SSL_CTX_set_verify
SSL_CTX_set_verify(ctx, s_client_config.verify, verify_callback);
SSL_CTX_set_verify(ctx, s_server_config.server_verify, verify_callback);
SSL_CTX_set_verify(ctx2, s_server_config.server_verify,
SSL_CTX_set_verify(tm_ctx, s_time_config.verify, NULL);
void SSL_CTX_set_verify(SSL_CTX *ctx, int mode,
SSL_CTX_set_verify(ssl_ctx, verify, NULL);
SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER,