diff options
| -rw-r--r-- | lib/ayk/jcryption.rb | 106 | ||||
| -rw-r--r-- | spec/jcryption.rb | 36 |
2 files changed, 142 insertions, 0 deletions
diff --git a/lib/ayk/jcryption.rb b/lib/ayk/jcryption.rb new file mode 100644 index 0000000..ab60d34 --- /dev/null +++ b/lib/ayk/jcryption.rb @@ -0,0 +1,106 @@ +#! /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 +# +# Permission is hereby granted, free of charge, to any person obtaining +# a copy of this software and associated documentation files (the +# "Software"), to deal in the Software without restriction, including +# without limitation the rights to use, copy, modify, merge, publish, +# distribute, sublicense, and/or sell copies of the Software, and to +# permit persons to whom the Software is furnished to do so, subject to +# the following conditions: +# +# The above copyright notice and this permission notice shall be +# included in all copies or substantial portions of the Software. +# +# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, +# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF +# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND +# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE +# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION +# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION +# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. +# +#---------------------------------------------------------------------------- +# +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 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 +# +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 + 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 + end + module_function :decrypt + # + def rsa_keys key, len + '{"e":"'+key.e.to_s(16)+'","n":"'+key.n.to_s(16)+'","maxdigits":"'+(len*2/16+3).to_s+'"}' + end + module_function :rsa_keys + # + def gen_keypair bits + # therese no point to try without using openssl + require 'openssl' + OpenSSL::PKey::RSA.generate( bits ) + end + module_function :gen_keypair +end + diff --git a/spec/jcryption.rb b/spec/jcryption.rb new file mode 100644 index 0000000..a974ea1 --- /dev/null +++ b/spec/jcryption.rb @@ -0,0 +1,36 @@ +#! /usr/bin/env ruby +# -*- coding: UTF-8 -*- + +require 'ayk/jcryption' +# +describe JCryption do + # + describe 'Bignum' do + it '#to_bytes #from_bytes should work' do + 0x217962755220666f207463657073612074656577732061207369206d756e676942.should eql Bignum.from_bytes(0x217962755220666f207463657073612074656577732061207369206d756e676942.to_bytes) + end + it '#bits' do + K_BITS = 1024 + k = JCryption.gen_keypair( K_BITS ) + k.n.to_i.bits.should eql k.d.to_i.bits + k.d.to_i.bits.should eql k.d.to_i.bits + k.d.to_i.bits.should eql K_BITS + k.p.to_i.bits.should eql k.q.to_i.bits + k.q.to_i.bits.should eql k.q.to_i.bits + k.q.to_i.bits.should eql K_BITS/2 + end + end + # + describe 'JCryption' do + it 'should decrypt data' do + data = '50c412c556a9fab55b50bd0d989067b341f9cdbf12ccb65aeb69dbb360a8e0dbd2069d686873b659b1be7a4c78fe631d362dbf538a5298ecaff19f78cd859897a7317c71b51b90e0a8c03e10059b68826bfeb194a4339a0ecc4a571ba9066fcf3504ffe76e07468cbe03337d3cfebd4efe687f5da72bf694dada987cea884180 ac07cc8462ce0f3e23dafe5d19f47eb33024c91de48413a971bf3b88c159090a26933f694d868bad61517a817f57998ed57bcebcd46a4ed8661cec3e24a8cdf21595902c2fd566820382e2d4f2ee7f1f11fa87a760bcecdf46282147d2c3a1afed3797d22296abcc3b1289489e7c265b3b4223bf93cbf0bb5122c021501a4305' + d = 142955580847936812437193870755035814405124627347905842843339476660410062601811480700441889718210202009243007436072050916187661826876350920486486397010450730779696290631486871265879746303575786048408069636369193884693458677811152828648243101513361320608836252500169104146911809960770571514285315905292345077217 + n = 144356479900636891214255168759692179915080702955265792860263158994365175771327391113617049451662409039610467917872667615201472907166228721836687554904761268852157980063791071632316452235833332213934315100709197309374114347503598139080114451506623646859901230057693420846126487025125157251928362812236904436763 + h = JCryption::decrypt( data, d, n).split('&').inject({}) { |h_,vk| v,k = vk.split '='; h_[v]=k; h_ } + h['username'].should eql "my_username" + h['passwd'].should eql "my_password" + h['timestamp'].should eql "1252937955" + end + end +end +# |