1  // Copyright (c) 2019-present The Bitcoin Core developers
 2  // Distributed under the MIT software license, see the accompanying
 3  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 4  
 5  #include <core_io.h>
 6  #include <primitives/block.h>
 7  #include <primitives/transaction_identifier.h>
 8  #include <pubkey.h>
 9  #include <rpc/util.h>
10  #include <test/fuzz/fuzz.h>
11  #include <uint256.h>
12  #include <univalue.h>
13  #include <util/strencodings.h>
14  
15  #include <algorithm>
16  #include <cassert>
17  #include <cstdint>
18  #include <string>
19  #include <vector>
20  
21  FUZZ_TARGET(hex)
22  {
23      const std::string random_hex_string(buffer.begin(), buffer.end());
24      const std::vector<unsigned char> data = ParseHex(random_hex_string);
25      const std::vector<std::byte> bytes{ParseHex<std::byte>(random_hex_string)};
26      assert(std::ranges::equal(std::as_bytes(std::span{data}), bytes));
27      const std::string hex_data = HexStr(data);
28      if (IsHex(random_hex_string)) {
29          assert(ToLower(random_hex_string) == hex_data);
30      }
31      if (uint256::FromHex(random_hex_string)) {
32          assert(random_hex_string.length() == 64);
33          assert(Txid::FromHex(random_hex_string));
34          assert(Wtxid::FromHex(random_hex_string));
35          assert(uint256::FromUserHex(random_hex_string));
36      }
37      if (const auto result{uint256::FromUserHex(random_hex_string)}) {
38          const auto result_string{result->ToString()}; // ToString() returns a fixed-length string without "0x" prefix
39          assert(result_string.length() == 64);
40          assert(IsHex(result_string));
41          assert(TryParseHex(result_string));
42          assert(Txid::FromHex(result_string));
43          assert(Wtxid::FromHex(result_string));
44          assert(uint256::FromHex(result_string));
45      }
46      try {
47          (void)HexToPubKey(random_hex_string);
48      } catch (const UniValue&) {
49      }
50      CBlockHeader block_header;
51      (void)DecodeHexBlockHeader(block_header, random_hex_string);
52      CBlock block;
53      (void)DecodeHexBlk(block, random_hex_string);
54  }