/usr/include/cyassl/ctaocrypt/md5.h is in libwolfssl-dev 3.13.0+dfsg-1.
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 41 42 43 44 | /* md5.h
 *
 * Copyright (C) 2006-2017 wolfSSL Inc.
 *
 * This file is part of wolfSSL.
 *
 * wolfSSL is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * wolfSSL 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
 */
#ifndef NO_MD5
#ifndef CTAO_CRYPT_MD5_H
#define CTAO_CRYPT_MD5_H
#include <wolfssl/wolfcrypt/md5.h>
#ifndef HAVE_FIPS
    #define InitMd5   wc_InitMd5
    #define Md5Update wc_Md5Update
    #define Md5Final  wc_Md5Final
    #define Md5Hash   wc_Md5Hash
#else
    /* redfined name so that hmac is calling same function names with fips */
    #define wc_InitMd5   InitMd5
    #define wc_Md5Update Md5Update
    #define wc_Md5Final  Md5Final
    #define wc_Md5Hash   Md5Hash
#endif
#endif /* CTAO_CRYPT_MD5_H */
#endif /* NO_MD5 */
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