/*
* Copyright (c) 2020 Red Hat, Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
* $Id: //eng/uds-releases/jasper/src/uds/nonce.c#3 $
*/
#include "nonce.h"
#include "murmur/MurmurHash3.h"
#include "numeric.h"
#include "random.h"
#include "stringUtils.h"
#include "timeUtils.h"
/*****************************************************************************/
static uint64_t hashStuff(uint64_t start, const void *data, size_t len)
{
uint32_t seed = start ^ (start >> 27);
byte hashBuffer[16];
MurmurHash3_x64_128(data, len, seed, hashBuffer);
return getUInt64LE(hashBuffer + 4);
}
/*****************************************************************************/
static void *memput(void *buf, void *end, const void *data, size_t len)
{
byte *bp = buf;
byte *be = end;
size_t chunk = minSizeT(len, be - bp);
memcpy(bp, data, chunk);
return bp + chunk;
}
/*****************************************************************************/
size_t createUniqueNonceData(byte *buffer, size_t length)
{
AbsTime now = currentTime(CLOCK_REALTIME);
byte *be = buffer + length;
byte *bp = memput(buffer, be, &now, sizeof(now));
uint32_t rand = randomInRange(1, (1<<30) - 1);
bp = memput(bp, be, &rand, sizeof(rand));
while (bp < be) {
size_t n = minSizeT(be - bp, bp - buffer);
memcpy(bp, buffer, n);
bp += n;
}
return bp - buffer;
}
/*****************************************************************************/
uint64_t generateMasterNonce(const void *data, size_t len)
{
return hashStuff(0xa1b1e0fc, data, len);
}
/*****************************************************************************/
uint64_t generateSecondaryNonce(uint64_t nonce,
const void *data,
size_t len)
{
return hashStuff(nonce + 1, data, len);
}