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00015 #include "includes.h"
00016
00017 #include "common.h"
00018 #include "crypto/sha1.h"
00019 #include "eap_pax_common.h"
00020
00021
00036 int eap_pax_kdf(u8 mac_id, const u8 *key, size_t key_len,
00037 const char *identifier,
00038 const u8 *entropy, size_t entropy_len,
00039 size_t output_len, u8 *output)
00040 {
00041 u8 mac[SHA1_MAC_LEN];
00042 u8 counter, *pos;
00043 const u8 *addr[3];
00044 size_t len[3];
00045 size_t num_blocks, left;
00046
00047 num_blocks = (output_len + EAP_PAX_MAC_LEN - 1) / EAP_PAX_MAC_LEN;
00048 if (identifier == NULL || num_blocks >= 255)
00049 return -1;
00050
00051
00052 if (mac_id != EAP_PAX_MAC_HMAC_SHA1_128)
00053 return -1;
00054
00055 addr[0] = (const u8 *) identifier;
00056 len[0] = os_strlen(identifier);
00057 addr[1] = entropy;
00058 len[1] = entropy_len;
00059 addr[2] = &counter;
00060 len[2] = 1;
00061
00062 pos = output;
00063 left = output_len;
00064 for (counter = 1; counter <= (u8) num_blocks; counter++) {
00065 size_t clen = left > EAP_PAX_MAC_LEN ? EAP_PAX_MAC_LEN : left;
00066 hmac_sha1_vector(key, key_len, 3, addr, len, mac);
00067 os_memcpy(pos, mac, clen);
00068 pos += clen;
00069 left -= clen;
00070 }
00071
00072 return 0;
00073 }
00074
00075
00092 int eap_pax_mac(u8 mac_id, const u8 *key, size_t key_len,
00093 const u8 *data1, size_t data1_len,
00094 const u8 *data2, size_t data2_len,
00095 const u8 *data3, size_t data3_len,
00096 u8 *mac)
00097 {
00098 u8 hash[SHA1_MAC_LEN];
00099 const u8 *addr[3];
00100 size_t len[3];
00101 size_t count;
00102
00103
00104 if (mac_id != EAP_PAX_MAC_HMAC_SHA1_128)
00105 return -1;
00106
00107 addr[0] = data1;
00108 len[0] = data1_len;
00109 addr[1] = data2;
00110 len[1] = data2_len;
00111 addr[2] = data3;
00112 len[2] = data3_len;
00113
00114 count = (data1 ? 1 : 0) + (data2 ? 1 : 0) + (data3 ? 1 : 0);
00115 hmac_sha1_vector(key, key_len, count, addr, len, hash);
00116 os_memcpy(mac, hash, EAP_PAX_MAC_LEN);
00117
00118 return 0;
00119 }
00120
00121
00132 int eap_pax_initial_key_derivation(u8 mac_id, const u8 *ak, const u8 *e,
00133 u8 *mk, u8 *ck, u8 *ick)
00134 {
00135 wpa_printf(MSG_DEBUG, "EAP-PAX: initial key derivation");
00136 if (eap_pax_kdf(mac_id, ak, EAP_PAX_AK_LEN, "Master Key",
00137 e, 2 * EAP_PAX_RAND_LEN, EAP_PAX_MK_LEN, mk) ||
00138 eap_pax_kdf(mac_id, mk, EAP_PAX_MK_LEN, "Confirmation Key",
00139 e, 2 * EAP_PAX_RAND_LEN, EAP_PAX_CK_LEN, ck) ||
00140 eap_pax_kdf(mac_id, mk, EAP_PAX_MK_LEN, "Integrity Check Key",
00141 e, 2 * EAP_PAX_RAND_LEN, EAP_PAX_ICK_LEN, ick))
00142 return -1;
00143
00144 wpa_hexdump_key(MSG_MSGDUMP, "EAP-PAX: AK", ak, EAP_PAX_AK_LEN);
00145 wpa_hexdump_key(MSG_MSGDUMP, "EAP-PAX: MK", mk, EAP_PAX_MK_LEN);
00146 wpa_hexdump_key(MSG_MSGDUMP, "EAP-PAX: CK", ck, EAP_PAX_CK_LEN);
00147 wpa_hexdump_key(MSG_MSGDUMP, "EAP-PAX: ICK", ick, EAP_PAX_ICK_LEN);
00148
00149 return 0;
00150 }