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ClamAV is an open source (GPLv2) anti-virus toolkit.
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clamav/libclamav/sha256.c

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/*-
* Copyright (c) 2001-2003 Allan Saddi <allan@saddi.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY ALLAN SADDI AND HIS CONTRIBUTORS ``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 ALLAN SADDI OR HIS 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.
*
* $Id: sha256.c 680 2003-07-25 21:57:49Z asaddi $
*/
/*
* Define WORDS_BIGENDIAN if compiling on a big-endian architecture.
*
* Define SHA256_TEST to test the implementation using the NIST's
* sample messages. The output should be:
*
* ba7816bf 8f01cfea 414140de 5dae2223 b00361a3 96177a9c b410ff61 f20015ad
* 248d6a61 d20638b8 e5c02693 0c3e6039 a33ce459 64ff2167 f6ecedd4 19db06c1
* cdc76e5c 9914fb92 81a1c7e2 84d73e67 f1809a48 a497200e 046d39cc c7112cd0
*/
#ifdef HAVE_CONFIG_H
#include "clamav-config.h"
#endif /* HAVE_CONFIG_H */
#if HAVE_INTTYPES_H
# include <inttypes.h>
#else
# if HAVE_STDINT_H
# include <stdint.h>
# endif
#endif
#include <string.h>
#include "sha256.h"
#ifndef lint
static const char rcsid[] =
"$Id: sha256.c 680 2003-07-25 21:57:49Z asaddi $";
#endif /* !lint */
#define ROTL(x, n) (((x) << (n)) | ((x) >> (32 - (n))))
#define ROTR(x, n) (((x) >> (n)) | ((x) << (32 - (n))))
#define Ch(x, y, z) ((z) ^ ((x) & ((y) ^ (z))))
#define Maj(x, y, z) (((x) & ((y) | (z))) | ((y) & (z)))
#define SIGMA0(x) (ROTR((x), 2) ^ ROTR((x), 13) ^ ROTR((x), 22))
#define SIGMA1(x) (ROTR((x), 6) ^ ROTR((x), 11) ^ ROTR((x), 25))
#define sigma0(x) (ROTR((x), 7) ^ ROTR((x), 18) ^ ((x) >> 3))
#define sigma1(x) (ROTR((x), 17) ^ ROTR((x), 19) ^ ((x) >> 10))
#define DO_ROUND() { \
t1 = h + SIGMA1(e) + Ch(e, f, g) + *(Kp++) + *(W++); \
t2 = SIGMA0(a) + Maj(a, b, c); \
h = g; \
g = f; \
f = e; \
e = d + t1; \
d = c; \
c = b; \
b = a; \
a = t1 + t2; \
}
static const uint32_t K[64] = {
0x428a2f98L, 0x71374491L, 0xb5c0fbcfL, 0xe9b5dba5L,
0x3956c25bL, 0x59f111f1L, 0x923f82a4L, 0xab1c5ed5L,
0xd807aa98L, 0x12835b01L, 0x243185beL, 0x550c7dc3L,
0x72be5d74L, 0x80deb1feL, 0x9bdc06a7L, 0xc19bf174L,
0xe49b69c1L, 0xefbe4786L, 0x0fc19dc6L, 0x240ca1ccL,
0x2de92c6fL, 0x4a7484aaL, 0x5cb0a9dcL, 0x76f988daL,
0x983e5152L, 0xa831c66dL, 0xb00327c8L, 0xbf597fc7L,
0xc6e00bf3L, 0xd5a79147L, 0x06ca6351L, 0x14292967L,
0x27b70a85L, 0x2e1b2138L, 0x4d2c6dfcL, 0x53380d13L,
0x650a7354L, 0x766a0abbL, 0x81c2c92eL, 0x92722c85L,
0xa2bfe8a1L, 0xa81a664bL, 0xc24b8b70L, 0xc76c51a3L,
0xd192e819L, 0xd6990624L, 0xf40e3585L, 0x106aa070L,
0x19a4c116L, 0x1e376c08L, 0x2748774cL, 0x34b0bcb5L,
0x391c0cb3L, 0x4ed8aa4aL, 0x5b9cca4fL, 0x682e6ff3L,
0x748f82eeL, 0x78a5636fL, 0x84c87814L, 0x8cc70208L,
0x90befffaL, 0xa4506cebL, 0xbef9a3f7L, 0xc67178f2L
};
#ifndef RUNTIME_ENDIAN
#if WORDS_BIGENDIAN == 1
#define BYTESWAP(x) (x)
#define BYTESWAP64(x) (x)
#else /* WORDS_BIGENDIAN */
#define BYTESWAP(x) ((ROTR((x), 8) & 0xff00ff00L) | \
(ROTL((x), 8) & 0x00ff00ffL))
#define BYTESWAP64(x) _byteswap64(x)
static inline uint64_t _byteswap64(uint64_t x)
{
uint32_t a = x >> 32;
uint32_t b = (uint32_t) x;
return ((uint64_t) BYTESWAP(b) << 32) | (uint64_t) BYTESWAP(a);
}
#endif /* WORDS_BIGENDIAN */
#else /* !RUNTIME_ENDIAN */
#define BYTESWAP(x) _byteswap(sc->littleEndian, x)
#define BYTESWAP64(x) _byteswap64(sc->littleEndian, x)
#define _BYTESWAP(x) ((ROTR((x), 8) & 0xff00ff00L) | \
(ROTL((x), 8) & 0x00ff00ffL))
#define _BYTESWAP64(x) __byteswap64(x)
static inline uint64_t __byteswap64(uint64_t x)
{
uint32_t a = x >> 32;
uint32_t b = (uint32_t) x;
return ((uint64_t) _BYTESWAP(b) << 32) | (uint64_t) _BYTESWAP(a);
}
static inline uint32_t _byteswap(int littleEndian, uint32_t x)
{
if (!littleEndian)
return x;
else
return _BYTESWAP(x);
}
static inline uint64_t _byteswap64(int littleEndian, uint64_t x)
{
if (!littleEndian)
return x;
else
return _BYTESWAP64(x);
}
static inline void setEndian(int *littleEndianp)
{
union {
uint32_t w;
uint8_t b[4];
} endian;
endian.w = 1L;
*littleEndianp = endian.b[0] != 0;
}
#endif /* !RUNTIME_ENDIAN */
static const uint8_t padding[64] = {
0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
void
sha256_init (SHA256_CTX *sc)
{
#ifdef RUNTIME_ENDIAN
setEndian (&sc->littleEndian);
#endif /* RUNTIME_ENDIAN */
sc->totalLength = 0LL;
sc->hash[0] = 0x6a09e667L;
sc->hash[1] = 0xbb67ae85L;
sc->hash[2] = 0x3c6ef372L;
sc->hash[3] = 0xa54ff53aL;
sc->hash[4] = 0x510e527fL;
sc->hash[5] = 0x9b05688cL;
sc->hash[6] = 0x1f83d9abL;
sc->hash[7] = 0x5be0cd19L;
sc->bufferLength = 0L;
}
static void
burnStack (int size)
{
char buf[128];
memset (buf, 0, sizeof (buf));
size -= sizeof (buf);
if (size > 0)
burnStack (size);
}
static void
SHA256Guts (SHA256_CTX *sc, const uint32_t *cbuf)
{
uint32_t buf[64];
uint32_t *W, *W2, *W7, *W15, *W16;
uint32_t a, b, c, d, e, f, g, h;
uint32_t t1, t2;
const uint32_t *Kp;
int i;
W = buf;
for (i = 15; i >= 0; i--) {
*(W++) = BYTESWAP(*cbuf);
cbuf++;
}
W16 = &buf[0];
W15 = &buf[1];
W7 = &buf[9];
W2 = &buf[14];
for (i = 47; i >= 0; i--) {
*(W++) = sigma1(*W2) + *(W7++) + sigma0(*W15) + *(W16++);
W2++;
W15++;
}
a = sc->hash[0];
b = sc->hash[1];
c = sc->hash[2];
d = sc->hash[3];
e = sc->hash[4];
f = sc->hash[5];
g = sc->hash[6];
h = sc->hash[7];
Kp = K;
W = buf;
#ifndef SHA256_UNROLL
#define SHA256_UNROLL 4
#endif /* !SHA256_UNROLL */
#if SHA256_UNROLL == 1
for (i = 63; i >= 0; i--)
DO_ROUND();
#elif SHA256_UNROLL == 2
for (i = 31; i >= 0; i--) {
DO_ROUND(); DO_ROUND();
}
#elif SHA256_UNROLL == 4
for (i = 15; i >= 0; i--) {
DO_ROUND(); DO_ROUND(); DO_ROUND(); DO_ROUND();
}
#elif SHA256_UNROLL == 8
for (i = 7; i >= 0; i--) {
DO_ROUND(); DO_ROUND(); DO_ROUND(); DO_ROUND();
DO_ROUND(); DO_ROUND(); DO_ROUND(); DO_ROUND();
}
#elif SHA256_UNROLL == 16
for (i = 3; i >= 0; i--) {
DO_ROUND(); DO_ROUND(); DO_ROUND(); DO_ROUND();
DO_ROUND(); DO_ROUND(); DO_ROUND(); DO_ROUND();
DO_ROUND(); DO_ROUND(); DO_ROUND(); DO_ROUND();
DO_ROUND(); DO_ROUND(); DO_ROUND(); DO_ROUND();
}
#elif SHA256_UNROLL == 32
for (i = 1; i >= 0; i--) {
DO_ROUND(); DO_ROUND(); DO_ROUND(); DO_ROUND();
DO_ROUND(); DO_ROUND(); DO_ROUND(); DO_ROUND();
DO_ROUND(); DO_ROUND(); DO_ROUND(); DO_ROUND();
DO_ROUND(); DO_ROUND(); DO_ROUND(); DO_ROUND();
DO_ROUND(); DO_ROUND(); DO_ROUND(); DO_ROUND();
DO_ROUND(); DO_ROUND(); DO_ROUND(); DO_ROUND();
DO_ROUND(); DO_ROUND(); DO_ROUND(); DO_ROUND();
DO_ROUND(); DO_ROUND(); DO_ROUND(); DO_ROUND();
}
#elif SHA256_UNROLL == 64
DO_ROUND(); DO_ROUND(); DO_ROUND(); DO_ROUND();
DO_ROUND(); DO_ROUND(); DO_ROUND(); DO_ROUND();
DO_ROUND(); DO_ROUND(); DO_ROUND(); DO_ROUND();
DO_ROUND(); DO_ROUND(); DO_ROUND(); DO_ROUND();
DO_ROUND(); DO_ROUND(); DO_ROUND(); DO_ROUND();
DO_ROUND(); DO_ROUND(); DO_ROUND(); DO_ROUND();
DO_ROUND(); DO_ROUND(); DO_ROUND(); DO_ROUND();
DO_ROUND(); DO_ROUND(); DO_ROUND(); DO_ROUND();
DO_ROUND(); DO_ROUND(); DO_ROUND(); DO_ROUND();
DO_ROUND(); DO_ROUND(); DO_ROUND(); DO_ROUND();
DO_ROUND(); DO_ROUND(); DO_ROUND(); DO_ROUND();
DO_ROUND(); DO_ROUND(); DO_ROUND(); DO_ROUND();
DO_ROUND(); DO_ROUND(); DO_ROUND(); DO_ROUND();
DO_ROUND(); DO_ROUND(); DO_ROUND(); DO_ROUND();
DO_ROUND(); DO_ROUND(); DO_ROUND(); DO_ROUND();
DO_ROUND(); DO_ROUND(); DO_ROUND(); DO_ROUND();
#else
#error "SHA256_UNROLL must be 1, 2, 4, 8, 16, 32, or 64!"
#endif
sc->hash[0] += a;
sc->hash[1] += b;
sc->hash[2] += c;
sc->hash[3] += d;
sc->hash[4] += e;
sc->hash[5] += f;
sc->hash[6] += g;
sc->hash[7] += h;
}
void
sha256_update (SHA256_CTX *sc, const void *vdata, uint32_t len)
{
const uint8_t *data = vdata;
uint32_t bufferBytesLeft;
uint32_t bytesToCopy;
int needBurn = 0;
#ifdef SHA256_FAST_COPY
if (sc->bufferLength) {
bufferBytesLeft = 64L - sc->bufferLength;
bytesToCopy = bufferBytesLeft;
if (bytesToCopy > len)
bytesToCopy = len;
memcpy (&sc->buffer.bytes[sc->bufferLength], data, bytesToCopy);
sc->totalLength += bytesToCopy * 8L;
sc->bufferLength += bytesToCopy;
data += bytesToCopy;
len -= bytesToCopy;
if (sc->bufferLength == 64L) {
SHA256Guts (sc, sc->buffer.words);
needBurn = 1;
sc->bufferLength = 0L;
}
}
while (len > 63L) {
sc->totalLength += 512L;
SHA256Guts (sc, data);
needBurn = 1;
data += 64L;
len -= 64L;
}
if (len) {
memcpy (&sc->buffer.bytes[sc->bufferLength], data, len);
sc->totalLength += len * 8L;
sc->bufferLength += len;
}
#else /* SHA256_FAST_COPY */
while (len) {
bufferBytesLeft = 64L - sc->bufferLength;
bytesToCopy = bufferBytesLeft;
if (bytesToCopy > len)
bytesToCopy = len;
memcpy (&sc->buffer.bytes[sc->bufferLength], data, bytesToCopy);
sc->totalLength += bytesToCopy * 8L;
sc->bufferLength += bytesToCopy;
data += bytesToCopy;
len -= bytesToCopy;
if (sc->bufferLength == 64L) {
SHA256Guts (sc, sc->buffer.words);
needBurn = 1;
sc->bufferLength = 0L;
}
}
#endif /* SHA256_FAST_COPY */
if (needBurn)
burnStack (sizeof (uint32_t[74]) + sizeof (uint32_t *[6]) + sizeof (int));
}
void
sha256_final (SHA256_CTX *sc, uint8_t hash[SHA256_HASH_SIZE])
{
uint32_t bytesToPad;
uint64_t lengthPad;
int i;
bytesToPad = 120L - sc->bufferLength;
if (bytesToPad > 64L)
bytesToPad -= 64L;
lengthPad = BYTESWAP64(sc->totalLength);
sha256_update (sc, padding, bytesToPad);
sha256_update (sc, &lengthPad, 8L);
if (hash) {
for (i = 0; i < SHA256_HASH_WORDS; i++) {
#ifdef SHA256_FAST_COPY
*((uint32_t *) hash) = BYTESWAP(sc->hash[i]);
#else /* SHA256_FAST_COPY */
hash[0] = (uint8_t) (sc->hash[i] >> 24);
hash[1] = (uint8_t) (sc->hash[i] >> 16);
hash[2] = (uint8_t) (sc->hash[i] >> 8);
hash[3] = (uint8_t) sc->hash[i];
#endif /* SHA256_FAST_COPY */
hash += 4;
}
}
}
#ifdef SHA256_TEST
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int
main (int argc, char *argv[])
{
SHA256_CTX foo;
uint8_t hash[SHA256_HASH_SIZE];
char buf[1000];
int i;
sha256_init (&foo);
sha256_update (&foo, "abc", 3);
sha256_final (&foo, hash);
for (i = 0; i < SHA256_HASH_SIZE;) {
printf ("%02x", hash[i++]);
if (!(i % 4))
printf (" ");
}
printf ("\n");
sha256_init (&foo);
sha256_update (&foo,
"abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq",
56);
sha256_final (&foo, hash);
for (i = 0; i < SHA256_HASH_SIZE;) {
printf ("%02x", hash[i++]);
if (!(i % 4))
printf (" ");
}
printf ("\n");
sha256_init (&foo);
memset (buf, 'a', sizeof (buf));
for (i = 0; i < 1000; i++)
sha256_update (&foo, buf, sizeof (buf));
sha256_final (&foo, hash);
for (i = 0; i < SHA256_HASH_SIZE;) {
printf ("%02x", hash[i++]);
if (!(i % 4))
printf (" ");
}
printf ("\n");
exit (0);
}
#endif /* SHA256_TEST */