src/common/wpa_common.h

   1 /*
   2  * WPA definitions shared between hostapd and wpa_supplicant
   3  * Copyright (c) 2002-2013, Jouni Malinen <j@w1.fi>
   4  *
   5  * This software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  */
   8
   9 #ifndef WPA_COMMON_H
  10 #define WPA_COMMON_H
  11
  12 #define WPA_MAX_SSID_LEN 32
  13
  14 /* IEEE 802.11i */
  15 #define PMKID_LEN 16
  16 #define PMK_LEN 32
  17 #define WPA_REPLAY_COUNTER_LEN 8
  18 #define WPA_NONCE_LEN 32
  19 #define WPA_KEY_RSC_LEN 8
  20 #define WPA_GMK_LEN 32
  21 #define WPA_GTK_MAX_LEN 32
  22
  23 #define WPA_ALLOWED_PAIRWISE_CIPHERS \
  24 (WPA_CIPHER_CCMP | WPA_CIPHER_GCMP | WPA_CIPHER_TKIP | WPA_CIPHER_NONE | \
  25 WPA_CIPHER_GCMP_256 | WPA_CIPHER_CCMP_256)
  26 #define WPA_ALLOWED_GROUP_CIPHERS \
  27 (WPA_CIPHER_CCMP | WPA_CIPHER_GCMP | WPA_CIPHER_TKIP | WPA_CIPHER_WEP104 | \
  28 WPA_CIPHER_WEP40 | WPA_CIPHER_GCMP_256 | WPA_CIPHER_CCMP_256 | \
  29 WPA_CIPHER_GTK_NOT_USED)
  30
  31 #define WPA_SELECTOR_LEN 4
  32 #define WPA_VERSION 1
  33 #define RSN_SELECTOR_LEN 4
  34 #define RSN_VERSION 1
  35
  36 #define RSN_SELECTOR(a, b, c, d) \
  37         ((((u32) (a)) << 24) | (((u32) (b)) << 16) | (((u32) (c)) << 8) | \
  38          (u32) (d))
  39
  40 #define WPA_AUTH_KEY_MGMT_NONE RSN_SELECTOR(0x00, 0x50, 0xf2, 0)
  41 #define WPA_AUTH_KEY_MGMT_UNSPEC_802_1X RSN_SELECTOR(0x00, 0x50, 0xf2, 1)
  42 #define WPA_AUTH_KEY_MGMT_PSK_OVER_802_1X RSN_SELECTOR(0x00, 0x50, 0xf2, 2)
  43 #define WPA_AUTH_KEY_MGMT_CCKM RSN_SELECTOR(0x00, 0x40, 0x96, 0)
  44 #define WPA_CIPHER_SUITE_NONE RSN_SELECTOR(0x00, 0x50, 0xf2, 0)
  45 #define WPA_CIPHER_SUITE_WEP40 RSN_SELECTOR(0x00, 0x50, 0xf2, 1)
  46 #define WPA_CIPHER_SUITE_TKIP RSN_SELECTOR(0x00, 0x50, 0xf2, 2)
  47 #if 0
  48 #define WPA_CIPHER_SUITE_WRAP RSN_SELECTOR(0x00, 0x50, 0xf2, 3)
  49 #endif
  50 #define WPA_CIPHER_SUITE_CCMP RSN_SELECTOR(0x00, 0x50, 0xf2, 4)
  51 #define WPA_CIPHER_SUITE_WEP104 RSN_SELECTOR(0x00, 0x50, 0xf2, 5)
  52
  53
  54 #define RSN_AUTH_KEY_MGMT_UNSPEC_802_1X RSN_SELECTOR(0x00, 0x0f, 0xac, 1)
  55 #define RSN_AUTH_KEY_MGMT_PSK_OVER_802_1X RSN_SELECTOR(0x00, 0x0f, 0xac, 2)
  56 #ifdef CONFIG_IEEE80211R
  57 #define RSN_AUTH_KEY_MGMT_FT_802_1X RSN_SELECTOR(0x00, 0x0f, 0xac, 3)
  58 #define RSN_AUTH_KEY_MGMT_FT_PSK RSN_SELECTOR(0x00, 0x0f, 0xac, 4)
  59 #endif /* CONFIG_IEEE80211R */
  60 #define RSN_AUTH_KEY_MGMT_802_1X_SHA256 RSN_SELECTOR(0x00, 0x0f, 0xac, 5)
  61 #define RSN_AUTH_KEY_MGMT_PSK_SHA256 RSN_SELECTOR(0x00, 0x0f, 0xac, 6)
  62 #define RSN_AUTH_KEY_MGMT_TPK_HANDSHAKE RSN_SELECTOR(0x00, 0x0f, 0xac, 7)
  63 #define RSN_AUTH_KEY_MGMT_SAE RSN_SELECTOR(0x00, 0x0f, 0xac, 8)
  64 #define RSN_AUTH_KEY_MGMT_FT_SAE RSN_SELECTOR(0x00, 0x0f, 0xac, 9)
  65 #define RSN_AUTH_KEY_MGMT_802_1X_SUITE_B RSN_SELECTOR(0x00, 0x0f, 0xac, 11)
  66 #define RSN_AUTH_KEY_MGMT_802_1X_SUITE_B_384 RSN_SELECTOR(0x00, 0x0f, 0xac, 12)
  67 #define RSN_AUTH_KEY_MGMT_FT_802_1X_SUITE_B_384 \
  68 RSN_SELECTOR(0x00, 0x0f, 0xac, 13)
  69 #define RSN_AUTH_KEY_MGMT_CCKM RSN_SELECTOR(0x00, 0x40, 0x96, 0x00)
  70 #define RSN_AUTH_KEY_MGMT_OSEN RSN_SELECTOR(0x50, 0x6f, 0x9a, 0x01)
  71
  72 #define RSN_CIPHER_SUITE_NONE RSN_SELECTOR(0x00, 0x0f, 0xac, 0)
  73 #define RSN_CIPHER_SUITE_WEP40 RSN_SELECTOR(0x00, 0x0f, 0xac, 1)
  74 #define RSN_CIPHER_SUITE_TKIP RSN_SELECTOR(0x00, 0x0f, 0xac, 2)
  75 #if 0
  76 #define RSN_CIPHER_SUITE_WRAP RSN_SELECTOR(0x00, 0x0f, 0xac, 3)
  77 #endif
  78 #define RSN_CIPHER_SUITE_CCMP RSN_SELECTOR(0x00, 0x0f, 0xac, 4)
  79 #define RSN_CIPHER_SUITE_WEP104 RSN_SELECTOR(0x00, 0x0f, 0xac, 5)
  80 #define RSN_CIPHER_SUITE_AES_128_CMAC RSN_SELECTOR(0x00, 0x0f, 0xac, 6)
  81 #define RSN_CIPHER_SUITE_NO_GROUP_ADDRESSED RSN_SELECTOR(0x00, 0x0f, 0xac, 7)
  82 #define RSN_CIPHER_SUITE_GCMP RSN_SELECTOR(0x00, 0x0f, 0xac, 8)
  83 #define RSN_CIPHER_SUITE_GCMP_256 RSN_SELECTOR(0x00, 0x0f, 0xac, 9)
  84 #define RSN_CIPHER_SUITE_CCMP_256 RSN_SELECTOR(0x00, 0x0f, 0xac, 10)
  85 #define RSN_CIPHER_SUITE_BIP_GMAC_128 RSN_SELECTOR(0x00, 0x0f, 0xac, 11)
  86 #define RSN_CIPHER_SUITE_BIP_GMAC_256 RSN_SELECTOR(0x00, 0x0f, 0xac, 12)
  87 #define RSN_CIPHER_SUITE_BIP_CMAC_256 RSN_SELECTOR(0x00, 0x0f, 0xac, 13)
  88
  89 /* EAPOL-Key Key Data Encapsulation
  90  * GroupKey and PeerKey require encryption, otherwise, encryption is optional.
  91  */
  92 #define RSN_KEY_DATA_GROUPKEY RSN_SELECTOR(0x00, 0x0f, 0xac, 1)
  93 #if 0
  94 #define RSN_KEY_DATA_STAKEY RSN_SELECTOR(0x00, 0x0f, 0xac, 2)
  95 #endif
  96 #define RSN_KEY_DATA_MAC_ADDR RSN_SELECTOR(0x00, 0x0f, 0xac, 3)
  97 #define RSN_KEY_DATA_PMKID RSN_SELECTOR(0x00, 0x0f, 0xac, 4)
  98 #ifdef CONFIG_PEERKEY
  99 #define RSN_KEY_DATA_SMK RSN_SELECTOR(0x00, 0x0f, 0xac, 5)
 100 #define RSN_KEY_DATA_NONCE RSN_SELECTOR(0x00, 0x0f, 0xac, 6)
 101 #define RSN_KEY_DATA_LIFETIME RSN_SELECTOR(0x00, 0x0f, 0xac, 7)
 102 #define RSN_KEY_DATA_ERROR RSN_SELECTOR(0x00, 0x0f, 0xac, 8)
 103 #endif /* CONFIG_PEERKEY */
 104 #ifdef CONFIG_IEEE80211W
 105 #define RSN_KEY_DATA_IGTK RSN_SELECTOR(0x00, 0x0f, 0xac, 9)
 106 #endif /* CONFIG_IEEE80211W */
 107 #define RSN_KEY_DATA_KEYID RSN_SELECTOR(0x00, 0x0f, 0xac, 10)
 108 #define RSN_KEY_DATA_MULTIBAND_GTK RSN_SELECTOR(0x00, 0x0f, 0xac, 11)
 109 #define RSN_KEY_DATA_MULTIBAND_KEYID RSN_SELECTOR(0x00, 0x0f, 0xac, 12)
 110
 111 #define WFA_KEY_DATA_IP_ADDR_REQ RSN_SELECTOR(0x50, 0x6f, 0x9a, 4)
 112 #define WFA_KEY_DATA_IP_ADDR_ALLOC RSN_SELECTOR(0x50, 0x6f, 0x9a, 5)
 113
 114 #define WPA_OUI_TYPE RSN_SELECTOR(0x00, 0x50, 0xf2, 1)
 115
 116 #define RSN_SELECTOR_PUT(a, val) WPA_PUT_BE32((u8 *) (a), (val))
 117 #define RSN_SELECTOR_GET(a) WPA_GET_BE32((const u8 *) (a))
 118
 119 #define RSN_NUM_REPLAY_COUNTERS_1 0
 120 #define RSN_NUM_REPLAY_COUNTERS_2 1
 121 #define RSN_NUM_REPLAY_COUNTERS_4 2
 122 #define RSN_NUM_REPLAY_COUNTERS_16 3
 123
 124
 125 #ifdef _MSC_VER
 126 #pragma pack(push, 1)
 127 #endif /* _MSC_VER */
 128
 129 #ifdef CONFIG_IEEE80211W
 130 #define WPA_IGTK_LEN 16
 131 #define WPA_IGTK_MAX_LEN 32
 132 #endif /* CONFIG_IEEE80211W */
 133
 134
 135 /* IEEE 802.11, 7.3.2.25.3 RSN Capabilities */
 136 #define WPA_CAPABILITY_PREAUTH BIT(0)
 137 #define WPA_CAPABILITY_NO_PAIRWISE BIT(1)
 138 /* B2-B3: PTKSA Replay Counter */
 139 /* B4-B5: GTKSA Replay Counter */
 140 #define WPA_CAPABILITY_MFPR BIT(6)
 141 #define WPA_CAPABILITY_MFPC BIT(7)
 142 /* B8: Reserved */
 143 #define WPA_CAPABILITY_PEERKEY_ENABLED BIT(9)
 144 #define WPA_CAPABILITY_SPP_A_MSDU_CAPABLE BIT(10)
 145 #define WPA_CAPABILITY_SPP_A_MSDU_REQUIRED BIT(11)
 146 #define WPA_CAPABILITY_PBAC BIT(12)
 147 #define WPA_CAPABILITY_EXT_KEY_ID_FOR_UNICAST BIT(13)
 148 /* B14-B15: Reserved */
 149
 150
 151 /* IEEE 802.11r */
 152 #define MOBILITY_DOMAIN_ID_LEN 2
 153 #define FT_R0KH_ID_MAX_LEN 48
 154 #define FT_R1KH_ID_LEN 6
 155 #define WPA_PMK_NAME_LEN 16
 156
 157
 158 /* IEEE 802.11, 8.5.2 EAPOL-Key frames */
 159 #define WPA_KEY_INFO_TYPE_MASK ((u16) (BIT(0) | BIT(1) | BIT(2)))
 160 #define WPA_KEY_INFO_TYPE_AKM_DEFINED 0
 161 #define WPA_KEY_INFO_TYPE_HMAC_MD5_RC4 BIT(0)
 162 #define WPA_KEY_INFO_TYPE_HMAC_SHA1_AES BIT(1)
 163 #define WPA_KEY_INFO_TYPE_AES_128_CMAC 3
 164 #define WPA_KEY_INFO_KEY_TYPE BIT(3) /* 1 = Pairwise, 0 = Group key */
 165 /* bit4..5 is used in WPA, but is reserved in IEEE 802.11i/RSN */
 166 #define WPA_KEY_INFO_KEY_INDEX_MASK (BIT(4) | BIT(5))
 167 #define WPA_KEY_INFO_KEY_INDEX_SHIFT 4
 168 #define WPA_KEY_INFO_INSTALL BIT(6) /* pairwise */
 169 #define WPA_KEY_INFO_TXRX BIT(6) /* group */
 170 #define WPA_KEY_INFO_ACK BIT(7)
 171 #define WPA_KEY_INFO_MIC BIT(8)
 172 #define WPA_KEY_INFO_SECURE BIT(9)
 173 #define WPA_KEY_INFO_ERROR BIT(10)
 174 #define WPA_KEY_INFO_REQUEST BIT(11)
 175 #define WPA_KEY_INFO_ENCR_KEY_DATA BIT(12) /* IEEE 802.11i/RSN only */
 176 #define WPA_KEY_INFO_SMK_MESSAGE BIT(13)
 177
 178
 179 struct wpa_eapol_key {
 180         u8 type;
 181         /* Note: key_info, key_length, and key_data_length are unaligned */
 182         u8 key_info[2]; /* big endian */
 183         u8 key_length[2]; /* big endian */
 184         u8 replay_counter[WPA_REPLAY_COUNTER_LEN];
 185         u8 key_nonce[WPA_NONCE_LEN];
 186         u8 key_iv[16];
 187         u8 key_rsc[WPA_KEY_RSC_LEN];
 188         u8 key_id[8]; /* Reserved in IEEE 802.11i/RSN */
 189         u8 key_mic[16];
 190         u8 key_data_length[2]; /* big endian */
 191         /* followed by key_data_length bytes of key_data */
 192 } STRUCT_PACKED;
 193
 194 /**
 195  * struct wpa_ptk - WPA Pairwise Transient Key
 196  * IEEE Std 802.11i-2004 - 8.5.1.2 Pairwise key hierarchy
 197  */
 198 struct wpa_ptk {
 199         u8 kck[16]; /* EAPOL-Key Key Confirmation Key (KCK) */
 200         u8 kek[16]; /* EAPOL-Key Key Encryption Key (KEK) */
 201         u8 tk1[16]; /* Temporal Key 1 (TK1) */
 202         union {
 203                 u8 tk2[16]; /* Temporal Key 2 (TK2) */
 204                 struct {
 205                         u8 tx_mic_key[8];
 206                         u8 rx_mic_key[8];
 207                 } auth;
 208         } u;
 209 } STRUCT_PACKED;
 210
 211
 212 /* WPA IE version 1
 213  * 00-50-f2:1 (OUI:OUI type)
 214  * 0x01 0x00 (version; little endian)
 215  * (all following fields are optional:)
 216  * Group Suite Selector (4 octets) (default: TKIP)
 217  * Pairwise Suite Count (2 octets, little endian) (default: 1)
 218  * Pairwise Suite List (4 * n octets) (default: TKIP)
 219  * Authenticated Key Management Suite Count (2 octets, little endian)
 220  *    (default: 1)
 221  * Authenticated Key Management Suite List (4 * n octets)
 222  *    (default: unspec 802.1X)
 223  * WPA Capabilities (2 octets, little endian) (default: 0)
 224  */
 225
 226 struct wpa_ie_hdr {
 227         u8 elem_id;
 228         u8 len;
 229         u8 oui[4]; /* 24-bit OUI followed by 8-bit OUI type */
 230         u8 version[2]; /* little endian */
 231 } STRUCT_PACKED;
 232
 233
 234 /* 1/4: PMKID
 235  * 2/4: RSN IE
 236  * 3/4: one or two RSN IEs + GTK IE (encrypted)
 237  * 4/4: empty
 238  * 1/2: GTK IE (encrypted)
 239  * 2/2: empty
 240  */
 241
 242 /* RSN IE version 1
 243  * 0x01 0x00 (version; little endian)
 244  * (all following fields are optional:)
 245  * Group Suite Selector (4 octets) (default: CCMP)
 246  * Pairwise Suite Count (2 octets, little endian) (default: 1)
 247  * Pairwise Suite List (4 * n octets) (default: CCMP)
 248  * Authenticated Key Management Suite Count (2 octets, little endian)
 249  *    (default: 1)
 250  * Authenticated Key Management Suite List (4 * n octets)
 251  *    (default: unspec 802.1X)
 252  * RSN Capabilities (2 octets, little endian) (default: 0)
 253  * PMKID Count (2 octets) (default: 0)
 254  * PMKID List (16 * n octets)
 255  * Management Group Cipher Suite (4 octets) (default: AES-128-CMAC)
 256  */
 257
 258 struct rsn_ie_hdr {
 259         u8 elem_id; /* WLAN_EID_RSN */
 260         u8 len;
 261         u8 version[2]; /* little endian */
 262 } STRUCT_PACKED;
 263
 264
 265 #ifdef CONFIG_PEERKEY
 266 enum {
 267         STK_MUI_4WAY_STA_AP = 1,
 268         STK_MUI_4WAY_STAT_STA = 2,
 269         STK_MUI_GTK = 3,
 270         STK_MUI_SMK = 4
 271 };
 272
 273 enum {
 274         STK_ERR_STA_NR = 1,
 275         STK_ERR_STA_NRSN = 2,
 276         STK_ERR_CPHR_NS = 3,
 277         STK_ERR_NO_STSL = 4
 278 };
 279 #endif /* CONFIG_PEERKEY */
 280
 281 struct rsn_error_kde {
 282         be16 mui;
 283         be16 error_type;
 284 } STRUCT_PACKED;
 285
 286 #ifdef CONFIG_IEEE80211W
 287 #define WPA_IGTK_KDE_PREFIX_LEN (2 + 6)
 288 struct wpa_igtk_kde {
 289         u8 keyid[2];
 290         u8 pn[6];
 291         u8 igtk[WPA_IGTK_MAX_LEN];
 292 } STRUCT_PACKED;
 293 #endif /* CONFIG_IEEE80211W */
 294
 295 #ifdef CONFIG_IEEE80211R
 296 struct rsn_mdie {
 297         u8 mobility_domain[MOBILITY_DOMAIN_ID_LEN];
 298         u8 ft_capab;
 299 } STRUCT_PACKED;
 300
 301 #define RSN_FT_CAPAB_FT_OVER_DS BIT(0)
 302 #define RSN_FT_CAPAB_FT_RESOURCE_REQ_SUPP BIT(1)
 303
 304 struct rsn_ftie {
 305         u8 mic_control[2];
 306         u8 mic[16];
 307         u8 anonce[WPA_NONCE_LEN];
 308         u8 snonce[WPA_NONCE_LEN];
 309         /* followed by optional parameters */
 310 } STRUCT_PACKED;
 311
 312 #define FTIE_SUBELEM_R1KH_ID 1
 313 #define FTIE_SUBELEM_GTK 2
 314 #define FTIE_SUBELEM_R0KH_ID 3
 315 #define FTIE_SUBELEM_IGTK 4
 316
 317 struct rsn_rdie {
 318         u8 id;
 319         u8 descr_count;
 320         le16 status_code;
 321 } STRUCT_PACKED;
 322
 323 #endif /* CONFIG_IEEE80211R */
 324
 325 #ifdef _MSC_VER
 326 #pragma pack(pop)
 327 #endif /* _MSC_VER */
 328
 329
 330 int wpa_eapol_key_mic(const u8 *key, int ver, const u8 *buf, size_t len,
 331                       u8 *mic);
 332 void wpa_pmk_to_ptk(const u8 *pmk, size_t pmk_len, const char *label,
 333                     const u8 *addr1, const u8 *addr2,
 334                     const u8 *nonce1, const u8 *nonce2,
 335                     u8 *ptk, size_t ptk_len, int use_sha256);
 336
 337 #ifdef CONFIG_IEEE80211R
 338 int wpa_ft_mic(const u8 *kck, const u8 *sta_addr, const u8 *ap_addr,
 339                u8 transaction_seqnum, const u8 *mdie, size_t mdie_len,
 340                const u8 *ftie, size_t ftie_len,
 341                const u8 *rsnie, size_t rsnie_len,
 342                const u8 *ric, size_t ric_len, u8 *mic);
 343 void wpa_derive_pmk_r0(const u8 *xxkey, size_t xxkey_len,
 344                        const u8 *ssid, size_t ssid_len,
 345                        const u8 *mdid, const u8 *r0kh_id, size_t r0kh_id_len,
 346                        const u8 *s0kh_id, u8 *pmk_r0, u8 *pmk_r0_name);
 347 void wpa_derive_pmk_r1_name(const u8 *pmk_r0_name, const u8 *r1kh_id,
 348                             const u8 *s1kh_id, u8 *pmk_r1_name);
 349 void wpa_derive_pmk_r1(const u8 *pmk_r0, const u8 *pmk_r0_name,
 350                        const u8 *r1kh_id, const u8 *s1kh_id,
 351                        u8 *pmk_r1, u8 *pmk_r1_name);
 352 void wpa_pmk_r1_to_ptk(const u8 *pmk_r1, const u8 *snonce, const u8 *anonce,
 353                        const u8 *sta_addr, const u8 *bssid,
 354                        const u8 *pmk_r1_name,
 355                        u8 *ptk, size_t ptk_len, u8 *ptk_name);
 356 #endif /* CONFIG_IEEE80211R */
 357
 358 struct wpa_ie_data {
 359         int proto;
 360         int pairwise_cipher;
 361         int group_cipher;
 362         int key_mgmt;
 363         int capabilities;
 364         size_t num_pmkid;
 365         const u8 *pmkid;
 366         int mgmt_group_cipher;
 367 };
 368
 369
 370 int wpa_parse_wpa_ie_rsn(const u8 *rsn_ie, size_t rsn_ie_len,
 371                          struct wpa_ie_data *data);
 372 int wpa_parse_wpa_ie_wpa(const u8 *wpa_ie, size_t wpa_ie_len,
 373                          struct wpa_ie_data *data);
 374
 375 void rsn_pmkid(const u8 *pmk, size_t pmk_len, const u8 *aa, const u8 *spa,
 376                u8 *pmkid, int use_sha256);
 377
 378 const char * wpa_cipher_txt(int cipher);
 379 const char * wpa_key_mgmt_txt(int key_mgmt, int proto);
 380 int wpa_compare_rsn_ie(int ft_initial_assoc,
 381                        const u8 *ie1, size_t ie1len,
 382                        const u8 *ie2, size_t ie2len);
 383 int wpa_insert_pmkid(u8 *ies, size_t ies_len, const u8 *pmkid);
 384
 385 struct wpa_ft_ies {
 386         const u8 *mdie;
 387         size_t mdie_len;
 388         const u8 *ftie;
 389         size_t ftie_len;
 390         const u8 *r1kh_id;
 391         const u8 *gtk;
 392         size_t gtk_len;
 393         const u8 *r0kh_id;
 394         size_t r0kh_id_len;
 395         const u8 *rsn;
 396         size_t rsn_len;
 397         const u8 *rsn_pmkid;
 398         const u8 *tie;
 399         size_t tie_len;
 400         const u8 *igtk;
 401         size_t igtk_len;
 402         const u8 *ric;
 403         size_t ric_len;
 404 };
 405
 406 int wpa_ft_parse_ies(const u8 *ies, size_t ies_len, struct wpa_ft_ies *parse);
 407
 408 int wpa_cipher_key_len(int cipher);
 409 int wpa_cipher_rsc_len(int cipher);
 410 int wpa_cipher_to_alg(int cipher);
 411 int wpa_cipher_valid_pairwise(int cipher);
 412 int wpa_cipher_valid_mgmt_group(int cipher);
 413 u32 wpa_cipher_to_suite(int proto, int cipher);
 414 int rsn_cipher_put_suites(u8 *pos, int ciphers);
 415 int wpa_cipher_put_suites(u8 *pos, int ciphers);
 416 int wpa_pick_pairwise_cipher(int ciphers, int none_allowed);
 417 int wpa_pick_group_cipher(int ciphers);
 418 int wpa_parse_cipher(const char *value);
 419 int wpa_write_ciphers(char *start, char *end, int ciphers, const char *delim);
 420 int wpa_select_ap_group_cipher(int wpa, int wpa_pairwise, int rsn_pairwise);
 421
 422 #endif /* WPA_COMMON_H */