Overview
A simple module to allow repository managers to enable the creation of a checksum for objects. If enabled, the following checksum algorithms are available: MD5, SHA-1, SHA-256, SHA-384, SHA-512.
Dependencies
Downloads
Release Notes and Downloads
Installation
Unzip this module into your site's modules directory as you would any other contrib module. See this for further information.
Configuration
Enable and set checksum type in Administration » Islandora » Islandora Utility Modules » Checksum (admin/islandora/tools/checksum). To retroactively enable or modify checksums for all objects in a collection, enable and set checksum type if you have not already done so, choose a collection, and click on the 'Apply' button.
Derivative generation can be bypassed when updating only the checksumType of an object. This applies to any modules that may modify the checksumType of the object, or to objects being updated via the "Apply or Re-Apply" batch process.

Usage
Once checksums are enabled and a checksum type is set, configured datastreams will automatically be given the appropriate datastreams.
A drush command exists, islandora-checksum-update-checksums, to run the checksum updater on a collection or multiple collections. Use drush help icuc for more details.
2 Comments
Peter MacDonald
You might want to create a new screenshot of this checksum page because the misspelled word, "retractively", under the Collection drop-down has recently been fixed in HEAD to "retroactively".
Don Richards
The new one includes the same typo.