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sha2.rb
#-- # sha2.rb - defines Digest::SHA2 class which wraps up the SHA256, # SHA384, and SHA512 classes. #++ # Copyright (c) 2006 Akinori MUSHA <knu@iDaemons.org> # # All rights reserved. You can redistribute and/or modify it under the same # terms as Ruby. # # $Id: sha2.rb 35293 2012-04-10 22:41:04Z drbrain $ require 'digest' require 'digest/sha2.so' module Digest # # A meta digest provider class for SHA256, SHA384 and SHA512. # class SHA2 < Digest::Class # call-seq: # Digest::SHA2.new(bitlen = 256) -> digest_obj # # Creates a new SHA2 hash object with a given bit length. # # Valid bit lengths are 256, 384 and 512. def initialize(bitlen = 256) case bitlen when 256 @sha2 = Digest::SHA256.new when 384 @sha2 = Digest::SHA384.new when 512 @sha2 = Digest::SHA512.new else raise ArgumentError, "unsupported bit length: %s" % bitlen.inspect end @bitlen = bitlen end # call-seq: # digest_obj.reset -> digest_obj # # Resets the digest to the initial state and returns self. def reset @sha2.reset self end # call-seq: # digest_obj.update(string) -> digest_obj # digest_obj << string -> digest_obj # # Updates the digest using a given _string_ and returns self. def update(str) @sha2.update(str) self end alias << update def finish # :nodoc: @sha2.digest! end private :finish # call-seq: # digest_obj.block_length -> Integer # # Returns the block length of the digest in bytes. # # Digest::SHA256.new.block_length * 8 # # => 512 # Digest::SHA384.new.block_length * 8 # # => 1024 # Digest::SHA512.new.block_length * 8 # # => 1024 def block_length @sha2.block_length end # call-seq: # digest_obj.digest_length -> Integer # # Returns the length of the hash value of the digest in bytes. # # Digest::SHA256.new.digest_length * 8 # # => 256 # Digest::SHA384.new.digest_length * 8 # # => 384 # Digest::SHA512.new.digest_length * 8 # # => 512 # # For example, digests produced by Digest::SHA256 will always be 32 bytes # (256 bits) in size. def digest_length @sha2.digest_length end def initialize_copy(other) # :nodoc: @sha2 = other.instance_eval { @sha2.clone } end def inspect # :nodoc: "#<%s:%d %s>" % [self.class.name, @bitlen, hexdigest] end end end
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hmac.rb
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2023-07-26 02:09:00
sha2.rb
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2023-07-26 02:09:00