--- /dev/null
+//
+// SOSCircleDer.h
+// sec
+//
+// Created by Richard Murphy on 1/22/15.
+//
+//
+
+#ifndef _sec_SOSCircleDer_
+#define _sec_SOSCircleDer_
+
+#include <stdio.h>
+
+size_t der_sizeof_data_or_null(CFDataRef data, CFErrorRef* error);
+
+uint8_t* der_encode_data_or_null(CFDataRef data, CFErrorRef* error, const uint8_t* der, uint8_t* der_end);
+
+const uint8_t* der_decode_data_or_null(CFAllocatorRef allocator, CFDataRef* data,
+ CFErrorRef* error,
+ const uint8_t* der, const uint8_t* der_end);
+
+#endif /* defined(_sec_SOSCircleDer_) */