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feistel_cipher

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Encrypted integer IDs using Feistel cipher

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feistel_cipher lib feistel_cipher.ex
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lib/feistel_cipher.ex 

defmodule FeistelCipher do

  @moduledoc false



  def key_for_table(table) do

    <<key::31, _::481>> = :crypto.hash(:sha512, table)

    key

  end



  def trigger_name(table, source, target) do

    "#{table}_encrypt_#{source}_to_#{target}_trigger"

  end



  def with_defaults(opts) do

    opts = Enum.into(opts, %{prefix: default_prefix()})



    opts

    |> Map.put_new(:create_schema, opts.prefix != default_prefix())

    |> Map.put_new(:xor, default_xor())

    |> Map.put_new(:mul, default_mul())

    |> Map.put(:quoted_prefix, inspect(opts.prefix))

    |> Map.put(:escaped_prefix, String.replace(opts.prefix, "'", "\\'"))

  end



  def default_prefix do

    "public"

  end



  def default_xor do

    1_076_943_109

  end



  def default_mul do

    1_552_717_019

  end

end