Digest 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.
WWW: https://github.com/ruby/digest
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