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encrypt.c

/*
 * Copyright 1990 - 1993, Julianne Frances Haugh
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of Julianne F. Haugh nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <config.h>

#include "rcsid.h"
RCSID("$Id: encrypt.c 6 2005-03-20 15:34:28Z bubulle $")

#include "prototypes.h"
#include "defines.h"

extern      char  *crypt();
extern char *libshadow_md5_crypt(const char *, const char *);

char *
pw_encrypt(const char *clear, const char *salt)
{
      static      char  cipher[128];
      char  *cp;
#ifdef SW_CRYPT
      static      int   count;
#endif

#ifdef MD5_CRYPT
      /*
       * If the salt string from the password file or from crypt_make_salt()
       * begins with the magic string, use the new algorithm.
       */
      if (strncmp(salt, "$1$", 3) == 0)
            return libshadow_md5_crypt(clear, salt);
#endif

#ifdef      SW_CRYPT
      /*
       * Copy over the salt.  It is always the first two
       * characters of the string.
       */

      cipher[0] = salt[0];
      cipher[1] = salt[1];
      cipher[2] = '\0';

      /*
       * Loop up to ten times on the cleartext password.
       * This is because the input limit for passwords is
       * 80 characters.
       *
       * The initial salt is that provided by the user, or the
       * one generated above.  The subsequent salts are gotten
       * from the first two characters of the previous encrypted
       * block of characters.
       */

      for (count = 0;count < 10;count++) {
            cp = crypt(clear, salt);
            if (!cp) {
                  perror("crypt");
                  exit(1);
            }
            if (strlen(cp) != 13)
                  return cp;
            strcat(cipher, cp + 2);
            salt = cipher + 11 * count + 2;

            if (strlen(clear) > 8)
                  clear += 8;
            else
                  break;
      }
#else
      cp = crypt(clear, salt);
      if (!cp) {
            /*
             * Single Unix Spec: crypt() may return a null pointer,
             * and set errno to indicate an error.  The caller doesn't
             * expect us to return NULL, so...
             */
            perror("crypt");
            exit(1);
      }
      if (strlen(cp) != 13)
            return cp;  /* nonstandard crypt() in libc, better bail out */
      strcpy(cipher, cp);

#ifdef      DOUBLESIZE
      if (strlen (clear) > 8) {
            cp = crypt(clear + 8, salt);
            if (!cp) {
                  perror("crypt");
                  exit(1);
            }
            strcat(cipher, cp + 2);
      }
#endif      /* DOUBLESIZE */
#endif      /* SW_CRYPT */
      return cipher;
}

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