2012-06-29 05:18:28 +00:00
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# -*- coding: binary -*-
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2010-02-16 19:18:19 +00:00
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require 'openssl'
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module Net; module SSH; module Transport; module HMAC
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# The base class of all OpenSSL-based HMAC algorithm wrappers.
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class Abstract
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class <<self
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def key_length(*v)
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@key_length = nil if !defined?(@key_length)
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if v.empty?
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@key_length = superclass.key_length if @key_length.nil? && superclass.respond_to?(:key_length)
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return @key_length
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elsif v.length == 1
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@key_length = v.first
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else
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raise ArgumentError, "wrong number of arguments (#{v.length} for 1)"
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end
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end
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def mac_length(*v)
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@mac_length = nil if !defined?(@mac_length)
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if v.empty?
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@mac_length = superclass.mac_length if @mac_length.nil? && superclass.respond_to?(:mac_length)
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return @mac_length
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elsif v.length == 1
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@mac_length = v.first
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else
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raise ArgumentError, "wrong number of arguments (#{v.length} for 1)"
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end
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end
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def digest_class(*v)
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@digest_class = nil if !defined?(@digest_class)
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if v.empty?
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@digest_class = superclass.digest_class if @digest_class.nil? && superclass.respond_to?(:digest_class)
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return @digest_class
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elsif v.length == 1
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@digest_class = v.first
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else
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raise ArgumentError, "wrong number of arguments (#{v.length} for 1)"
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end
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end
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end
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def key_length
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self.class.key_length
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end
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def mac_length
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self.class.mac_length
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end
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def digest_class
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self.class.digest_class
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end
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# The key in use for this instance.
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attr_reader :key
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def initialize(key=nil)
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self.key = key
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end
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# Sets the key to the given value, truncating it so that it is the correct
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# length.
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def key=(value)
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@key = value ? value.to_s[0,key_length] : nil
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end
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# Compute the HMAC digest for the given data string.
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def digest(data)
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OpenSSL::HMAC.digest(digest_class.new, key, data)[0,mac_length]
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end
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end
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end; end; end; end
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