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/**
* The Whirlpool hashing function.
*
* <P>
* <b>References</b>
*
* <P>
* The Whirlpool algorithm was developed by
* <a href="mailto:pbarreto@scopus.com.br">Paulo S. L. M. Barreto</a> and
* <a href="mailto:vincent.rijmen@cryptomathic.com">Vincent Rijmen</a>.
*
* See
* P.S.L.M. Barreto, V. Rijmen,
* ``The Whirlpool hashing function,''
* NESSIE submission, 2000 (tweaked version, 2001),
* <https://www.cosic.esat.kuleuven.ac.be/nessie/workshop/submissions/whirlpool.zip>
*
* Based on "@version 3.0 (2003.03.12)" by Paulo S.L.M. Barreto and
* Vincent Rijmen. Lookup "reference implementations" on
* <http://planeta.terra.com.br/informatica/paulobarreto/>
*
* =============================================================================
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ''AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
/*
* OpenSSL-specific implementation notes.
*
* WHIRLPOOL_Update as well as one-stroke WHIRLPOOL both expect
* number of *bytes* as input length argument. Bit-oriented routine
* as specified by authors is called WHIRLPOOL_BitUpdate[!] and
* does not have one-stroke counterpart.
*
* WHIRLPOOL_BitUpdate implements byte-oriented loop, essentially
* to serve WHIRLPOOL_Update. This is done for performance.
*
* Unlike authors' reference implementation, block processing
* routine whirlpool_block is designed to operate on multi-block
* input. This is done for perfomance.
*/
#include "wp_locl.h"
#include <openssl/crypto.h>
#include <string.h>
int WHIRLPOOL_Init(WHIRLPOOL_CTX *c)
{
memset (c,0,sizeof(*c));
return(1);
}
int WHIRLPOOL_Update (WHIRLPOOL_CTX *c,const void *_inp,size_t bytes)
{
/* Well, largest suitable chunk size actually is
* (1<<(sizeof(size_t)*8-3))-64, but below number
* is large enough for not to care about excessive
* calls to WHIRLPOOL_BitUpdate... */
size_t chunk = ((size_t)1)<<(sizeof(size_t)*8-4);
const unsigned char *inp = _inp;
while (bytes>=chunk)
{
WHIRLPOOL_BitUpdate(c,inp,chunk*8);
bytes -= chunk;
inp += chunk;
}
if (bytes)
WHIRLPOOL_BitUpdate(c,inp,bytes*8);
return(1);
}
void WHIRLPOOL_BitUpdate(WHIRLPOOL_CTX *c,const void *_inp,size_t bits)
{
size_t n;
unsigned int bitoff = c->bitoff,
bitrem = bitoff%8,
inpgap = (8-(unsigned int)bits%8)&7;
const unsigned char *inp=_inp;
/* This 256-bit increment procedure relies on the size_t
* being natural size of CPU register, so that we don't
* have to mask the value in order to detect overflows. */
c->bitlen[0] += bits;
if (c->bitlen[0] < bits) /* overflow */
{
n = 1;
do { c->bitlen[n]++;
} while(c->bitlen[n]==0
&& ++n<(WHIRLPOOL_COUNTER/sizeof(size_t)));
}
#ifndef OPENSSL_SMALL_FOOTPRINT
reconsider:
if (inpgap==0 && bitrem==0) /* byte-oriented loop */
{
while (bits)
{
if (bitoff==0 && (n=bits/WHIRLPOOL_BBLOCK))
{
whirlpool_block(c,inp,n);
inp += n*WHIRLPOOL_BBLOCK/8;
bits %= WHIRLPOOL_BBLOCK;
}
else
{
unsigned int byteoff = bitoff/8;
bitrem = WHIRLPOOL_BBLOCK - bitoff;/* re-use bitrem */
if (bits >= bitrem)
{
bits -= bitrem;
bitrem /= 8;
memcpy(c->data+byteoff,inp,bitrem);
inp += bitrem;
whirlpool_block(c,c->data,1);
bitoff = 0;
}
else
{
memcpy(c->data+byteoff,inp,bits/8);
bitoff += (unsigned int)bits;
bits = 0;
}
c->bitoff = bitoff;
}
}
}
else /* bit-oriented loop */
#endif
{
/*
inp
|
+-------+-------+-------
|||||||||||||||||||||
+-------+-------+-------
+-------+-------+-------+-------+-------
|||||||||||||| c->data
+-------+-------+-------+-------+-------
|
c->bitoff/8
*/
while (bits)
{
unsigned int byteoff = bitoff/8;
unsigned char b;
#ifndef OPENSSL_SMALL_FOOTPRINT
if (bitrem==inpgap)
{
c->data[byteoff++] |= inp[0] & (0xff>>inpgap);
inpgap = 8-inpgap;
bitoff += inpgap; bitrem = 0; /* bitoff%8 */
bits -= inpgap; inpgap = 0; /* bits%8 */
inp++;
if (bitoff==WHIRLPOOL_BBLOCK)
{
whirlpool_block(c,c->data,1);
bitoff = 0;
}
c->bitoff = bitoff;
goto reconsider;
}
else
#endif
if (bits>=8)
{
b = ((inp[0]<<inpgap) | (inp[1]>>(8-inpgap)));
b &= 0xff;
if (bitrem) c->data[byteoff++] |= b>>bitrem;
else c->data[byteoff++] = b;
bitoff += 8;
bits -= 8;
inp++;
if (bitoff>=WHIRLPOOL_BBLOCK)
{
whirlpool_block(c,c->data,1);
byteoff = 0;
bitoff %= WHIRLPOOL_BBLOCK;
}
if (bitrem) c->data[byteoff] = b<<(8-bitrem);
}
else /* remaining less than 8 bits */
{
b = (inp[0]<<inpgap)&0xff;
if (bitrem) c->data[byteoff++] |= b>>bitrem;
else c->data[byteoff++] = b;
bitoff += (unsigned int)bits;
if (bitoff==WHIRLPOOL_BBLOCK)
{
whirlpool_block(c,c->data,1);
byteoff = 0;
bitoff %= WHIRLPOOL_BBLOCK;
}
if (bitrem) c->data[byteoff] = b<<(8-bitrem);
bits = 0;
}
c->bitoff = bitoff;
}
}
}
int WHIRLPOOL_Final (unsigned char *md,WHIRLPOOL_CTX *c)
{
unsigned int bitoff = c->bitoff,
byteoff = bitoff/8;
size_t i,j,v;
unsigned char *p;
bitoff %= 8;
if (bitoff) c->data[byteoff] |= 0x80>>bitoff;
else c->data[byteoff] = 0x80;
byteoff++;
/* pad with zeros */
if (byteoff > (WHIRLPOOL_BBLOCK/8-WHIRLPOOL_COUNTER))
{
if (byteoff<WHIRLPOOL_BBLOCK/8)
memset(&c->data[byteoff],0,WHIRLPOOL_BBLOCK/8-byteoff);
whirlpool_block(c,c->data,1);
byteoff = 0;
}
if (byteoff < (WHIRLPOOL_BBLOCK/8-WHIRLPOOL_COUNTER))
memset(&c->data[byteoff],0,
(WHIRLPOOL_BBLOCK/8-WHIRLPOOL_COUNTER)-byteoff);
/* smash 256-bit c->bitlen in big-endian order */
p = &c->data[WHIRLPOOL_BBLOCK/8-1]; /* last byte in c->data */
for(i=0;i<WHIRLPOOL_COUNTER/sizeof(size_t);i++)
for(v=c->bitlen[i],j=0;j<sizeof(size_t);j++,v>>=8)
*p-- = (unsigned char)(v&0xff);
whirlpool_block(c,c->data,1);
if (md) {
memcpy(md,c->H.c,WHIRLPOOL_DIGEST_LENGTH);
memset(c,0,sizeof(*c));
return(1);
}
return(0);
}
unsigned char *WHIRLPOOL(const void *inp, size_t bytes,unsigned char *md)
{
WHIRLPOOL_CTX ctx;
static unsigned char m[WHIRLPOOL_DIGEST_LENGTH];
if (md == NULL) md=m;
WHIRLPOOL_Init(&ctx);
WHIRLPOOL_Update(&ctx,inp,bytes);
WHIRLPOOL_Final(md,&ctx);
return(md);
}
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