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module Rex
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  module Proto
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    module Kerberos
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      module Crypto
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        module Utils
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          def xor_strings(s1,s2)
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            l1 = s1.unpack('C*')
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            l2 = s2.unpack('C*')
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            result = xor_bytes(l1, l2)
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            result.pack('C*')
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          end
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          def xor_bytes(l1,l2)
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            result = []
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            l1.zip(l2).each do |b1,b2|
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              if b1 != nil && b2 != nil
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                result.append((b1^b2))
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              end
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            end
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            result
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          end
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        end
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      end
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    end
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  end
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end
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