Class: IOTA::Crypto::Hmac

Inherits:
Object
  • Object
show all
Defined in:
lib/iota/crypto/hmac.rb

Constant Summary collapse

ROUNDS =
27

Instance Method Summary collapse

Constructor Details

#initialize(key) ⇒ Hmac

Returns a new instance of Hmac.


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# File 'lib/iota/crypto/hmac.rb', line 6

def initialize(key)
  @key = Converter.trits(key)
end

Instance Method Details

#addHMAC(bundle) ⇒ Object


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# File 'lib/iota/crypto/hmac.rb', line 10

def addHMAC(bundle)
  curl = Curl.new(ROUNDS)
  (0...bundle.bundle.length).step(1) do |i|
    if bundle.bundle[i].value > 0
      bundleHashTrits = Converter.trits(bundle.bundle[i].bundle)
      hmac = Array.new(243, 0)
      curl.reset
      curl.absorb(@key)
      curl.absorb(bundleHashTrits)
      curl.squeeze(hmac)
      hmacTrytes = Converter.trytes(hmac)
      bundle.bundle[i].signatureMessageFragment = hmacTrytes + bundle.bundle[i].signatureMessageFragment[81...2187]
    end
  end
end