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hotp

1.0.2

1.0.2 1.0.1

HMAC-Based One-Time Password Algorithm, as described in RFC 4226

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hotp src hotp_hmac.erl

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src/hotp_hmac.erl

-module(hotp_hmac).

-export_type(
    [ hash_algo/0
    ]).

-export(
    [ cons/3
    , hash_algos_supported/0
    ]).

-type hash_algo() ::
      sha
    | sha256
    | sha512
    .

-spec cons(hash_algo(), binary(), binary()) ->
    binary().
cons(HashAlgo, <<Secret/binary>>, <<Data/binary>>) ->
    crypto:hmac(HashAlgo, Secret, Data).

-spec hash_algos_supported() ->
    [hash_algo()].
hash_algos_supported() ->
    [ sha
    , sha256
    , sha512
    ].

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