onionporn.rb

#!/usr/bin/env ruby

# Ruby implementation of Tor's password hashing OpenPGP S2K algorithm

require 'securerandom'
require 'digest/sha1'

secret = 'some very secret phrase'
salt = SecureRandom.random_bytes(8)
count = 65536
salted_secret = salt + secret
hash = Digest::SHA1.new

while count > 0
  if count > salted_secret.length
    hash.update(salted_secret)
    count = count - salted_secret.length
  else
    hash.update(salted_secret[0...-count])
    count = 0
  end
end

hashed = hash.digest
salt = salt.each_byte.map { |b| b.to_s(16) }.join.upcase
indicator = 96.chr.each_byte.map { |b| b.to_s(16) }.join.upcase
torhash = hashed.each_byte.map { |b| b.to_s(16) }.join.upcase

return '16:' + salt + indicator + torhash