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diff --git a/modules/pam_timestamp/hmac_openssl_wrapper.h b/modules/pam_timestamp/hmac_openssl_wrapper.h
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+++ b/modules/pam_timestamp/hmac_openssl_wrapper.h
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+/* Wrapper for hmac openssl implementation.
+ *
+ * Copyright (c) 2021 Red Hat, Inc.
+ * Written by Iker Pedrosa <ipedrosa@redhat.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, and the entire permission notice in its entirety,
+ *    including the disclaimer of warranties.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote
+ *    products derived from this software without specific prior
+ *    written permission.
+ *
+ * ALTERNATIVELY, this product may be distributed under the terms of
+ * the GNU Public License, in which case the provisions of the GPL are
+ * required INSTEAD OF the above restrictions.  (This clause is
+ * necessary due to a potential bad interaction between the GPL and
+ * the restrictions contained in a BSD-style copyright.)
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+#ifndef PAM_TIMESTAMP_HMAC_OPENSSL_WRAPPER_H
+#define PAM_TIMESTAMP_HMAC_OPENSSL_WRAPPER_H
+
+#include "config.h"
+
+#ifdef WITH_OPENSSL
+
+#include <openssl/hmac.h>
+#include <security/pam_modules.h>
+
+int
+hmac_size(pam_handle_t *pamh, int debug, size_t *hmac_length);
+
+int
+hmac_generate(pam_handle_t *pamh, int debug, void **mac, size_t *mac_length,
+              const char *key_file, uid_t owner, gid_t group,
+              const void *text, size_t text_length);
+
+#endif /* WITH_OPENSSL */
+#endif /* PAM_TIMESTAMP_HMAC_OPENSSL_WRAPPER_H */