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