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docs(wifi): Updated the LMK description in ESP-NOW

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Closes https://github.com/espressif/esp-idf/issues/12976
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zhangyanjiao
2024-03-13 17:34:13 +08:00
parent bb25cc1234
commit 68c887ead7
2 changed files with 4 additions and 4 deletions
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docs/en/api-reference/network/esp_now.rst
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@@ -50,10 +50,10 @@ As ESP-NOW is connectionless, the MAC header is a little different from that of
Security
--------
ESP-NOW uses the CCMP method, which is described in IEEE Std. 802.11-2012, to protect the vendor-specific action frame. The Wi-Fi device maintains a Primary Master Key (PMK) and several Local Master Keys (LMK). The lengths of both PMK and LMk are 16 bytes.
ESP-NOW uses the CCMP method, which is described in IEEE Std. 802.11-2012, to protect the vendor-specific action frame. The Wi-Fi device maintains a Primary Master Key (PMK) and several Local Master Keys (LMKs, each paired device has one LMK). The lengths of both PMK and LMK are 16 bytes.
* PMK is used to encrypt LMK with the AES-128 algorithm. Call :cpp:func:`esp_now_set_pmk()` to set PMK. If PMK is not set, a default PMK will be used.
* LMK of the paired device is used to encrypt the vendor-specific action frame with the CCMP method. The maximum number of different LMKs is six. If the LMK of the paired device is not set, the vendor-specific action frame will not be encrypted.
* LMK of the paired device is used to encrypt the vendor-specific action frame with the CCMP method. If the LMK of the paired device is not set, the vendor-specific action frame will not be encrypted.
Encrypting multicast vendor-specific action frame is not supported.