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X Certificate and Key management is an interface for managing asymetric keys like RSA or DSA. It is intended as a small CA for creation and signing certificates. It uses the OpenSSL library for the cryptographic operations.
Please see the XCA homepage http://hohnstaedt.de/xca
Libnsa stands literally for "Library: Non Semper erit Aestas". It is a small C++ library which implements RSA encryption. The current version only creates the 4096 bit public and private keys.
LightCrypto is C cryptography library. It contains Big Number Library, basic crypto algorithms (3DES, DSA, RSA, ECDSA, etc), Internet Voting Scheme, and many more. Current librarie's binary is less than 1MB and it can even be smaller by user config.