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The basic rule we follow here is to always first include 'postgres.h' or 'postgres_fe.h' whichever is applicable, then system header includes and then Postgres header includes. In this, we also follow that all the Postgres header includes are in order based on their ASCII value. We generally follow these rules, but the code has deviated in many places. This commit makes it consistent just for contrib modules. The later commits will enforce similar rules in other parts of code. Author: Vignesh C Reviewed-by: Amit Kapila Discussion: https://postgr.es/m/CALDaNm2Sznv8RR6Ex-iJO6xAdsxgWhCoETkaYX=+9DW3q0QCfA@mail.gmail.com
309 lines
6.2 KiB
C
309 lines
6.2 KiB
C
/*
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* pgp-s2k.c
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* OpenPGP string2key functions.
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*
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* Copyright (c) 2005 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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* contrib/pgcrypto/pgp-s2k.c
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*/
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#include "postgres.h"
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#include "pgp.h"
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#include "px.h"
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static int
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calc_s2k_simple(PGP_S2K *s2k, PX_MD *md, const uint8 *key,
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unsigned key_len)
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{
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unsigned md_rlen;
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uint8 buf[PGP_MAX_DIGEST];
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unsigned preload;
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unsigned remain;
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uint8 *dst = s2k->key;
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md_rlen = px_md_result_size(md);
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remain = s2k->key_len;
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preload = 0;
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while (remain > 0)
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{
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px_md_reset(md);
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if (preload)
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{
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memset(buf, 0, preload);
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px_md_update(md, buf, preload);
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}
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preload++;
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px_md_update(md, key, key_len);
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px_md_finish(md, buf);
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if (remain > md_rlen)
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{
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memcpy(dst, buf, md_rlen);
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dst += md_rlen;
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remain -= md_rlen;
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}
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else
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{
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memcpy(dst, buf, remain);
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remain = 0;
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}
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}
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px_memset(buf, 0, sizeof(buf));
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return 0;
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}
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static int
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calc_s2k_salted(PGP_S2K *s2k, PX_MD *md, const uint8 *key, unsigned key_len)
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{
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unsigned md_rlen;
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uint8 buf[PGP_MAX_DIGEST];
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unsigned preload = 0;
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uint8 *dst;
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unsigned remain;
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md_rlen = px_md_result_size(md);
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dst = s2k->key;
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remain = s2k->key_len;
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while (remain > 0)
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{
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px_md_reset(md);
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if (preload > 0)
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{
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memset(buf, 0, preload);
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px_md_update(md, buf, preload);
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}
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preload++;
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px_md_update(md, s2k->salt, PGP_S2K_SALT);
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px_md_update(md, key, key_len);
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px_md_finish(md, buf);
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if (remain > md_rlen)
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{
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memcpy(dst, buf, md_rlen);
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remain -= md_rlen;
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dst += md_rlen;
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}
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else
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{
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memcpy(dst, buf, remain);
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remain = 0;
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}
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}
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px_memset(buf, 0, sizeof(buf));
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return 0;
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}
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static int
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calc_s2k_iter_salted(PGP_S2K *s2k, PX_MD *md, const uint8 *key,
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unsigned key_len)
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{
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unsigned md_rlen;
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uint8 buf[PGP_MAX_DIGEST];
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uint8 *dst;
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unsigned preload = 0;
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unsigned remain,
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c,
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curcnt,
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count;
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count = s2k_decode_count(s2k->iter);
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md_rlen = px_md_result_size(md);
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remain = s2k->key_len;
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dst = s2k->key;
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while (remain > 0)
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{
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px_md_reset(md);
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if (preload)
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{
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memset(buf, 0, preload);
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px_md_update(md, buf, preload);
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}
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preload++;
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px_md_update(md, s2k->salt, PGP_S2K_SALT);
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px_md_update(md, key, key_len);
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curcnt = PGP_S2K_SALT + key_len;
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while (curcnt < count)
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{
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if (curcnt + PGP_S2K_SALT < count)
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c = PGP_S2K_SALT;
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else
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c = count - curcnt;
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px_md_update(md, s2k->salt, c);
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curcnt += c;
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if (curcnt + key_len < count)
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c = key_len;
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else if (curcnt < count)
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c = count - curcnt;
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else
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break;
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px_md_update(md, key, c);
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curcnt += c;
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}
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px_md_finish(md, buf);
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if (remain > md_rlen)
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{
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memcpy(dst, buf, md_rlen);
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remain -= md_rlen;
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dst += md_rlen;
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}
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else
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{
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memcpy(dst, buf, remain);
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remain = 0;
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}
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}
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px_memset(buf, 0, sizeof(buf));
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return 0;
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}
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/*
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* Decide PGP_S2K_ISALTED iteration count (in OpenPGP one-byte representation)
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*
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* Too small: weak
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* Too big: slow
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* gpg defaults to 96 => 65536 iters
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*
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* For our default (count=-1) we let it float a bit: 96 + 32 => between 65536
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* and 262144 iterations.
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*
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* Otherwise, find the smallest number which provides at least the specified
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* iteration count.
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*/
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static uint8
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decide_s2k_iter(unsigned rand_byte, int count)
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{
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int iter;
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if (count == -1)
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return 96 + (rand_byte & 0x1F);
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/* this is a bit brute-force, but should be quick enough */
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for (iter = 0; iter <= 255; iter++)
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if (s2k_decode_count(iter) >= count)
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return iter;
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return 255;
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}
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int
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pgp_s2k_fill(PGP_S2K *s2k, int mode, int digest_algo, int count)
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{
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int res = 0;
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uint8 tmp;
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s2k->mode = mode;
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s2k->digest_algo = digest_algo;
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switch (s2k->mode)
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{
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case PGP_S2K_SIMPLE:
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break;
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case PGP_S2K_SALTED:
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if (!pg_strong_random(s2k->salt, PGP_S2K_SALT))
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return PXE_NO_RANDOM;
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break;
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case PGP_S2K_ISALTED:
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if (!pg_strong_random(s2k->salt, PGP_S2K_SALT))
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return PXE_NO_RANDOM;
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if (!pg_strong_random(&tmp, 1))
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return PXE_NO_RANDOM;
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s2k->iter = decide_s2k_iter(tmp, count);
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break;
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default:
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res = PXE_PGP_BAD_S2K_MODE;
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}
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return res;
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}
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int
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pgp_s2k_read(PullFilter *src, PGP_S2K *s2k)
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{
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int res = 0;
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GETBYTE(src, s2k->mode);
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GETBYTE(src, s2k->digest_algo);
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switch (s2k->mode)
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{
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case 0:
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break;
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case 1:
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res = pullf_read_fixed(src, 8, s2k->salt);
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break;
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case 3:
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res = pullf_read_fixed(src, 8, s2k->salt);
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if (res < 0)
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break;
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GETBYTE(src, s2k->iter);
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break;
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default:
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res = PXE_PGP_BAD_S2K_MODE;
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}
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return res;
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}
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int
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pgp_s2k_process(PGP_S2K *s2k, int cipher, const uint8 *key, int key_len)
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{
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int res;
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PX_MD *md;
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s2k->key_len = pgp_get_cipher_key_size(cipher);
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if (s2k->key_len <= 0)
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return PXE_PGP_UNSUPPORTED_CIPHER;
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res = pgp_load_digest(s2k->digest_algo, &md);
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if (res < 0)
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return res;
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switch (s2k->mode)
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{
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case 0:
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res = calc_s2k_simple(s2k, md, key, key_len);
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break;
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case 1:
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res = calc_s2k_salted(s2k, md, key, key_len);
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break;
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case 3:
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res = calc_s2k_iter_salted(s2k, md, key, key_len);
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break;
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default:
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res = PXE_PGP_BAD_S2K_MODE;
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}
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px_md_free(md);
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return res;
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}
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