mirror of
https://git.postgresql.org/git/postgresql.git
synced 2024-07-20 06:29:37 +02:00
1abf76e82c
Few cleanups and couple of new things: - add SHA2 algorithm to older OpenSSL - add BIGNUM math to have public-key cryptography work on non-OpenSSL build. - gen_random_bytes() function The status of SHA2 algoritms and public-key encryption can now be changed to 'always available.' That makes pgcrypto functionally complete and unless there will be new editions of AES, SHA2 or OpenPGP standards, there is no major changes planned.
613 lines
13 KiB
C
613 lines
13 KiB
C
/*
|
|
* pgcrypto.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/pgcrypto.c,v 1.22 2006/07/13 04:15:25 neilc Exp $
|
|
*/
|
|
|
|
#include "postgres.h"
|
|
|
|
#include <ctype.h>
|
|
|
|
#include "fmgr.h"
|
|
#include "parser/scansup.h"
|
|
|
|
#include "px.h"
|
|
#include "px-crypt.h"
|
|
#include "pgcrypto.h"
|
|
|
|
PG_MODULE_MAGIC;
|
|
|
|
/* private stuff */
|
|
|
|
typedef int (*PFN) (const char *name, void **res);
|
|
static void *
|
|
find_provider(text *name, PFN pf, char *desc, int silent);
|
|
|
|
/* SQL function: hash(bytea, text) returns bytea */
|
|
PG_FUNCTION_INFO_V1(pg_digest);
|
|
|
|
Datum
|
|
pg_digest(PG_FUNCTION_ARGS)
|
|
{
|
|
bytea *arg;
|
|
text *name;
|
|
unsigned len,
|
|
hlen;
|
|
PX_MD *md;
|
|
bytea *res;
|
|
|
|
if (PG_ARGISNULL(0) || PG_ARGISNULL(1))
|
|
PG_RETURN_NULL();
|
|
|
|
name = PG_GETARG_TEXT_P(1);
|
|
|
|
/* will give error if fails */
|
|
md = find_provider(name, (PFN) px_find_digest, "Digest", 0);
|
|
|
|
hlen = px_md_result_size(md);
|
|
|
|
res = (text *) palloc(hlen + VARHDRSZ);
|
|
VARATT_SIZEP(res) = hlen + VARHDRSZ;
|
|
|
|
arg = PG_GETARG_BYTEA_P(0);
|
|
len = VARSIZE(arg) - VARHDRSZ;
|
|
|
|
px_md_update(md, (uint8 *) VARDATA(arg), len);
|
|
px_md_finish(md, (uint8 *) VARDATA(res));
|
|
px_md_free(md);
|
|
|
|
PG_FREE_IF_COPY(arg, 0);
|
|
PG_FREE_IF_COPY(name, 1);
|
|
|
|
PG_RETURN_BYTEA_P(res);
|
|
}
|
|
|
|
/* check if given hash exists */
|
|
PG_FUNCTION_INFO_V1(pg_digest_exists);
|
|
|
|
Datum
|
|
pg_digest_exists(PG_FUNCTION_ARGS)
|
|
{
|
|
text *name;
|
|
PX_MD *res;
|
|
|
|
if (PG_ARGISNULL(0))
|
|
PG_RETURN_NULL();
|
|
|
|
name = PG_GETARG_TEXT_P(0);
|
|
|
|
res = find_provider(name, (PFN) px_find_digest, "Digest", 1);
|
|
|
|
PG_FREE_IF_COPY(name, 0);
|
|
|
|
if (res == NULL)
|
|
PG_RETURN_BOOL(false);
|
|
|
|
res->free(res);
|
|
|
|
PG_RETURN_BOOL(true);
|
|
}
|
|
|
|
/* SQL function: hmac(data:bytea, key:bytea, type:text) returns bytea */
|
|
PG_FUNCTION_INFO_V1(pg_hmac);
|
|
|
|
Datum
|
|
pg_hmac(PG_FUNCTION_ARGS)
|
|
{
|
|
bytea *arg;
|
|
bytea *key;
|
|
text *name;
|
|
unsigned len,
|
|
hlen,
|
|
klen;
|
|
PX_HMAC *h;
|
|
bytea *res;
|
|
|
|
if (PG_ARGISNULL(0) || PG_ARGISNULL(1) || PG_ARGISNULL(2))
|
|
PG_RETURN_NULL();
|
|
|
|
name = PG_GETARG_TEXT_P(2);
|
|
|
|
/* will give error if fails */
|
|
h = find_provider(name, (PFN) px_find_hmac, "HMAC", 0);
|
|
|
|
hlen = px_hmac_result_size(h);
|
|
|
|
res = (text *) palloc(hlen + VARHDRSZ);
|
|
VARATT_SIZEP(res) = hlen + VARHDRSZ;
|
|
|
|
arg = PG_GETARG_BYTEA_P(0);
|
|
key = PG_GETARG_BYTEA_P(1);
|
|
len = VARSIZE(arg) - VARHDRSZ;
|
|
klen = VARSIZE(key) - VARHDRSZ;
|
|
|
|
px_hmac_init(h, (uint8 *) VARDATA(key), klen);
|
|
px_hmac_update(h, (uint8 *) VARDATA(arg), len);
|
|
px_hmac_finish(h, (uint8 *) VARDATA(res));
|
|
px_hmac_free(h);
|
|
|
|
PG_FREE_IF_COPY(arg, 0);
|
|
PG_FREE_IF_COPY(key, 1);
|
|
PG_FREE_IF_COPY(name, 2);
|
|
|
|
PG_RETURN_BYTEA_P(res);
|
|
}
|
|
|
|
/* check if given hmac type exists */
|
|
PG_FUNCTION_INFO_V1(pg_hmac_exists);
|
|
|
|
Datum
|
|
pg_hmac_exists(PG_FUNCTION_ARGS)
|
|
{
|
|
text *name;
|
|
PX_HMAC *h;
|
|
|
|
if (PG_ARGISNULL(0))
|
|
PG_RETURN_NULL();
|
|
|
|
name = PG_GETARG_TEXT_P(0);
|
|
|
|
h = find_provider(name, (PFN) px_find_hmac, "HMAC", 1);
|
|
|
|
PG_FREE_IF_COPY(name, 0);
|
|
|
|
if (h != NULL)
|
|
{
|
|
px_hmac_free(h);
|
|
PG_RETURN_BOOL(true);
|
|
}
|
|
PG_RETURN_BOOL(false);
|
|
}
|
|
|
|
|
|
/* SQL function: pg_gen_salt(text) returns text */
|
|
PG_FUNCTION_INFO_V1(pg_gen_salt);
|
|
|
|
Datum
|
|
pg_gen_salt(PG_FUNCTION_ARGS)
|
|
{
|
|
text *arg0;
|
|
int len;
|
|
text *res;
|
|
char buf[PX_MAX_SALT_LEN + 1];
|
|
|
|
if (PG_ARGISNULL(0))
|
|
PG_RETURN_NULL();
|
|
|
|
arg0 = PG_GETARG_TEXT_P(0);
|
|
|
|
len = VARSIZE(arg0) - VARHDRSZ;
|
|
len = len > PX_MAX_SALT_LEN ? PX_MAX_SALT_LEN : len;
|
|
memcpy(buf, VARDATA(arg0), len);
|
|
buf[len] = 0;
|
|
len = px_gen_salt(buf, buf, 0);
|
|
if (len < 0)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
|
|
errmsg("gen_salt: %s", px_strerror(len))));
|
|
|
|
res = (text *) palloc(len + VARHDRSZ);
|
|
VARATT_SIZEP(res) = len + VARHDRSZ;
|
|
memcpy(VARDATA(res), buf, len);
|
|
|
|
PG_FREE_IF_COPY(arg0, 0);
|
|
|
|
PG_RETURN_TEXT_P(res);
|
|
}
|
|
|
|
/* SQL function: pg_gen_salt(text, int4) returns text */
|
|
PG_FUNCTION_INFO_V1(pg_gen_salt_rounds);
|
|
|
|
Datum
|
|
pg_gen_salt_rounds(PG_FUNCTION_ARGS)
|
|
{
|
|
text *arg0;
|
|
int rounds;
|
|
int len;
|
|
text *res;
|
|
char buf[PX_MAX_SALT_LEN + 1];
|
|
|
|
if (PG_ARGISNULL(0) || PG_ARGISNULL(1))
|
|
PG_RETURN_NULL();
|
|
|
|
arg0 = PG_GETARG_TEXT_P(0);
|
|
rounds = PG_GETARG_INT32(1);
|
|
|
|
len = VARSIZE(arg0) - VARHDRSZ;
|
|
len = len > PX_MAX_SALT_LEN ? PX_MAX_SALT_LEN : len;
|
|
memcpy(buf, VARDATA(arg0), len);
|
|
buf[len] = 0;
|
|
len = px_gen_salt(buf, buf, rounds);
|
|
if (len < 0)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
|
|
errmsg("gen_salt: %s", px_strerror(len))));
|
|
|
|
res = (text *) palloc(len + VARHDRSZ);
|
|
VARATT_SIZEP(res) = len + VARHDRSZ;
|
|
memcpy(VARDATA(res), buf, len);
|
|
|
|
PG_FREE_IF_COPY(arg0, 0);
|
|
|
|
PG_RETURN_TEXT_P(res);
|
|
}
|
|
|
|
/* SQL function: pg_crypt(psw:text, salt:text) returns text */
|
|
PG_FUNCTION_INFO_V1(pg_crypt);
|
|
|
|
Datum
|
|
pg_crypt(PG_FUNCTION_ARGS)
|
|
{
|
|
text *arg0;
|
|
text *arg1;
|
|
unsigned len0,
|
|
len1,
|
|
clen;
|
|
char *buf0,
|
|
*buf1,
|
|
*cres,
|
|
*resbuf;
|
|
text *res;
|
|
|
|
if (PG_ARGISNULL(0) || PG_ARGISNULL(1))
|
|
PG_RETURN_NULL();
|
|
|
|
arg0 = PG_GETARG_TEXT_P(0);
|
|
arg1 = PG_GETARG_TEXT_P(1);
|
|
len0 = VARSIZE(arg0) - VARHDRSZ;
|
|
len1 = VARSIZE(arg1) - VARHDRSZ;
|
|
|
|
buf0 = palloc(len0 + 1);
|
|
buf1 = palloc(len1 + 1);
|
|
|
|
memcpy(buf0, VARDATA(arg0), len0);
|
|
memcpy(buf1, VARDATA(arg1), len1);
|
|
|
|
buf0[len0] = '\0';
|
|
buf1[len1] = '\0';
|
|
|
|
resbuf = palloc(PX_MAX_CRYPT);
|
|
|
|
memset(resbuf, 0, PX_MAX_CRYPT);
|
|
|
|
cres = px_crypt(buf0, buf1, resbuf, PX_MAX_CRYPT);
|
|
|
|
pfree(buf0);
|
|
pfree(buf1);
|
|
|
|
if (cres == NULL)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_EXTERNAL_ROUTINE_INVOCATION_EXCEPTION),
|
|
errmsg("crypt(3) returned NULL")));
|
|
|
|
clen = strlen(cres);
|
|
|
|
res = (text *) palloc(clen + VARHDRSZ);
|
|
VARATT_SIZEP(res) = clen + VARHDRSZ;
|
|
memcpy(VARDATA(res), cres, clen);
|
|
pfree(resbuf);
|
|
|
|
PG_FREE_IF_COPY(arg0, 0);
|
|
PG_FREE_IF_COPY(arg1, 1);
|
|
|
|
PG_RETURN_TEXT_P(res);
|
|
}
|
|
|
|
/* SQL function: pg_encrypt(bytea, bytea, text) returns bytea */
|
|
PG_FUNCTION_INFO_V1(pg_encrypt);
|
|
|
|
Datum
|
|
pg_encrypt(PG_FUNCTION_ARGS)
|
|
{
|
|
int err;
|
|
bytea *data,
|
|
*key,
|
|
*res;
|
|
text *type;
|
|
PX_Combo *c;
|
|
unsigned dlen,
|
|
klen,
|
|
rlen;
|
|
|
|
if (PG_ARGISNULL(0) || PG_ARGISNULL(1) || PG_ARGISNULL(2))
|
|
PG_RETURN_NULL();
|
|
|
|
type = PG_GETARG_TEXT_P(2);
|
|
c = find_provider(type, (PFN) px_find_combo, "Cipher", 0);
|
|
|
|
data = PG_GETARG_BYTEA_P(0);
|
|
key = PG_GETARG_BYTEA_P(1);
|
|
dlen = VARSIZE(data) - VARHDRSZ;
|
|
klen = VARSIZE(key) - VARHDRSZ;
|
|
|
|
rlen = px_combo_encrypt_len(c, dlen);
|
|
res = palloc(VARHDRSZ + rlen);
|
|
|
|
err = px_combo_init(c, (uint8 *) VARDATA(key), klen, NULL, 0);
|
|
if (!err)
|
|
err = px_combo_encrypt(c, (uint8 *) VARDATA(data), dlen,
|
|
(uint8 *) VARDATA(res), &rlen);
|
|
px_combo_free(c);
|
|
|
|
PG_FREE_IF_COPY(data, 0);
|
|
PG_FREE_IF_COPY(key, 1);
|
|
PG_FREE_IF_COPY(type, 2);
|
|
|
|
if (err)
|
|
{
|
|
pfree(res);
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_EXTERNAL_ROUTINE_INVOCATION_EXCEPTION),
|
|
errmsg("encrypt error: %s", px_strerror(err))));
|
|
}
|
|
|
|
VARATT_SIZEP(res) = VARHDRSZ + rlen;
|
|
PG_RETURN_BYTEA_P(res);
|
|
}
|
|
|
|
/* SQL function: pg_decrypt(bytea, bytea, text) returns bytea */
|
|
PG_FUNCTION_INFO_V1(pg_decrypt);
|
|
|
|
Datum
|
|
pg_decrypt(PG_FUNCTION_ARGS)
|
|
{
|
|
int err;
|
|
bytea *data,
|
|
*key,
|
|
*res;
|
|
text *type;
|
|
PX_Combo *c;
|
|
unsigned dlen,
|
|
klen,
|
|
rlen;
|
|
|
|
if (PG_ARGISNULL(0) || PG_ARGISNULL(1) || PG_ARGISNULL(2))
|
|
PG_RETURN_NULL();
|
|
|
|
type = PG_GETARG_TEXT_P(2);
|
|
c = find_provider(type, (PFN) px_find_combo, "Cipher", 0);
|
|
|
|
data = PG_GETARG_BYTEA_P(0);
|
|
key = PG_GETARG_BYTEA_P(1);
|
|
dlen = VARSIZE(data) - VARHDRSZ;
|
|
klen = VARSIZE(key) - VARHDRSZ;
|
|
|
|
rlen = px_combo_decrypt_len(c, dlen);
|
|
res = palloc(VARHDRSZ + rlen);
|
|
|
|
err = px_combo_init(c, (uint8 *) VARDATA(key), klen, NULL, 0);
|
|
if (!err)
|
|
err = px_combo_decrypt(c, (uint8 *) VARDATA(data), dlen,
|
|
(uint8 *) VARDATA(res), &rlen);
|
|
|
|
px_combo_free(c);
|
|
|
|
if (err)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_EXTERNAL_ROUTINE_INVOCATION_EXCEPTION),
|
|
errmsg("decrypt error: %s", px_strerror(err))));
|
|
|
|
VARATT_SIZEP(res) = VARHDRSZ + rlen;
|
|
|
|
PG_FREE_IF_COPY(data, 0);
|
|
PG_FREE_IF_COPY(key, 1);
|
|
PG_FREE_IF_COPY(type, 2);
|
|
|
|
PG_RETURN_BYTEA_P(res);
|
|
}
|
|
|
|
/* SQL function: pg_encrypt_iv(bytea, bytea, bytea, text) returns bytea */
|
|
PG_FUNCTION_INFO_V1(pg_encrypt_iv);
|
|
|
|
Datum
|
|
pg_encrypt_iv(PG_FUNCTION_ARGS)
|
|
{
|
|
int err;
|
|
bytea *data,
|
|
*key,
|
|
*iv,
|
|
*res;
|
|
text *type;
|
|
PX_Combo *c;
|
|
unsigned dlen,
|
|
klen,
|
|
ivlen,
|
|
rlen;
|
|
|
|
if (PG_ARGISNULL(0) || PG_ARGISNULL(1)
|
|
|| PG_ARGISNULL(2) || PG_ARGISNULL(3))
|
|
PG_RETURN_NULL();
|
|
|
|
type = PG_GETARG_TEXT_P(3);
|
|
c = find_provider(type, (PFN) px_find_combo, "Cipher", 0);
|
|
|
|
data = PG_GETARG_BYTEA_P(0);
|
|
key = PG_GETARG_BYTEA_P(1);
|
|
iv = PG_GETARG_BYTEA_P(2);
|
|
dlen = VARSIZE(data) - VARHDRSZ;
|
|
klen = VARSIZE(key) - VARHDRSZ;
|
|
ivlen = VARSIZE(iv) - VARHDRSZ;
|
|
|
|
rlen = px_combo_encrypt_len(c, dlen);
|
|
res = palloc(VARHDRSZ + rlen);
|
|
|
|
err = px_combo_init(c, (uint8 *) VARDATA(key), klen,
|
|
(uint8 *) VARDATA(iv), ivlen);
|
|
if (!err)
|
|
px_combo_encrypt(c, (uint8 *) VARDATA(data), dlen,
|
|
(uint8 *) VARDATA(res), &rlen);
|
|
|
|
px_combo_free(c);
|
|
|
|
if (err)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_EXTERNAL_ROUTINE_INVOCATION_EXCEPTION),
|
|
errmsg("encrypt_iv error: %s", px_strerror(err))));
|
|
|
|
VARATT_SIZEP(res) = VARHDRSZ + rlen;
|
|
|
|
PG_FREE_IF_COPY(data, 0);
|
|
PG_FREE_IF_COPY(key, 1);
|
|
PG_FREE_IF_COPY(iv, 2);
|
|
PG_FREE_IF_COPY(type, 3);
|
|
|
|
PG_RETURN_BYTEA_P(res);
|
|
}
|
|
|
|
/* SQL function: pg_decrypt_iv(bytea, bytea, bytea, text) returns bytea */
|
|
PG_FUNCTION_INFO_V1(pg_decrypt_iv);
|
|
|
|
Datum
|
|
pg_decrypt_iv(PG_FUNCTION_ARGS)
|
|
{
|
|
int err;
|
|
bytea *data,
|
|
*key,
|
|
*iv,
|
|
*res;
|
|
text *type;
|
|
PX_Combo *c;
|
|
unsigned dlen,
|
|
klen,
|
|
rlen,
|
|
ivlen;
|
|
|
|
if (PG_ARGISNULL(0) || PG_ARGISNULL(1)
|
|
|| PG_ARGISNULL(2) || PG_ARGISNULL(3))
|
|
PG_RETURN_NULL();
|
|
|
|
type = PG_GETARG_TEXT_P(3);
|
|
c = find_provider(type, (PFN) px_find_combo, "Cipher", 0);
|
|
|
|
data = PG_GETARG_BYTEA_P(0);
|
|
key = PG_GETARG_BYTEA_P(1);
|
|
iv = PG_GETARG_BYTEA_P(2);
|
|
dlen = VARSIZE(data) - VARHDRSZ;
|
|
klen = VARSIZE(key) - VARHDRSZ;
|
|
ivlen = VARSIZE(iv) - VARHDRSZ;
|
|
|
|
rlen = px_combo_decrypt_len(c, dlen);
|
|
res = palloc(VARHDRSZ + rlen);
|
|
|
|
err = px_combo_init(c, (uint8 *) VARDATA(key), klen,
|
|
(uint8 *) VARDATA(iv), ivlen);
|
|
if (!err)
|
|
px_combo_decrypt(c, (uint8 *) VARDATA(data), dlen,
|
|
(uint8 *) VARDATA(res), &rlen);
|
|
|
|
px_combo_free(c);
|
|
|
|
if (err)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_EXTERNAL_ROUTINE_INVOCATION_EXCEPTION),
|
|
errmsg("decrypt_iv error: %s", px_strerror(err))));
|
|
|
|
VARATT_SIZEP(res) = VARHDRSZ + rlen;
|
|
|
|
PG_FREE_IF_COPY(data, 0);
|
|
PG_FREE_IF_COPY(key, 1);
|
|
PG_FREE_IF_COPY(iv, 2);
|
|
PG_FREE_IF_COPY(type, 3);
|
|
|
|
PG_RETURN_BYTEA_P(res);
|
|
}
|
|
|
|
/* SQL function: pg_random_bytes(int4) returns bytea */
|
|
PG_FUNCTION_INFO_V1(pg_random_bytes);
|
|
|
|
Datum
|
|
pg_random_bytes(PG_FUNCTION_ARGS)
|
|
{
|
|
int err;
|
|
int len = PG_GETARG_INT32(0);
|
|
bytea *res;
|
|
|
|
if (len < 1 || len > 1024)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_EXTERNAL_ROUTINE_INVOCATION_EXCEPTION),
|
|
errmsg("Length not in range")));
|
|
|
|
res = palloc(VARHDRSZ + len);
|
|
VARATT_SIZEP(res) = VARHDRSZ + len;
|
|
|
|
/* generate result */
|
|
err = px_get_random_bytes((uint8*)VARDATA(res), len);
|
|
if (err < 0)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_EXTERNAL_ROUTINE_INVOCATION_EXCEPTION),
|
|
errmsg("Random generator error: %s", px_strerror(err))));
|
|
|
|
PG_RETURN_BYTEA_P(res);
|
|
}
|
|
|
|
/* SQL function: pg_cipher_exists(text) returns bool */
|
|
PG_FUNCTION_INFO_V1(pg_cipher_exists);
|
|
|
|
Datum
|
|
pg_cipher_exists(PG_FUNCTION_ARGS)
|
|
{
|
|
text *arg;
|
|
PX_Combo *c;
|
|
|
|
if (PG_ARGISNULL(0))
|
|
PG_RETURN_NULL();
|
|
|
|
arg = PG_GETARG_TEXT_P(0);
|
|
|
|
c = find_provider(arg, (PFN) px_find_combo, "Cipher", 1);
|
|
if (c != NULL)
|
|
px_combo_free(c);
|
|
|
|
PG_RETURN_BOOL((c != NULL) ? true : false);
|
|
}
|
|
|
|
static void *
|
|
find_provider(text *name,
|
|
PFN provider_lookup,
|
|
char *desc, int silent)
|
|
{
|
|
void *res;
|
|
char *buf;
|
|
int err;
|
|
|
|
buf = downcase_truncate_identifier(VARDATA(name),
|
|
VARSIZE(name) - VARHDRSZ,
|
|
false);
|
|
|
|
err = provider_lookup(buf, &res);
|
|
|
|
if (err && !silent)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
|
|
errmsg("Cannot use \"%s\": %s", buf, px_strerror(err))));
|
|
|
|
pfree(buf);
|
|
|
|
return err ? NULL : res;
|
|
}
|