what are the libraries that support Arduino Mega 2560 for ECC implementation.

I am doing a project related to implementation of Elliptic curve cryptography protocol.I want to know what are the libraries that support Arduino Mega 2560 platform and also the implementation of Elliptic curve cryptography (ECC). Please suggest some cryptographic libraries (except Relic) compatible for this purpose.

http://arduino.cc/forum/index.php/topic,41318.0.html
http://avrcryptolib.das-labor.org/trac