//

// This program is free software; you can redistribute it and/or modify

// it under the terms of the GNU General Public License as published by

// the Free Software Foundation; either version 2 of the License, or

// (at your option) any later version.

//

// This program 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 General Public License for more details.

//

// You should have received a copy of the GNU General Public License

// along with this program; if not, write to the Free Software

// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

#include <config.h>

#include <unistd.h>

#include <stdlib.h>

#ifdef HAVE_CRYPT_H

#include <crypt.h>

#endif

#include "pwcrypt.h"

#ifndef HAVE_CRYPT

char *crypt(const char *key, const char *salt);

#endif

#ifndef HAVE_RANDOM

long int random(void);

#endif

extern "C"

{

#include "md5.h"

};

static const char bin2hex_table[17] = "0123456789abcdef";

#define OLD_MD5_CODE '3'

static const char* encrypt_old_md5(const mystring& pass)

{

  md5_ctx ctx;

  md5_init_ctx(&ctx);

  md5_process_bytes(pass.c_str(), pass.length(), &ctx);

  unsigned char md5[16];

  md5_finish_ctx(&ctx, md5);

  static char out[34];

  out[0] = OLD_MD5_CODE;

  for(unsigned i = 0; i < 16; i++) {

    out[i*2+1] = bin2hex_table[md5[i]>>4];

    out[i*2+2] = bin2hex_table[md5[i]&0xf];

  }

  out[33] = 0;

  return out;

}

extern "C" char *md5_crypt __P ((const char *key, const char *salt));

bool crypt_cmp(const mystring& pass, const mystring& stored)

{

  if(!stored || !pass)

    return false;

  const char* encrypted;

  if(stored.length() == 33 && stored[0] == OLD_MD5_CODE)

    encrypted = encrypt_old_md5(pass.c_str());

  else if(stored[0] == '$' && stored[1] == '1' && stored[2] == '$')

    encrypted = md5_crypt(pass.c_str(), stored.c_str());

  else

    encrypted = crypt(pass.c_str(), stored.c_str());

  return stored == encrypted;

}

const char* pwcrypt(const mystring& pass)

{

  char salt[14] = "$1$";

  for(unsigned i = 3; i < 11; i++)

    salt[i] = passwd_table[random() % 64];

  salt[12] = 0;

  return md5_crypt(pass.c_str(), salt);

}