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The C and C++ Include Header Files

cat -n /usr/include/openssl/rc4.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_RC4_H
    11	#define OPENSSL_RC4_H
    12	#pragma once
    13	
    14	#include <openssl/macros.h>
    15	#ifndef OPENSSL_NO_DEPRECATED_3_0
    16	#define HEADER_RC4_H
    17	#endif
    18	
    19	#include <openssl/opensslconf.h>
    20	
    21	#ifndef OPENSSL_NO_RC4
    22	#include <stddef.h>
    23	#ifdef __cplusplus
    24	extern "C" {
    25	#endif
    26	
    27	#ifndef OPENSSL_NO_DEPRECATED_3_0
    28	typedef struct rc4_key_st {
    29	    RC4_INT x, y;
    30	    RC4_INT data[256];
    31	} RC4_KEY;
    32	#endif
    33	#ifndef OPENSSL_NO_DEPRECATED_3_0
    34	OSSL_DEPRECATEDIN_3_0 const char *RC4_options(void);
    35	OSSL_DEPRECATEDIN_3_0 void RC4_set_key(RC4_KEY *key, int len,
    36	    const unsigned char *data);
    37	OSSL_DEPRECATEDIN_3_0 void RC4(RC4_KEY *key, size_t len,
    38	    const unsigned char *indata,
    39	    unsigned char *outdata);
    40	#endif
    41	
    42	#ifdef __cplusplus
    43	}
    44	#endif
    45	#endif
    46	
    47	#endif