postgresql/contrib/pgcrypto/mhash.c

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/*
* mhash.c
* Wrapper for mhash and mcrypt libraries.
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*
* 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
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* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
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* 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
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* 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.
*
* $Id: mhash.c,v 1.4 2001/08/21 00:42:41 momjian Exp $
*/
#include <postgres.h>
#include "px.h"
#include <mhash.h>
#include <mcrypt.h>
#define MAX_KEY_LENGTH 512
#define MAX_IV_LENGTH 128
#define DEF_KEY_LEN 16
/* DIGEST */
static uint
digest_result_size(PX_MD * h)
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{
MHASH mh = (MHASH) h->p.ptr;
hashid id = mhash_get_mhash_algo(mh);
return mhash_get_block_size(id);
}
static uint
digest_block_size(PX_MD * h)
{
MHASH mh = (MHASH) h->p.ptr;
hashid id = mhash_get_mhash_algo(mh);
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return mhash_get_hash_pblock(id);
}
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static void
digest_reset(PX_MD * h)
{
MHASH mh = (MHASH) h->p.ptr;
hashid id = mhash_get_mhash_algo(mh);
uint8 *res = mhash_end(mh);
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mhash_free(res);
mh = mhash_init(id);
h->p.ptr = mh;
}
static void
digest_update(PX_MD * h, const uint8 * data, uint dlen)
{
MHASH mh = (MHASH) h->p.ptr;
mhash(mh, data, dlen);
}
static void
digest_finish(PX_MD * h, uint8 * dst)
{
MHASH mh = (MHASH) h->p.ptr;
uint hlen = digest_result_size(h);
hashid id = mhash_get_mhash_algo(mh);
uint8 *buf = mhash_end(mh);
memcpy(dst, buf, hlen);
mhash_free(buf);
mh = mhash_init(id);
h->p.ptr = mh;
}
static void
digest_free(PX_MD * h)
{
MHASH mh = (MHASH) h->p.ptr;
uint8 *buf = mhash_end(mh);
mhash_free(buf);
px_free(h);
}
/* ENCRYPT / DECRYPT */
static uint
cipher_block_size(PX_Cipher *c)
{
MCRYPT ctx = (MCRYPT)c->ptr;
return mcrypt_enc_get_block_size(ctx);
}
static uint
cipher_key_size(PX_Cipher *c)
{
MCRYPT ctx = (MCRYPT)c->ptr;
return mcrypt_enc_get_key_size(ctx);
}
static uint
cipher_iv_size(PX_Cipher *c)
{
MCRYPT ctx = (MCRYPT)c->ptr;
return mcrypt_enc_mode_has_iv(ctx)
? mcrypt_enc_get_iv_size(ctx) : 0;
}
static int
cipher_init(PX_Cipher *c, const uint8 *key, uint klen, const uint8 *iv)
{
int err;
MCRYPT ctx = (MCRYPT)c->ptr;
err = mcrypt_generic_init(ctx, (char *)key, klen, (char*)iv);
if (err < 0)
elog(ERROR, "mcrypt_generic_init error: %s", mcrypt_strerror(err));
c->pstat = 1;
return 0;
}
static int
cipher_encrypt(PX_Cipher *c, const uint8 *data, uint dlen, uint8 *res)
{
int err;
MCRYPT ctx = (MCRYPT)c->ptr;
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memcpy(res, data, dlen);
err = mcrypt_generic(ctx, res, dlen);
if (err < 0)
elog(ERROR, "mcrypt_generic error: %s", mcrypt_strerror(err));
return 0;
}
static int
cipher_decrypt(PX_Cipher *c, const uint8 *data, uint dlen, uint8 *res)
{
int err;
MCRYPT ctx = (MCRYPT)c->ptr;
memcpy(res, data, dlen);
err = mdecrypt_generic(ctx, res, dlen);
if (err < 0)
elog(ERROR, "mdecrypt_generic error: %s", mcrypt_strerror(err));
return 0;
}
static void
cipher_free(PX_Cipher *c)
{
MCRYPT ctx = (MCRYPT)c->ptr;
if (c->pstat)
mcrypt_generic_end(ctx);
else
mcrypt_module_close(ctx);
px_free(c);
}
/* Helper functions */
static int
find_hashid(const char *name)
{
int res = -1;
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size_t hnum,
b,
i;
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char *mname;
hnum = mhash_count();
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for (i = 0; i <= hnum; i++)
{
mname = mhash_get_hash_name(i);
if (mname == NULL)
continue;
b = strcasecmp(name, mname);
free(mname);
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if (!b)
{
res = i;
break;
}
}
return res;
}
static char *modes[] = {
"ecb", "cbc", "cfb", "ofb", "nofb", "stream",
"ofb64", "cfb64", NULL
};
static PX_Alias aliases[] = {
{"bf", "blowfish" },
{"3des", "tripledes" },
{"des3", "tripledes" },
{"aes", "rijndael-128" },
{"rijndael", "rijndael-128" },
{"aes-128", "rijndael-128" },
{"aes-192", "rijndael-192" },
{"aes-256", "rijndael-256" },
{ NULL, NULL }
};
static PX_Alias mode_aliases[] = {
#if 0 /* N/A */
{ "cfb", "ncfb" },
{ "ofb", "nofb" },
{ "cfb64", "ncfb" },
#endif
/* { "ofb64", "nofb" }, not sure it works */
{ "cfb8", "cfb" },
{ "ofb8", "ofb" },
{ NULL, NULL }
};
static int is_mode(char *s)
{
char **p;
if (*s >= '0' && *s <= '9')
return 0;
for (p = modes; *p; p++)
if (!strcmp(s, *p))
return 1;
return 0;
}
/* PUBLIC FUNCTIONS */
int
px_find_digest(const char *name, PX_MD **res)
{
PX_MD *h;
MHASH mh;
int i;
i = find_hashid(name);
if (i < 0)
return -1;
mh = mhash_init(i);
h = px_alloc(sizeof(*h));
h->p.ptr = (void *) mh;
h->result_size = digest_result_size;
h->block_size = digest_block_size;
h->reset = digest_reset;
h->update = digest_update;
h->finish = digest_finish;
h->free = digest_free;
*res = h;
return 0;
}
int
px_find_cipher(const char *name, PX_Cipher **res)
{
char nbuf[PX_MAX_NAMELEN + 1];
const char *mode = NULL;
char *p;
MCRYPT ctx;
PX_Cipher *c;
strcpy(nbuf, name);
if ((p = strrchr(nbuf, '-')) != NULL) {
if (is_mode(p + 1)) {
mode = p + 1;
*p = 0;
}
}
name = px_resolve_alias(aliases, nbuf);
if (!mode) {
mode = "cbc";
/*
if (mcrypt_module_is_block_algorithm(name, NULL))
mode = "cbc";
else
mode = "stream";
*/
}
mode = px_resolve_alias(mode_aliases, mode);
ctx = mcrypt_module_open((char*)name, NULL, (char*)mode, NULL);
if (ctx == (void*)MCRYPT_FAILED)
return -1;
c = palloc(sizeof *c);
c->iv_size = cipher_iv_size;
c->key_size = cipher_key_size;
c->block_size = cipher_block_size;
c->init = cipher_init;
c->encrypt = cipher_encrypt;
c->decrypt = cipher_decrypt;
c->free = cipher_free;
c->ptr = ctx;
c->pstat = 0;
*res = c;
return 0;
}