/usr/include/mrmpi/hash.h is in libmrmpi-dev 1.0~20140404-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | // Hash function hashlittle()
// from lookup3.c, by Bob Jenkins, May 2006, Public Domain
// bob_jenkins@burtleburtle.net
uint32_t hashlittle(const void *key, size_t length, uint32_t);
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