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cb5427ee47
timing, I know :)) At the moment the digest() function returns hexadecimal coded hash, but I want it to return pure binary. I have also included functions encode() and decode() which support 'base64' and 'hex' encodings, so if anyone needs digest() in hex he can do encode(digest(...), 'hex'). Main reason for it is "to do one thing and do it well" :) Another reason is if someone needs really lot of digesting, in the end he wants to store the binary not the hexadecimal result. It is really silly to convert it to hex then back to binary again. As I said if someone needs hex he can get it. Well, and the real reason that I am doing encrypt()/decrypt() functions and _they_ return binary. For testing I like to see it in hex occasionally, but it is really wrong to let them return hex. Only now it caught my eye that hex-coding in digest() is wrong. When doing digest() I thought about 'common case' but hacking with psql is probably _not_ the common case :) Marko Kreen
135 lines
3.2 KiB
C
135 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 1.4 2001/01/24 03:46:16 momjian 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, 0);
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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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