SSL_CTX_set_srp_username_callback
SSL_CTX_set_srp_username_callback(ctx, ssl_srp_server_param_cb);
int SSL_CTX_set_srp_username_callback(SSL_CTX *ctx,
SSL_CTX_set_srp_username_callback(server_ctx, server_srp_cb);
SSL_CTX_set_srp_username_callback(server2_ctx, server_srp_cb);
if (!TEST_int_gt(SSL_CTX_set_srp_username_callback(sctx, ssl_srp_cb), 0)