module Crc32Cracker
Constants
- VERSION
Public Class Methods
crc32_check(str, js_32_bit = true)
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# File lib/crc32_cracker.rb, line 14 def self.crc32_check(str, js_32_bit = true) table = Zlib::crc_table.map {|el| el.to_s(16).upcase} # hex crc32 table crc = 0 crc = crc ^ (-1) max_32_int = (2**32) str.length.times do |k| a = (crc >> 8) b = ("0x" + table[((crc ^ str[k].ord ) & 0x000000FF)]).to_i(16) crc = (a ^ b) if js_32_bit # See http://stackoverflow.com/questions/17056263/getting-the-same-result-from-ruby-as-javascript-for-bitwise-xor?noredirect=1#comment24669730_17056263 if crc > (max_32_int/2) crc = crc - max_32_int elsif crc < -(max_32_int/2) crc = crc + max_32_int end end end crc = crc ^ (-1) crc = crc.abs return crc end
crc32_crack(start_letter, end_letter, length, salt, hash)
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# File lib/crc32_cracker.rb, line 4 def self.crc32_crack(start_letter, end_letter, length, salt, hash) # Gets the crc32 code of the given length using the range from a start_letter...end_letter that matches the salt/hash (start_letter..end_letter).to_a.repeated_permutation(length.to_i).each do |guess| guess = guess.join return guess if (crc32_check(guess + salt).to_i == hash.to_i) end end