diff --git a/src/cutkey.erl b/src/cutkey.erl
index af292d7..87732bf 100644
--- a/src/cutkey.erl
+++ b/src/cutkey.erl
@@ -68,7 +68,12 @@ rsa(Bits, E, Opts) when is_integer(Bits), Bits > 0, E band 1 =:= 1 ->
 	false -> erlang:error(badarg)
     end.
 
-erlint(MPInts) -> [ crypto:erlint(X) || X <- MPInts ].
+erlint(MPInts) when is_list(MPInts) -> [ erlint(X) || X <- MPInts ];
+
+erlint(<<MPIntSize:32/integer,MPIntValue/binary>>) ->
+    Bits= MPIntSize * 8,
+    <<Integer:Bits/integer>> = MPIntValue,
+    Integer.
 
 -ifdef(TEST).