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mesh: Coding style cleanup for AEK derivation

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Clean up the mesh_rsn_derive_aek() function by using proper macros and
pointer to the location within the context block.

Signed-off-by: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2016-06-18 14:19:42 +03:00
parent a59c5e9235
commit f5ba6923d0
1 changed files with 14 additions and 5 deletions
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19
wpa_supplicant/mesh_rsn.c
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@ -363,18 +363,27 @@ mesh_rsn_derive_aek(struct mesh_rsn *rsn, struct sta_info *sta)
{ {
u8 *myaddr = rsn->wpa_s->own_addr; u8 *myaddr = rsn->wpa_s->own_addr;
u8 *peer = sta->addr; u8 *peer = sta->addr;
u8 *addr1 = peer, *addr2 = myaddr; u8 *addr1, *addr2;
u8 context[AES_BLOCK_SIZE]; u8 context[RSN_SELECTOR_LEN + 2 * ETH_ALEN], *ptr = context;
/*
* AEK = KDF-Hash-256(PMK, "AEK Derivation", Selected AKM Suite ||
* min(localMAC, peerMAC) || max(localMAC, peerMAC))
*/
/* Selected AKM Suite: SAE */ /* Selected AKM Suite: SAE */
RSN_SELECTOR_PUT(context, RSN_AUTH_KEY_MGMT_SAE); RSN_SELECTOR_PUT(ptr, RSN_AUTH_KEY_MGMT_SAE);
ptr += RSN_SELECTOR_LEN;
if (os_memcmp(myaddr, peer, ETH_ALEN) < 0) { if (os_memcmp(myaddr, peer, ETH_ALEN) < 0) {
addr1 = myaddr; addr1 = myaddr;
addr2 = peer; addr2 = peer;
} else {
addr1 = peer;
addr2 = myaddr;
} }
os_memcpy(context + 4, addr1, ETH_ALEN); os_memcpy(ptr, addr1, ETH_ALEN);
os_memcpy(context + 10, addr2, ETH_ALEN); ptr += ETH_ALEN;
os_memcpy(ptr, addr2, ETH_ALEN);
sha256_prf(sta->sae->pmk, sizeof(sta->sae->pmk), "AEK Derivation", sha256_prf(sta->sae->pmk, sizeof(sta->sae->pmk), "AEK Derivation",
context, sizeof(context), sta->aek, sizeof(sta->aek)); context, sizeof(context), sta->aek, sizeof(sta->aek));