WPA PSK-key length problem?

[Holger Schurig]

Hmm, I dissected the sent key and got this:

Dest MAC:         00 12 7f 8b 62 30
Source MAC:       00 10 c6 30 9b fe
EAPOL:            88 8e         = ETH_P_EAPOL
Version:          01
Packet Type:      03            = IEEE802_1X_TYPE_EAPOL_KEY
Packet Body Len:  00 77         = 119
key_type:         fe            = EAPOL_KEY_TYPE_WPA
key_info:         01 09
key_len:          00 20
replay_counter:   00 00 00 00 00 00 00 02
key_nonce:        cf 1d 81 62 ab c0 30 7a 7e c0 31 43 c9 0d 49 7f
                  79 97 12 8c 05 36 a7 cd 86 f0 b3 ef 7b 12 0d ec
key_iv:           00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
key_rsc:          00 00 00 00 00 00 00 00
key_id:           00 00 00 00 00 00 00 00
key_mic:          96 5f c7 be 53 3f 7f a7 f9 36 d9 c3 e4 80 e7 62
data_length       00 18         = 24 bytes
WPA-IE:           dd 16 00 50 f2 01 01 00 00 50 f2 02 01 00 00 50
                  f2 02 01 00 00 50 f2 02

But I fail to see why the AP expects 26 bytes.