FastSum - extremely fast and powerful MD5 checksums utility for your files integrity control. It calculates short and strong digests of your data via popular MD5 algorithm to use it as references checksums for ulterior data integrity verification.

FastSum - Allows to rectify the errors occurring while data transfer. For example: Network transfers, CD-R and DVD burning and much more.

It is developed for easy processing of a huge files count and has usable command-line interface.

It is an analogue of a famous md5sum Unix platform utility.

FastSum has two basic modes:

Checksums calculation - checksums are used as samples for ulterior verification of sample values with the current ones to identify the integrity of files between the verifications.

The second mode is – verification mode. During verification the checksums, values saved in this files, are compared with the current checksum values of corresponding files and FastSum warns, if they do not match.

FastSum is a powerful alternative to a weak Simple File Verification (SFV) standard that uses Cyclic Redundancy Check 32 (CRC32).