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Bluetooth: GATT: Fix byte order for database hash

Core 5.1, Vol 3, Part F, 3.3.1
"Multi-octet fields within the GATT profile shall be sent least
significant octet first (little-endian) with the exception of the
Characteristic Value field. The Characteristic Value and any fields
within it shall be little-endian unless otherwise defined in the
specification which defines the characteristic."

Fixes: GATT/SR/GAS/BV-02-C
Fixes: #17857
Signed-off-by: Mariusz Skamra <>
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MariuszSkamra authored and carlescufi committed Jul 30, 2019
1 parent 09c1c9e commit a56695db9a123ef70a3a9f31db421777b53fb396
Showing with 9 additions and 0 deletions.
  1. +9 −0 subsys/bluetooth/host/gatt.c
@@ -420,6 +420,15 @@ static void db_hash_gen(bool store)

* Core 5.1 does not state the endianess of the hash.
* However Vol 3, Part F, 3.3.1 says that multi-octet Characteristic
* Values shall be LE unless otherwise defined. PTS expects hash to be
* in little endianess as well. bt_smp_aes_cmac calculates the hash in
* big endianess so we have to swap.
sys_mem_swap(db_hash, sizeof(db_hash));

BT_HEXDUMP_DBG(db_hash, sizeof(db_hash), "Hash: ");


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