Libraries and header files of libtommath are all in the libtommath-devel package.
acquired package info from repodata DB: repodata/69e709f4d2852d98f12867a74015d19384fe2727ff670fd70178cdde80b1e77e-primary.sqlite.bz2
A portable number theoretic multiple-precision integer library.
LibTomMath is a free open source portable number theoretic multiple-precision integer library written entirely in C. The library is designed to provide a simple to work with API that provides fairly efficient routines that build out of the box without configuration.