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FT: PTK derivation using SHA384-based AKM

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Signed-off-by: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2018-06-04 15:16:54 +03:00
parent 7880a6a2b8
commit 40a2eb1164
1 changed files with 34 additions and 3 deletions
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37
src/common/wpa_common.c
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@ -1566,11 +1566,19 @@ int wpa_pmk_r1_to_ptk(const u8 *pmk_r1, size_t pmk_r1_len,
size_t len[6];
u8 tmp[2 * WPA_KCK_MAX_LEN + 2 * WPA_KEK_MAX_LEN + WPA_TK_MAX_LEN];
size_t ptk_len, offset;
int use_sha384 = wpa_key_mgmt_sha384(akmp);
/*
* PTK = KDF-PTKLen(PMK-R1, "FT-PTK", SNonce || ANonce ||
* BSSID || STA-ADDR)
*/
wpa_printf(MSG_DEBUG, "FT: Derive PTK using KDF-%s",
use_sha384 ? "SHA384" : "SHA256");
wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", pmk_r1, pmk_r1_len);
wpa_hexdump(MSG_DEBUG, "FT: SNonce", snonce, WPA_NONCE_LEN);
wpa_hexdump(MSG_DEBUG, "FT: ANonce", anonce, WPA_NONCE_LEN);
wpa_printf(MSG_DEBUG, "FT: BSSID=" MACSTR " STA-ADDR=" MACSTR,
MAC2STR(bssid), MAC2STR(sta_addr));
pos = buf;
os_memcpy(pos, snonce, WPA_NONCE_LEN);
pos += WPA_NONCE_LEN;
@ -1589,14 +1597,37 @@ int wpa_pmk_r1_to_ptk(const u8 *pmk_r1, size_t pmk_r1_len,
ptk_len = ptk->kck_len + ptk->kek_len + ptk->tk_len +
ptk->kck2_len + ptk->kek2_len;
if (sha256_prf(pmk_r1, PMK_LEN, "FT-PTK", buf, pos - buf,
tmp, ptk_len) < 0)
return -1;
#ifdef CONFIG_SHA384
if (use_sha384) {
if (pmk_r1_len != SHA384_MAC_LEN) {
wpa_printf(MSG_ERROR,
"FT: Unexpected PMK-R1 length %d (expected %d)",
(int) pmk_r1_len, SHA384_MAC_LEN);
return -1;
}
if (sha384_prf(pmk_r1, pmk_r1_len, "FT-PTK",
buf, pos - buf, tmp, ptk_len) < 0)
return -1;
}
#endif /* CONFIG_SHA384 */
if (!use_sha384) {
if (pmk_r1_len != PMK_LEN) {
wpa_printf(MSG_ERROR,
"FT: Unexpected PMK-R1 length %d (expected %d)",
(int) pmk_r1_len, PMK_LEN);
return -1;
}
if (sha256_prf(pmk_r1, pmk_r1_len, "FT-PTK",
buf, pos - buf, tmp, ptk_len) < 0)
return -1;
}
wpa_hexdump_key(MSG_DEBUG, "FT: PTK", tmp, ptk_len);
/*
* PTKName = Truncate-128(SHA-256(PMKR1Name || "FT-PTKN" || SNonce ||
* ANonce || BSSID || STA-ADDR))
*/
wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", pmk_r1_name, WPA_PMK_NAME_LEN);
addr[0] = pmk_r1_name;
len[0] = WPA_PMK_NAME_LEN;
addr[1] = (const u8 *) "FT-PTKN";