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

Closes https://github.com/espressif/esp-idf/issues/12976
release/v4.4
zhangyanjiao 2024-03-13 17:34:13 +08:00
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docs/en/api-reference/network/esp_now.rst
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@ -49,9 +49,9 @@ 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.

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docs/zh_CN/api-reference/network/esp_now.rst
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@ -49,9 +49,9 @@ ESP-NOW 使用各个供应商的动作帧传输数据，默认比特率为 1 Mbp
安全
--------
ESP-NOW 采用 CCMP 方法保护供应商特定动作帧的安全，具体可参考 IEEE Std. 802.11-2012。Wi-Fi 设备维护一个初始主密钥 (PMK) 和若干本地主密钥 (LMK)，长度均为 16 个字节。
ESP-NOW 采用 CCMP 方法保护供应商特定动作帧的安全，具体可参考 IEEE Std. 802.11-2012。Wi-Fi 设备维护一个初始主密钥 (PMK) 和若干本地主密钥 (LMKs, 每个配对设备拥有一个 LMK)，长度均为 16 个字节。
* PMK 可使用 AES-128 算法加密 LMK。请调用 :cpp:func:`esp_now_set_pmk()` 设置 PMK。如果未设置 PMK，将使用默认 PMK。
* LMK 可通过 CCMP 方法对供应商特定的动作帧进行加密，最多拥有 6 个不同的 LMK。如果未设置配对设备的 LMK，则动作帧不进行加密。
* LMK 可通过 CCMP 方法对供应商特定的动作帧进行加密，如果未设置配对设备的 LMK，则动作帧不进行加密。
目前，不支持加密组播供应商特定的动作帧。