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 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 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 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;
 255                 const u8 *pdata;
 256                 wpa_printf(MSG_DEBUG, "IKEV2: Processing payload %u",
 257                            next_payload);
 258                 if (end - pos < (int) sizeof(*phdr)) {
 259                         wpa_printf(MSG_INFO, "IKEV2:   Too short message for "
 260                                    "payload header (left=%ld)",
 261                                    (long) (end - pos));
 262                         return -1;
 263                 }
 264                 phdr = (const struct ikev2_payload_hdr *) pos;
 265                 plen = WPA_GET_BE16(phdr->payload_length);
 266                 if (plen < sizeof(*phdr) || pos + plen > end) {
 267                         wpa_printf(MSG_INFO, "IKEV2:   Invalid payload header "
 268                                    "length %d", plen);
 269                         return -1;
 270                 }
 271
 272                 wpa_printf(MSG_DEBUG, "IKEV2:   Next Payload: %u  Flags: 0x%x"
 273                            "  Payload Length: %u",
 274                            phdr->next_payload, phdr->flags, plen);
 275
 276                 pdata = (const u8 *) (phdr + 1);
 277                 pdatalen = plen - sizeof(*phdr);
 278
 279                 switch (next_payload) {
 280                 case IKEV2_PAYLOAD_SA:
 281                         wpa_printf(MSG_DEBUG, "IKEV2:   Payload: Security "
 282                                    "Association");
 283                         payloads->sa = pdata;
 284                         payloads->sa_len = pdatalen;
 285                         break;
 286                 case IKEV2_PAYLOAD_KEY_EXCHANGE:
 287                         wpa_printf(MSG_DEBUG, "IKEV2:   Payload: Key "
 288                                    "Exchange");
 289                         payloads->ke = pdata;
 290                         payloads->ke_len = pdatalen;
 291                         break;
 292                 case IKEV2_PAYLOAD_IDi:
 293                         wpa_printf(MSG_DEBUG, "IKEV2:   Payload: IDi");
 294                         payloads->idi = pdata;
 295                         payloads->idi_len = pdatalen;
 296                         break;
 297                 case IKEV2_PAYLOAD_IDr:
 298                         wpa_printf(MSG_DEBUG, "IKEV2:   Payload: IDr");
 299                         payloads->idr = pdata;
 300                         payloads->idr_len = pdatalen;
 301                         break;
 302                 case IKEV2_PAYLOAD_CERTIFICATE:
 303                         wpa_printf(MSG_DEBUG, "IKEV2:   Payload: Certificate");
 304                         payloads->cert = pdata;
 305                         payloads->cert_len = pdatalen;
 306                         break;
 307                 case IKEV2_PAYLOAD_AUTHENTICATION:
 308                         wpa_printf(MSG_DEBUG, "IKEV2:   Payload: "
 309                                    "Authentication");
 310                         payloads->auth = pdata;
 311                         payloads->auth_len = pdatalen;
 312                         break;
 313                 case IKEV2_PAYLOAD_NONCE:
 314                         wpa_printf(MSG_DEBUG, "IKEV2:   Payload: Nonce");
 315                         payloads->nonce = pdata;
 316                         payloads->nonce_len = pdatalen;
 317                         break;
 318                 case IKEV2_PAYLOAD_ENCRYPTED:
 319                         wpa_printf(MSG_DEBUG, "IKEV2:   Payload: Encrypted");
 320                         payloads->encrypted = pdata;
 321                         payloads->encrypted_len = pdatalen;
 322                         break;
 323                 case IKEV2_PAYLOAD_NOTIFICATION:
 324                         wpa_printf(MSG_DEBUG, "IKEV2:   Payload: "
 325                                    "Notification");
 326                         payloads->notification = pdata;
 327                         payloads->notification_len = pdatalen;
 328                         break;
 329                 default:
 330                         if (phdr->flags & IKEV2_PAYLOAD_FLAGS_CRITICAL) {
 331                                 wpa_printf(MSG_INFO, "IKEV2:   Unsupported "
 332                                            "critical payload %u - reject the "
 333                                            "entire message", next_payload);
 334                                 return -1;
 335                         } else {
 336                                 wpa_printf(MSG_DEBUG, "IKEV2:   Skipped "
 337                                            "unsupported payload %u",
 338                                            next_payload);
 339                         }
 340                 }
 341
 342                 if (next_payload == IKEV2_PAYLOAD_ENCRYPTED &&
 343                     pos + plen == end) {
 344                         /*
 345                          * Next Payload in the case of Encrypted Payload is
 346                          * actually the payload type for the first embedded
 347                          * payload.
 348                          */
 349                         payloads->encr_next_payload = phdr->next_payload;
 350                         next_payload = IKEV2_PAYLOAD_NO_NEXT_PAYLOAD;
 351                 } else
 352                         next_payload = phdr->next_payload;
 353
 354                 pos += plen;
 355         }
 356
 357         if (pos != end) {
 358                 wpa_printf(MSG_INFO, "IKEV2: Unexpected extra data after "
 359                            "payloads");
 360                 return -1;
 361         }
 362
 363         return 0;
 364 }
 365
 366
 367 int ikev2_derive_auth_data(int prf_alg, const struct wpabuf *sign_msg,
 368                            const u8 *ID, size_t ID_len, u8 ID_type,
 369                            struct ikev2_keys *keys, int initiator,
 370                            const u8 *shared_secret, size_t shared_secret_len,
 371                            const u8 *nonce, size_t nonce_len,
 372                            const u8 *key_pad, size_t key_pad_len,
 373                            u8 *auth_data)
 374 {
 375         size_t sign_len, buf_len;
 376         u8 *sign_data, *pos, *buf, hash[IKEV2_MAX_HASH_LEN];
 377         const struct ikev2_prf_alg *prf;
 378         const u8 *SK_p = initiator ? keys->SK_pi : keys->SK_pr;
 379
 380         prf = ikev2_get_prf(prf_alg);
 381         if (sign_msg == NULL || ID == NULL || SK_p == NULL ||
 382             shared_secret == NULL || nonce == NULL || prf == NULL)
 383                 return -1;
 384
 385         /* prf(SK_pi/r,IDi/r') */
 386         buf_len = 4 + ID_len;
 387         buf = os_zalloc(buf_len);
 388         if (buf == NULL)
 389                 return -1;
 390         buf[0] = ID_type;
 391         os_memcpy(buf + 4, ID, ID_len);
 392         if (ikev2_prf_hash(prf->id, SK_p, keys->SK_prf_len,
 393                            1, (const u8 **) &buf, &buf_len, hash) < 0) {
 394                 os_free(buf);
 395                 return -1;
 396         }
 397         os_free(buf);
 398
 399         /* sign_data = msg | Nr/i | prf(SK_pi/r,IDi/r') */
 400         sign_len = wpabuf_len(sign_msg) + nonce_len + prf->hash_len;
 401         sign_data = os_malloc(sign_len);
 402         if (sign_data == NULL)
 403                 return -1;
 404         pos = sign_data;
 405         os_memcpy(pos, wpabuf_head(sign_msg), wpabuf_len(sign_msg));
 406         pos += wpabuf_len(sign_msg);
 407         os_memcpy(pos, nonce, nonce_len);
 408         pos += nonce_len;
 409         os_memcpy(pos, hash, prf->hash_len);
 410
 411         /* AUTH = prf(prf(Shared Secret, key pad, sign_data) */
 412         if (ikev2_prf_hash(prf->id, shared_secret, shared_secret_len, 1,
 413                            &key_pad, &key_pad_len, hash) < 0 ||
 414             ikev2_prf_hash(prf->id, hash, prf->hash_len, 1,
 415                            (const u8 **) &sign_data, &sign_len, auth_data) < 0)
 416         {
 417                 os_free(sign_data);
 418                 return -1;
 419         }
 420         os_free(sign_data);
 421
 422         return 0;
 423 }
 424
 425
 426 u8 * ikev2_decrypt_payload(int encr_id, int integ_id,
 427                            struct ikev2_keys *keys, int initiator,
 428                            const struct ikev2_hdr *hdr,
 429                            const u8 *encrypted, size_t encrypted_len,
 430                            size_t *res_len)
 431 {
 432         size_t iv_len;
 433         const u8 *pos, *end, *iv, *integ;
 434         u8 hash[IKEV2_MAX_HASH_LEN], *decrypted;
 435         size_t decrypted_len, pad_len;
 436         const struct ikev2_integ_alg *integ_alg;
 437         const struct ikev2_encr_alg *encr_alg;
 438         const u8 *SK_e = initiator ? keys->SK_ei : keys->SK_er;
 439         const u8 *SK_a = initiator ? keys->SK_ai : keys->SK_ar;
 440
 441         if (encrypted == NULL) {
 442                 wpa_printf(MSG_INFO, "IKEV2: No Encrypted payload in SA_AUTH");
 443                 return NULL;
 444         }
 445
 446         encr_alg = ikev2_get_encr(encr_id);
 447         if (encr_alg == NULL) {
 448                 wpa_printf(MSG_INFO, "IKEV2: Unsupported encryption type");
 449                 return NULL;
 450         }
 451         iv_len = encr_alg->block_size;
 452
 453         integ_alg = ikev2_get_integ(integ_id);
 454         if (integ_alg == NULL) {
 455                 wpa_printf(MSG_INFO, "IKEV2: Unsupported intergrity type");
 456                 return NULL;
 457         }
 458
 459         if (encrypted_len < iv_len + 1 + integ_alg->hash_len) {
 460                 wpa_printf(MSG_INFO, "IKEV2: No room for IV or Integrity "
 461                           "Checksum");
 462                 return NULL;
 463         }
 464
 465         iv = encrypted;
 466         pos = iv + iv_len;
 467         end = encrypted + encrypted_len;
 468         integ = end - integ_alg->hash_len;
 469
 470         if (SK_a == NULL) {
 471                 wpa_printf(MSG_INFO, "IKEV2: No SK_a available");
 472                 return NULL;
 473         }
 474         if (ikev2_integ_hash(integ_id, SK_a, keys->SK_integ_len,
 475                              (const u8 *) hdr,
 476                              integ - (const u8 *) hdr, hash) < 0) {
 477                 wpa_printf(MSG_INFO, "IKEV2: Failed to calculate integrity "
 478                            "hash");
 479                 return NULL;
 480         }
 481         if (os_memcmp_const(integ, hash, integ_alg->hash_len) != 0) {
 482                 wpa_printf(MSG_INFO, "IKEV2: Incorrect Integrity Checksum "
 483                            "Data");
 484                 return NULL;
 485         }
 486
 487         if (SK_e == NULL) {
 488                 wpa_printf(MSG_INFO, "IKEV2: No SK_e available");
 489                 return NULL;
 490         }
 491
 492         decrypted_len = integ - pos;
 493         decrypted = os_malloc(decrypted_len);
 494         if (decrypted == NULL)
 495                 return NULL;
 496
 497         if (ikev2_encr_decrypt(encr_alg->id, SK_e, keys->SK_encr_len, iv, pos,
 498                                decrypted, decrypted_len) < 0) {
 499                 os_free(decrypted);
 500                 return NULL;
 501         }
 502
 503         pad_len = decrypted[decrypted_len - 1];
 504         if (decrypted_len < pad_len + 1) {
 505                 wpa_printf(MSG_INFO, "IKEV2: Invalid padding in encrypted "
 506                            "payload");
 507                 os_free(decrypted);
 508                 return NULL;
 509         }
 510
 511         decrypted_len -= pad_len + 1;
 512
 513         *res_len = decrypted_len;
 514         return decrypted;
 515 }
 516
 517
 518 void ikev2_update_hdr(struct wpabuf *msg)
 519 {
 520         struct ikev2_hdr *hdr;
 521
 522         /* Update lenth field in HDR */
 523         hdr = wpabuf_mhead(msg);
 524         WPA_PUT_BE32(hdr->length, wpabuf_len(msg));
 525 }
 526
 527
 528 int ikev2_build_encrypted(int encr_id, int integ_id, struct ikev2_keys *keys,
 529                           int initiator, struct wpabuf *msg,
 530                           struct wpabuf *plain, u8 next_payload)
 531 {
 532         struct ikev2_payload_hdr *phdr;
 533         size_t plen;
 534         size_t iv_len, pad_len;
 535         u8 *icv, *iv;
 536         const struct ikev2_integ_alg *integ_alg;
 537         const struct ikev2_encr_alg *encr_alg;
 538         const u8 *SK_e = initiator ? keys->SK_ei : keys->SK_er;
 539         const u8 *SK_a = initiator ? keys->SK_ai : keys->SK_ar;
 540
 541         wpa_printf(MSG_DEBUG, "IKEV2: Adding Encrypted payload");
 542
 543         /* Encr - RFC 4306, Sect. 3.14 */
 544
 545         encr_alg = ikev2_get_encr(encr_id);
 546         if (encr_alg == NULL) {
 547                 wpa_printf(MSG_INFO, "IKEV2: Unsupported encryption type");
 548                 return -1;
 549         }
 550         iv_len = encr_alg->block_size;
 551
 552         integ_alg = ikev2_get_integ(integ_id);
 553         if (integ_alg == NULL) {
 554                 wpa_printf(MSG_INFO, "IKEV2: Unsupported intergrity type");
 555                 return -1;
 556         }
 557
 558         if (SK_e == NULL) {
 559                 wpa_printf(MSG_INFO, "IKEV2: No SK_e available");
 560                 return -1;
 561         }
 562
 563         if (SK_a == NULL) {
 564                 wpa_printf(MSG_INFO, "IKEV2: No SK_a available");
 565                 return -1;
 566         }
 567
 568         phdr = wpabuf_put(msg, sizeof(*phdr));
 569         phdr->next_payload = next_payload;
 570         phdr->flags = 0;
 571
 572         iv = wpabuf_put(msg, iv_len);
 573         if (random_get_bytes(iv, iv_len)) {
 574                 wpa_printf(MSG_INFO, "IKEV2: Could not generate IV");
 575                 return -1;
 576         }
 577
 578         pad_len = iv_len - (wpabuf_len(plain) + 1) % iv_len;
 579         if (pad_len == iv_len)
 580                 pad_len = 0;
 581         wpabuf_put(plain, pad_len);
 582         wpabuf_put_u8(plain, pad_len);
 583
 584         if (ikev2_encr_encrypt(encr_alg->id, SK_e, keys->SK_encr_len, iv,
 585                                wpabuf_head(plain), wpabuf_mhead(plain),
 586                                wpabuf_len(plain)) < 0)
 587                 return -1;
 588
 589         wpabuf_put_buf(msg, plain);
 590
 591         /* Need to update all headers (Length fields) prior to hash func */
 592         icv = wpabuf_put(msg, integ_alg->hash_len);
 593         plen = (u8 *) wpabuf_put(msg, 0) - (u8 *) phdr;
 594         WPA_PUT_BE16(phdr->payload_length, plen);
 595
 596         ikev2_update_hdr(msg);
 597
 598         return ikev2_integ_hash(integ_id, SK_a, keys->SK_integ_len,
 599                                 wpabuf_head(msg),
 600                                 wpabuf_len(msg) - integ_alg->hash_len, icv);
 601
 602         return 0;
 603 }
 604
 605
 606 int ikev2_keys_set(struct ikev2_keys *keys)
 607 {
 608         return keys->SK_d && keys->SK_ai && keys->SK_ar && keys->SK_ei &&
 609                 keys->SK_er && keys->SK_pi && keys->SK_pr;
 610 }
 611
 612
 613 void ikev2_free_keys(struct ikev2_keys *keys)
 614 {
 615         os_free(keys->SK_d);
 616         os_free(keys->SK_ai);
 617         os_free(keys->SK_ar);
 618         os_free(keys->SK_ei);
 619         os_free(keys->SK_er);
 620         os_free(keys->SK_pi);
 621         os_free(keys->SK_pr);
 622         keys->SK_d = keys->SK_ai = keys->SK_ar = keys->SK_ei = keys->SK_er =
 623                 keys->SK_pi = keys->SK_pr = NULL;
 624 }
 625
 626
 627 int ikev2_derive_sk_keys(const struct ikev2_prf_alg *prf,
 628                          const struct ikev2_integ_alg *integ,
 629                          const struct ikev2_encr_alg *encr,
 630                          const u8 *skeyseed, const u8 *data, size_t data_len,
 631                          struct ikev2_keys *keys)
 632 {
 633         u8 *keybuf, *pos;
 634         size_t keybuf_len;
 635
 636         /*
 637          * {SK_d | SK_ai | SK_ar | SK_ei | SK_er | SK_pi | SK_pr } =
 638          *      prf+(SKEYSEED, Ni | Nr | SPIi | SPIr )
 639          */
 640         ikev2_free_keys(keys);
 641         keys->SK_d_len = prf->key_len;
 642         keys->SK_integ_len = integ->key_len;
 643         keys->SK_encr_len = encr->key_len;
 644         keys->SK_prf_len = prf->key_len;
 645
 646         keybuf_len = keys->SK_d_len + 2 * keys->SK_integ_len +
 647                 2 * keys->SK_encr_len + 2 * keys->SK_prf_len;
 648         keybuf = os_malloc(keybuf_len);
 649         if (keybuf == NULL)
 650                 return -1;
 651
 652         if (ikev2_prf_plus(prf->id, skeyseed, prf->hash_len,
 653                            data, data_len, keybuf, keybuf_len)) {
 654                 os_free(keybuf);
 655                 return -1;
 656         }
 657
 658         pos = keybuf;
 659
 660         keys->SK_d = os_malloc(keys->SK_d_len);
 661         if (keys->SK_d) {
 662                 os_memcpy(keys->SK_d, pos, keys->SK_d_len);
 663                 wpa_hexdump_key(MSG_DEBUG, "IKEV2: SK_d",
 664                                 keys->SK_d, keys->SK_d_len);
 665         }
 666         pos += keys->SK_d_len;
 667
 668         keys->SK_ai = os_malloc(keys->SK_integ_len);
 669         if (keys->SK_ai) {
 670                 os_memcpy(keys->SK_ai, pos, keys->SK_integ_len);
 671                 wpa_hexdump_key(MSG_DEBUG, "IKEV2: SK_ai",
 672                                 keys->SK_ai, keys->SK_integ_len);
 673         }
 674         pos += keys->SK_integ_len;
 675
 676         keys->SK_ar = os_malloc(keys->SK_integ_len);
 677         if (keys->SK_ar) {
 678                 os_memcpy(keys->SK_ar, pos, keys->SK_integ_len);
 679                 wpa_hexdump_key(MSG_DEBUG, "IKEV2: SK_ar",
 680                                 keys->SK_ar, keys->SK_integ_len);
 681         }
 682         pos += keys->SK_integ_len;
 683
 684         keys->SK_ei = os_malloc(keys->SK_encr_len);
 685         if (keys->SK_ei) {
 686                 os_memcpy(keys->SK_ei, pos, keys->SK_encr_len);
 687                 wpa_hexdump_key(MSG_DEBUG, "IKEV2: SK_ei",
 688                                 keys->SK_ei, keys->SK_encr_len);
 689         }
 690         pos += keys->SK_encr_len;
 691
 692         keys->SK_er = os_malloc(keys->SK_encr_len);
 693         if (keys->SK_er) {
 694                 os_memcpy(keys->SK_er, pos, keys->SK_encr_len);
 695                 wpa_hexdump_key(MSG_DEBUG, "IKEV2: SK_er",
 696                                 keys->SK_er, keys->SK_encr_len);
 697         }
 698         pos += keys->SK_encr_len;
 699
 700         keys->SK_pi = os_malloc(keys->SK_prf_len);
 701         if (keys->SK_pi) {
 702                 os_memcpy(keys->SK_pi, pos, keys->SK_prf_len);
 703                 wpa_hexdump_key(MSG_DEBUG, "IKEV2: SK_pi",
 704                                 keys->SK_pi, keys->SK_prf_len);
 705         }
 706         pos += keys->SK_prf_len;
 707
 708         keys->SK_pr = os_malloc(keys->SK_prf_len);
 709         if (keys->SK_pr) {
 710                 os_memcpy(keys->SK_pr, pos, keys->SK_prf_len);
 711                 wpa_hexdump_key(MSG_DEBUG, "IKEV2: SK_pr",
 712                                 keys->SK_pr, keys->SK_prf_len);
 713         }
 714
 715         os_free(keybuf);
 716
 717         if (!ikev2_keys_set(keys)) {
 718                 ikev2_free_keys(keys);
 719                 return -1;
 720         }
 721
 722         return 0;
 723 }