Open OMA DM is a open source OMA server provide a C based DM server. Database is using MySQL. Multi-thread is using libevent. Encryption library is openssl.
CryptoServer is the daemon for handling Sign-Verify, Encryption-Dencryption, Envelop-Openenvelop based on OpenSSL including the SEED symmetric algorithm (Korean Standard Symmetric Algorithm).
It's interface is just tcp/ip socket and very easy to handle