Function VerifyChecksum

src/bech32.cpp:327–339

Verify a checksum. */

/** Verify a checksum. */
Encoding VerifyChecksum(const std::string& hrp, const data& values)
{
    // PolyMod computes what value to xor into the final values to make the checksum 0. However,
    // if we required that the checksum was 0, it would be the case that appending a 0 to a valid
    // list of values would result in a new valid list. For that reason, Bech32 requires the
    // resulting checksum to be 1 instead. In Bech32m, this constant was amended. See
    // https://gist.github.com/sipa/14c248c288c3880a3b191f978a34508e for details.
    auto enc = PreparePolynomialCoefficients(hrp, values);
    const uint32_t check = PolyMod(enc);
    if (check == EncodingConstant(Encoding::BECH32)) return Encoding::BECH32;
    if (check == EncodingConstant(Encoding::BECH32M)) return Encoding::BECH32M;
    return Encoding::INVALID;
}

/** Create a checksum. */
data CreateChecksum(Encoding encoding, const std::string& hrp, const data& values)