diff --git a/priv/csr/EST.asn1 b/priv/csr/EST.asn1
index f16c1f6..451de4c 100644
--- a/priv/csr/EST.asn1
+++ b/priv/csr/EST.asn1
@@ -1,11 +1,6 @@
 EST DEFINITIONS IMPLICIT TAGS ::= BEGIN
-
-    IMPORTS ATTRIBUTE FROM PKIX-CommonTypes-2009 ;
-
-    CsrAttrs ::= SEQUENCE SIZE (0..MAX) OF AttrOrOID
-    AttrOrOID ::= CHOICE { oid OBJECT IDENTIFIER, attribute Attribute }
-    Attribute ::= SEQUENCE {
-        type   ATTRIBUTE.&id,
-        values SET SIZE(1..MAX) OF ATTRIBUTE.&Type }
-
+  ATTRIBUTE ::= TYPE-IDENTIFIER
+  CsrAttrs ::= SEQUENCE OF AttrOrOID
+  AttrOrOID ::= CHOICE { oid OBJECT IDENTIFIER, attribute Attribute }
+  Attribute ::= SEQUENCE { type ATTRIBUTE.&id, values SET OF OBJECT IDENTIFIER }
 END
diff --git a/src/EST.erl b/src/EST.erl
index 9473ba2..352ce47 100644
--- a/src/EST.erl
+++ b/src/EST.erl
@@ -5,7 +5,7 @@
 -compile(nowarn_unused_vars).
 -dialyzer(no_improper_lists).
 -dialyzer(no_match).
--include_lib("ca/include/EST.hrl").
+-include("EST.hrl").
 -asn1_info([{vsn,'5.0.17'},
             {module,'EST'},
             {options,[warnings,ber,errors,
@@ -204,7 +204,7 @@ enc_Attribute_values(Val, TagIn) ->
    {lists:reverse(AccBytes),AccLen};
 
 'enc_Attribute_values_components'([H|T],AccBytes, AccLen) ->
-   {EncBytes,EncLen} = encode_open_type(H, []),
+   {EncBytes,EncLen} = encode_object_identifier(H, [<<6>>]),
    'enc_Attribute_values_components'(T,[EncBytes|AccBytes], AccLen + EncLen).
 
 
@@ -240,7 +240,7 @@ Res1.
    %% decode tag and length 
    %%-------------------------------------------------
 Tlv1 = match_tags(Tlv, TagIn),
-[decode_open_type_as_binary(V1, []) || V1 <- Tlv1].
+[decode_object_identifier(V1, [6]) || V1 <- Tlv1].
 
 
 
@@ -254,13 +254,6 @@ Tlv1 = match_tags(Tlv, TagIn),
 ber_decode_nif(B) ->
     asn1rt_nif:decode_ber_tlv(B).
 
-ber_encode([Tlv]) ->
-    ber_encode(Tlv);
-ber_encode(Tlv) when is_binary(Tlv) ->
-    Tlv;
-ber_encode(Tlv) ->
-    asn1rt_nif:encode_ber_tlv(Tlv).
-
 dec_subidentifiers(<<>>, _Av, Al) ->
     lists:reverse(Al);
 dec_subidentifiers(<<1:1,H:7,T/binary>>, Av, Al) ->
@@ -282,9 +275,6 @@ decode_object_identifier(Tlv, Tags) ->
         end,
     list_to_tuple([Val1, Val2 | ObjVals]).
 
-decode_open_type_as_binary(Tlv, TagIn) ->
-    ber_encode(match_tags(Tlv, TagIn)).
-
 e_object_identifier({'OBJECT IDENTIFIER', V}) ->
     e_object_identifier(V);
 e_object_identifier(V) when is_tuple(V) ->
@@ -314,11 +304,6 @@ encode_length(L) ->
 encode_object_identifier(Val, TagIn) ->
     encode_tags(TagIn, e_object_identifier(Val)).
 
-encode_open_type(Val, T) when is_list(Val) ->
-    encode_open_type(list_to_binary(Val), T);
-encode_open_type(Val, Tag) ->
-    encode_tags(Tag, Val, byte_size(Val)).
-
 encode_tags(TagIn, {BytesSoFar, LenSoFar}) ->
     encode_tags(TagIn, BytesSoFar, LenSoFar).