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# -*- coding: binary -*-
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module Rex
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module Proto
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module Kademlia::Util
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  # Decodes an on-the-wire representation of a Kademlia peer to its 16-character hex equivalent
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  #
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  # @param bytes [String] the on-the-wire representation of a Kademlia peer
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  # @return [String] the peer ID if valid, nil otherwise
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  def self.decode_peer_id(bytes)
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    peer_id = 0
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    return nil unless bytes.size == 16
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    bytes.unpack('VVVV').map { |p| peer_id = ((peer_id << 32) ^ p) }
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    peer_id.to_s(16).upcase
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  end
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  # TODO
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  # def encode_peer_id(id)
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  # end
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end
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end
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end
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