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Showing content from https://docs.ruby-lang.org/en/master/Digest.html below:

module Digest - Documentation for Ruby 3.5

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.

require 'digest'


Digest::SHA256.digest 'message'       

sha256 = Digest::SHA256.new
sha256.digest 'message'               


Digest::SHA256.hexdigest 'message'    
Digest::SHA256.base64digest 'message' 


md5 = Digest::MD5.new
md5.update 'message1'
md5 << 'message2'                     

md5.hexdigest                         


sha256 = Digest::SHA256.file 'testfile'
sha256.hexdigest

Additionally digests can be encoded in “bubble babble” format as a sequence of consonants and vowels which is more recognizable and comparable than a hexadecimal digest.

require 'digest/bubblebabble'

Digest::SHA256.bubblebabble 'message' 

See the bubble babble specification at web.mit.edu/kenta/www/one/bubblebabble/spec/jrtrjwzi/draft-huima-01.txt.

Different digest algorithms (or hash functions) are available:

MD5

See RFC 1321 The MD5 Message-Digest Algorithm

RIPEMD-160

As Digest::RMD160. See homes.esat.kuleuven.be/~bosselae/ripemd160.html.

SHA1

See FIPS 180 Secure Hash Standard.

SHA2 family

See FIPS 180 Secure Hash Standard which defines the following algorithms:

• SHA512

• SHA384

• SHA256

The latest versions of the FIPS publications can be found here: csrc.nist.gov/publications/PubsFIPS.html.

REQUIRE_MUTEX

A mutex for Digest().

VERSION

static VALUE
rb_digest_s_bubblebabble(VALUE klass, VALUE str)
{
    return bubblebabble_str_new(str);
}

Returns a BubbleBabble encoded version of a given string.

static VALUE
rb_digest_s_hexencode(VALUE klass, VALUE str)
{
    return hexencode_str_new(str);
}

Generates a hex-encoded version of a given string.

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