zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/lib/libssl/openssl-1.1.1o/crypto/engine/tb_dh.c b/ap/lib/libssl/openssl-1.1.1o/crypto/engine/tb_dh.c
new file mode 100644
index 0000000..a13a139
--- /dev/null
+++ b/ap/lib/libssl/openssl-1.1.1o/crypto/engine/tb_dh.c
@@ -0,0 +1,72 @@
+/*
+ * Copyright 2001-2018 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the OpenSSL license (the "License"). You may not use
+ * this file except in compliance with the License. You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+#include "eng_local.h"
+
+static ENGINE_TABLE *dh_table = NULL;
+static const int dummy_nid = 1;
+
+void ENGINE_unregister_DH(ENGINE *e)
+{
+ engine_table_unregister(&dh_table, e);
+}
+
+static void engine_unregister_all_DH(void)
+{
+ engine_table_cleanup(&dh_table);
+}
+
+int ENGINE_register_DH(ENGINE *e)
+{
+ if (e->dh_meth)
+ return engine_table_register(&dh_table,
+ engine_unregister_all_DH, e, &dummy_nid,
+ 1, 0);
+ return 1;
+}
+
+void ENGINE_register_all_DH(void)
+{
+ ENGINE *e;
+
+ for (e = ENGINE_get_first(); e; e = ENGINE_get_next(e))
+ ENGINE_register_DH(e);
+}
+
+int ENGINE_set_default_DH(ENGINE *e)
+{
+ if (e->dh_meth)
+ return engine_table_register(&dh_table,
+ engine_unregister_all_DH, e, &dummy_nid,
+ 1, 1);
+ return 1;
+}
+
+/*
+ * Exposed API function to get a functional reference from the implementation
+ * table (ie. try to get a functional reference from the tabled structural
+ * references).
+ */
+ENGINE *ENGINE_get_default_DH(void)
+{
+ return engine_table_select(&dh_table, dummy_nid);
+}
+
+/* Obtains an DH implementation from an ENGINE functional reference */
+const DH_METHOD *ENGINE_get_DH(const ENGINE *e)
+{
+ return e->dh_meth;
+}
+
+/* Sets an DH implementation in an ENGINE structure */
+int ENGINE_set_DH(ENGINE *e, const DH_METHOD *dh_meth)
+{
+ e->dh_meth = dh_meth;
+ return 1;
+}