diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/ayk/jcryption.rb | 75 |
1 files changed, 4 insertions, 71 deletions
diff --git a/lib/ayk/jcryption.rb b/lib/ayk/jcryption.rb index 6e4d1ed..3b4871f 100644 --- a/lib/ayk/jcryption.rb +++ b/lib/ayk/jcryption.rb @@ -1,14 +1,7 @@ #! /usr/bin/env ruby # -*- coding: UTF-8 -*- - -#---------------------------------------------------------------------------- # -# File : jcryption.rb -# Author : Jérémy Zurcher <jeremy@asynk.ch> -# Date : 11/09/09 -# License : -# -# Copyright (c) 2009 Jérémy Zurcher +# Copyright (c) 2009-2011 Jérémy Zurcher # # Permission is hereby granted, free of charge, to any person obtaining # a copy of this software and associated documentation files (the @@ -31,75 +24,15 @@ # #---------------------------------------------------------------------------- # -def Math.power_modulo(b, p, m) - if p == 1 - b % m - elsif (p & 0x1) == 0 - t = power_modulo(b, p >> 1, m) - (t * t) % m - else - (b * power_modulo(b, p-1, m)) % m - end -end -# -class Fixnum - def to_bytes - str = '' - int = self - while int!=0 do - int,r = int.divmod 256 - str += r.chr - end - str - end -end -# -class Bignum - # - class << self - def from_bytes bytes - val = 0 - idx = 0 - bytes.each_byte{ |b| - val += b << 8 * idx - idx += 1 - } - val - end - end - # - def to_bytes - str = '' - bint = self - while bint!=0 do - bint,r = bint.divmod 256 - str += r.chr - end - str - end - # - def bits - s = self.to_bytes - while s[-1].ord==0 - s.slice!(-1) - end - bit_len = s.length * 8 - tmp = s[-1].ord - while not tmp & 0x80 - bit_len-=1 - tmp <<=1 - end - bit_len - end -end +require 'ayk/maths' # module JCryption # def decrypt data, d, n - s = data.split(' ').inject('') do |str,block| str += ( Math::power_modulo( block.to_i(16), d, n ) ).to_bytes end + s = data.split(' ').inject('') do |str,block| str += ( Math::prime_power_modulus( block.to_i(16), d, n ) ).to_bytes end sum,crc = 0,s.slice(0,2).to_i(16) s.slice(2..-1).each_char do |char| sum += char.ord end - return ( crc == sum & 0xFF ) ? s : nil + return ( crc == sum & 0xFF ) ? s : nil end module_function :decrypt # |