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px-crypt.c

/*
 * px-crypt.c
 *          Wrapper for various crypt algorithms.
 *
 * Copyright (c) 2001 Marko Kreen
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 THE AUTHOR 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.
 *
 * $PostgreSQL: pgsql/contrib/pgcrypto/px-crypt.c,v 1.15 2005/10/15 02:49:06 momjian Exp $
 */

#include "postgres.h"

#include "px.h"
#include "px-crypt.h"


static char *
run_crypt_des(const char *psw, const char *salt,
                    char *buf, unsigned len)
{
      char     *res;

      res = px_crypt_des(psw, salt);
      if (strlen(res) > len - 1)
            return NULL;
      strcpy(buf, res);
      return buf;
}

static char *
run_crypt_md5(const char *psw, const char *salt,
                    char *buf, unsigned len)
{
      char     *res;

      res = px_crypt_md5(psw, salt, buf, len);
      return res;
}

static char *
run_crypt_bf(const char *psw, const char *salt,
                   char *buf, unsigned len)
{
      char     *res;

      res = _crypt_blowfish_rn(psw, salt, buf, len);
      return res;
}

00071 struct px_crypt_algo
{
      char     *id;
      unsigned    id_len;
      char     *(*crypt) (const char *psw, const char *salt,
                                                        char *buf, unsigned len);
};

static const struct px_crypt_algo
                  px_crypt_list[] = {
      {"$2a$", 4, run_crypt_bf},
      {"$2$", 3, NULL},             /* N/A */
      {"$1$", 3, run_crypt_md5},
      {"_", 1, run_crypt_des},
      {"", 0, run_crypt_des},
      {NULL, 0, NULL}
};

char *
px_crypt(const char *psw, const char *salt, char *buf, unsigned len)
{
      const struct px_crypt_algo *c;

      for (c = px_crypt_list; c->id; c++)
      {
            if (!c->id_len)
                  break;
            if (!strncmp(salt, c->id, c->id_len))
                  break;
      }

      if (c->crypt == NULL)
            return NULL;

      return c->crypt(psw, salt, buf, len);
}

/*
 * salt generators
 */

00112 struct generator
{
      char     *name;
      char     *(*gen) (unsigned long count, const char *input, int size,
                                                      char *output, int output_size);
      int               input_len;
      int               def_rounds;
      int               min_rounds;
      int               max_rounds;
};

static struct generator gen_list[] = {
      {"des", _crypt_gensalt_traditional_rn, 2, 0, 0, 0},
      {"md5", _crypt_gensalt_md5_rn, 6, 0, 0, 0},
      {"xdes", _crypt_gensalt_extended_rn, 3, PX_XDES_ROUNDS, 1, 0xFFFFFF},
      {"bf", _crypt_gensalt_blowfish_rn, 16, PX_BF_ROUNDS, 4, 31},
      {NULL, NULL, 0, 0, 0, 0}
};

int
px_gen_salt(const char *salt_type, char *buf, int rounds)
{
      int               res;
      struct generator *g;
      char     *p;
      char        rbuf[16];

      for (g = gen_list; g->name; g++)
            if (pg_strcasecmp(g->name, salt_type) == 0)
                  break;

      if (g->name == NULL)
            return PXE_UNKNOWN_SALT_ALGO;

      if (g->def_rounds)
      {
            if (rounds == 0)
                  rounds = g->def_rounds;

            if (rounds < g->min_rounds || rounds > g->max_rounds)
                  return PXE_BAD_SALT_ROUNDS;
      }

      res = px_get_pseudo_random_bytes((uint8 *) rbuf, g->input_len);
      if (res < 0)
            return res;

      p = g->gen(rounds, rbuf, g->input_len, buf, PX_MAX_SALT_LEN);
      memset(rbuf, 0, sizeof(rbuf));

      if (p == NULL)
            return PXE_BAD_SALT_ROUNDS;

      return strlen(p);
}

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