mirror of
https://github.com/postgres/postgres.git
synced 2025-11-03 09:13:20 +03:00
5bb2300b59
in pghackers list. Support for oldstyle internal functions is gone (no longer needed, since conversion is complete) and pg_language entry 'internal' now implies newstyle call convention. pg_language entry 'newC' is gone; both old and newstyle dynamically loaded C functions are now called language 'C'. A newstyle function must be identified by an associated info routine. See src/backend/utils/fmgr/README.
160 lines
3.9 KiB
C
160 lines
3.9 KiB
C
/*
|
|
* pgcrypto.c
|
|
* Cryptographic digests for PostgreSQL.
|
|
*
|
|
* Copyright (c) 2000 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.
|
|
*
|
|
* $Id: pgcrypto.c,v 1.2 2000/11/20 20:36:56 tgl Exp $
|
|
*/
|
|
|
|
#include <postgres.h>
|
|
#include <utils/builtins.h>
|
|
|
|
#include "pgcrypto.h"
|
|
|
|
/*
|
|
* maximum length of digest for internal buffers
|
|
*/
|
|
#define MAX_DIGEST_LENGTH 128
|
|
|
|
/*
|
|
* NAMEDATALEN is used for hash names
|
|
*/
|
|
#if NAMEDATALEN < 16
|
|
#error "NAMEDATALEN < 16: too small"
|
|
#endif
|
|
|
|
|
|
/* exported functions */
|
|
Datum digest(PG_FUNCTION_ARGS);
|
|
Datum digest_exists(PG_FUNCTION_ARGS);
|
|
|
|
/* private stuff */
|
|
static char *
|
|
to_hex(uint8 *src, uint len, char *dst);
|
|
static pg_digest *
|
|
find_digest(pg_digest *hbuf, text *name, int silent);
|
|
|
|
|
|
/* SQL function: hash(text, text) returns text */
|
|
PG_FUNCTION_INFO_V1(digest);
|
|
|
|
Datum
|
|
digest(PG_FUNCTION_ARGS)
|
|
{
|
|
text *arg;
|
|
text *name;
|
|
uint8 *p, buf[MAX_DIGEST_LENGTH];
|
|
uint len, hlen;
|
|
pg_digest *h, _hbuf;
|
|
text *res;
|
|
|
|
if (PG_ARGISNULL(0) || PG_ARGISNULL(1))
|
|
PG_RETURN_NULL();
|
|
|
|
name = PG_GETARG_TEXT_P(1);
|
|
h = find_digest(&_hbuf, name, 0); /* will give error if fails */
|
|
|
|
hlen = h->length(h);
|
|
if (hlen > MAX_DIGEST_LENGTH)
|
|
elog(ERROR, "Hash length overflow: %d", hlen);
|
|
|
|
res = (text *)palloc(hlen*2 + VARHDRSZ);
|
|
VARATT_SIZEP(res) = hlen*2 + VARHDRSZ;
|
|
|
|
arg = PG_GETARG_TEXT_P(0);
|
|
len = VARSIZE(arg) - VARHDRSZ;
|
|
|
|
p = h->digest(h, VARDATA(arg), len, buf);
|
|
to_hex(p, hlen, VARDATA(res));
|
|
|
|
PG_FREE_IF_COPY(arg, 0);
|
|
PG_FREE_IF_COPY(name, 0); // unnecessary i guess
|
|
|
|
PG_RETURN_TEXT_P(res);
|
|
}
|
|
|
|
/* check if given hash exists */
|
|
PG_FUNCTION_INFO_V1(digest_exists);
|
|
|
|
Datum
|
|
digest_exists(PG_FUNCTION_ARGS)
|
|
{
|
|
text *name;
|
|
pg_digest _hbuf, *res;
|
|
|
|
if (PG_ARGISNULL(0))
|
|
PG_RETURN_NULL();
|
|
|
|
name = PG_GETARG_TEXT_P(0);
|
|
|
|
res = find_digest(&_hbuf, name, 1);
|
|
|
|
PG_FREE_IF_COPY(name, 0); // unnecessary i guess
|
|
|
|
if (res != NULL)
|
|
PG_RETURN_BOOL(true);
|
|
PG_RETURN_BOOL(false);
|
|
}
|
|
|
|
static pg_digest *
|
|
find_digest(pg_digest *hbuf, text *name, int silent)
|
|
{
|
|
pg_digest *p;
|
|
char buf[NAMEDATALEN];
|
|
uint len;
|
|
|
|
len = VARSIZE(name) - VARHDRSZ;
|
|
if (len >= NAMEDATALEN) {
|
|
if (silent)
|
|
return NULL;
|
|
elog(ERROR, "Hash type does not exist (name too long)");
|
|
}
|
|
|
|
memcpy(buf, VARDATA(name), len);
|
|
buf[len] = 0;
|
|
|
|
p = pg_find_digest(hbuf, buf);
|
|
|
|
if (p == NULL && !silent)
|
|
elog(ERROR, "Hash type does not exist: '%s'", buf);
|
|
return p;
|
|
}
|
|
|
|
static unsigned char *hextbl = "0123456789abcdef";
|
|
|
|
/* dumps binary to hex... Note that it does not null-terminate */
|
|
static char *
|
|
to_hex(uint8 *buf, uint len, char *dst)
|
|
{
|
|
uint i;
|
|
for (i = 0; i < len; i++) {
|
|
dst[i*2] = hextbl[(buf[i] >> 4) & 0xF];
|
|
dst[i*2 + 1] = hextbl[buf[i] & 0xF];
|
|
}
|
|
return dst;
|
|
}
|
|
|