Many cryptographic libraries claim certifications from national or international bodies. These certifications are tied on a specific (and often restricted) version of the library or a specific product using the library, and typically in the case of software they assure that the algorithms implemented are correct. The major certifications known are:
Obtaining such a certification is an expensive and elaborate job that has no immediate value for a continuously developed free software library (as the certification is tied to the particular version tested). While, as a free software project, we are not actively pursuing this kind of certification, GnuTLS has been FIPS-140-2 certified in several systems by third parties. If you are, interested, see Commercial Support.