub2, R_S,
              'b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde8'),
          false);
      expect(
          verify(pub1, [BigInt.zero, BigInt.zero],
              'b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde8'),
          false);

Features and bugs

Please file feature requests and bugs at the issue tracker.