/usr/include/tcti/magic.h is in libtss2-dev 0.98+20160226.d4f23cc-0ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | #pragma once
#define TCTI_MAGIC 0x7e18e9defa8bc9e2
#define TCTI_VERSION 0x1
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