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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
...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.