/usr/include/crypt.h is in libc6-dev 2.24-11+deb9u4.
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 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 | /*
* UFC-crypt: ultra fast crypt(3) implementation
*
* Copyright (C) 1991-2016 Free Software Foundation, Inc.
*
* The GNU C 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 2.1 of the License, or (at your option) any later version.
*
* The GNU C 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 the GNU C Library; if not, see
* <http://www.gnu.org/licenses/>.
*
* @(#)crypt.h 1.5 12/20/96
*
*/
#ifndef _CRYPT_H
#define _CRYPT_H 1
#include <features.h>
__BEGIN_DECLS
/* Encrypt at most 8 characters from KEY using salt to perturb DES. */
extern char *crypt (const char *__key, const char *__salt)
__THROW __nonnull ((1, 2));
/* Setup DES tables according KEY. */
extern void setkey (const char *__key) __THROW __nonnull ((1));
/* Encrypt data in BLOCK in place if EDFLAG is zero; otherwise decrypt
block in place. */
extern void encrypt (char *__glibc_block, int __edflag)
__THROW __nonnull ((1));
#ifdef __USE_GNU
/* Reentrant versions of the functions above. The additional argument
points to a structure where the results are placed in. */
struct crypt_data
{
char keysched[16 * 8];
char sb0[32768];
char sb1[32768];
char sb2[32768];
char sb3[32768];
/* end-of-aligment-critical-data */
char crypt_3_buf[14];
char current_salt[2];
long int current_saltbits;
int direction, initialized;
};
extern char *crypt_r (const char *__key, const char *__salt,
struct crypt_data * __restrict __data)
__THROW __nonnull ((1, 2, 3));
extern void setkey_r (const char *__key,
struct crypt_data * __restrict __data)
__THROW __nonnull ((1, 2));
extern void encrypt_r (char *__glibc_block, int __edflag,
struct crypt_data * __restrict __data)
__THROW __nonnull ((1, 3));
#endif
__END_DECLS
#endif /* crypt.h */
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