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/*
* 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.
*
* contrib/pgcrypto/px-crypt.c
*/
#include "postgres.h"
#include "px-crypt.h"
#include "px.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 (res == NULL || 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;
}
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},
{"$2x$", 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) == 0)
break;
}
if (c->crypt == NULL)
return NULL;
return c->crypt(psw, salt, buf, len);
}
/*
* salt generators
*/
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)
{
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;
}
if (!pg_strong_random(rbuf, g->input_len))
return PXE_NO_RANDOM;
p = g->gen(rounds, rbuf, g->input_len, buf, PX_MAX_SALT_LEN);
px_memset(rbuf, 0, sizeof(rbuf));
if (p == NULL)
return PXE_BAD_SALT_ROUNDS;
return strlen(p);
}
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