postgres/contrib/pgcrypto/px.c
Tom Lane 0bd61548ab Solve the 'Turkish problem' with undesirable locale behavior for case
conversion of basic ASCII letters.  Remove all uses of strcasecmp and
strncasecmp in favor of new functions pg_strcasecmp and pg_strncasecmp;
remove most but not all direct uses of toupper and tolower in favor of
pg_toupper and pg_tolower.  These functions use the same notions of
case folding already developed for identifier case conversion.  I left
the straight locale-based folding in place for situations where we are
just manipulating user data and not trying to match it to built-in
strings --- for example, the SQL upper() function is still locale
dependent.  Perhaps this will prove not to be what's wanted, but at
the moment we can initdb and pass regression tests in Turkish locale.
2004-05-07 00:24:59 +00:00

337 lines
6.0 KiB
C

/*
* px.c
* Various cryptographic stuff for PostgreSQL.
*
* 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.c,v 1.9 2004/05/07 00:24:57 tgl Exp $
*/
#include <postgres.h>
#include "px.h"
const char *
px_resolve_alias(const PX_Alias * list, const char *name)
{
while (list->name)
{
if (pg_strcasecmp(list->alias, name) == 0)
return list->name;
list++;
}
return name;
}
/*
* combo - cipher + padding (+ checksum)
*/
static unsigned
combo_encrypt_len(PX_Combo * cx, unsigned dlen)
{
return dlen + 512;
}
static unsigned
combo_decrypt_len(PX_Combo * cx, unsigned dlen)
{
return dlen;
}
static int
combo_init(PX_Combo * cx, const uint8 *key, unsigned klen,
const uint8 *iv, unsigned ivlen)
{
int err;
unsigned bs,
ks,
ivs;
PX_Cipher *c = cx->cipher;
uint8 *ivbuf = NULL;
uint8 *keybuf;
bs = px_cipher_block_size(c);
ks = px_cipher_key_size(c);
ivs = px_cipher_iv_size(c);
if (ivs > 0)
{
ivbuf = px_alloc(ivs);
memset(ivbuf, 0, ivs);
if (ivlen > ivs)
memcpy(ivbuf, iv, ivs);
else
memcpy(ivbuf, iv, ivlen);
}
if (klen > ks)
klen = ks;
keybuf = px_alloc(ks);
memset(keybuf, 0, ks);
memcpy(keybuf, key, klen);
err = px_cipher_init(c, keybuf, klen, ivbuf);
if (ivbuf)
px_free(ivbuf);
px_free(keybuf);
return err;
}
static int
combo_encrypt(PX_Combo * cx, const uint8 *data, unsigned dlen,
uint8 *res, unsigned *rlen)
{
int err = 0;
uint8 *bbuf;
unsigned bs,
maxlen,
bpos,
i,
pad;
PX_Cipher *c = cx->cipher;
bbuf = NULL;
maxlen = *rlen;
bs = px_cipher_block_size(c);
/* encrypt */
if (bs > 1)
{
bbuf = px_alloc(bs * 4);
bpos = dlen % bs;
*rlen = dlen - bpos;
memcpy(bbuf, data + *rlen, bpos);
/* encrypt full-block data */
if (*rlen)
{
err = px_cipher_encrypt(c, data, *rlen, res);
if (err)
goto out;
}
/* bbuf has now bpos bytes of stuff */
if (cx->padding)
{
pad = bs - (bpos % bs);
for (i = 0; i < pad; i++)
bbuf[bpos++] = pad;
}
else if (bpos % bs)
{
/* ERROR? */
pad = bs - (bpos % bs);
for (i = 0; i < pad; i++)
bbuf[bpos++] = 0;
}
/* encrypt the rest - pad */
if (bpos)
{
err = px_cipher_encrypt(c, bbuf, bpos, res + *rlen);
*rlen += bpos;
}
}
else
{
/* stream cipher/mode - no pad needed */
err = px_cipher_encrypt(c, data, dlen, res);
if (err)
goto out;
*rlen = dlen;
}
out:
if (bbuf)
px_free(bbuf);
return err;
}
static int
combo_decrypt(PX_Combo * cx, const uint8 *data, unsigned dlen,
uint8 *res, unsigned *rlen)
{
unsigned bs,
i,
pad;
unsigned pad_ok;
PX_Cipher *c = cx->cipher;
bs = px_cipher_block_size(c);
if (bs > 1 && (dlen % bs) != 0)
goto block_error;
/* decrypt */
*rlen = dlen;
px_cipher_decrypt(c, data, dlen, res);
/* unpad */
if (bs > 1 && cx->padding)
{
pad = res[*rlen - 1];
pad_ok = 0;
if (pad > 0 && pad <= bs && pad <= *rlen)
{
pad_ok = 1;
for (i = *rlen - pad; i < *rlen; i++)
if (res[i] != pad)
{
pad_ok = 0;
break;
}
}
if (pad_ok)
*rlen -= pad;
}
return 0;
/* error reporting should be done in pgcrypto.c */
block_error:
elog(WARNING, "Data not a multiple of block size");
return -1;
}
static void
combo_free(PX_Combo * cx)
{
if (cx->cipher)
px_cipher_free(cx->cipher);
memset(cx, 0, sizeof(*cx));
px_free(cx);
}
/* PARSER */
static int
parse_cipher_name(char *full, char **cipher, char **pad)
{
char *p,
*p2,
*q;
*cipher = full;
*pad = NULL;
p = strchr(full, '/');
if (p != NULL)
*p++ = 0;
while (p != NULL)
{
if ((q = strchr(p, '/')) != NULL)
*q++ = 0;
if (!*p)
{
p = q;
continue;
}
p2 = strchr(p, ':');
if (p2 != NULL)
{
*p2++ = 0;
if (!strcmp(p, "pad"))
*pad = p2;
else
return -1;
}
else
return -1;
p = q;
}
return 0;
}
/* provider */
int
px_find_combo(const char *name, PX_Combo ** res)
{
int err;
char *buf,
*s_cipher,
*s_pad;
PX_Combo *cx;
cx = px_alloc(sizeof(*cx));
memset(cx, 0, sizeof(*cx));
buf = px_alloc(strlen(name) + 1);
strcpy(buf, name);
err = parse_cipher_name(buf, &s_cipher, &s_pad);
if (err)
{
px_free(buf);
px_free(cx);
return err;
}
err = px_find_cipher(s_cipher, &cx->cipher);
if (err)
goto err1;
if (s_pad != NULL)
{
if (!strcmp(s_pad, "pkcs"))
cx->padding = 1;
else if (!strcmp(s_pad, "none"))
cx->padding = 0;
else
goto err1;
}
else
cx->padding = 1;
cx->init = combo_init;
cx->encrypt = combo_encrypt;
cx->decrypt = combo_decrypt;
cx->encrypt_len = combo_encrypt_len;
cx->decrypt_len = combo_decrypt_len;
cx->free = combo_free;
px_free(buf);
*res = cx;
return 0;
err1:
if (cx->cipher)
px_cipher_free(cx->cipher);
px_free(cx);
px_free(buf);
return -1;
}