Add support for symbol hiding disabled by default.

Fully explained in libcrypto/README. TL;DR make sure libcrypto
and libssl's function calls internally and to each other are via
symbol names that won't get overridden by linking other libraries.

Mostly work by guenther@, which will currently be gated behind a
build setting NAMESPACE=yes. once we convert all the symbols to
this method we will do a major bump and pick up the changes.

ok tb@ jsing@

1 files changed, 36 insertions, 0 deletions

diff --git a/src/lib/libcrypto/hidden/openssl/hmac.h b/src/lib/libcrypto/hidden/openssl/hmac.h
new file mode 100644
index 0000000000..d8370945d0
--- /dev/null
+++ b/src/lib/libcrypto/hidden/openssl/hmac.h
@@ -0,0 +1,36 @@
+/*      $OpenBSD: hmac.h,v 1.1 2022/11/11 11:25:18 beck Exp $   */
+/*
+ * Copyright (c) 2016 Philip Guenther <guenther@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef _LIBCRYPTO_HMAC_H_
+#define _LIBCRYPTO_HMAC_H_
+
+#include_next <openssl/hmac.h>
+#include "crypto_namespace.h"
+
+LCRYPTO_USED(HMAC_CTX_new);
+LCRYPTO_USED(HMAC_CTX_free);
+LCRYPTO_UNUSED(HMAC_CTX_reset);
+LCRYPTO_UNUSED(HMAC_Init);
+LCRYPTO_USED(HMAC_Init_ex);
+LCRYPTO_USED(HMAC_Update);
+LCRYPTO_USED(HMAC_Final);
+LCRYPTO_USED(HMAC);
+LCRYPTO_USED(HMAC_CTX_copy);
+LCRYPTO_USED(HMAC_CTX_set_flags);
+LCRYPTO_USED(HMAC_CTX_get_md);
+
+#endif /* _LIBCRYPTO_HMAC_H_ */