142 lines
3.4 KiB
C
142 lines
3.4 KiB
C
/** \ingroup HMAC_m
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* \file hmac.c
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*
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* HMAC message authentication code, code.
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*/
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/*
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* Copyright (c) 1999, 2000, 2002 Virtual Unlimited B.V.
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*
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* Author: Bob Deblier <bob@virtualunlimited.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include "system.h"
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#include "hmac.h"
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#include "mp32.h"
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#include "endianness.h"
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#include "debug.h"
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#define HMAC_IPAD 0x36
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#define HMAC_OPAD 0x5c
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/*@-boundswrite@*/
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int hmacSetup(hmacParam* hp, const hashFunction* hash, hashFunctionParam* param, const uint32* key, int keybits)
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{
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register int i, rc;
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int keywords = (((uint32)keybits + 31) >> 5); /* rounded up */
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int keybytes = (((uint32)keybits ) >> 3);
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/* if the key is too large, hash it first */
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if (keybytes > 64)
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{
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uint32 keydigest[16];
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byte* tmp;
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/* if the hash digest is too large, this doesn't help */
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if (hash->digestsize > 64)
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return -1;
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if (hash->reset(param))
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return -1;
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tmp = (byte*) malloc(keybytes);
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if (tmp == (byte*) 0)
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return -1;
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/* before we can hash the key, we need to encode it! */
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(void) encodeIntsPartial(key, tmp, keybytes);
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rc = hash->update(param, tmp, keybytes);
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free(tmp);
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if (rc)
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return -1;
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memset(keydigest, 0, sizeof(keydigest));
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if (hash->digest(param, keydigest))
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return -1;
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keywords = hash->digestsize >> 2;
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keybytes = hash->digestsize;
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(void) encodeInts(keydigest, hp->kxi, keybytes);
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(void) encodeInts(keydigest, hp->kxo, keybytes);
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}
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else if (keybytes > 0)
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{
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(void) encodeIntsPartial(key, hp->kxi, keybytes);
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(void) encodeIntsPartial(key, hp->kxo, keybytes);
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}
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else
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return -1;
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for (i = 0; i < keybytes; i++)
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{
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hp->kxi[i] ^= HMAC_IPAD;
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hp->kxo[i] ^= HMAC_OPAD;
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}
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for (i = keybytes; i < 64; i++)
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{
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hp->kxi[i] = HMAC_IPAD;
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hp->kxo[i] = HMAC_OPAD;
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}
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return hmacReset(hp, hash, param);
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}
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/*@=boundswrite@*/
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int hmacReset(hmacParam* hp, const hashFunction* hash, hashFunctionParam* param)
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{
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if (hash->reset(param))
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return -1;
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if (hash->update(param, hp->kxi, 64))
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return -1;
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return 0;
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}
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int hmacUpdate(/*@unused@*/ hmacParam* hp, const hashFunction* hash, hashFunctionParam* param, const byte* data, int size)
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{
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return hash->update(param, data, size);
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}
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int hmacDigest(hmacParam* hp, const hashFunction* hash, hashFunctionParam* param, uint32* data)
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{
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if (hash->digest(param, data))
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return -1;
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if (hash->update(param, hp->kxo, 64))
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return -1;
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/* digestsize is in bytes; divide by 4 to get the number of words */
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/*@-compdef@*/ /* FIX: *data undef ??? Code looks bogus ... */
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(void) encodeInts((const javaint*) data, (byte*) data, hash->digestsize >> 2);
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/*@=compdef@*/
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if (hash->update(param, (const byte*) data, hash->digestsize))
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return -1;
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if (hash->digest(param, data))
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return -1;
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return 0;
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}
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