From fa80117cfdeca7e5d3a2a09b385c0e938bf701e9 Mon Sep 17 00:00:00 2001
From: practicalswift <practicalswift@users.noreply.github.com>
Date: Sat, 16 May 2020 18:18:07 +0000
Subject: tests: Add fuzzing harness for functions in script/descriptor.h

---
 src/test/fuzz/script_descriptor_cache.cpp | 42 +++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 src/test/fuzz/script_descriptor_cache.cpp

(limited to 'src/test/fuzz/script_descriptor_cache.cpp')

diff --git a/src/test/fuzz/script_descriptor_cache.cpp b/src/test/fuzz/script_descriptor_cache.cpp
new file mode 100644
index 0000000000..4bfe61cec7
--- /dev/null
+++ b/src/test/fuzz/script_descriptor_cache.cpp
@@ -0,0 +1,42 @@
+// Copyright (c) 2020 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <optional.h>
+#include <pubkey.h>
+#include <script/descriptor.h>
+#include <test/fuzz/FuzzedDataProvider.h>
+#include <test/fuzz/fuzz.h>
+#include <test/fuzz/util.h>
+
+#include <cstdint>
+#include <string>
+#include <vector>
+
+void test_one_input(const std::vector<uint8_t>& buffer)
+{
+    FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());
+    DescriptorCache descriptor_cache;
+    while (fuzzed_data_provider.ConsumeBool()) {
+        const std::vector<uint8_t> code = fuzzed_data_provider.ConsumeBytes<uint8_t>(BIP32_EXTKEY_SIZE);
+        if (code.size() == BIP32_EXTKEY_SIZE) {
+            CExtPubKey xpub;
+            xpub.Decode(code.data());
+            const uint32_t key_exp_pos = fuzzed_data_provider.ConsumeIntegral<uint32_t>();
+            CExtPubKey xpub_fetched;
+            if (fuzzed_data_provider.ConsumeBool()) {
+                (void)descriptor_cache.GetCachedParentExtPubKey(key_exp_pos, xpub_fetched);
+                descriptor_cache.CacheParentExtPubKey(key_exp_pos, xpub);
+                assert(descriptor_cache.GetCachedParentExtPubKey(key_exp_pos, xpub_fetched));
+            } else {
+                const uint32_t der_index = fuzzed_data_provider.ConsumeIntegral<uint32_t>();
+                (void)descriptor_cache.GetCachedDerivedExtPubKey(key_exp_pos, der_index, xpub_fetched);
+                descriptor_cache.CacheDerivedExtPubKey(key_exp_pos, der_index, xpub);
+                assert(descriptor_cache.GetCachedDerivedExtPubKey(key_exp_pos, der_index, xpub_fetched));
+            }
+            assert(xpub == xpub_fetched);
+        }
+        (void)descriptor_cache.GetCachedParentExtPubKeys();
+        (void)descriptor_cache.GetCachedDerivedExtPubKeys();
+    }
+}
-- 
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