Encryption/Decryption using x509 in RDP Protocol

Hi, I need expert freelancer/company who has worked with RDP client, have expert knowledge of RDP Protocol, and have expert in security protocol. 1. He/she have to write parser of x509 certificate chain(which is already sniffed from network and stored in byte array). 2. Parser of individual x509 certificate from x509 certificate chain. 2. Data encryption and decryption function using x509 certificate for RDP Protocol. (assume that private key already saved with you, and get public key from x509 certificate chain). code must be writen in C#. Thanks,