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The PTK is generated by concatenating the following attributes: PMK, A
+P nonce (ANonce), STA nonce (SNonce), AP MAC address, and STA MAC add
+ress.
You should better check this as the order is important.

my $a = "Pairwise key expansion"; # application-specific data
my $b = $amac.$smac.$snonce.$anonce;
my $r = "";
    for(my $i=0;$i<4;$i++){
        my $data = $a."\x00".$b.$i;

DK = PBKDF2(PRF, Password, Salt, c, dkLen)