From 75b6d96e139c65ba457120d04767a3fc1b948372 Mon Sep 17 00:00:00 2001
From: Paul Duncan <pabs@pablotron.org>
Date: Sun, 17 Sep 2023 03:31:23 -0400
Subject: add tests/fuzz

---
 tests/fuzz/Makefile  | 21 +++++++++++++++++++++
 tests/fuzz/README.md |  6 ++++++
 tests/fuzz/fuzz.c    |  7 +++++++
 tests/fuzz/sha3.c    |  1 +
 tests/fuzz/sha3.h    |  1 +
 5 files changed, 36 insertions(+)
 create mode 100644 tests/fuzz/Makefile
 create mode 100644 tests/fuzz/README.md
 create mode 100644 tests/fuzz/fuzz.c
 create mode 120000 tests/fuzz/sha3.c
 create mode 120000 tests/fuzz/sha3.h

diff --git a/tests/fuzz/Makefile b/tests/fuzz/Makefile
new file mode 100644
index 0000000..9c305a8
--- /dev/null
+++ b/tests/fuzz/Makefile
@@ -0,0 +1,21 @@
+CFLAGS=-g -fsanitize=address,fuzzer -W -Wall -Wextra -Werror -pedantic -std=c11
+APP=./fuzz-shake128
+OBJS=sha3.o fuzz.o
+CC=clang
+
+.PHONY=all clean fuzz
+
+all: $(APP)
+
+# build sample application
+$(APP): $(OBJS)
+	$(CC) -o $(APP) $(CFLAGS) $(OBJS)
+
+%.o: %.c
+	$(CC) -c $(CFLAGS) $<
+
+fuzz: $(APP)
+	$(APP)
+
+clean:
+	$(RM) -f $(APP) $(OBJS)
diff --git a/tests/fuzz/README.md b/tests/fuzz/README.md
new file mode 100644
index 0000000..2acf59d
--- /dev/null
+++ b/tests/fuzz/README.md
@@ -0,0 +1,6 @@
+# fuzz
+
+Initial fuzz testing based on [libFuzzer][].
+
+[libfuzzer]: http://libfuzzer.info/
+  "clang-based fuzzer."
diff --git a/tests/fuzz/fuzz.c b/tests/fuzz/fuzz.c
new file mode 100644
index 0000000..6045186
--- /dev/null
+++ b/tests/fuzz/fuzz.c
@@ -0,0 +1,7 @@
+#include "sha3.h"
+
+int LLVMFuzzerTestOneInput(const uint8_t *src, size_t len) {
+  uint8_t dst[128];
+  shake128_xof_once(src, len, dst, sizeof(dst));
+  return 0;
+}
diff --git a/tests/fuzz/sha3.c b/tests/fuzz/sha3.c
new file mode 120000
index 0000000..4748193
--- /dev/null
+++ b/tests/fuzz/sha3.c
@@ -0,0 +1 @@
+../../sha3.c
\ No newline at end of file
diff --git a/tests/fuzz/sha3.h b/tests/fuzz/sha3.h
new file mode 120000
index 0000000..b7c53d4
--- /dev/null
+++ b/tests/fuzz/sha3.h
@@ -0,0 +1 @@
+../../sha3.h
\ No newline at end of file
-- 
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