It's a string, not an integer.

1 files changed, 4 insertions, 6 deletions

diff --git a/src/compat.erl b/src/compat.erl
index bc3101d..bbb58a1 100644
--- a/src/compat.erl
+++ b/src/compat.erl
@@ -8,22 +8,20 @@ unpack_signature(Signature) ->
     unpack_signature(erlang:system_info(otp_release), Signature).
 
 %% @doc Dig out alg, params and key from issuer.
-unpack_issuer(17, Issuer) ->
+unpack_issuer("17", Issuer) ->
     #'SubjectPublicKeyInfo'{
        algorithm = #'AlgorithmIdentifier'{algorithm = Alg, parameters = Params},
        subjectPublicKey = {0, Key}} = Issuer,
     {Alg, Params, Key};
-unpack_issuer(18, Issuer) ->
+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) ->
+unpack_signature("17", Signature) ->
     {_, Sig} = Signature,
     Sig;
-unpack_signature(18, Signature) ->
+unpack_signature("18", Signature) ->
     Signature.
-
-