fix: Allow to extract PHARs which have a pubkey

fixtures/extract/openssl.phar.pubkey

@@ -0,0 +1,4 @@
+-----BEGIN PUBLIC KEY-----
+MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBAKuZkrHT54KtuBCTrR36+4tibd+2un9b
+aLFs3X+RHc/jDCXL8pJATz049ckfcfd2ZCMIzH1PHew8H+EMhy4CbSECAwEAAQ==
+-----END PUBLIC KEY-----

src/Console/Command/Extract.php

@@ -101,21 +101,29 @@ private static function dumpPhar(string $file, string $tmpDir): string
         // missing in which case we would not be able to create a Phar instance
         // as it requires the .phar extension.
         $tmpFile = $tmpDir.DIRECTORY_SEPARATOR.$alias;
+        $pubkey = $file.'.pubkey';
+        $intermediatePubkey = $tmpFile.'.pubkey';
 
         try {
             copy($file, $tmpFile, true);
 
+            if (file_exists($pubkey)) {
+                copy($pubkey, $intermediatePubkey, true);
+            }
+
             $phar = self::createPhar($file, $tmpFile);
 
             $phar->extractTo($tmpDir);
         } catch (Throwable $throwable) {
             remove($tmpFile);
+            remove($intermediatePubkey);
 
             throw $throwable;
         }
 
         // Cleanup the temporary PHAR.
         remove($tmpFile);
+        remove($intermediatePubkey);
 
         return $tmpDir;
     }

tests/Console/Command/ExtractTest.php

@@ -105,6 +105,16 @@ private static function pharProvider(): iterable
                     PHP,
             ],
         ];
+
+        yield 'OpenSSL signed PHAR' => [
+            self::FIXTURES.'/openssl.phar',
+            [
+                'index.php' => <<<'PHP'
+                    <?php echo "Hello, world!\n";
+
+                    PHP,
+            ],
+        ];
     }
 
     /**
@@ -155,11 +165,23 @@ public static function invalidPharPath(): iterable
             '/^Could not create a Phar or PharData instance for the file .+$/',
         ];
 
-        yield 'corrupted PHAR (was valid; got tempered with' => [
+        yield 'corrupted PHAR (was valid; got tempered with)' => [
             self::FIXTURES.'/corrupted.phar',
             InvalidPhar::class,
             '/^Could not create a Phar or PharData instance for the file .+$/',
         ];
+
+        yield 'OpenSSL signed PHAR without a pubkey' => [
+            self::FIXTURES.'/openssl-no-pubkey.phar',
+            InvalidPhar::class,
+            '/^Could not create a Phar or PharData instance for the file .+$/',
+        ];
+
+        yield 'OpenSSL signed PHAR with incorrect pubkey' => [
+            self::FIXTURES.'/incorrect-key-openssl.phar',
+            InvalidPhar::class,
+            '/^Could not create a Phar or PharData instance for the file .+$/',
+        ];
     }
 
     /**