Function CreateChecksum

src/blech32.cpp:156–167

Create a checksum. */

/** Create a checksum. */
data CreateChecksum(Encoding encoding, const std::string& hrp, const data& values)
{
    data enc = Cat(ExpandHRP(hrp), values);
    enc.resize(enc.size() + 12); // ELEMENTS: Append 6->12 zeroes
    uint64_t mod = PolyMod(enc) ^ EncodingConstant(encoding); // Determine what to XOR into those 6 zeroes.
    data ret(12); // ELEMENTS: 6->12
    for (size_t i = 0; i < 12; ++i) { // ELEMENTS: 6->12
        // Convert the 5-bit groups in mod to checksum values.
        ret[i] = (mod >> (5 * (11 - i))) & 31; // ELEMENTS: 5->11
    }
    return ret;
}

/** Encode a Blech32 or Blech32m string. */
std::string Encode(Encoding encoding, const std::string& hrp, const data& values) {