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Moved rsn_pmkid() into shared code to avoid duplication

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This commit is contained in:
Jouni Malinen 2009-01-14 21:31:47 +02:00
parent 676ea3413d
commit 13268290b6
5 changed files with 37 additions and 69 deletions
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34
hostapd/pmksa_cache.c
View file

@ -40,40 +40,6 @@ struct rsn_pmksa_cache {
}; };
/**
* rsn_pmkid - Calculate PMK identifier
* @pmk: Pairwise master key
* @pmk_len: Length of pmk in bytes
* @aa: Authenticator address
* @spa: Supplicant address
* @pmkid: Buffer for PMKID
* @use_sha256: Whether to use SHA256-based KDF
*
* IEEE Std 802.11i-2004 - 8.5.1.2 Pairwise key hierarchy
* PMKID = HMAC-SHA1-128(PMK, "PMK Name" || AA || SPA)
*/
void rsn_pmkid(const u8 *pmk, size_t pmk_len, const u8 *aa, const u8 *spa,
u8 *pmkid, int use_sha256)
{
char *title = "PMK Name";
const u8 *addr[3];
const size_t len[3] = { 8, ETH_ALEN, ETH_ALEN };
unsigned char hash[SHA256_MAC_LEN];
addr[0] = (u8 *) title;
addr[1] = aa;
addr[2] = spa;
#ifdef CONFIG_IEEE80211W
if (use_sha256)
hmac_sha256_vector(pmk, pmk_len, 3, addr, len, hash);
else
#endif /* CONFIG_IEEE80211W */
hmac_sha1_vector(pmk, pmk_len, 3, addr, len, hash);
os_memcpy(pmkid, hash, PMKID_LEN);
}
static void pmksa_cache_set_expiration(struct rsn_pmksa_cache *pmksa); static void pmksa_cache_set_expiration(struct rsn_pmksa_cache *pmksa);

2
hostapd/pmksa_cache.h
View file

@ -56,7 +56,5 @@ pmksa_cache_add_okc(struct rsn_pmksa_cache *pmksa,
const u8 *aa, const u8 *pmkid); const u8 *aa, const u8 *pmkid);
void pmksa_cache_to_eapol_data(struct rsn_pmksa_cache_entry *entry, void pmksa_cache_to_eapol_data(struct rsn_pmksa_cache_entry *entry,
struct eapol_state_machine *eapol); struct eapol_state_machine *eapol);
void rsn_pmkid(const u8 *pmk, size_t pmk_len, const u8 *aa, const u8 *spa,
u8 *pmkid, int use_sha256);
#endif /* PMKSA_CACHE_H */ #endif /* PMKSA_CACHE_H */

34
src/common/wpa_common.c
View file

@ -568,3 +568,37 @@ void wpa_pmk_r1_to_ptk(const u8 *pmk_r1, const u8 *snonce, const u8 *anonce,
} }
#endif /* CONFIG_IEEE80211R */ #endif /* CONFIG_IEEE80211R */
/**
* rsn_pmkid - Calculate PMK identifier
* @pmk: Pairwise master key
* @pmk_len: Length of pmk in bytes
* @aa: Authenticator address
* @spa: Supplicant address
* @pmkid: Buffer for PMKID
* @use_sha256: Whether to use SHA256-based KDF
*
* IEEE Std 802.11i-2004 - 8.5.1.2 Pairwise key hierarchy
* PMKID = HMAC-SHA1-128(PMK, "PMK Name" || AA || SPA)
*/
void rsn_pmkid(const u8 *pmk, size_t pmk_len, const u8 *aa, const u8 *spa,
u8 *pmkid, int use_sha256)
{
char *title = "PMK Name";
const u8 *addr[3];
const size_t len[3] = { 8, ETH_ALEN, ETH_ALEN };
unsigned char hash[SHA256_MAC_LEN];
addr[0] = (u8 *) title;
addr[1] = aa;
addr[2] = spa;
#ifdef CONFIG_IEEE80211W
if (use_sha256)
hmac_sha256_vector(pmk, pmk_len, 3, addr, len, hash);
else
#endif /* CONFIG_IEEE80211W */
hmac_sha1_vector(pmk, pmk_len, 3, addr, len, hash);
os_memcpy(pmkid, hash, PMKID_LEN);
}

3
src/common/wpa_common.h
View file

@ -332,4 +332,7 @@ struct wpa_ie_data {
int wpa_parse_wpa_ie_rsn(const u8 *rsn_ie, size_t rsn_ie_len, int wpa_parse_wpa_ie_rsn(const u8 *rsn_ie, size_t rsn_ie_len,
struct wpa_ie_data *data); struct wpa_ie_data *data);
void rsn_pmkid(const u8 *pmk, size_t pmk_len, const u8 *aa, const u8 *spa,
u8 *pmkid, int use_sha256);
#endif /* WPA_COMMON_H */ #endif /* WPA_COMMON_H */

33
src/rsn_supp/pmksa_cache.c
View file

@ -38,39 +38,6 @@ struct rsn_pmksa_cache {
}; };
/**
* rsn_pmkid - Calculate PMK identifier
* @pmk: Pairwise master key
* @pmk_len: Length of pmk in bytes
* @aa: Authenticator address
* @spa: Supplicant address
* @use_sha256: Whether to use SHA256-based KDF
*
* IEEE Std 802.11i-2004 - 8.5.1.2 Pairwise key hierarchy
* PMKID = HMAC-SHA1-128(PMK, "PMK Name" || AA || SPA)
*/
static void rsn_pmkid(const u8 *pmk, size_t pmk_len, const u8 *aa,
const u8 *spa, u8 *pmkid, int use_sha256)
{
char *title = "PMK Name";
const u8 *addr[3];
const size_t len[3] = { 8, ETH_ALEN, ETH_ALEN };
unsigned char hash[SHA256_MAC_LEN];
addr[0] = (u8 *) title;
addr[1] = aa;
addr[2] = spa;
#ifdef CONFIG_IEEE80211W
if (use_sha256)
hmac_sha256_vector(pmk, pmk_len, 3, addr, len, hash);
else
#endif /* CONFIG_IEEE80211W */
hmac_sha1_vector(pmk, pmk_len, 3, addr, len, hash);
os_memcpy(pmkid, hash, PMKID_LEN);
}
static void pmksa_cache_set_expiration(struct rsn_pmksa_cache *pmksa); static void pmksa_cache_set_expiration(struct rsn_pmksa_cache *pmksa);