/usr/include/openssl/rc4.h is in libssl-dev 1.1.0g-2ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#ifndef HEADER_RC4_H
# define HEADER_RC4_H
# include <openssl/opensslconf.h>
# ifndef OPENSSL_NO_RC4
# include <stddef.h>
#ifdef __cplusplus
extern "C" {
#endif
typedef struct rc4_key_st {
RC4_INT x, y;
RC4_INT data[256];
} RC4_KEY;
const char *RC4_options(void);
void RC4_set_key(RC4_KEY *key, int len, const unsigned char *data);
void RC4(RC4_KEY *key, size_t len, const unsigned char *indata,
unsigned char *outdata);
# ifdef __cplusplus
}
# endif
# endif
#endif
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