Function CreateChecksum

src/bech32.cpp:342–353

Create a checksum. */

/** Create a checksum. */
data CreateChecksum(Encoding encoding, const std::string& hrp, const data& values)
{
    auto enc = PreparePolynomialCoefficients(hrp, values);
    enc.insert(enc.end(), CHECKSUM_SIZE, 0x00);
    uint32_t mod = PolyMod(enc) ^ EncodingConstant(encoding); // Determine what to XOR into those 6 zeroes.
    data ret(CHECKSUM_SIZE);
    for (size_t i = 0; i < CHECKSUM_SIZE; ++i) {
        // Convert the 5-bit groups in mod to checksum values.
        ret[i] = (mod >> (5 * (5 - i))) & 31;
    }
    return ret;
}

} // namespace