Class: Mastercoin::Message

Inherits:
Object
  • Object
show all
Defined in:
lib/mastercoin-ruby/message.rb

Direct Known Subclasses

PurchaseOffer, SellingOffer, SimpleSend

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.decode(keys, xor_target, options = {}) ⇒ Object 



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# File 'lib/mastercoin-ruby/message.rb', line 32

def self.decode(keys, xor_target, options = {})
  if keys.is_a?(Array)
    i = 1
    key_data = keys.collect do |key|
      impose = Mastercoin::Util.multiple_hash(xor_target, i)[0..-3]
      i += 1
      mangled_key = key.each_char.to_a.drop(2).reverse.drop(2).reverse.join
      if options[:return_as] == :hash
        {key => Mastercoin::Util.xor_pack_unpack_strings(impose, mangled_key)}
      elsif options[:return_as] == :array
        [key, Mastercoin::Util.xor_pack_unpack_strings(impose, mangled_key)]
      else
        Mastercoin::Util.xor_pack_unpack_strings(impose, mangled_key)
      end
    end
  else
    impose = Mastercoin::Util.multiple_hash(xor_target, 1)[0..-3]
    key = keys.each_char.to_a.drop(2).reverse.drop(2).reverse.join
    key_data = Mastercoin::Util.xor_pack_unpack_strings(impose, key)
  end
end

.decode_from_compressed_public_key(keys, xor_target) ⇒ Object 



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# File 'lib/mastercoin-ruby/message.rb', line 54

def self.decode_from_compressed_public_key(keys, xor_target)
  key_data = self.decode(keys, xor_target)
  self.decode_key_to_data(key_data)
end

.probe(keys, xor_target) ⇒ Object

TODO Build it so that we bruteforce a couple of hashing to see if we can get the right amount Dont assume the first key is the compressed key



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# File 'lib/mastercoin-ruby/message.rb', line 7

def self.probe(keys, xor_target)
  decoded_keys = Message.decode(keys[1..-1], xor_target, return_as: :array)
  decoded_keys.find_all do |key|
    (1..keys.count).collect{|x| x.to_s.rjust(2,"0")}.to_a.include?(key[1][0..1])
  end
end

.probe_and_read(keys, xor_target) ⇒ Object 



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# File 'lib/mastercoin-ruby/message.rb', line 14

def self.probe_and_read(keys, xor_target)
  result = Message.probe(keys, xor_target)

  if result.length > 1
    transaction_type = (result[0][1] + result[1][1])[2..9].to_i(16)
  else
    transaction_type = result[0][1][2..9].to_i(16)
  end

  if transaction_type == Mastercoin::TRANSACTION_SELL_FOR_BITCOIN
    Mastercoin::SellingOffer.decode_from_compressed_public_key([result[0][0], result[1][0]], xor_target)
  elsif transaction_type.to_s == Mastercoin::TRANSACTION_PURCHASE_BTC_TRADE.to_i.to_s
   Mastercoin::PurchaseOffer.decode_from_compressed_public_key(result[0][0], xor_target)
  elsif transaction_type.to_s == Mastercoin::TRANSACTION_SIMPLE_SEND.to_s
    Mastercoin::SimpleSend.decode_from_compressed_public_key(result[0][0], xor_target)
  end
end

Instance Method Details

#encode_to_compressed_public_key(xor_target) ⇒ Object 



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# File 'lib/mastercoin-ruby/message.rb', line 59

def encode_to_compressed_public_key(xor_target)
  keys = self.encode_data_to_key

  if keys.is_a?(String)
    impose = Mastercoin::Util.multiple_hash(xor_target, 1)[0..-3]
    new_key = "02" + Mastercoin::Util.xor_pack_unpack_strings(impose, keys)+ "00"
    result = mangle_key_until_valid(new_key)
  elsif keys.is_a?(Array)
    i = 1
    result = keys.collect do |key|
      impose = Mastercoin::Util.multiple_hash(xor_target, i)[0..-3]
      i += 1
      new_key = "02" + Mastercoin::Util.xor_pack_unpack_strings(impose, key)+ "00"

      mangle_key_until_valid(new_key)
    end
  end
  result
end

#mangle_key_until_valid(key) ⇒ Object 



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# File 'lib/mastercoin-ruby/message.rb', line 80

def mangle_key_until_valid(key)
  key[64..66] = Random.rand(256).to_s(16).rjust(2,"0")

  if Mastercoin::Util.valid_ecdsa_point?(key)
    return key
  else
    mangle_key_until_valid(key)
  end
end