Parsed Modules¶

Any module that inherits from Digest::base. The following ones are actively supported:

• Digest::Adler32
• Digest::MD2
• Digest::MD4
• Digest::MD5
• Digest::SHA
• Digest::SHA1
• Digest::Whirlpool

If you have any suggestions for more modules or better output, please let us know.

Extra Options¶

Aside from the display color, there are a few other options to be customized via the "filter_digest" option key:

show_class_name

If set to true (the default) the class name will be displayed right next to the hexadecimal digest.

show_reset

If set to true (the default), the filter will add a "[reset]" tag after dumping an empty digest object. See the rationale below.

Note on dumping Digest::* objects¶

The digest operation is effectively a destructive, read-once operation. Once it has been performed, most Digest::* objects are automatically reset and can be used to calculate another digest value.

This behaviour - or, rather, forgetting about this behaviour - is a common source of issues when working with Digests.

This Data::Printer filter will not destroy your object. Instead, we work on a cloned version to display the hexdigest, leaving your original object untouched.

As another debugging convenience for developers, since the empty object will produce a digest even after being used, this filter adds by default a "[reset]" tag to indicate that the object is empty, in a 'reset' state - i.e. its hexdigest is the same as the hexdigest of a new, empty object of that same class.