add_handshake_data
int (*add_handshake_data)(SSL *ssl, enum ssl_encryption_level_t level,
if (!ssl->quic_method->add_handshake_data(ssl,
.add_handshake_data = quic_add_handshake_data,
quic_method->add_handshake_data = doq_add_handshake_data;
quic_method->add_handshake_data = doq_add_handshake_data;
quic_method.add_handshake_data = &add_handshake_data;