NISTP is an implementation of elliptic curve cryptography designed to be easy to use. Similar to NaCl, with which I hope to integrate it sometime, it combines authentication and encryption into a single function, making cryptography easy to use. NISTP puts together P256, AES256GCM into the crypto_box_p256aes256gcm function, and includes ECDSA support.
Building requires only a C compiler. To build ./configure.sh && cd bin && make. Libtomcrypt is required to build tests. PARI is required to interpret some tests, and there is an awk script for summarizing tests. There is currently no attempt to discover things. There are timing leaks from the AES implementation.
To learn how to use NISTP take a look at the examples in ./tests. The API follows the principles of the NaCl API at http://nacl.cr.yp.to: functions should combine multiple cryptographic operations and make all decisions for the user, as well as require no initialization or cleanup.
Zeroization is not done, but all data is on the stack. The primatives used in NISTP are secure and mostly standard, aside from the Schnorr signature which is here used an equivelent form. NISTP is fast, but cannot compete with Curve25519. It is much simpler then OpenSSL.