How to verfiy a software or file checksum value (SHA1, MD5, CRC…)
Often time, while you downloaded files or software via secure website, it’s always comes with “Checksum” values in MD5 or SHA1 format to protect users to downloading corrupted files or trojan infected files. Unfortunately, many users have no idea how to verify the downloaded file with “Checksum” value, end up in downloading virus or trojan infected files.
Here are two tools that help you verify “checksum” value easily.
1. Marxio File Checksum Verifier
Software Name : Marxio File Checksum Verifier
Website : http://www.marxio-tools.net/en/marxio-fcv.php
Version : 1.3.4
The Marxio File Checksum Verifier is a handy freeware tool which can help you to calculate and verify Checksum value in following major checksum types.
- CRC32,MD4,MD5,SHA1,SHA-256,SHA-384,SHA-512,RIPEMD-128,RIPEMD-160,HAVAL 256,TIGER 192.
2. Jacksum
Software Name : Jacksum
Website : http://www.jonelo.de/java/jacksum/index.html
Version : 1.7.0
The Jacksum is a freeware tool and suitable for more advanced users verify checksum values. It is platform independent software (support Windows and Unix) and supports 58 popular standard algorithms (Adler32, BSD sum, Bzip2′s CRC-32, POSIX cksum, CRC-8, CRC-16, CRC-24, CRC-32 (FCS-32), CRC-64, ELF-32, eMule/eDonkey, FCS-16, GOST R 34.11-94, HAS-160, HAVAL (3/4/5 passes, 128/160/192/224/256 bits), MD2, MD4, MD5, MPEG-2′s CRC-32, RIPEMD-128, RIPEMD-160, RIPEMD-256, RIPEMD-320, SHA-0, SHA-1, SHA-224, SHA-256, SHA-384, SHA-512, Tiger-128, Tiger-160, Tiger, Tiger2, Tiger Tree Hash, Tiger2 Tree Hash, Unix System V sum, sum8, sum16, sum24, sum32, Whirlpool-0, Whirlpool-1, Whirlpool and xor8).
The Jacksum is written in Java and open source, you can download the source code and try to understand how Jacksum implement the above algorithm.
Conclusion
Please do the “Checksum” value checking if “Checksum” value is provided from the download website, this is very good mechanism to ensure you are downloading what you expected to download. 
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There is also a simple application “Checksums calculator” a GUI tool to calculate md5, sha1, sha256, sha384, sha512 witch can run under Linux, Windows and MacOS X operating systems on both 32 and 64bit architectures. For more info take a look here: http://www.sinf.gr/en/hashcalc.html
Thanks for your suggestion
Jacks is excellent. I always knew what it was and saw it, but never could verify before – under the assumption that if they list it it should be good. a fair assumption, but i could have been wrong about people:) It does take up much space in the send to window, since it lists all possible types. wish i could limit the types ( customize ) the send to types.
found in send to folder C:\Documents and Settings\USERNAME\SendTo\shortcuts.ink
such as: Jacksum – haval_192_5 and all the rest. I can remove most and store them in a folder and keep only SHA1 and MD5 and a few other i would need and can always move them from my store folder:) That way my send to isnt a giant screen of options:) Great program!
Thanks for your honest review on Jacksum, it’s my favor tool as well.
Nice catch! Never heard of Checksum Verifier before!
Bitser also provides some context menu checksum calculations for MD5,SHA-1,SHA-256.
http://www.bitser.org
thanks for introducing the bitser, this look promising as well.
Nice post,
it looks easy! just don’t know how couldn’t I do it my self at the first place
Keep up the good work