From 0c424c4dabfaaa7a1ccd52cae58375ebb6f2fb2e Mon Sep 17 00:00:00 2001
From: Linus Groh <mail@linusgroh.de>
Date: Tue, 21 Dec 2021 23:08:23 +0100
Subject: [PATCH] LibCrypto: Add the BigInteger concept

This makes it much easier to write (template) functions that accept
either a signed or unsigned bigint parameter.
---
 Userland/Libraries/LibCrypto/Forward.h | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 Userland/Libraries/LibCrypto/Forward.h

diff --git a/Userland/Libraries/LibCrypto/Forward.h b/Userland/Libraries/LibCrypto/Forward.h
new file mode 100644
index 0000000000..27d5bfbbfc
--- /dev/null
+++ b/Userland/Libraries/LibCrypto/Forward.h
@@ -0,0 +1,19 @@
+/*
+ * Copyright (c) 2021, the SerenityOS developers.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/Concepts.h>
+
+namespace Crypto {
+
+class SignedBigInteger;
+class UnsignedBigInteger;
+
+template<typename T>
+concept BigInteger = IsSame<T, SignedBigInteger> || IsSame<T, UnsignedBigInteger>;
+
+}