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authorknu <knu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2006-10-20 12:48:35 +0000
committerknu <knu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2006-10-20 12:48:35 +0000
commitb2c7fe1bbffe9e5fe741b7dd3725017b55250c1e (patch)
tree357017c76c382d89ee3c3f359e14a2496f095635 /ext/digest/sha2/lib
parent03f19e27ed9dc0b0110dce0108626d414e00fca2 (diff)
* ext/digest: Prefix C constants with RUBY_ and C type names with
rb_ to avoid name clash in writing extensions. * ext/digest: Introduce Digest::Class and Digest::Instance for ease of implementing subclasses and add-ons, inspried by gotoyuzo. * ext/digest: The Digest::Instance module now requires and assumes that any instance be resettable and clonable, and add some convenient instance methods such as "new()", for creating a new copy, parameter taking "digest()" and "hexdigest()", for instant calculation. These methods make digest instances work just like digest classes. * ext/digest/sha2/lib/digest/sha2.rb: Add the Digest::SHA2 class to wrap up SHA2 variants: SHA256, SHA384 and SHA512, hoping this module would make a decent example of a digest subclass written in Ruby. * ext/digest/lib/digest.rb: Adjust autoload entries for SHA2 classes. * ext/digest/lib/digest/hmac.rb: Follow the framework updates. git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@11197 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'ext/digest/sha2/lib')
-rw-r--r--ext/digest/sha2/lib/digest/sha2.rb73
1 files changed, 73 insertions, 0 deletions
diff --git a/ext/digest/sha2/lib/digest/sha2.rb b/ext/digest/sha2/lib/digest/sha2.rb
new file mode 100644
index 00000000000..683b9904a36
--- /dev/null
+++ b/ext/digest/sha2/lib/digest/sha2.rb
@@ -0,0 +1,73 @@
+#--
+# 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.
+#
+# $Id$
+
+require 'digest'
+
+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.
+ 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
+
+ # :nodoc:
+ def reset
+ @sha2.reset
+ self
+ end
+
+ # :nodoc:
+ def update(str)
+ @sha2.update(str)
+ self
+ end
+ alias << update
+
+ def finish
+ @sha2.digest!
+ end
+ private :finish
+
+ def block_length
+ @sha2.block_length
+ end
+
+ def digest_length
+ @sha2.digest_length
+ end
+
+ # :nodoc:
+ def initialize_copy(other)
+ @sha2 = @sha2.clone
+ end
+
+ # :nodoc:
+ def inspect
+ "#<%s:%d %s>" % [self.class.name, @bitlen, hexdigest]
+ end
+ end
+end