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2024-08-05 22:57:28 +08:00
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+<?php
+
+/*
+ * This file is part of the Acme PHP project.
+ *
+ * (c) Titouan Galopin <galopintitouan@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace AcmePhp\Ssl;
+
+use AcmePhp\Ssl\Exception\KeyFormatException;
+use Webmozart\Assert\Assert;
+
+/**
+ * Represent a SSL Private key.
+ *
+ * @author Jérémy Derussé <jeremy@derusse.com>
+ */
+class PrivateKey extends Key
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function getResource()
+    {
+        if (!$resource = openssl_pkey_get_private($this->keyPEM)) {
+            throw new KeyFormatException(sprintf('Failed to convert key into resource: %s', openssl_error_string()));
+        }
+
+        return $resource;
+    }
+
+    public function getPublicKey(): PublicKey
+    {
+        $resource = $this->getResource();
+        if (!$details = openssl_pkey_get_details($resource)) {
+            throw new KeyFormatException(sprintf('Failed to extract public key: %s', openssl_error_string()));
+        }
+
+        // PHP 8 automatically frees the key instance and deprecates the function
+        if (\PHP_VERSION_ID < 80000) {
+            openssl_free_key($resource);
+        }
+
+        return new PublicKey($details['key']);
+    }
+
+    public static function fromDER(string $keyDER): self
+    {
+        Assert::stringNotEmpty($keyDER, __METHOD__.'::$keyDER should be a non-empty string. Got %s');
+
+        $der = base64_encode($keyDER);
+        $lines = str_split($der, 65);
+        array_unshift($lines, '-----BEGIN PRIVATE KEY-----');
+        $lines[] = '-----END PRIVATE KEY-----';
+        $lines[] = '';
+
+        return new self(implode("\n", $lines));
+    }
+}