Hex Calculator for Programmers and Cryptanalysts
Hpmbcalc is a programmable multiple-precision hex calculator
with many utilities. You can use Hpmbcalc to perform a lot of big
number math and encryption operations, such as: square root, modular
inverse; hash, CRC, and check sum calculations; pseudo-random number
generation; primality test; hex, dec, oct, bin conversions; etc.