Class: Sc2::Hasher

Inherits:
Object
  • Object
show all
Defined in:
lib/sc2/magick/hasher.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Hasher

Returns a new instance of Hasher.



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# File 'lib/sc2/magick/hasher.rb', line 3

def initialize
  set_enc_tbl
end

Instance Method Details

#decrypt(data, seed1) ⇒ Object 



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# File 'lib/sc2/magick/hasher.rb', line 18

def decrypt data, seed1
  seed2 = 0xEEEEEEEE
  data.unpack('V*').map do |value|
    seed2 = (seed2 + @encryption_table[0x400 + (seed1 & 0xFF)]) & 0xFFFFFFFF
    value = (value ^ (seed1 + seed2)) & 0xFFFFFFFF
    seed1 = (((~seed1 << 0x15) + 0x11111111) | (seed1 >> 0x0B)) & 0xFFFFFFFF
    seed2 = (value + seed2 + (seed2 << 5) + 3) & 0xFFFFFFFF
    value
  end.pack('V*')
end

#hash_for(hash_type, s) ⇒ Object 



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# File 'lib/sc2/magick/hasher.rb', line 7

def hash_for hash_type, s
  hash_type = [:table_offset, :hash_a, :hash_b, :table].index hash_type
  seed1, seed2 = 0x7FED7FED, 0xEEEEEEEE
  s.upcase.each_byte do |c|
    value = @encryption_table[(hash_type << 8) + c]
    seed1 = (value ^ (seed1 + seed2)) & 0xFFFFFFFF
    seed2 = (c + seed1 + seed2 + (seed2 << 5) + 3) & 0xFFFFFFFF
  end
  seed1
end