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Digest
This module provides a framework for message digest libraries.
You may want to look at OpenSSL::Digest as it supports more algorithms.
A cryptographic hash function is a procedure that takes data and returns a
fixed bit string: the hash value, also known as _digest_. Hash functions
are also called one-way functions, it is easy to compute a digest from a
message, but it is infeasible to generate a message from a digest.
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