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I'm looking for an application that does md5/sha hash check on specific files/folders periodically and store an index file per folder for future verification. I remember such application exist in DOS days, to detect files infected by virus.

The main purpose for this is to detect corrupted copy of backup, as I understand that consumer grade hardware are not 100% error free when doing backup or file transfer from device to device. The hash can also be used to generate a list of changed files for backup.

Most of the software I can find is hash manually.

EDIT: Windows based application, preferably a shell extension which I can right click on a folder and do a checksum/verify all files in that folder. Even better if that can integrate with a backup/sync program like BeyondCopy

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What platform? Windows? – Dan D. Nov 22 '12 at 2:25
    
@DanD. It's windows based, I've updated my question. – faulty Nov 22 '12 at 2:33

I use the md5sum software from unxutils or gow. Redirect the output of md5sum to a textfile md5sum * > checkfile, then check the file with md5sum -c /path/to/checkfile

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One option is the File Checksum Integrity Verifier utility, available from Microsoft.

Summary

The File Checksum Integrity Verifier (FCIV) is a command-prompt utility that computes and verifies cryptographic hash values of files. FCIV can compute MD5 or SHA-1 cryptographic hash values. These values can be displayed on the screen or saved in an XML file database for later use and verification.

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There are any number of shell extensions for file verification. Alternately, you can directly use a backup program that incorporates MD5 validation, such as Create Synchronicity:

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