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ecies

1.0.0
1.1.0 1.0.0

Customizable Erlang native ECIES public-key cryptography library, providing elliptic curve encryption as an alternative to the deprecated crypto public_encrypt, private_decrypt functions

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ecies src ecies_bitcore.erl
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src/ecies_bitcore.erl 

-module(ecies_bitcore).



-export([default_params/0, params/1]).



default_params() ->

  #{

    curve => secp256k1,

    mac => {hmac, sha256, 256},

    kdf => fun kdf/3,

    iv  => fun iv/1,

    embedded_iv => true

  }.



params(Params) ->

  maps:merge(default_params(), Params).



% bitcore specific overrides

kdf(SharedKey, _Info, 64) ->

  crypto:hash(sha512, SharedKey).



iv(State) ->

  % bitcore uses deterministic IV generation but actually embeds it in final payload,

  % so could be standard one as well

  #{ key := {_PublicKey, PrivateKey}, plain_text := PlainText, iv_length := IVLen } = State,

  <<IV:IVLen/bytes, _/binary>> = crypto:mac(hmac, sha256, PrivateKey, PlainText),

  {ok, State#{ iv => IV }}.