Function VerifyChecksum

src/blech32.cpp:143–153

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, Blech32 requires the
    // resulting checksum to be 1 instead. In Blech32m, this constant was amended.
    const uint64_t check = PolyMod(Cat(ExpandHRP(hrp), values));
    if (check == EncodingConstant(Encoding::BLECH32)) return Encoding::BLECH32;
    if (check == EncodingConstant(Encoding::BLECH32M)) return Encoding::BLECH32M;
    return Encoding::INVALID;
}

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