libtasn1 is the ASN.1 library used by GnuTLS, GNU Shishi and other packages.
If you have not already done so, install the its-release package that grants access to ITS’s yum repository.
Then install as follows:
% sudo yum install libtasn1-unc
Files are installed in /opt/unc.
1. The latest version available is libtasn1 4.9. Vendor release date: July 25, 2016.
This package can be managed using the lpm command.
% lpm load libtasn1
will set the PATH, MANPATH, and LD_LIBRARY_PATH environment variable so that the libtasn1 binaries, man pages, and libraries can be accessed.