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#!/usr/bin/env ruby
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#
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# This script can be used to calculate hash values for VxWorks passwords.
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#
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def hashit(inp)
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  if inp.length < 8 or inp.length > 120
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    raise RuntimeError, "The password must be between 8 and 120 characters"
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  end
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  sum   = 0
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  bytes = inp.unpack("C*")
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  bytes.each_index {|i| sum += (bytes[i] * (i + 1)) ^ (i + 1) }
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  hackit(sum)
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end
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def hackit(sum)
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  magic = 31695317
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  res = ((sum * magic) & 0xffffffff).to_s
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  res.unpack("C*").map{ |c|
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    c += 0x21 if c < 0x33
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    c += 0x2f if c < 0x37
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    c += 0x42 if c < 0x39
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    c
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  }.pack("C*")
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end
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input = ARGV.shift || "flintstone"
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$stderr.puts "[*] Hash for password '#{input}' is #{hashit(input)}"
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