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handshake: Quote relevant section from 802.11

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To make reading the code easier
This commit is contained in:
Denis Kenzior 2017-01-31 12:03:51 -06:00
parent 1f52bfb047
commit 415c209276
1 changed files with 13 additions and 1 deletions
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14
src/handshake.c
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@ -500,7 +500,19 @@ const uint8_t *handshake_util_find_igtk_kde(const uint8_t *data,
return find_kde(data, data_len, out_igtk_len, igtk_oui);
}
/* Unwrap a GTK / IGTK included in an FTE following 12.8.5 text */
/*
* Unwrap a GTK / IGTK included in an FTE following 802.11-2012, Section 12.8.5:
*
* "If a GTK or an IGTK are included, the Key field of the subelement shall be
* encrypted using KEK and the NIST AES key wrap algorithm. The Key field shall
* be padded before encrypting if the key length is less than 16 octets or if
* it is not a multiple of 8. The padding consists of appending a single octet
* 0xdd followed by zero or more 0x00 octets. When processing a received
* message, the receiver shall ignore this trailing padding. Addition of
* padding does not change the value of the Key Length field. Note that the
* length of the encrypted Key field can be determined from the length of the
* GTK or IGTK subelement.
*/
bool handshake_decode_fte_key(struct handshake_state *s, const uint8_t *wrapped,
size_t key_len, uint8_t *key_out)
{