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-module(catlfish_compat).
-export([unpack_issuer/1, unpack_signature/1]).
-include_lib("public_key/include/public_key.hrl").
unpack_issuer(Issuer) ->
unpack_issuer(erlang:system_info(otp_release), Issuer).
unpack_signature(Signature) ->
unpack_signature(erlang:system_info(otp_release), Signature).
%% @doc Dig out alg, params and key from issuer.
unpack_issuer("17", Issuer) ->
#'SubjectPublicKeyInfo'{
algorithm = #'AlgorithmIdentifier'{algorithm = Alg, parameters = Params},
subjectPublicKey = {0, Key}} = Issuer,
{Alg, Params, Key};
unpack_issuer("18", Issuer) ->
#'SubjectPublicKeyInfo'{
algorithm = #'AlgorithmIdentifier'{algorithm = Alg, parameters = Params},
subjectPublicKey = Key} = Issuer,
{Alg, Params, Key}.
%% @doc Unpack a #'Certificate'.signature, return the signature.
unpack_signature("17", Signature) ->
{_, Sig} = Signature,
Sig;
unpack_signature("18", Signature) ->
Signature.
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