public SrtpContext() { _ctx = OpenSsl.EVP_CIPHER_CTX_new(); _txKey = new byte[SRTP_MASTER_KEY_LEN]; _txSalt = new byte[SRTP_MASTER_SALT_LEN]; _rxKey = new byte[SRTP_MASTER_KEY_LEN]; _rxSalt = new byte[SRTP_MASTER_SALT_LEN]; }