/usr/share/man/man3/HMAC.3ssl.gz is in libssl-doc 1.0.1t-1+deb8u8.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man3/hmac.3ssl.gz
/usr/share/man/man3/hmac.3ssl.gz