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       1             : // Copyright (c) 2017, 2021 Pieter Wuille
       2             : // Distributed under the MIT software license, see the accompanying
       3             : // file COPYING or http://www.opensource.org/licenses/mit-license.php.
       4             : 
       5             : // Bech32 and Bech32m are string encoding formats used in newer
       6             : // address types. The outputs consist of a human-readable part
       7             : // (alphanumeric), a separator character (1), and a base32 data
       8             : // section, the last 6 characters of which are a checksum. The
       9             : // module is namespaced under bech32 for historical reasons.
      10             : //
      11             : // For more information, see BIP 173 and BIP 350.
      12             : 
      13             : #ifndef BITCOIN_BECH32_H
      14             : #define BITCOIN_BECH32_H
      15             : 
      16             : #include <stdint.h>
      17             : #include <string>
      18             : #include <vector>
      19             : 
      20             : namespace bech32
      21             : {
      22             : 
      23             : enum class Encoding {
      24             :     INVALID, //!< Failed decoding
      25             : 
      26             :     BECH32,  //!< Bech32 encoding as defined in BIP173
      27             :     BECH32M, //!< Bech32m encoding as defined in BIP350
      28             : };
      29             : 
      30             : /** Encode a Bech32 or Bech32m string. If hrp contains uppercase characters, this will cause an
      31             :  *  assertion error. Encoding must be one of BECH32 or BECH32M. */
      32             : std::string Encode(Encoding encoding, const std::string& hrp, const std::vector<uint8_t>& values);
      33             : 
      34             : struct DecodeResult
      35             : {
      36             :     Encoding encoding;         //!< What encoding was detected in the result; Encoding::INVALID if failed.
      37             :     std::string hrp;           //!< The human readable part
      38             :     std::vector<uint8_t> data; //!< The payload (excluding checksum)
      39             : 
      40          62 :     DecodeResult() : encoding(Encoding::INVALID) {}
      41          54 :     DecodeResult(Encoding enc, std::string&& h, std::vector<uint8_t>&& d) : encoding(enc), hrp(std::move(h)), data(std::move(d)) {}
      42             : };
      43             : 
      44             : /** Decode a Bech32 or Bech32m string. */
      45             : DecodeResult Decode(const std::string& str);
      46             : 
      47             : } // namespace bech32
      48             : 
      49             : #endif // BITCOIN_BECH32_H