libeap/src/eap_common/ikev2_common.c

   1 /*
   2  * IKEv2 common routines for initiator and responder
   3  * Copyright (c) 2007, 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/crypto.h"
  13 #include "crypto/md5.h"
  14 #include "crypto/sha1.h"
  15 #include "crypto/random.h"
  16 #include "ikev2_common.h"
  17
  18
  19 static const struct ikev2_integ_alg ikev2_integ_algs[] = {
  20         { AUTH_HMAC_SHA1_96, 20, 12 },
  21         { AUTH_HMAC_MD5_96, 16, 12 }
  22 };
  23
  24 #define NUM_INTEG_ALGS ARRAY_SIZE(ikev2_integ_algs)
  25
  26
  27 static const struct ikev2_prf_alg ikev2_prf_algs[] = {
  28         { PRF_HMAC_SHA1, 20, 20 },
  29         { PRF_HMAC_MD5, 16, 16 }
  30 };
  31
  32 #define NUM_PRF_ALGS ARRAY_SIZE(ikev2_prf_algs)
  33
  34
  35 static const struct ikev2_encr_alg ikev2_encr_algs[] = {
  36         { ENCR_AES_CBC, 16, 16 }, /* only 128-bit keys supported for now */
  37         { ENCR_3DES, 24, 8 }
  38 };
  39
  40 #define NUM_ENCR_ALGS ARRAY_SIZE(ikev2_encr_algs)
  41
  42
  43 const struct ikev2_integ_alg * ikev2_get_integ(int id)
  44 {
  45         size_t i;
  46
  47         for (i = 0; i < NUM_INTEG_ALGS; i++) {
  48                 if (ikev2_integ_algs[i].id == id)
  49                         return &ikev2_integ_algs[i];
  50         }
  51
  52         return NULL;
  53 }
  54
  55
  56 int ikev2_integ_hash(int alg, const u8 *key, size_t key_len, const u8 *data,
  57                      size_t data_len, u8 *hash)
  58 {
  59         u8 tmphash[IKEV2_MAX_HASH_LEN];
  60
  61         switch (alg) {
  62         case AUTH_HMAC_SHA1_96:
  63                 if (key_len != 20)
  64                         return -1;
  65                 hmac_sha1(key, key_len, data, data_len, tmphash);
  66                 os_memcpy(hash, tmphash, 12);
  67                 break;
  68         case AUTH_HMAC_MD5_96:
  69                 if (key_len != 16)
  70                         return -1;
  71                 hmac_md5(key, key_len, data, data_len, tmphash);
  72                 os_memcpy(hash, tmphash, 12);
  73                 break;
  74         default:
  75                 return -1;
  76         }
  77
  78         return 0;
  79 }
  80
  81
  82 const struct ikev2_prf_alg * ikev2_get_prf(int id)
  83 {
  84         size_t i;
  85
  86         for (i = 0; i < NUM_PRF_ALGS; i++) {
  87                 if (ikev2_prf_algs[i].id == id)
  88                         return &ikev2_prf_algs[i];
  89         }
  90
  91         return NULL;
  92 }
  93
  94
  95 int ikev2_prf_hash(int alg, const u8 *key, size_t key_len,
  96                    size_t num_elem, const u8 *addr[], const size_t *len,
  97                    u8 *hash)
  98 {
  99         switch (alg) {
 100         case PRF_HMAC_SHA1:
 101                 hmac_sha1_vector(key, key_len, num_elem, addr, len, hash);
 102                 break;
 103         case PRF_HMAC_MD5:
 104                 hmac_md5_vector(key, key_len, num_elem, addr, len, hash);
 105                 break;
 106         default:
 107                 return -1;
 108         }
 109
 110         return 0;
 111 }
 112
 113
 114 int ikev2_prf_plus(int alg, const u8 *key, size_t key_len,
 115                    const u8 *data, size_t data_len,
 116                    u8 *out, size_t out_len)
 117 {
 118         u8 hash[IKEV2_MAX_HASH_LEN];
 119         size_t hash_len;
 120         u8 iter, *pos, *end;
 121         const u8 *addr[3];
 122         size_t len[3];
 123         const struct ikev2_prf_alg *prf;
 124         int res;
 125
 126         prf = ikev2_get_prf(alg);
 127         if (prf == NULL)
 128                 return -1;
 129         hash_len = prf->hash_len;
 130
 131         addr[0] = hash;
 132         len[0] = hash_len;
 133         addr[1] = data;
 134         len[1] = data_len;
 135         addr[2] = &iter;
 136         len[2] = 1;
 137
 138         pos = out;
 139         end = out + out_len;
 140         iter = 1;
 141         while (pos < end) {
 142                 size_t clen;
 143                 if (iter == 1)
 144                         res = ikev2_prf_hash(alg, key, key_len, 2, &addr[1],
 145                                              &len[1], hash);
 146                 else
 147                         res = ikev2_prf_hash(alg, key, key_len, 3, addr, len,
 148                                              hash);
 149                 if (res < 0)
 150                         return -1;
 151                 clen = hash_len;
 152                 if ((int) clen > end - pos)
 153                         clen = end - pos;
 154                 os_memcpy(pos, hash, clen);
 155                 pos += clen;
 156                 iter++;
 157         }
 158
 159         return 0;
 160 }
 161
 162
 163 const struct ikev2_encr_alg * ikev2_get_encr(int id)
 164 {
 165         size_t i;
 166
 167         for (i = 0; i < NUM_ENCR_ALGS; i++) {
 168                 if (ikev2_encr_algs[i].id == id)
 169                         return &ikev2_encr_algs[i];
 170         }
 171
 172         return NULL;
 173 }
 174
 175
 176 int ikev2_encr_encrypt(int alg, const u8 *key, size_t key_len, const u8 *iv,
 177                        const u8 *plain, u8 *crypt, size_t len)
 178 {
 179         struct crypto_cipher *cipher;
 180         int encr_alg;
 181
 182         switch (alg) {
 183         case ENCR_3DES:
 184                 encr_alg = CRYPTO_CIPHER_ALG_3DES;
 185                 break;
 186         case ENCR_AES_CBC:
 187                 encr_alg = CRYPTO_CIPHER_ALG_AES;
 188                 break;
 189         default:
 190                 wpa_printf(MSG_DEBUG, "IKEV2: Unsupported encr alg %d", alg);
 191                 return -1;
 192         }
 193
 194         cipher = crypto_cipher_init(encr_alg, iv, key, key_len);
 195         if (cipher == NULL) {
 196                 wpa_printf(MSG_INFO, "IKEV2: Failed to initialize cipher");
 197                 return -1;
 198         }
 199
 200         if (crypto_cipher_encrypt(cipher, plain, crypt, len) < 0) {
 201                 wpa_printf(MSG_INFO, "IKEV2: Encryption failed");
 202                 crypto_cipher_deinit(cipher);
 203                 return -1;
 204         }
 205         crypto_cipher_deinit(cipher);
 206
 207         return 0;
 208 }
 209
 210
 211 int ikev2_encr_decrypt(int alg, const u8 *key, size_t key_len, const u8 *iv,
 212                        const u8 *crypt, u8 *plain, size_t len)
 213 {
 214         struct crypto_cipher *cipher;
 215         int encr_alg;
 216
 217         switch (alg) {
 218         case ENCR_3DES:
 219                 encr_alg = CRYPTO_CIPHER_ALG_3DES;
 220                 break;
 221         case ENCR_AES_CBC:
 222                 encr_alg = CRYPTO_CIPHER_ALG_AES;
 223                 break;
 224         default:
 225                 wpa_printf(MSG_DEBUG, "IKEV2: Unsupported encr alg %d", alg);
 226                 return -1;
 227         }
 228
 229         cipher = crypto_cipher_init(encr_alg, iv, key, key_len);
 230         if (cipher == NULL) {
 231                 wpa_printf(MSG_INFO, "IKEV2: Failed to initialize cipher");
 232                 return -1;
 233         }
 234
 235         if (crypto_cipher_decrypt(cipher, crypt, plain, len) < 0) {
 236                 wpa_printf(MSG_INFO, "IKEV2: Decryption failed");
 237                 crypto_cipher_deinit(cipher);
 238                 return -1;
 239         }
 240         crypto_cipher_deinit(cipher);
 241
 242         return 0;
 243 }
 244
 245
 246 int ikev2_parse_payloads(struct ikev2_payloads *payloads,
 247                          u8 next_payload, const u8 *pos, const u8 *end)
 248 {
 249         const struct ikev2_payload_hdr *phdr;
 250
 251         os_memset(payloads, 0, sizeof(*payloads));
 252
 253         while (next_payload != IKEV2_PAYLOAD_NO_NEXT_PAYLOAD) {
 254                 unsigned int plen, pdatalen, left;
 255                 const u8 *pdata;
 256                 wpa_printf(MSG_DEBUG, "IKEV2: Processing payload %u",
 257                            next_payload);
 258                 if (end < pos)
 259                         return -1;
 260                 left = end - pos;
 261                 if (left < sizeof(*phdr)) {
 262                         wpa_printf(MSG_INFO, "IKEV2:   Too short message for "
 263                                    "payload header (left=%ld)",
 264                                    (long) (end - pos));
 265                         return -1;
 266                 }
 267                 phdr = (const struct ikev2_payload_hdr *) pos;
 268                 plen = WPA_GET_BE16(phdr->payload_length);
 269                 if (plen < sizeof(*phdr) || plen > left) {
 270                         wpa_printf(MSG_INFO, "IKEV2:   Invalid payload header "
 271                                    "length %d", plen);
 272                         return -1;
 273                 }
 274
 275                 wpa_printf(MSG_DEBUG, "IKEV2:   Next Payload: %u  Flags: 0x%x"
 276                            "  Payload Length: %u",
 277                            phdr->next_payload, phdr->flags, plen);
 278
 279                 pdata = (const u8 *) (phdr + 1);
 280                 pdatalen = plen - sizeof(*phdr);
 281
 282                 switch (next_payload) {
 283                 case IKEV2_PAYLOAD_SA:
 284                         wpa_printf(MSG_DEBUG, "IKEV2:   Payload: Security "
 285                                    "Association");
 286                         payloads->sa = pdata;
 287                         payloads->sa_len = pdatalen;
 288                         break;
 289                 case IKEV2_PAYLOAD_KEY_EXCHANGE:
 290                         wpa_printf(MSG_DEBUG, "IKEV2:   Payload: Key "
 291                                    "Exchange");
 292                         payloads->ke = pdata;
 293                         payloads->ke_len = pdatalen;
 294                         break;
 295                 case IKEV2_PAYLOAD_IDi:
 296                         wpa_printf(MSG_DEBUG, "IKEV2:   Payload: IDi");
 297                         payloads->idi = pdata;
 298                         payloads->idi_len = pdatalen;
 299                         break;
 300                 case IKEV2_PAYLOAD_IDr:
 301                         wpa_printf(MSG_DEBUG, "IKEV2:   Payload: IDr");
 302                         payloads->idr = pdata;
 303                         payloads->idr_len = pdatalen;
 304                         break;
 305                 case IKEV2_PAYLOAD_CERTIFICATE:
 306                         wpa_printf(MSG_DEBUG, "IKEV2:   Payload: Certificate");
 307                         payloads->cert = pdata;
 308                         payloads->cert_len = pdatalen;
 309                         break;
 310                 case IKEV2_PAYLOAD_AUTHENTICATION:
 311                         wpa_printf(MSG_DEBUG, "IKEV2:   Payload: "
 312                                    "Authentication");
 313                         payloads->auth = pdata;
 314                         payloads->auth_len = pdatalen;
 315                         break;
 316                 case IKEV2_PAYLOAD_NONCE:
 317                         wpa_printf(MSG_DEBUG, "IKEV2:   Payload: Nonce");
 318                         payloads->nonce = pdata;
 319                         payloads->nonce_len = pdatalen;
 320                         break;
 321                 case IKEV2_PAYLOAD_ENCRYPTED:
 322                         wpa_printf(MSG_DEBUG, "IKEV2:   Payload: Encrypted");
 323                         payloads->encrypted = pdata;
 324                         payloads->encrypted_len = pdatalen;
 325                         break;
 326                 case IKEV2_PAYLOAD_NOTIFICATION:
 327                         wpa_printf(MSG_DEBUG, "IKEV2:   Payload: "
 328                                    "Notification");
 329                         payloads->notification = pdata;
 330                         payloads->notification_len = pdatalen;
 331                         break;
 332                 default:
 333                         if (phdr->flags & IKEV2_PAYLOAD_FLAGS_CRITICAL) {
 334                                 wpa_printf(MSG_INFO, "IKEV2:   Unsupported "
 335                                            "critical payload %u - reject the "
 336                                            "entire message", next_payload);
 337                                 return -1;
 338                         } else {
 339                                 wpa_printf(MSG_DEBUG, "IKEV2:   Skipped "
 340                                            "unsupported payload %u",
 341                                            next_payload);
 342                         }
 343                 }
 344
 345                 if (next_payload == IKEV2_PAYLOAD_ENCRYPTED &&
 346                     pos + plen == end) {
 347                         /*
 348                          * Next Payload in the case of Encrypted Payload is
 349                          * actually the payload type for the first embedded
 350                          * payload.
 351                          */
 352                         payloads->encr_next_payload = phdr->next_payload;
 353                         next_payload = IKEV2_PAYLOAD_NO_NEXT_PAYLOAD;
 354                 } else
 355                         next_payload = phdr->next_payload;
 356
 357                 pos += plen;
 358         }
 359
 360         if (pos != end) {
 361                 wpa_printf(MSG_INFO, "IKEV2: Unexpected extra data after "
 362                            "payloads");
 363                 return -1;
 364         }
 365
 366         return 0;
 367 }
 368
 369
 370 int ikev2_derive_auth_data(int prf_alg, const struct wpabuf *sign_msg,
 371                            const u8 *ID, size_t ID_len, u8 ID_type,
 372                            struct ikev2_keys *keys, int initiator,
 373                            const u8 *shared_secret, size_t shared_secret_len,
 374                            const u8 *nonce, size_t nonce_len,
 375                            const u8 *key_pad, size_t key_pad_len,
 376                            u8 *auth_data)
 377 {
 378         size_t sign_len, buf_len;
 379         u8 *sign_data, *pos, *buf, hash[IKEV2_MAX_HASH_LEN];
 380         const struct ikev2_prf_alg *prf;
 381         const u8 *SK_p = initiator ? keys->SK_pi : keys->SK_pr;
 382
 383         prf = ikev2_get_prf(prf_alg);
 384         if (sign_msg == NULL || ID == NULL || SK_p == NULL ||
 385             shared_secret == NULL || nonce == NULL || prf == NULL)
 386                 return -1;
 387
 388         /* prf(SK_pi/r,IDi/r') */
 389         buf_len = 4 + ID_len;
 390         buf = os_zalloc(buf_len);
 391         if (buf == NULL)
 392                 return -1;
 393         buf[0] = ID_type;
 394         os_memcpy(buf + 4, ID, ID_len);
 395         if (ikev2_prf_hash(prf->id, SK_p, keys->SK_prf_len,
 396                            1, (const u8 **) &buf, &buf_len, hash) < 0) {
 397                 os_free(buf);
 398                 return -1;
 399         }
 400         os_free(buf);
 401
 402         /* sign_data = msg | Nr/i | prf(SK_pi/r,IDi/r') */
 403         sign_len = wpabuf_len(sign_msg) + nonce_len + prf->hash_len;
 404         sign_data = os_malloc(sign_len);
 405         if (sign_data == NULL)
 406                 return -1;
 407         pos = sign_data;
 408         os_memcpy(pos, wpabuf_head(sign_msg), wpabuf_len(sign_msg));
 409         pos += wpabuf_len(sign_msg);
 410         os_memcpy(pos, nonce, nonce_len);
 411         pos += nonce_len;
 412         os_memcpy(pos, hash, prf->hash_len);
 413
 414         /* AUTH = prf(prf(Shared Secret, key pad, sign_data) */
 415         if (ikev2_prf_hash(prf->id, shared_secret, shared_secret_len, 1,
 416                            &key_pad, &key_pad_len, hash) < 0 ||
 417             ikev2_prf_hash(prf->id, hash, prf->hash_len, 1,
 418                            (const u8 **) &sign_data, &sign_len, auth_data) < 0)
 419         {
 420                 os_free(sign_data);
 421                 return -1;
 422         }
 423         os_free(sign_data);
 424
 425         return 0;
 426 }
 427
 428
 429 u8 * ikev2_decrypt_payload(int encr_id, int integ_id,
 430                            struct ikev2_keys *keys, int initiator,
 431                            const struct ikev2_hdr *hdr,
 432                            const u8 *encrypted, size_t encrypted_len,
 433                            size_t *res_len)
 434 {
 435         size_t iv_len;
 436         const u8 *pos, *end, *iv, *integ;
 437         u8 hash[IKEV2_MAX_HASH_LEN], *decrypted;
 438         size_t decrypted_len, pad_len;
 439         const struct ikev2_integ_alg *integ_alg;
 440         const struct ikev2_encr_alg *encr_alg;
 441         const u8 *SK_e = initiator ? keys->SK_ei : keys->SK_er;
 442         const u8 *SK_a = initiator ? keys->SK_ai : keys->SK_ar;
 443
 444         if (encrypted == NULL) {
 445                 wpa_printf(MSG_INFO, "IKEV2: No Encrypted payload in SA_AUTH");
 446                 return NULL;
 447         }
 448
 449         encr_alg = ikev2_get_encr(encr_id);
 450         if (encr_alg == NULL) {
 451                 wpa_printf(MSG_INFO, "IKEV2: Unsupported encryption type");
 452                 return NULL;
 453         }
 454         iv_len = encr_alg->block_size;
 455
 456         integ_alg = ikev2_get_integ(integ_id);
 457         if (integ_alg == NULL) {
 458                 wpa_printf(MSG_INFO, "IKEV2: Unsupported intergrity type");
 459                 return NULL;
 460         }
 461
 462         if (encrypted_len < iv_len + 1 + integ_alg->hash_len) {
 463                 wpa_printf(MSG_INFO, "IKEV2: No room for IV or Integrity "
 464                           "Checksum");
 465                 return NULL;
 466         }
 467
 468         iv = encrypted;
 469         pos = iv + iv_len;
 470         end = encrypted + encrypted_len;
 471         integ = end - integ_alg->hash_len;
 472
 473         if (SK_a == NULL) {
 474                 wpa_printf(MSG_INFO, "IKEV2: No SK_a available");
 475                 return NULL;
 476         }
 477         if (ikev2_integ_hash(integ_id, SK_a, keys->SK_integ_len,
 478                              (const u8 *) hdr,
 479                              integ - (const u8 *) hdr, hash) < 0) {
 480                 wpa_printf(MSG_INFO, "IKEV2: Failed to calculate integrity "
 481                            "hash");
 482                 return NULL;
 483         }
 484         if (os_memcmp_const(integ, hash, integ_alg->hash_len) != 0) {
 485                 wpa_printf(MSG_INFO, "IKEV2: Incorrect Integrity Checksum "
 486                            "Data");
 487                 return NULL;
 488         }
 489
 490         if (SK_e == NULL) {
 491                 wpa_printf(MSG_INFO, "IKEV2: No SK_e available");
 492                 return NULL;
 493         }
 494
 495         decrypted_len = integ - pos;
 496         decrypted = os_malloc(decrypted_len);
 497         if (decrypted == NULL)
 498                 return NULL;
 499
 500         if (ikev2_encr_decrypt(encr_alg->id, SK_e, keys->SK_encr_len, iv, pos,
 501                                decrypted, decrypted_len) < 0) {
 502                 os_free(decrypted);
 503                 return NULL;
 504         }
 505
 506         pad_len = decrypted[decrypted_len - 1];
 507         if (decrypted_len < pad_len + 1) {
 508                 wpa_printf(MSG_INFO, "IKEV2: Invalid padding in encrypted "
 509                            "payload");
 510                 os_free(decrypted);
 511                 return NULL;
 512         }
 513
 514         decrypted_len -= pad_len + 1;
 515
 516         *res_len = decrypted_len;
 517         return decrypted;
 518 }
 519
 520
 521 void ikev2_update_hdr(struct wpabuf *msg)
 522 {
 523         struct ikev2_hdr *hdr;
 524
 525         /* Update lenth field in HDR */
 526         hdr = wpabuf_mhead(msg);
 527         WPA_PUT_BE32(hdr->length, wpabuf_len(msg));
 528 }
 529
 530
 531 int ikev2_build_encrypted(int encr_id, int integ_id, struct ikev2_keys *keys,
 532                           int initiator, struct wpabuf *msg,
 533                           struct wpabuf *plain, u8 next_payload)
 534 {
 535         struct ikev2_payload_hdr *phdr;
 536         size_t plen;
 537         size_t iv_len, pad_len;
 538         u8 *icv, *iv;
 539         const struct ikev2_integ_alg *integ_alg;
 540         const struct ikev2_encr_alg *encr_alg;
 541         const u8 *SK_e = initiator ? keys->SK_ei : keys->SK_er;
 542         const u8 *SK_a = initiator ? keys->SK_ai : keys->SK_ar;
 543
 544         wpa_printf(MSG_DEBUG, "IKEV2: Adding Encrypted payload");
 545
 546         /* Encr - RFC 4306, Sect. 3.14 */
 547
 548         encr_alg = ikev2_get_encr(encr_id);
 549         if (encr_alg == NULL) {
 550                 wpa_printf(MSG_INFO, "IKEV2: Unsupported encryption type");
 551                 return -1;
 552         }
 553         iv_len = encr_alg->block_size;
 554
 555         integ_alg = ikev2_get_integ(integ_id);
 556         if (integ_alg == NULL) {
 557                 wpa_printf(MSG_INFO, "IKEV2: Unsupported intergrity type");
 558                 return -1;
 559         }
 560
 561         if (SK_e == NULL) {
 562                 wpa_printf(MSG_INFO, "IKEV2: No SK_e available");
 563                 return -1;
 564         }
 565
 566         if (SK_a == NULL) {
 567                 wpa_printf(MSG_INFO, "IKEV2: No SK_a available");
 568                 return -1;
 569         }
 570
 571         phdr = wpabuf_put(msg, sizeof(*phdr));
 572         phdr->next_payload = next_payload;
 573         phdr->flags = 0;
 574
 575         iv = wpabuf_put(msg, iv_len);
 576         if (random_get_bytes(iv, iv_len)) {
 577                 wpa_printf(MSG_INFO, "IKEV2: Could not generate IV");
 578                 return -1;
 579         }
 580
 581         pad_len = iv_len - (wpabuf_len(plain) + 1) % iv_len;
 582         if (pad_len == iv_len)
 583                 pad_len = 0;
 584         wpabuf_put(plain, pad_len);
 585         wpabuf_put_u8(plain, pad_len);
 586
 587         if (ikev2_encr_encrypt(encr_alg->id, SK_e, keys->SK_encr_len, iv,
 588                                wpabuf_head(plain), wpabuf_mhead(plain),
 589                                wpabuf_len(plain)) < 0)
 590                 return -1;
 591
 592         wpabuf_put_buf(msg, plain);
 593
 594         /* Need to update all headers (Length fields) prior to hash func */
 595         icv = wpabuf_put(msg, integ_alg->hash_len);
 596         plen = (u8 *) wpabuf_put(msg, 0) - (u8 *) phdr;
 597         WPA_PUT_BE16(phdr->payload_length, plen);
 598
 599         ikev2_update_hdr(msg);
 600
 601         return ikev2_integ_hash(integ_id, SK_a, keys->SK_integ_len,
 602                                 wpabuf_head(msg),
 603                                 wpabuf_len(msg) - integ_alg->hash_len, icv);
 604
 605         return 0;
 606 }
 607
 608
 609 int ikev2_keys_set(struct ikev2_keys *keys)
 610 {
 611         return keys->SK_d && keys->SK_ai && keys->SK_ar && keys->SK_ei &&
 612                 keys->SK_er && keys->SK_pi && keys->SK_pr;
 613 }
 614
 615
 616 void ikev2_free_keys(struct ikev2_keys *keys)
 617 {
 618         os_free(keys->SK_d);
 619         os_free(keys->SK_ai);
 620         os_free(keys->SK_ar);
 621         os_free(keys->SK_ei);
 622         os_free(keys->SK_er);
 623         os_free(keys->SK_pi);
 624         os_free(keys->SK_pr);
 625         keys->SK_d = keys->SK_ai = keys->SK_ar = keys->SK_ei = keys->SK_er =
 626                 keys->SK_pi = keys->SK_pr = NULL;
 627 }
 628
 629
 630 int ikev2_derive_sk_keys(const struct ikev2_prf_alg *prf,
 631                          const struct ikev2_integ_alg *integ,
 632                          const struct ikev2_encr_alg *encr,
 633                          const u8 *skeyseed, const u8 *data, size_t data_len,
 634                          struct ikev2_keys *keys)
 635 {
 636         u8 *keybuf, *pos;
 637         size_t keybuf_len;
 638
 639         /*
 640          * {SK_d | SK_ai | SK_ar | SK_ei | SK_er | SK_pi | SK_pr } =
 641          *      prf+(SKEYSEED, Ni | Nr | SPIi | SPIr )
 642          */
 643         ikev2_free_keys(keys);
 644         keys->SK_d_len = prf->key_len;
 645         keys->SK_integ_len = integ->key_len;
 646         keys->SK_encr_len = encr->key_len;
 647         keys->SK_prf_len = prf->key_len;
 648
 649         keybuf_len = keys->SK_d_len + 2 * keys->SK_integ_len +
 650                 2 * keys->SK_encr_len + 2 * keys->SK_prf_len;
 651         keybuf = os_malloc(keybuf_len);
 652         if (keybuf == NULL)
 653                 return -1;
 654
 655         if (ikev2_prf_plus(prf->id, skeyseed, prf->hash_len,
 656                            data, data_len, keybuf, keybuf_len)) {
 657                 os_free(keybuf);
 658                 return -1;
 659         }
 660
 661         pos = keybuf;
 662
 663         keys->SK_d = os_malloc(keys->SK_d_len);
 664         if (keys->SK_d) {
 665                 os_memcpy(keys->SK_d, pos, keys->SK_d_len);
 666                 wpa_hexdump_key(MSG_DEBUG, "IKEV2: SK_d",
 667                                 keys->SK_d, keys->SK_d_len);
 668         }
 669         pos += keys->SK_d_len;
 670
 671         keys->SK_ai = os_malloc(keys->SK_integ_len);
 672         if (keys->SK_ai) {
 673                 os_memcpy(keys->SK_ai, pos, keys->SK_integ_len);
 674                 wpa_hexdump_key(MSG_DEBUG, "IKEV2: SK_ai",
 675                                 keys->SK_ai, keys->SK_integ_len);
 676         }
 677         pos += keys->SK_integ_len;
 678
 679         keys->SK_ar = os_malloc(keys->SK_integ_len);
 680         if (keys->SK_ar) {
 681                 os_memcpy(keys->SK_ar, pos, keys->SK_integ_len);
 682                 wpa_hexdump_key(MSG_DEBUG, "IKEV2: SK_ar",
 683                                 keys->SK_ar, keys->SK_integ_len);
 684         }
 685         pos += keys->SK_integ_len;
 686
 687         keys->SK_ei = os_malloc(keys->SK_encr_len);
 688         if (keys->SK_ei) {
 689                 os_memcpy(keys->SK_ei, pos, keys->SK_encr_len);
 690                 wpa_hexdump_key(MSG_DEBUG, "IKEV2: SK_ei",
 691                                 keys->SK_ei, keys->SK_encr_len);
 692         }
 693         pos += keys->SK_encr_len;
 694
 695         keys->SK_er = os_malloc(keys->SK_encr_len);
 696         if (keys->SK_er) {
 697                 os_memcpy(keys->SK_er, pos, keys->SK_encr_len);
 698                 wpa_hexdump_key(MSG_DEBUG, "IKEV2: SK_er",
 699                                 keys->SK_er, keys->SK_encr_len);
 700         }
 701         pos += keys->SK_encr_len;
 702
 703         keys->SK_pi = os_malloc(keys->SK_prf_len);
 704         if (keys->SK_pi) {
 705                 os_memcpy(keys->SK_pi, pos, keys->SK_prf_len);
 706                 wpa_hexdump_key(MSG_DEBUG, "IKEV2: SK_pi",
 707                                 keys->SK_pi, keys->SK_prf_len);
 708         }
 709         pos += keys->SK_prf_len;
 710
 711         keys->SK_pr = os_malloc(keys->SK_prf_len);
 712         if (keys->SK_pr) {
 713                 os_memcpy(keys->SK_pr, pos, keys->SK_prf_len);
 714                 wpa_hexdump_key(MSG_DEBUG, "IKEV2: SK_pr",
 715                                 keys->SK_pr, keys->SK_prf_len);
 716         }
 717
 718         os_free(keybuf);
 719
 720         if (!ikev2_keys_set(keys)) {
 721                 ikev2_free_keys(keys);
 722                 return -1;
 723         }
 724
 725         return 0;
 726 }