/usr/include/mailutils/secret.h is in libmailutils-dev 1:2.99.99-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 | /* GNU Mailutils -- a suite of utilities for electronic mail
   Copyright (C) 2009-2012, 2014-2015 Free Software Foundation, Inc.
   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 3 of the License, or (at your option) any later version.
   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.
   You should have received a copy of the GNU Lesser General
   Public License along with this library.  If not, see 
   <http://www.gnu.org/licenses/>. */
#ifndef _MAILUTILS_SECRET_H
#define _MAILUTILS_SECRET_H
#include <mailutils/types.h>
#ifdef __cplusplus
extern "C" {
#endif
int mu_secret_create (mu_secret_t *psec, const char *value, size_t len);
int mu_secret_dup (mu_secret_t sec, mu_secret_t *newsec);
void mu_secret_destroy (mu_secret_t *psec);
const char *mu_secret_password (mu_secret_t sec);
void mu_secret_password_unref (mu_secret_t sec);
size_t mu_secret_length (mu_secret_t sec);
void mu_secret_ref (mu_secret_t sec);
int mu_secret_unref (mu_secret_t sec);
  
#ifdef __cplusplus
}
#endif
  
#endif
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