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 <tinyformat.h>
 6  #include <util/bip32.h>
 7  #include <util/strencodings.h>
 8  
 9  #include <cstdint>
10  #include <cstdio>
11  #include <sstream>
12  
13  bool ParseHDKeypath(const std::string& keypath_str, std::vector<uint32_t>& keypath)
14  {
15      std::stringstream ss(keypath_str);
16      std::string item;
17      bool first = true;
18      while (std::getline(ss, item, '/')) {
19          if (item.compare("m") == 0) {
20              if (first) {
21                  first = false;
22                  continue;
23              }
24              return false;
25          }
26          // Finds whether it is hardened
27          uint32_t path = 0;
28          size_t pos = item.find('\'');
29          if (pos != std::string::npos) {
30              // The hardened tick can only be in the last index of the string
31              if (pos != item.size() - 1) {
32                  return false;
33              }
34              path |= 0x80000000;
35              item = item.substr(0, item.size() - 1); // Drop the last character which is the hardened tick
36          }
37  
38          // Ensure this is only numbers
39          const auto number{ToIntegral<uint32_t>(item)};
40          if (!number) {
41              return false;
42          }
43          path |= *number;
44  
45          keypath.push_back(path);
46          first = false;
47      }
48      return true;
49  }
50  
51  std::string FormatHDKeypath(const std::vector<uint32_t>& path, bool apostrophe)
52  {
53      std::string ret;
54      for (auto i : path) {
55          ret += strprintf("/%i", (i << 1) >> 1);
56          if (i >> 31) ret += apostrophe ? '\'' : 'h';
57      }
58      return ret;
59  }
60  
61  std::string WriteHDKeypath(const std::vector<uint32_t>& keypath, bool apostrophe)
62  {
63      return "m" + FormatHDKeypath(keypath, apostrophe);
64  }