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SAE: Add generation of the confirm message fields

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Signed-hostap: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2012-12-30 22:28:57 +02:00
parent 146f6c9a00
commit fb8fcc2950
4 changed files with 38 additions and 8 deletions
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6
src/ap/ieee802_11.c
View File

@ -355,13 +355,11 @@ static struct wpabuf * auth_build_sae_confirm(struct hostapd_data *hapd,
{ {
struct wpabuf *buf; struct wpabuf *buf;
buf = wpabuf_alloc(2); buf = wpabuf_alloc(SAE_CONFIRM_MAX_LEN);
if (buf == NULL) if (buf == NULL)
return NULL; return NULL;
wpabuf_put_le16(buf, sta->sae->send_confirm); sae_write_confirm(sta->sae, buf);
sta->sae->send_confirm++;
/* TODO: Confirm */
return buf; return buf;
} }

32
src/common/sae.c
View File

@ -542,3 +542,35 @@ u16 sae_parse_commit(struct sae_data *sae, const u8 *data, size_t len)
return WLAN_STATUS_SUCCESS; return WLAN_STATUS_SUCCESS;
} }
void sae_write_confirm(struct sae_data *sae, struct wpabuf *buf)
{
const u8 *sc;
const u8 *addr[5];
size_t len[5];
/* Send-Confirm */
sc = wpabuf_put(buf, 0);
wpabuf_put_le16(buf, sae->send_confirm);
sae->send_confirm++;
/* Confirm
* CN(key, X, Y, Z, ...) =
* HMAC-SHA256(key, D2OS(X) || D2OS(Y) || D2OS(Z) | ...)
* confirm = CN(KCK, send-confirm, commit-scalar, COMMIT-ELEMENT,
* peer-commit-scalar, PEER-COMMIT-ELEMENT)
*/
addr[0] = sc;
len[0] = 2;
addr[1] = sae->own_commit_scalar;
len[1] = 32;
addr[2] = sae->own_commit_element;
len[2] = 2 * 32;
addr[3] = sae->peer_commit_scalar;
len[3] = 32;
addr[4] = sae->peer_commit_element;
len[4] = 2 * 32;
hmac_sha256_vector(sae->kck, sizeof(sae->kck), 5, addr, len,
wpabuf_put(buf, SHA256_MAC_LEN));
}

2
src/common/sae.h
View File

@ -10,6 +10,7 @@
#define SAE_H #define SAE_H
#define SAE_COMMIT_MAX_LEN (2 + 3 * 32) #define SAE_COMMIT_MAX_LEN (2 + 3 * 32)
#define SAE_CONFIRM_MAX_LEN (2 + 32)
struct sae_data { struct sae_data {
enum { SAE_INIT, SAE_COMMIT, SAE_CONFIRM } state; enum { SAE_INIT, SAE_COMMIT, SAE_CONFIRM } state;
@ -30,5 +31,6 @@ int sae_prepare_commit(const u8 *addr1, const u8 *addr2,
int sae_process_commit(struct sae_data *sae); int sae_process_commit(struct sae_data *sae);
void sae_write_commit(struct sae_data *sae, struct wpabuf *buf); void sae_write_commit(struct sae_data *sae, struct wpabuf *buf);
u16 sae_parse_commit(struct sae_data *sae, const u8 *data, size_t len); u16 sae_parse_commit(struct sae_data *sae, const u8 *data, size_t len);
void sae_write_confirm(struct sae_data *sae, struct wpabuf *buf);
#endif /* SAE_H */ #endif /* SAE_H */

6
wpa_supplicant/sme.c
View File

@ -77,15 +77,13 @@ static struct wpabuf * sme_auth_build_sae_confirm(struct wpa_supplicant *wpa_s)
{ {
struct wpabuf *buf; struct wpabuf *buf;
buf = wpabuf_alloc(4 + 2); buf = wpabuf_alloc(4 + SAE_CONFIRM_MAX_LEN);
if (buf == NULL) if (buf == NULL)
return NULL; return NULL;
wpabuf_put_le16(buf, 2); /* Transaction seq# */ wpabuf_put_le16(buf, 2); /* Transaction seq# */
wpabuf_put_le16(buf, WLAN_STATUS_SUCCESS); wpabuf_put_le16(buf, WLAN_STATUS_SUCCESS);
wpabuf_put_le16(buf, wpa_s->sme.sae.send_confirm); sae_write_confirm(&wpa_s->sme.sae, buf);
wpa_s->sme.sae.send_confirm++;
/* TODO: Confirm */
return buf; return buf;
} }