create_a_psk
SSL_SESSION *create_a_psk(SSL *ssl, size_t mdsize);
clientpsk = serverpsk = create_a_psk(clientquic, SHA384_DIGEST_LENGTH);
clientpsk = serverpsk = create_a_psk(clientssl, SHA384_DIGEST_LENGTH);
clientpsk = create_a_psk(*clientssl, mdsize);