Version 4.6.0

system/3rd_party/Minishlink/WebPush/Utils.php

@@ -0,0 +1,86 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of the WebPush library.
+ *
+ * (c) Louis Lagrange <lagrange.louis@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Minishlink\WebPush;
+
+use Base64Url\Base64Url;
+use Brick\Math\BigInteger;
+use Jose\Component\Core\JWK;
+use Jose\Component\Core\Util\Ecc\PublicKey;
+
+class Utils
+{
+    /**
+     * @param string $value
+     *
+     * @return int
+     */
+    public static function safeStrlen(string $value): int
+    {
+        return mb_strlen($value, '8bit');
+    }
+
+    /**
+     * @param PublicKey $publicKey
+     *
+     * @return string
+     */
+    public static function serializePublicKey(PublicKey $publicKey): string
+    {
+        $hexString = '04';
+        $point = $publicKey->getPoint();
+        if ($point->getX() instanceof BigInteger) {
+            $hexString .= str_pad($point->getX()->toBase(16), 64, '0', STR_PAD_LEFT);
+            $hexString .= str_pad($point->getY()->toBase(16), 64, '0', STR_PAD_LEFT);
+        } else { // @phpstan-ignore-line
+            $hexString .= str_pad(gmp_strval($point->getX(), 16), 64, '0', STR_PAD_LEFT);
+            $hexString .= str_pad(gmp_strval($point->getY(), 16), 64, '0', STR_PAD_LEFT); // @phpstan-ignore-line
+        }
+
+        return $hexString;
+    }
+
+    /**
+     * @param JWK $jwk
+     *
+     * @return string
+     */
+    public static function serializePublicKeyFromJWK(JWK $jwk): string
+    {
+        $hexString = '04';
+        $hexString .= str_pad(bin2hex(Base64Url::decode($jwk->get('x'))), 64, '0', STR_PAD_LEFT);
+        $hexString .= str_pad(bin2hex(Base64Url::decode($jwk->get('y'))), 64, '0', STR_PAD_LEFT);
+
+        return $hexString;
+    }
+
+    /**
+     * @param string $data
+     *
+     * @return array
+     */
+    public static function unserializePublicKey(string $data): array
+    {
+        $data = bin2hex($data);
+        if (mb_substr($data, 0, 2, '8bit') !== '04') {
+            throw new \InvalidArgumentException('Invalid data: only uncompressed keys are supported.');
+        }
+        $data = mb_substr($data, 2, null, '8bit');
+        $dataLength = self::safeStrlen($data);
+
+        return [
+            hex2bin(mb_substr($data, 0, $dataLength / 2, '8bit')),
+            hex2bin(mb_substr($data, $dataLength / 2, null, '8bit')),
+        ];
+    }
+}