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[key-manager] update ComputeKey to use BigEndian::WriteUnit32 (#4087)

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Abtin Keshavarzian
2019-08-12 09:07:10 -07:00
committed by Jonathan Hui
parent 7d42350693
commit f9f8d2c690
1 changed files with 3 additions and 5 deletions
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src/core/thread/key_manager.cpp
+3 -5
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@@ -34,6 +34,7 @@
#include "key_manager.hpp"
#include "common/code_utils.hpp"
#include "common/encoding.hpp"
#include "common/instance.hpp"
#include "common/locator-getters.hpp"
#include "common/timer.hpp"
@@ -158,14 +159,11 @@ exit:
void KeyManager::ComputeKey(uint32_t aKeySequence, uint8_t *aKey)
{
Crypto::HmacSha256 hmac;
uint8_t keySequenceBytes[4];
uint8_t keySequenceBytes[sizeof(uint32_t)];
hmac.Start(mMasterKey.m8, sizeof(mMasterKey.m8));
keySequenceBytes[0] = (aKeySequence >> 24) & 0xff;
keySequenceBytes[1] = (aKeySequence >> 16) & 0xff;
keySequenceBytes[2] = (aKeySequence >> 8) & 0xff;
keySequenceBytes[3] = aKeySequence & 0xff;
Encoding::BigEndian::WriteUint32(aKeySequence, keySequenceBytes);
hmac.Update(keySequenceBytes, sizeof(keySequenceBytes));
hmac.Update(kThreadString, sizeof(kThreadString));