Function IsHex

src/commons/util/util.cpp:210–215

};

bool IsHex(const string& str) {
    for (char c : str) {
        if (HexDigit(c) < 0) return false;
    }
    return (str.size() > 0) && (str.size() % 2 == 0);
}

vector<unsigned char> ParseHex(const char* psz) {
    // convert hex dump to vector