/* OpenBSC kitchen sink */
/* (C) 2015 by sysmocom s.m.f.c GmbH
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation; either version 3 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see .
*
*/
#include
#include
#include
/* Wishful thinking to generate a constant time compare */
int constant_time_cmp(const uint8_t *exp, const uint8_t *rel, const int count)
{
int x = 0, i;
for (i = 0; i < count; ++i)
x |= exp[i] ^ rel[i];
/* if x is zero, all data was identical */
return x? 1 : 0;
}
uint64_t decode_big_endian(const uint8_t *data, size_t data_len)
{
uint64_t value = 0;
while (data_len > 0) {
value = (value << 8) + *data;
data += 1;
data_len -= 1;
}
return value;
}
uint8_t *encode_big_endian(uint64_t value, size_t data_len)
{
static uint8_t buf[sizeof(uint64_t)];
OSMO_ASSERT(data_len <= ARRAY_SIZE(buf));
osmo_store64be_ext(value, buf, data_len);
return buf;
}