Created
January 21, 2016 04:48
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Code used to solve Toyota from ShmooCon 2016
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def hex_to_bytes(str) | |
str.chars.each_slice(2).map {|s| s.join.to_i(16)} | |
end | |
def hex_to_bits(str) | |
str.chars.each_slice(2).flat_map {|s| s.join.to_i(16).to_s(2).rjust(8,"0").split("")} | |
end | |
def bytes_to_binary(bytes) | |
bytes.flat_map {|b| b.to_s(2).rjust(8,"0").split("")} | |
end | |
bicycle = "BICYCLE".bytes | |
lines = [ | |
"BDB6BCA6BCB3B5538938B26CF1503617C9236C0", | |
"9D855F7C1A2831944BDB9BCAA5D243EB2323D3E", | |
"37F2A92D8606D324B3CADD892002ACEE38B61F7", | |
"D236EB5F8552C3DA384B344543EBCA6BCB3BABD" | |
] | |
line = lines.join | |
bytes = hex_to_bytes(line) | |
xored = [] | |
bytes.each_with_index do |b,i| | |
xored << (b ^ bicycle[i % bicycle.length]) | |
end | |
bits = bytes_to_binary(xored) | |
c = 0 | |
str = "" | |
bits.each_with_index do |b,i| | |
if c % 25 == 0 | |
str << "\n" | |
end | |
c += 1 | |
str << b | |
end | |
str = str.gsub("0", " ").gsub("1", "▒") | |
puts str |
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