tests: Add key_io fuzzing harness

1 files changed, 48 insertions, 0 deletions

diff --git a/src/test/fuzz/key_io.cpp b/src/test/fuzz/key_io.cpp
new file mode 100644
index 0000000000..f44628b0f8
--- /dev/null
+++ b/src/test/fuzz/key_io.cpp
@@ -0,0 +1,48 @@
+// 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 <chainparams.h>
+#include <key_io.h>
+#include <rpc/util.h>
+#include <script/signingprovider.h>
+#include <script/standard.h>
+#include <test/fuzz/fuzz.h>
+
+#include <cassert>
+#include <cstdint>
+#include <string>
+#include <vector>
+
+void initialize()
+{
+    SelectParams(CBaseChainParams::REGTEST);
+}
+
+void test_one_input(const std::vector<uint8_t>& buffer)
+{
+    const std::string random_string(buffer.begin(), buffer.end());
+
+    const CKey key = DecodeSecret(random_string);
+    if (key.IsValid()) {
+        assert(key == DecodeSecret(EncodeSecret(key)));
+    }
+
+    const CExtKey ext_key = DecodeExtKey(random_string);
+    if (ext_key.key.size() == 32) {
+        assert(ext_key == DecodeExtKey(EncodeExtKey(ext_key)));
+    }
+
+    const CExtPubKey ext_pub_key = DecodeExtPubKey(random_string);
+    if (ext_pub_key.pubkey.size() == CPubKey::COMPRESSED_SIZE) {
+        assert(ext_pub_key == DecodeExtPubKey(EncodeExtPubKey(ext_pub_key)));
+    }
+
+    const CTxDestination tx_destination = DecodeDestination(random_string);
+    (void)DescribeAddress(tx_destination);
+    (void)GetKeyForDestination(/* store */ {}, tx_destination);
+    (void)GetScriptForDestination(tx_destination);
+    (void)IsValidDestination(tx_destination);
+
+    (void)IsValidDestinationString(random_string);
+}