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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