From 748d1d453480df3108d1465b8c4b8893ca97c52b Mon Sep 17 00:00:00 2001
From: Linus Nordberg <linus@nordu.net>
Date: Tue, 19 Jan 2016 16:55:12 +0100
Subject: Add compatibility layer for digging around in non-public data
 structures.

---
 src/compat.erl | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 src/compat.erl

(limited to 'src/compat.erl')

diff --git a/src/compat.erl b/src/compat.erl
new file mode 100644
index 0000000..bc3101d
--- /dev/null
+++ b/src/compat.erl
@@ -0,0 +1,29 @@
+-module(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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