Generated on Fri Jul 11 15:55:32 -0700 2008 with rcov 0.7.0
Code reported as executed by Ruby looks like this... and this: this line is also marked as covered. Lines considered as run by rcov, but not reported by Ruby, look like this, and this: these lines were inferred by rcov (using simple heuristics). Finally, here's a line marked as not executed.
| Name | Total lines | Lines of code | Total coverage | Code coverage | ||||||||
| lib/openid/dh.rb | 89 | 62 |
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1 require "openid/util" 2 require "openid/cryptutil" 3 4 module OpenID 5 6 # Encapsulates a Diffie-Hellman key exchange. This class is used 7 # internally by both the consumer and server objects. 8 # 9 # Read more about Diffie-Hellman on wikipedia: 10 # http://en.wikipedia.org/wiki/Diffie-Hellman 11 12 class DiffieHellman 13 14 # From the OpenID specification 15 @@default_mod = 155172898181473697471232257763715539915724801966915404479707795314057629378541917580651227423698188993727816152646631438561595825688188889951272158842675419950341258706556549803580104870537681476726513255747040765857479291291572334510643245094715007229621094194349783925984760375594985848253359305585439638443 16 @@default_gen = 2 17 18 attr_reader :modulus, :generator, :public 19 20 # A new DiffieHellman object, using the modulus and generator from 21 # the OpenID specification 22 def DiffieHellman.from_defaults 23 DiffieHellman.new(@@default_mod, @@default_gen) 24 end 25 26 def initialize(modulus=nil, generator=nil, priv=nil) 27 @modulus = modulus.nil? ? @@default_mod : modulus 28 @generator = generator.nil? ? @@default_gen : generator 29 set_private(priv.nil? ? OpenID::CryptUtil.rand(@modulus-2) + 1 : priv) 30 end 31 32 def get_shared_secret(composite) 33 DiffieHellman.powermod(composite, @private, @modulus) 34 end 35 36 def xor_secret(algorithm, composite, secret) 37 dh_shared = get_shared_secret(composite) 38 packed_dh_shared = OpenID::CryptUtil.num_to_binary(dh_shared) 39 hashed_dh_shared = algorithm.call(packed_dh_shared) 40 return DiffieHellman.strxor(secret, hashed_dh_shared) 41 end 42 43 def using_default_values? 44 @generator == @@default_gen && @modulus == @@default_mod 45 end 46 47 private 48 def set_private(priv) 49 @private = priv 50 @public = DiffieHellman.powermod(@generator, @private, @modulus) 51 end 52 53 def DiffieHellman.strxor(s, t) 54 if s.length != t.length 55 raise ArgumentError, "strxor: lengths don't match. " + 56 "Inputs were #{s.inspect} and #{t.inspect}" 57 end 58 59 if String.method_defined? :bytes 60 s.bytes.zip(t.bytes).map{|sb,tb| sb^tb}.pack('C*') 61 else 62 indices = 0...(s.length) 63 chrs = indices.collect {|i| (s[i]^t[i]).chr} 64 chrs.join("") 65 end 66 end 67 68 # This code is taken from this post: 69 # <http://blade.nagaokaut.ac.jp/cgi-bin/scat.\rb/ruby/ruby-talk/19098> 70 # by Eric Lee Green. 71 def DiffieHellman.powermod(x, n, q) 72 counter=0 73 n_p=n 74 y_p=1 75 z_p=x 76 while n_p != 0 77 if n_p[0]==1 78 y_p=(y_p*z_p) % q 79 end 80 n_p = n_p >> 1 81 z_p = (z_p * z_p) % q 82 counter += 1 83 end 84 return y_p 85 end 86 87 end 88 89 end
Generated using the rcov code coverage analysis tool for Ruby version 0.7.0.