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Diffstat (limited to 'openbsc/src/libcommon/utils.c')
| -rw-r--r-- | openbsc/src/libcommon/utils.c | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/openbsc/src/libcommon/utils.c b/openbsc/src/libcommon/utils.c new file mode 100644 index 000000000..c47dcaee2 --- /dev/null +++ b/openbsc/src/libcommon/utils.c @@ -0,0 +1,58 @@ +/* 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; +} + |