From a2d046a334a9060fc258610ce2e23c4865bfa3b3 Mon Sep 17 00:00:00 2001
From: rikbellens <rik.bellens@appsup.be>
Date: Thu, 3 Nov 2022 16:57:37 +0100
Subject: [PATCH] feat: add support for es256k algorithm

---
 lib/src/jwa.dart   |  5 +++++
 pubspec.yaml       |  2 +-
 test/jwt_test.dart | 19 +++++++++++++++++++
 3 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/lib/src/jwa.dart b/lib/src/jwa.dart
index 3413e7a..c4b0bf4 100644
--- a/lib/src/jwa.dart
+++ b/lib/src/jwa.dart
@@ -63,6 +63,7 @@ class JsonWebAlgorithm {
     es256,
     es384,
     es512,
+    es256k,
 /*
     ps256,
     ps384,
@@ -118,6 +119,10 @@ class JsonWebAlgorithm {
   static const es512 =
       JsonWebAlgorithm('ES512', type: 'EC', use: 'sig', curve: 'P-521');
 
+  /// ECDSA using P-256 and SHA-256
+  static const es256k =
+      JsonWebAlgorithm('ES256K', type: 'EC', use: 'sig', curve: 'P-256K');
+
 /* TODO: not supported yet in crypto_keys
   /// RSASSA-PSS using SHA-256 and MGF1 with SHA-256
   static const ps256 =
diff --git a/pubspec.yaml b/pubspec.yaml
index 9123549..f96c5fe 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -10,7 +10,7 @@ environment:
   sdk: '>=2.12.0 <3.0.0'
 
 dependencies:
-  crypto_keys: '>=0.2.0 <0.4.0'
+  crypto_keys: ^0.3.0+1
   meta: ^1.1.6
   typed_data: ^1.0.0
   x509: ^0.2.1
diff --git a/test/jwt_test.dart b/test/jwt_test.dart
index d9a0f02..fba55d8 100644
--- a/test/jwt_test.dart
+++ b/test/jwt_test.dart
@@ -158,4 +158,23 @@ void main() {
     final claims = JsonWebTokenClaims.fromJson({'exp': 1300819380.0});
     expect(claims.expiry, DateTime.fromMillisecondsSinceEpoch(1300819380000));
   });
+
+  group('JWT with ES256K signature', () {
+    test('JWT with ES256K signature', () async {
+      var key = JsonWebKey.fromJson({
+        'kty': 'EC',
+        'd': 'e8HThqO0wR_Qw4pNIb80Cs0mYuCSqT6BSQj-o-tKTrg',
+        'x': 'A3hkIubgDggcoHzmVdXIm11gZ7UMaOa71JVf1eCifD8',
+        'y': 'ejpRwmCvNMdXMOjR2DodOt09OLPgNUrcKA9hBslaFU0',
+        'crv': 'P-256K',
+        'kid': '123'
+      });
+
+      var jwt = JsonWebToken.unverified(
+          'eyJhbGciOiJFUzI1NksiLCJraWQiOiIxMjMiLCJ0eXAiOiJKV1QifQ.eyJhdWQiOiJ5b3UiLCJpc3MiOiJtZSIsImV4cCI6MTU3NjQ0Mzg2NS4wLCJpYXQiOjE1NzY0NDAyNjUsIm5iZiI6MTU3NjQ0MDI2NX0.nngSyreix-Ri0H1lC4PRGYLNEktMDUag22VmSYe_SRJFd_Oh-Qag1XSLr1Pq0puym8KSVVuPYCzIh5rsuAFH6g');
+
+      var verified = await jwt.verify(JsonWebKeyStore()..addKey(key));
+      expect(verified, true);
+    });
+  });
 }