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The C and C++ Include Header Files

cat -n /usr/include/openssl/mdc2.h

     1	/*
     2	 * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
     3	 *
     4	 * Licensed under the Apache License 2.0 (the "License").  You may not use
     5	 * this file except in compliance with the License.  You can obtain a copy
     6	 * in the file LICENSE in the source distribution or at
     7	 * https://www.openssl.org/source/license.html
     8	 */
     9	
    10	#ifndef OPENSSL_MDC2_H
    11	#define OPENSSL_MDC2_H
    12	#pragma once
    13	
    14	#include <openssl/macros.h>
    15	#ifndef OPENSSL_NO_DEPRECATED_3_0
    16	#define HEADER_MDC2_H
    17	#endif
    18	
    19	#include <openssl/opensslconf.h>
    20	
    21	#ifndef OPENSSL_NO_MDC2
    22	#include <stdlib.h>
    23	#include <openssl/des.h>
    24	#ifdef __cplusplus
    25	extern "C" {
    26	#endif
    27	
    28	#define MDC2_DIGEST_LENGTH 16
    29	
    30	#if !defined(OPENSSL_NO_DEPRECATED_3_0)
    31	
    32	#define MDC2_BLOCK 8
    33	
    34	typedef struct mdc2_ctx_st {
    35	    unsigned int num;
    36	    unsigned char data[MDC2_BLOCK];
    37	    DES_cblock h, hh;
    38	    unsigned int pad_type; /* either 1 or 2, default 1 */
    39	} MDC2_CTX;
    40	#endif
    41	#ifndef OPENSSL_NO_DEPRECATED_3_0
    42	OSSL_DEPRECATEDIN_3_0 int MDC2_Init(MDC2_CTX *c);
    43	OSSL_DEPRECATEDIN_3_0 int MDC2_Update(MDC2_CTX *c, const unsigned char *data,
    44	    size_t len);
    45	OSSL_DEPRECATEDIN_3_0 int MDC2_Final(unsigned char *md, MDC2_CTX *c);
    46	OSSL_DEPRECATEDIN_3_0 unsigned char *MDC2(const unsigned char *d, size_t n,
    47	    unsigned char *md);
    48	#endif
    49	
    50	#ifdef __cplusplus
    51	}
    52	#endif
    53	#endif
    54	
    55	#endif