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258 lines
8.5 KiB
C
258 lines
8.5 KiB
C
/*
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* Copyright 2005-2016 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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/**
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* The Whirlpool hashing function.
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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 performance.
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*/
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#include <openssl/crypto.h>
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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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/*
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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 is large enough for not
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* to care about excessive calls to WHIRLPOOL_BitUpdate...
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*/
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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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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, inpgap = (8 - (unsigned int)bits % 8) & 7;
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const unsigned char *inp = _inp;
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/*
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* This 256-bit increment procedure relies on the size_t being natural
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* size of CPU register, so that we don't have to mask the value in order
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* to detect overflows.
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*/
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c->bitlen[0] += bits;
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if (c->bitlen[0] < bits) { /* overflow */
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n = 1;
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do {
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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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while (bits) {
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if (bitoff == 0 && (n = bits / WHIRLPOOL_BBLOCK)) {
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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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} else {
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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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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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} else {
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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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} 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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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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c->data[byteoff++] |= inp[0] & (0xff >> inpgap);
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inpgap = 8 - inpgap;
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bitoff += inpgap;
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bitrem = 0; /* bitoff%8 */
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bits -= inpgap;
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inpgap = 0; /* bits%8 */
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inp++;
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if (bitoff == WHIRLPOOL_BBLOCK) {
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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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} else
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#endif
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if (bits > 8) {
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b = ((inp[0] << inpgap) | (inp[1] >> (8 - inpgap)));
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b &= 0xff;
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if (bitrem)
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c->data[byteoff++] |= b >> bitrem;
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else
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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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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)
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c->data[byteoff] = b << (8 - bitrem);
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} else { /* remaining less than or equal to 8 bits */
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b = (inp[0] << inpgap) & 0xff;
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if (bitrem)
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c->data[byteoff++] |= b >> bitrem;
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else
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c->data[byteoff++] = b;
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bitoff += (unsigned int)bits;
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if (bitoff == WHIRLPOOL_BBLOCK) {
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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)
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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, 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)
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c->data[byteoff] |= 0x80 >> bitoff;
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else
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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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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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OPENSSL_cleanse(c, 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)
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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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