| /* OpenBSC kitchen sink */ |
| |
| /* (C) 2015 by sysmocom s.m.f.c GmbH <info@sysmocom.de> |
| * 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 <http://www.gnu.org/licenses/>. |
| * |
| */ |
| |
| #include <openbsc/utils.h> |
| #include <osmocom/core/utils.h> |
| #include <osmocom/core/bit64gen.h> |
| |
| /* 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; |
| } |
| |