Class: Digest::MD5

Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Class Chain: self, Base, Class
Instance Chain: self, Base, Class, Instance
Inherits:	Digest::Base ::Object Digest::Class Digest::Base Digest::MD5
Defined in:	ext/digest/md5/md5init.c, ext/digest/md5/md5init.c

Overview

A class for calculating message digests using the MD5 Message-Digest Algorithm by RSA Data Security, Inc., described in RFC1321.

MD5 calculates a digest of 128 bits (16 bytes).

Examples

require 'digest'

# Compute a complete digest
Digest::MD5.hexdigest 'abc'      #=> "90015098..."

# Compute digest by chunks
md5 = Digest::MD5.new               # =>#<Digest::MD5>
md5.update "ab"
md5 << "c"                           # alias for #update
md5.hexdigest                        # => "90015098..."

# Use the same object to compute another digest
md5.reset
md5 << "message"
md5.hexdigest                        # => "78e73102..."

Class Method Summary

Class - Inherited

.base64digest	Returns the base64 encoded hash value of a given string.
.digest	Returns the hash value of a given string.
.file	Creates a digest object and reads a given file, name.
.hexdigest	Returns the hex-encoded hash value of a given string.

Instance Method Summary

Base - Inherited

#<<	Update the digest using given string and return `self`.
#block_length	Return the block length of the digest in bytes.
#digest_length	Return the length of the hash value in bytes.
#reset	Reset the digest to its initial state and return `self`.
#update	Alias for Base#<<.

Instance - Included

#<<	Updates the digest using a given string and returns self.
#==	If a string is given, checks whether it is equal to the hex-encoded hash value of the digest object.
#base64digest	If none is given, returns the resulting hash value of the digest in a base64 encoded form, keeping the digest's state.
#base64digest!	Returns the resulting hash value and resets the digest to the initial state.
#block_length	Returns the block length of the digest.
#bubblebabble	Returns the resulting hash value in a Bubblebabble encoded form.
#digest	If none is given, returns the resulting hash value of the digest, keeping the digest's state.
#digest!	Returns the resulting hash value and resets the digest to the initial state.
#digest_length	Returns the length of the hash value of the digest.
#file	Updates the digest with the contents of a given file name and returns self.
#hexdigest	If none is given, returns the resulting hash value of the digest in a hex-encoded form, keeping the digest's state.
#hexdigest!	Returns the resulting hash value in a hex-encoded form and resets the digest to the initial state.
#inspect	Creates a printable version of the digest object.
#length	Returns digest_obj.digest_length().
#new	Returns a new, initialized copy of the digest object.
#reset	Resets the digest to the initial state and returns self.
#size	Alias for Instance#length.
#to_s	Returns digest_obj.hexdigest().
#update	Alias for Instance#<<.
#finish	Finishes the digest and returns the resulting hash value.