/*
 * UFC-crypt: ultra fast crypt(3) implementation
 *
 * Copyright (C) 1991, 92, 93, 96, 97, 98, 2000 Free Software Foundation, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with the GNU C Library; see the file COPYING.LIB.  If not,
 * write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * @(#)crypt.h	1.5 12/20/96
 *
 */

#ifndef _CRYPT_H
#define _CRYPT_H	1

#include <features.h>

/* Encrypt characters from KEY using salt to perturb the encryption method.
 * If salt begins with "$1$", md5 hashing is used instead of DES. */
extern char *crypt (const char *__key, const char *__salt);

/* Setup DES tables according KEY.  */
extern void setkey (const char *__key);

/* Encrypt data in BLOCK in place if EDFLAG is zero; otherwise decrypt
   block in place.  */
extern void encrypt (char *__block, int __edflag);


/* Reentrant versions of the functions above.  The additional argument
   points to a structure where the results are placed in.  */
struct crypt_data
{
    /* The C and D arrays used to calculate the key schedule. */
    char C[28];
    char D[28];
    /* The key schedule. Generated from the key. */
    char KS[16][48];
    /* The E bit-selection table. */
    char E[48];
    /* The current block, divided into 2 halves. */
    char L[32], R[32];
    char tempL[32];
    char f[32];
    /* The combination of the key and the input, before selection. */
    char preS[48];
    char block[66];
    char iobuf[16];
    /* Some stuff used by the md5 routines */
    char *p;
    const char *sp,*ep;
};

extern char *crypt_r (const char *__key, const char *__salt,
		      struct crypt_data * __data);

extern void setkey_r (const char *__key,
		      struct crypt_data * __data);

extern void encrypt_r (char *__block, int __edflag,
		       struct crypt_data * __data);
#endif	/* crypt.h */