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Use a temporary PTK buffer during 4-way handshake when rekeying PTK so that the new EAPOL-Key frame MIC values are checked against the new PTK and frames are decrypted using the old PTK. Take the new PTK into use once msg 4/4 is processed and clear RSC counters at that point (including moving of RSC update to avoid setting RSC based on the msg 4/4). In addition, add a workaround to handle supplicant implementations that set Secure bit to one during PTK rekeying 4-way handshake in msg 2/4. This was previously assumed to be msg 4/4, but the key data contents can be used to figure out whether this is msg 2/4 even if the Secure bit is set to one. Signed-hostap: Jouni Malinen <jouni@qca.qualcomm.com>