From ce08fae13bb649824f1b6023ae5bb15b8e131a59 Mon Sep 17 00:00:00 2001
From: stelar7 <dudedbz@gmail.com>
Date: Thu, 7 Apr 2022 10:21:51 +0200
Subject: [PATCH] Meta: Add fuzzer for Poly1305

---
 Meta/Lagom/Fuzzers/CMakeLists.txt   |  1 +
 Meta/Lagom/Fuzzers/FuzzPoly1305.cpp | 23 +++++++++++++++++++++++
 2 files changed, 24 insertions(+)
 create mode 100644 Meta/Lagom/Fuzzers/FuzzPoly1305.cpp

diff --git a/Meta/Lagom/Fuzzers/CMakeLists.txt b/Meta/Lagom/Fuzzers/CMakeLists.txt
index 5c2d965f78..cbff945cd4 100644
--- a/Meta/Lagom/Fuzzers/CMakeLists.txt
+++ b/Meta/Lagom/Fuzzers/CMakeLists.txt
@@ -36,6 +36,7 @@ add_simple_fuzzer(FuzzPEM LagomCrypto)
 add_simple_fuzzer(FuzzPNGLoader LagomGfx)
 add_simple_fuzzer(FuzzPBMLoader LagomGfx)
 add_simple_fuzzer(FuzzPGMLoader LagomGfx)
+add_simple_fuzzer(FuzzPoly1305 LagomCrypto)
 add_simple_fuzzer(FuzzPPMLoader LagomGfx)
 add_simple_fuzzer(FuzzPDF LagomPDF)
 add_simple_fuzzer(FuzzQOILoader LagomGfx)
diff --git a/Meta/Lagom/Fuzzers/FuzzPoly1305.cpp b/Meta/Lagom/Fuzzers/FuzzPoly1305.cpp
new file mode 100644
index 0000000000..c9b06af162
--- /dev/null
+++ b/Meta/Lagom/Fuzzers/FuzzPoly1305.cpp
@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2022, stelar7 <dudedbz@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibCrypto/Authentication/Poly1305.h>
+#include <stddef.h>
+#include <stdint.h>
+
+extern "C" int LLVMFuzzerTestOneInput(uint8_t const* data, size_t size)
+{
+    if (size < 32)
+        return 0;
+
+    auto initial = ReadonlyBytes { data, 32 };
+    auto message = ReadonlyBytes { data + 32, size - 32 };
+
+    Crypto::Authentication::Poly1305 mac(initial);
+    mac.update(message);
+    (void)mac.digest();
+    return 0;
+}