Compilation option to use a specific ssl client auth engine automatically.

ssl/ssl_lib.c

@@ -1599,6 +1599,22 @@ SSL_CTX *SSL_CTX_new(const SSL_METHOD *meth)
 	ret->wbuf_freelist->len = 0;
 	ret->wbuf_freelist->head = NULL;
 #endif
+#ifndef OPENSSL_NO_ENGINE
+	ret->client_cert_engine = NULL;
+#ifdef OPENSSL_SSL_CLIENT_ENGINE_AUTO
+#define eng_strx(x)	#x
+#define eng_str(x)	eng_strx(x)
+	/* Use specific client engine automatically... ignore errors */
+	{
+	ENGINE *eng;
+	eng = ENGINE_by_id(eng_str(OPENSSL_SSL_CLIENT_ENGINE_AUTO));
+fprintf(stderr, "Engine is %p\n", eng);
+	if (!eng || !SSL_CTX_set_client_cert_engine(ret, eng))
+		ERR_clear_error();
+	}
+#endif
+#endif
+
 	return(ret);
 err:
 	SSLerr(SSL_F_SSL_CTX_NEW,ERR_R_MALLOC_FAILURE);