ringzer0 challenge 46

#!/usr/bin/env ruby

# FAILED

@func = "\x2B\x09\x4A\x03\x49\x0F\x0E\x14\x15\x1A\x00\x10\x3F\x1A\x71\x5C\x5B\x5B\x00\x1A\x16\x38\x06\x46\x66\x5A\x55\x30\x0A\x03\x1D\x08\x50\x5F\x51\x15\x6B\x4F\x19\x56\x00\x54\x1B\x50\x58\x21\x1A\x0F\x13\x07\x46\x1D\x58\x58\x21\x0E\x16\x1F\x06\x5C\x1D\x5C\x45\x27\x09\x4C\x1F\x07\x56\x56\x4C\x78\x24\x47\x40\x49\x19\x0F\x11\x1D\x17\x7F\x52\x42\x5B\x58\x1B\x13\x4F\x17\x26\x00\x01\x03\x04\x57\x5D\x40\x19\x2E\x00\x01\x17\x1D\x5B\x5C\x5A\x17\x7F\x4F\x06\x19\x0A\x47\x5E\x51\x59\x36\x41\x0E\x19\x0A\x53\x47\x5D\x58\x2C\x41\x0A\x04\x0C\x54\x13\x1F\x17\x60\x50\x12\x4B\x4B\x12\x18\x14\x42\x79\x4F\x1F\x56\x14\x12\x56\x58\x44\x27\x4F\x19\x56\x49\x16\x1B\x16\x14\x21\x1D\x07\x05\x19\x5D\x5D\x47\x52\x60\x46\x4C\x1E\x1D\x5F\x5F\x1C\x15\x7E\x0B\x0B\x00\x49\x51\x5F\x55\x44\x31\x52\x45\x13\x1B\x40\x5C\x46\x10\x7C\x38\x10\x19\x07\x55\x13\x44\x56\x31\x1C\x15\x19\x1B\x56\x13\x47\x58\x30\x1D\x1B\x58\x55\x1D\x57\x5D\x41\x7C\x4D\x4B\x4D\x49\x4F".unpack("C*")

def search_key(i)
  ct = @func.each_slice(9).map{|slice| slice[i]}.compact
  decodings = []
  (0..255).each do |k|
    pt = ct.map{|c| c^k}
    next if pt.any?{|c| c >= 127}
    next if pt.any?{|c| c < 32 and c != "\n".ord}
    # Possible but unlikely
    # next if pt.any?{|c| c.chr =~ /[`~?#]/ }
    p [i, k.chr, pt.map(&:chr).join]
    decodings << [i, k.chr, pt.map(&:chr).join, pt]
  end
  decodings
end

decodings = []
(0..8).each do |i|
  puts "Searching #{i}:"
  decodings << search_key(i)
end

puts "Random solutions"
100000.times do
  d = decodings.map(&:sample)
  pt = (0...@func.size).map{|i|
    ki = i % 9
    d[ki][3][i/9].chr
  }.join
  next unless pt =~ /eval/
end