LCOV - code coverage report
Current view: top level - src/eap_common - eap_pax_common.c (source / functions) Hit Total Coverage
Test: wpa_supplicant/hostapd combined for hwsim test run 1422976643 Lines: 46 50 92.0 %
Date: 2015-02-03 Functions: 3 3 100.0 %

          Line data    Source code
       1             : /*
       2             :  * EAP server/peer: EAP-PAX shared routines
       3             :  * Copyright (c) 2005, 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             : #include "includes.h"
      10             : 
      11             : #include "common.h"
      12             : #include "crypto/sha1.h"
      13             : #include "eap_pax_common.h"
      14             : 
      15             : 
      16             : /**
      17             :  * eap_pax_kdf - PAX Key Derivation Function
      18             :  * @mac_id: MAC ID (EAP_PAX_MAC_*) / currently, only HMAC_SHA1_128 is supported
      19             :  * @key: Secret key (X)
      20             :  * @key_len: Length of the secret key in bytes
      21             :  * @identifier: Public identifier for the key (Y)
      22             :  * @entropy: Exchanged entropy to seed the KDF (Z)
      23             :  * @entropy_len: Length of the entropy in bytes
      24             :  * @output_len: Output len in bytes (W)
      25             :  * @output: Buffer for the derived key
      26             :  * Returns: 0 on success, -1 failed
      27             :  *
      28             :  * RFC 4746, Section 2.6: PAX-KDF-W(X, Y, Z)
      29             :  */
      30         291 : int eap_pax_kdf(u8 mac_id, const u8 *key, size_t key_len,
      31             :                 const char *identifier,
      32             :                 const u8 *entropy, size_t entropy_len,
      33             :                 size_t output_len, u8 *output)
      34             : {
      35             :         u8 mac[SHA1_MAC_LEN];
      36             :         u8 counter, *pos;
      37             :         const u8 *addr[3];
      38             :         size_t len[3];
      39             :         size_t num_blocks, left;
      40             : 
      41         291 :         num_blocks = (output_len + EAP_PAX_MAC_LEN - 1) / EAP_PAX_MAC_LEN;
      42         291 :         if (identifier == NULL || num_blocks >= 255)
      43           0 :                 return -1;
      44             : 
      45             :         /* TODO: add support for EAP_PAX_HMAC_SHA256_128 */
      46         291 :         if (mac_id != EAP_PAX_MAC_HMAC_SHA1_128)
      47           0 :                 return -1;
      48             : 
      49         291 :         addr[0] = (const u8 *) identifier;
      50         291 :         len[0] = os_strlen(identifier);
      51         291 :         addr[1] = entropy;
      52         291 :         len[1] = entropy_len;
      53         291 :         addr[2] = &counter;
      54         291 :         len[2] = 1;
      55             : 
      56         291 :         pos = output;
      57         291 :         left = output_len;
      58         747 :         for (counter = 1; counter <= (u8) num_blocks; counter++) {
      59         456 :                 size_t clen = left > EAP_PAX_MAC_LEN ? EAP_PAX_MAC_LEN : left;
      60         456 :                 hmac_sha1_vector(key, key_len, 3, addr, len, mac);
      61         456 :                 os_memcpy(pos, mac, clen);
      62         456 :                 pos += clen;
      63         456 :                 left -= clen;
      64             :         }
      65             : 
      66         291 :         return 0;
      67             : }
      68             : 
      69             : 
      70             : /**
      71             :  * eap_pax_mac - EAP-PAX MAC
      72             :  * @mac_id: MAC ID (EAP_PAX_MAC_*) / currently, only HMAC_SHA1_128 is supported
      73             :  * @key: Secret key
      74             :  * @key_len: Length of the secret key in bytes
      75             :  * @data1: Optional data, first block; %NULL if not used
      76             :  * @data1_len: Length of data1 in bytes
      77             :  * @data2: Optional data, second block; %NULL if not used
      78             :  * @data2_len: Length of data2 in bytes
      79             :  * @data3: Optional data, third block; %NULL if not used
      80             :  * @data3_len: Length of data3 in bytes
      81             :  * @mac: Buffer for the MAC value (EAP_PAX_MAC_LEN = 16 bytes)
      82             :  * Returns: 0 on success, -1 on failure
      83             :  *
      84             :  * Wrapper function to calculate EAP-PAX MAC.
      85             :  */
      86         341 : int eap_pax_mac(u8 mac_id, const u8 *key, size_t key_len,
      87             :                 const u8 *data1, size_t data1_len,
      88             :                 const u8 *data2, size_t data2_len,
      89             :                 const u8 *data3, size_t data3_len,
      90             :                 u8 *mac)
      91             : {
      92             :         u8 hash[SHA1_MAC_LEN];
      93             :         const u8 *addr[3];
      94             :         size_t len[3];
      95             :         size_t count;
      96             : 
      97             :         /* TODO: add support for EAP_PAX_HMAC_SHA256_128 */
      98         341 :         if (mac_id != EAP_PAX_MAC_HMAC_SHA1_128)
      99           0 :                 return -1;
     100             : 
     101         341 :         addr[0] = data1;
     102         341 :         len[0] = data1_len;
     103         341 :         addr[1] = data2;
     104         341 :         len[1] = data2_len;
     105         341 :         addr[2] = data3;
     106         341 :         len[2] = data3_len;
     107             : 
     108         341 :         count = (data1 ? 1 : 0) + (data2 ? 1 : 0) + (data3 ? 1 : 0);
     109         341 :         hmac_sha1_vector(key, key_len, count, addr, len, hash);
     110         341 :         os_memcpy(mac, hash, EAP_PAX_MAC_LEN);
     111             : 
     112         341 :         return 0;
     113             : }
     114             : 
     115             : 
     116             : /**
     117             :  * eap_pax_initial_key_derivation - EAP-PAX initial key derivation
     118             :  * @mac_id: MAC ID (EAP_PAX_MAC_*) / currently, only HMAC_SHA1_128 is supported
     119             :  * @ak: Authentication Key
     120             :  * @e: Entropy
     121             :  * @mk: Buffer for the derived Master Key
     122             :  * @ck: Buffer for the derived Confirmation Key
     123             :  * @ick: Buffer for the derived Integrity Check Key
     124             :  * @mid: Buffer for the derived Method ID
     125             :  * Returns: 0 on success, -1 on failure
     126             :  */
     127          59 : int eap_pax_initial_key_derivation(u8 mac_id, const u8 *ak, const u8 *e,
     128             :                                    u8 *mk, u8 *ck, u8 *ick, u8 *mid)
     129             : {
     130          59 :         wpa_printf(MSG_DEBUG, "EAP-PAX: initial key derivation");
     131          59 :         if (eap_pax_kdf(mac_id, ak, EAP_PAX_AK_LEN, "Master Key",
     132          59 :                         e, 2 * EAP_PAX_RAND_LEN, EAP_PAX_MK_LEN, mk) ||
     133          59 :             eap_pax_kdf(mac_id, mk, EAP_PAX_MK_LEN, "Confirmation Key",
     134          59 :                         e, 2 * EAP_PAX_RAND_LEN, EAP_PAX_CK_LEN, ck) ||
     135          59 :             eap_pax_kdf(mac_id, mk, EAP_PAX_MK_LEN, "Integrity Check Key",
     136          59 :                         e, 2 * EAP_PAX_RAND_LEN, EAP_PAX_ICK_LEN, ick) ||
     137          59 :             eap_pax_kdf(mac_id, mk, EAP_PAX_MK_LEN, "Method ID",
     138             :                         e, 2 * EAP_PAX_RAND_LEN, EAP_PAX_MID_LEN, mid))
     139           0 :                 return -1;
     140             : 
     141          59 :         wpa_hexdump_key(MSG_MSGDUMP, "EAP-PAX: AK", ak, EAP_PAX_AK_LEN);
     142          59 :         wpa_hexdump_key(MSG_MSGDUMP, "EAP-PAX: MK", mk, EAP_PAX_MK_LEN);
     143          59 :         wpa_hexdump_key(MSG_MSGDUMP, "EAP-PAX: CK", ck, EAP_PAX_CK_LEN);
     144          59 :         wpa_hexdump_key(MSG_MSGDUMP, "EAP-PAX: ICK", ick, EAP_PAX_ICK_LEN);
     145          59 :         wpa_hexdump_key(MSG_MSGDUMP, "EAP-PAX: MID", mid, EAP_PAX_MID_LEN);
     146             : 
     147          59 :         return 0;
     148             : }

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