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5caa3479c2
This warning is new in gcc 4.6 and part of -Wall. This patch cleans up most of the noise, but there are some still warnings that are trickier to remove.
178 lines
3.6 KiB
C
178 lines
3.6 KiB
C
/*
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* px-hmac.c
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* HMAC implementation.
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*
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* Copyright (c) 2001 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/px-hmac.c
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*/
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#include "postgres.h"
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#include "px.h"
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#define HMAC_IPAD 0x36
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#define HMAC_OPAD 0x5C
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static unsigned
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hmac_result_size(PX_HMAC *h)
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{
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return px_md_result_size(h->md);
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}
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static unsigned
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hmac_block_size(PX_HMAC *h)
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{
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return px_md_block_size(h->md);
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}
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static void
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hmac_init(PX_HMAC *h, const uint8 *key, unsigned klen)
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{
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unsigned bs,
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i;
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uint8 *keybuf;
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PX_MD *md = h->md;
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bs = px_md_block_size(md);
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keybuf = px_alloc(bs);
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memset(keybuf, 0, bs);
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if (klen > bs)
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{
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px_md_update(md, key, klen);
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px_md_finish(md, keybuf);
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px_md_reset(md);
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}
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else
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memcpy(keybuf, key, klen);
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for (i = 0; i < bs; i++)
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{
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h->p.ipad[i] = keybuf[i] ^ HMAC_IPAD;
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h->p.opad[i] = keybuf[i] ^ HMAC_OPAD;
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}
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memset(keybuf, 0, bs);
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px_free(keybuf);
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px_md_update(md, h->p.ipad, bs);
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}
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static void
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hmac_reset(PX_HMAC *h)
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{
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PX_MD *md = h->md;
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unsigned bs = px_md_block_size(md);
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px_md_reset(md);
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px_md_update(md, h->p.ipad, bs);
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}
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static void
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hmac_update(PX_HMAC *h, const uint8 *data, unsigned dlen)
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{
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px_md_update(h->md, data, dlen);
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}
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static void
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hmac_finish(PX_HMAC *h, uint8 *dst)
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{
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PX_MD *md = h->md;
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unsigned bs,
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hlen;
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uint8 *buf;
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bs = px_md_block_size(md);
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hlen = px_md_result_size(md);
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buf = px_alloc(hlen);
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px_md_finish(md, buf);
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px_md_reset(md);
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px_md_update(md, h->p.opad, bs);
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px_md_update(md, buf, hlen);
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px_md_finish(md, dst);
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memset(buf, 0, hlen);
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px_free(buf);
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}
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static void
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hmac_free(PX_HMAC *h)
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{
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unsigned bs;
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bs = px_md_block_size(h->md);
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px_md_free(h->md);
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memset(h->p.ipad, 0, bs);
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memset(h->p.opad, 0, bs);
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px_free(h->p.ipad);
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px_free(h->p.opad);
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px_free(h);
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}
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/* PUBLIC FUNCTIONS */
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int
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px_find_hmac(const char *name, PX_HMAC **res)
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{
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int err;
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PX_MD *md;
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PX_HMAC *h;
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unsigned bs;
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err = px_find_digest(name, &md);
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if (err)
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return err;
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bs = px_md_block_size(md);
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if (bs < 2)
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{
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px_md_free(md);
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return PXE_HASH_UNUSABLE_FOR_HMAC;
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}
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h = px_alloc(sizeof(*h));
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h->p.ipad = px_alloc(bs);
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h->p.opad = px_alloc(bs);
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h->md = md;
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h->result_size = hmac_result_size;
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h->block_size = hmac_block_size;
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h->reset = hmac_reset;
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h->update = hmac_update;
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h->finish = hmac_finish;
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h->free = hmac_free;
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h->init = hmac_init;
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*res = h;
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return 0;
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}
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