BIN to HEX conversion only works properly if length of BIN is a multiple of 4

[mh-]

If the number of bits is not a multiple of 4, strange results occur, because the conversion does not extend the start of the BIN value with zeroes, like most other conversion tools would.
See

ESP-RFID-Tool/Source Code/esprfidtool/esprfidtool.ino

Line 1187 in b0bb4cc

int binCOUNT=(bin2hexBUFFlen-1);