MD5 Checksum Calculator was designed to be a small freeware utility for calculating the MD5 (Message Digest number 5) checksum values of specified files. The algorithm takes as input a message of arbitrary length and produces as output a 128 bit (16 byte) ?fingerprint? of the input (also known as a ?message digest?, ?checksum? or ?hash?). It is conjectured that it is computationally infeasible to produce two messages having the same message digest, or to produce any message having a given prespecified target message digest.