static int eap_fast_update_icmk(struct eap_sm *sm, struct eap_fast_data *data)
{
u8 isk[32], imck[60];
wpa_printf(MSG_DEBUG, "EAP-FAST: Deriving ICMK[%d] (S-IMCK and CMK)",
data->simck_idx + 1);
/*
* RFC 4851, Section 5.2:
* IMCK[j] = T-PRF(S-IMCK[j-1], "Inner Methods Compound Keys",
* MSK[j], 60)
* S-IMCK[j] = first 40 octets of IMCK[j]
* CMK[j] = last 20 octets of IMCK[j]
*/
if (eap_fast_get_phase2_key(sm, data, isk, sizeof(isk)) < 0)
return -1;
wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: ISK[j]", isk, sizeof(isk));
sha1_t_prf(data->simck, EAP_FAST_SIMCK_LEN,
"Inner Methods Compound Keys",
isk, sizeof(isk), imck, sizeof(imck));
data->simck_idx++;
os_memcpy(data->simck, imck, EAP_FAST_SIMCK_LEN);
wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: S-IMCK[j]",
data->simck, EAP_FAST_SIMCK_LEN);
os_memcpy(data->cmk, imck + EAP_FAST_SIMCK_LEN, EAP_FAST_CMK_LEN);
wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: CMK[j]",
data->cmk, EAP_FAST_CMK_LEN);
return 0;
}
void eap_fast_derive_master_secret(const u8 *pac_key, const u8 *server_random,
const u8 *client_random, u8 *master_secret)
{
#define TLS_RANDOM_LEN 32
#define TLS_MASTER_SECRET_LEN 48
u8 seed[2 * TLS_RANDOM_LEN];
wpa_hexdump(MSG_DEBUG, "EAP-FAST: client_random",
client_random, TLS_RANDOM_LEN);
wpa_hexdump(MSG_DEBUG, "EAP-FAST: server_random",
server_random, TLS_RANDOM_LEN);
/*
* RFC 4851, Section 5.1:
* master_secret = T-PRF(PAC-Key, "PAC to master secret label hash",
* server_random + client_random, 48)
*/
os_memcpy(seed, server_random, TLS_RANDOM_LEN);
os_memcpy(seed + TLS_RANDOM_LEN, client_random, TLS_RANDOM_LEN);
sha1_t_prf(pac_key, EAP_FAST_PAC_KEY_LEN,
"PAC to master secret label hash",
seed, sizeof(seed), master_secret, TLS_MASTER_SECRET_LEN);
wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: master_secret",
master_secret, TLS_MASTER_SECRET_LEN);
}
void eap_fast_derive_eap_msk(const u8 *simck, u8 *msk)
{
/*
* RFC 4851, Section 5.4: EAP Master Session Key Generation
* MSK = T-PRF(S-IMCK[j], "Session Key Generating Function", 64)
*/
sha1_t_prf(simck, EAP_FAST_SIMCK_LEN,
"Session Key Generating Function", (u8 *) "", 0,
msk, EAP_FAST_KEY_LEN);
wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Derived key (MSK)",
msk, EAP_FAST_KEY_LEN);
}
int eap_fast_derive_eap_emsk(const u8 *simck, u8 *emsk)
{
/*
* RFC 4851, Section 5.4: EAP Master Session Key Genreration
* EMSK = T-PRF(S-IMCK[j],
* "Extended Session Key Generating Function", 64)
*/
if (sha1_t_prf(simck, EAP_FAST_SIMCK_LEN,
"Extended Session Key Generating Function", (u8 *) "", 0,
emsk, EAP_EMSK_LEN) < 0)
return -1;
wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Derived key (EMSK)",
emsk, EAP_EMSK_LEN);
return 0;
}
static int test_eap_fast(void)
{
/* RFC 4851, Appendix B.1 */
const u8 pac_key[] = {
0x0B, 0x97, 0x39, 0x0F, 0x37, 0x51, 0x78, 0x09,
0x81, 0x1E, 0xFD, 0x9C, 0x6E, 0x65, 0x94, 0x2B,
0x63, 0x2C, 0xE9, 0x53, 0x89, 0x38, 0x08, 0xBA,
0x36, 0x0B, 0x03, 0x7C, 0xD1, 0x85, 0xE4, 0x14
};
const u8 seed[] = {
0x3F, 0xFB, 0x11, 0xC4, 0x6C, 0xBF, 0xA5, 0x7A,
0x54, 0x40, 0xDA, 0xE8, 0x22, 0xD3, 0x11, 0xD3,
0xF7, 0x6D, 0xE4, 0x1D, 0xD9, 0x33, 0xE5, 0x93,
0x70, 0x97, 0xEB, 0xA9, 0xB3, 0x66, 0xF4, 0x2A,
0x00, 0x00, 0x00, 0x02, 0x6A, 0x66, 0x43, 0x2A,
0x8D, 0x14, 0x43, 0x2C, 0xEC, 0x58, 0x2D, 0x2F,
0xC7, 0x9C, 0x33, 0x64, 0xBA, 0x04, 0xAD, 0x3A,
0x52, 0x54, 0xD6, 0xA5, 0x79, 0xAD, 0x1E, 0x00
};
const u8 master_secret[] = {
0x4A, 0x1A, 0x51, 0x2C, 0x01, 0x60, 0xBC, 0x02,
0x3C, 0xCF, 0xBC, 0x83, 0x3F, 0x03, 0xBC, 0x64,
0x88, 0xC1, 0x31, 0x2F, 0x0B, 0xA9, 0xA2, 0x77,
0x16, 0xA8, 0xD8, 0xE8, 0xBD, 0xC9, 0xD2, 0x29,
0x38, 0x4B, 0x7A, 0x85, 0xBE, 0x16, 0x4D, 0x27,
0x33, 0xD5, 0x24, 0x79, 0x87, 0xB1, 0xC5, 0xA2
};
const u8 key_block[] = {
0x59, 0x59, 0xBE, 0x8E, 0x41, 0x3A, 0x77, 0x74,
0x8B, 0xB2, 0xE5, 0xD3, 0x60, 0xAC, 0x4D, 0x35,
0xDF, 0xFB, 0xC8, 0x1E, 0x9C, 0x24, 0x9C, 0x8B,
0x0E, 0xC3, 0x1D, 0x72, 0xC8, 0x84, 0x9D, 0x57,
0x48, 0x51, 0x2E, 0x45, 0x97, 0x6C, 0x88, 0x70,
0xBE, 0x5F, 0x01, 0xD3, 0x64, 0xE7, 0x4C, 0xBB,
0x11, 0x24, 0xE3, 0x49, 0xE2, 0x3B, 0xCD, 0xEF,
0x7A, 0xB3, 0x05, 0x39, 0x5D, 0x64, 0x8A, 0x44,
0x11, 0xB6, 0x69, 0x88, 0x34, 0x2E, 0x8E, 0x29,
0xD6, 0x4B, 0x7D, 0x72, 0x17, 0x59, 0x28, 0x05,
0xAF, 0xF9, 0xB7, 0xFF, 0x66, 0x6D, 0xA1, 0x96,
0x8F, 0x0B, 0x5E, 0x06, 0x46, 0x7A, 0x44, 0x84,
0x64, 0xC1, 0xC8, 0x0C, 0x96, 0x44, 0x09, 0x98,
0xFF, 0x92, 0xA8, 0xB4, 0xC6, 0x42, 0x28, 0x71
};
const u8 sks[] = {
0xD6, 0x4B, 0x7D, 0x72, 0x17, 0x59, 0x28, 0x05,
0xAF, 0xF9, 0xB7, 0xFF, 0x66, 0x6D, 0xA1, 0x96,
0x8F, 0x0B, 0x5E, 0x06, 0x46, 0x7A, 0x44, 0x84,
0x64, 0xC1, 0xC8, 0x0C, 0x96, 0x44, 0x09, 0x98,
0xFF, 0x92, 0xA8, 0xB4, 0xC6, 0x42, 0x28, 0x71
};
const u8 isk[] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
const u8 imck[] = {
0x16, 0x15, 0x3C, 0x3F, 0x21, 0x55, 0xEF, 0xD9,
0x7F, 0x34, 0xAE, 0xC8, 0x1A, 0x4E, 0x66, 0x80,
0x4C, 0xC3, 0x76, 0xF2, 0x8A, 0xA9, 0x6F, 0x96,
0xC2, 0x54, 0x5F, 0x8C, 0xAB, 0x65, 0x02, 0xE1,
0x18, 0x40, 0x7B, 0x56, 0xBE, 0xEA, 0xA7, 0xC5,
0x76, 0x5D, 0x8F, 0x0B, 0xC5, 0x07, 0xC6, 0xB9,
0x04, 0xD0, 0x69, 0x56, 0x72, 0x8B, 0x6B, 0xB8,
0x15, 0xEC, 0x57, 0x7B
};
const u8 msk[] = {
0x4D, 0x83, 0xA9, 0xBE, 0x6F, 0x8A, 0x74, 0xED,
0x6A, 0x02, 0x66, 0x0A, 0x63, 0x4D, 0x2C, 0x33,
0xC2, 0xDA, 0x60, 0x15, 0xC6, 0x37, 0x04, 0x51,
0x90, 0x38, 0x63, 0xDA, 0x54, 0x3E, 0x14, 0xB9,
0x27, 0x99, 0x18, 0x1E, 0x07, 0xBF, 0x0F, 0x5A,
0x5E, 0x3C, 0x32, 0x93, 0x80, 0x8C, 0x6C, 0x49,
0x67, 0xED, 0x24, 0xFE, 0x45, 0x40, 0xA0, 0x59,
0x5E, 0x37, 0xC2, 0xE9, 0xD0, 0x5D, 0x0A, 0xE3
};
const u8 emsk[] = {
0x3A, 0xD4, 0xAB, 0xDB, 0x76, 0xB2, 0x7F, 0x3B,
0xEA, 0x32, 0x2C, 0x2B, 0x74, 0xF4, 0x28, 0x55,
0xEF, 0x2D, 0xBA, 0x78, 0xC9, 0x57, 0x2F, 0x0D,
0x06, 0xCD, 0x51, 0x7C, 0x20, 0x93, 0x98, 0xA9,
0x76, 0xEA, 0x70, 0x21, 0xD7, 0x0E, 0x25, 0x54,
0x97, 0xED, 0xB2, 0x8A, 0xF6, 0xED, 0xFD, 0x0A,
0x2A, 0xE7, 0xA1, 0x58, 0x90, 0x10, 0x50, 0x44,
0xB3, 0x82, 0x85, 0xDB, 0x06, 0x14, 0xD2, 0xF9
};
/* RFC 4851, Appendix B.2 */
u8 tlv[] = {
0x80, 0x0C, 0x00, 0x38, 0x00, 0x01, 0x01, 0x00,
0xD8, 0x6A, 0x8C, 0x68, 0x3C, 0x32, 0x31, 0xA8,
0x56, 0x63, 0xB6, 0x40, 0x21, 0xFE, 0x21, 0x14,
0x4E, 0xE7, 0x54, 0x20, 0x79, 0x2D, 0x42, 0x62,
0xC9, 0xBF, 0x53, 0x7F, 0x54, 0xFD, 0xAC, 0x58,
0x43, 0x24, 0x6E, 0x30, 0x92, 0x17, 0x6D, 0xCF,
0xE6, 0xE0, 0x69, 0xEB, 0x33, 0x61, 0x6A, 0xCC,
0x05, 0xC5, 0x5B, 0xB7
};
const u8 compound_mac[] = {
0x43, 0x24, 0x6E, 0x30, 0x92, 0x17, 0x6D, 0xCF,
0xE6, 0xE0, 0x69, 0xEB, 0x33, 0x61, 0x6A, 0xCC,
0x05, 0xC5, 0x5B, 0xB7
};
u8 buf[512];
const u8 *simck, *cmk;
int errors = 0;
printf("EAP-FAST test cases\n");
printf("- T-PRF (SHA1) test case / master_secret\n");
sha1_t_prf(pac_key, sizeof(pac_key), "PAC to master secret label hash",
seed, sizeof(seed), buf, sizeof(master_secret));
if (memcmp(master_secret, buf, sizeof(master_secret)) != 0) {
printf("T-PRF test - FAILED!\n");
errors++;
}
printf("- PRF (TLS, SHA1/MD5) test case / key_block\n");
if (tls_prf(master_secret, sizeof(master_secret), "key expansion",
seed, sizeof(seed), buf, sizeof(key_block)) ||
memcmp(key_block, buf, sizeof(key_block)) != 0) {
printf("PRF test - FAILED!\n");
errors++;
}
printf("- T-PRF (SHA1) test case / IMCK\n");
sha1_t_prf(sks, sizeof(sks), "Inner Methods Compound Keys",
isk, sizeof(isk), buf, sizeof(imck));
if (memcmp(imck, buf, sizeof(imck)) != 0) {
printf("T-PRF test - FAILED!\n");
errors++;
}
simck = imck;
cmk = imck + 40;
printf("- T-PRF (SHA1) test case / MSK\n");
sha1_t_prf(simck, 40, "Session Key Generating Function",
(u8 *) "", 0, buf, sizeof(msk));
if (memcmp(msk, buf, sizeof(msk)) != 0) {
printf("T-PRF test - FAILED!\n");
errors++;
}
printf("- T-PRF (SHA1) test case / EMSK\n");
sha1_t_prf(simck, 40, "Extended Session Key Generating Function",
(u8 *) "", 0, buf, sizeof(msk));
if (memcmp(emsk, buf, sizeof(emsk)) != 0) {
printf("T-PRF test - FAILED!\n");
errors++;
}
printf("- Compound MAC test case\n");
memset(tlv + sizeof(tlv) - 20, 0, 20);
hmac_sha1(cmk, 20, tlv, sizeof(tlv), tlv + sizeof(tlv) - 20);
if (memcmp(tlv + sizeof(tlv) - 20, compound_mac, sizeof(compound_mac))
!= 0) {
printf("Compound MAC test - FAILED!\n");
errors++;
}
return errors;
}