ES256K Support added (experimental)

Author: Spomky

ES256K.php

@@ -0,0 +1,32 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2014-2019 Spomky-Labs
+ *
+ * This software may be modified and distributed under the terms
+ * of the MIT license.  See the LICENSE file for details.
+ */
+
+namespace Jose\Component\Signature\Algorithm;
+
+final class ES256K extends ECDSA
+{
+    public function name(): string
+    {
+        return 'ES256K';
+    }
+
+    protected function getHashAlgorithm(): string
+    {
+        return 'sha256';
+    }
+
+    protected function getSignaturePartLength(): int
+    {
+        return 64;
+    }
+}

Tests/P256KSignatureTest.php

@@ -0,0 +1,69 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2014-2019 Spomky-Labs
+ *
+ * This software may be modified and distributed under the terms
+ * of the MIT license.  See the LICENSE file for details.
+ */
+
+namespace Jose\Component\Signature\Algorithm\Signature;
+
+use Base64Url\Base64Url;
+use Jose\Component\Core\JWK;
+use Jose\Component\Signature\Algorithm\ES256K;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * @group unit
+ * @group NewAlgorithm
+ *
+ * @covers \Jose\Component\Signature\Algorithm\ES256K
+ *
+ * @internal
+ */
+class P256KSignatureTest extends TestCase
+{
+    /**
+     * @test
+     */
+    public function es256KVerify()
+    {
+        $key = $this->getKey();
+        $algorithm = new ES256K();
+        $data = 'Hello';
+
+        static::assertTrue($algorithm->verify($key, $data, hex2bin('9c75b9d171d9690a37f2474d4bfab5c234911cb150950ea5cbfc9aedda5ec360725cc47978de95b4efb2a3ed617c7b36b1cd0a26b536662a79d0f3ae873a7924')));
+    }
+
+    /**
+     * @test
+     */
+    public function es256KSignAndVerify()
+    {
+        $key = $this->getKey();
+        $algorithm = new ES256K();
+        $data = 'Hello';
+
+        static::assertEquals('ES256K', $algorithm->name());
+
+        $signature = $algorithm->sign($key, $data);
+
+        static::assertTrue($algorithm->verify($key, $data, $signature));
+    }
+
+    private function getKey(): JWK
+    {
+        return new JWK([
+            'kty' => 'EC',
+            'crv' => 'P-256K',
+            'd' => Base64Url::encode(hex2bin('D1592A94BBB9B5D94CDC425FC7DA80B6A47863AE973A9D581FD9D8F29690B659')),
+            'x' => Base64Url::encode(hex2bin('4B4DF318DE05BB8F3A115BF337F9BCBC55CA14B917B46BCB557D3C9A158D4BE0')),
+            'y' => Base64Url::encode(hex2bin('627EB75731A8BBEBC7D9A3C57EC4D7DA2CBA6D2A28E7F45134921861FE1CF5D9')),
+        ]);
+    }
+}