d08741eab5
are now separate files "postgres.h" and "postgres_fe.h", which are meant to be the primary include files for backend .c files and frontend .c files respectively. By default, only include files meant for frontend use are installed into the installation include directory. There is a new make target 'make install-all-headers' that adds the whole content of the src/include tree to the installed fileset, for use by people who want to develop server-side code without keeping the complete source tree on hand. Cleaned up a whole lot of crufty and inconsistent header inclusions.
136 lines
3.2 KiB
C
136 lines
3.2 KiB
C
/*
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* pgcrypto.c
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* Cryptographic digests for PostgreSQL.
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*
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* Copyright (c) 2000 Marko Kreen
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 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
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* 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
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: pgcrypto.c,v 1.6 2001/02/10 02:31:26 tgl Exp $
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*/
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#include "postgres.h"
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#include "utils/builtins.h"
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#include "pgcrypto.h"
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/*
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* NAMEDATALEN is used for hash names
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*/
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#if NAMEDATALEN < 16
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#error "NAMEDATALEN < 16: too small"
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#endif
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/* exported functions */
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Datum digest(PG_FUNCTION_ARGS);
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Datum digest_exists(PG_FUNCTION_ARGS);
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/* private stuff */
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static pg_digest *
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find_digest(pg_digest *hbuf, text *name, int silent);
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/* SQL function: hash(text, text) returns text */
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PG_FUNCTION_INFO_V1(digest);
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Datum
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digest(PG_FUNCTION_ARGS)
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{
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text *arg;
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text *name;
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uint len, hlen;
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pg_digest *h, _hbuf;
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text *res;
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if (PG_ARGISNULL(0) || PG_ARGISNULL(1))
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PG_RETURN_NULL();
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name = PG_GETARG_TEXT_P(1);
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h = find_digest(&_hbuf, name, 0); /* will give error if fails */
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hlen = h->length(h);
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res = (text *)palloc(hlen + VARHDRSZ);
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VARATT_SIZEP(res) = hlen + VARHDRSZ;
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arg = PG_GETARG_TEXT_P(0);
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len = VARSIZE(arg) - VARHDRSZ;
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h->digest(h, VARDATA(arg), len, VARDATA(res));
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PG_FREE_IF_COPY(arg, 0);
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PG_FREE_IF_COPY(name, 1);
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PG_RETURN_TEXT_P(res);
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}
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/* check if given hash exists */
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PG_FUNCTION_INFO_V1(digest_exists);
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Datum
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digest_exists(PG_FUNCTION_ARGS)
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{
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text *name;
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pg_digest _hbuf, *res;
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if (PG_ARGISNULL(0))
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PG_RETURN_NULL();
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name = PG_GETARG_TEXT_P(0);
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res = find_digest(&_hbuf, name, 1);
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PG_FREE_IF_COPY(name, 0);
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if (res != NULL)
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PG_RETURN_BOOL(true);
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PG_RETURN_BOOL(false);
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}
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static pg_digest *
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find_digest(pg_digest *hbuf, text *name, int silent)
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{
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pg_digest *p;
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char buf[NAMEDATALEN];
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uint len;
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len = VARSIZE(name) - VARHDRSZ;
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if (len >= NAMEDATALEN) {
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if (silent)
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return NULL;
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elog(ERROR, "Hash type does not exist (name too long)");
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}
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memcpy(buf, VARDATA(name), len);
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buf[len] = 0;
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p = pg_find_digest(hbuf, buf);
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if (p == NULL && !silent)
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elog(ERROR, "Hash type does not exist: '%s'", buf);
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return p;
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}
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