1 /* 2 * Copyright 2005-2018 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the OpenSSL license (the "License"). You may not use 5 * this file except in compliance with the License. You can obtain a copy 6 * in the file LICENSE in the source distribution or at 7 * https://www.openssl.org/source/license.html 8 */ 9 10 /* 11 * Support for PVK format keys and related structures (such a PUBLICKEYBLOB 12 * and PRIVATEKEYBLOB). 13 */ 14 15 #include "internal/cryptlib.h" 16 #include <openssl/pem.h> 17 #include <openssl/rand.h> 18 #include <openssl/bn.h> 19 #if !defined(OPENSSL_NO_RSA) && !defined(OPENSSL_NO_DSA) 20 # include <openssl/dsa.h> 21 # include <openssl/rsa.h> 22 23 /* 24 * Utility function: read a DWORD (4 byte unsigned integer) in little endian 25 * format 26 */ 27 28 static unsigned int read_ledword(const unsigned char **in) 29 { 30 const unsigned char *p = *in; 31 unsigned int ret; 32 ret = *p++; 33 ret |= (*p++ << 8); 34 ret |= (*p++ << 16); 35 ret |= (*p++ << 24); 36 *in = p; 37 return ret; 38 } 39 40 /* 41 * Read a BIGNUM in little endian format. The docs say that this should take 42 * up bitlen/8 bytes. 43 */ 44 45 static int read_lebn(const unsigned char **in, unsigned int nbyte, BIGNUM **r) 46 { 47 *r = BN_lebin2bn(*in, nbyte, NULL); 48 if (*r == NULL) 49 return 0; 50 *in += nbyte; 51 return 1; 52 } 53 54 /* Convert private key blob to EVP_PKEY: RSA and DSA keys supported */ 55 56 # define MS_PUBLICKEYBLOB 0x6 57 # define MS_PRIVATEKEYBLOB 0x7 58 # define MS_RSA1MAGIC 0x31415352L 59 # define MS_RSA2MAGIC 0x32415352L 60 # define MS_DSS1MAGIC 0x31535344L 61 # define MS_DSS2MAGIC 0x32535344L 62 63 # define MS_KEYALG_RSA_KEYX 0xa400 64 # define MS_KEYALG_DSS_SIGN 0x2200 65 66 # define MS_KEYTYPE_KEYX 0x1 67 # define MS_KEYTYPE_SIGN 0x2 68 69 /* Maximum length of a blob after header */ 70 # define BLOB_MAX_LENGTH 102400 71 72 /* The PVK file magic number: seems to spell out "bobsfile", who is Bob? */ 73 # define MS_PVKMAGIC 0xb0b5f11eL 74 /* Salt length for PVK files */ 75 # define PVK_SALTLEN 0x10 76 /* Maximum length in PVK header */ 77 # define PVK_MAX_KEYLEN 102400 78 /* Maximum salt length */ 79 # define PVK_MAX_SALTLEN 10240 80 81 static EVP_PKEY *b2i_rsa(const unsigned char **in, 82 unsigned int bitlen, int ispub); 83 static EVP_PKEY *b2i_dss(const unsigned char **in, 84 unsigned int bitlen, int ispub); 85 86 static int do_blob_header(const unsigned char **in, unsigned int length, 87 unsigned int *pmagic, unsigned int *pbitlen, 88 int *pisdss, int *pispub) 89 { 90 const unsigned char *p = *in; 91 if (length < 16) 92 return 0; 93 /* bType */ 94 if (*p == MS_PUBLICKEYBLOB) { 95 if (*pispub == 0) { 96 PEMerr(PEM_F_DO_BLOB_HEADER, PEM_R_EXPECTING_PRIVATE_KEY_BLOB); 97 return 0; 98 } 99 *pispub = 1; 100 } else if (*p == MS_PRIVATEKEYBLOB) { 101 if (*pispub == 1) { 102 PEMerr(PEM_F_DO_BLOB_HEADER, PEM_R_EXPECTING_PUBLIC_KEY_BLOB); 103 return 0; 104 } 105 *pispub = 0; 106 } else 107 return 0; 108 p++; 109 /* Version */ 110 if (*p++ != 0x2) { 111 PEMerr(PEM_F_DO_BLOB_HEADER, PEM_R_BAD_VERSION_NUMBER); 112 return 0; 113 } 114 /* Ignore reserved, aiKeyAlg */ 115 p += 6; 116 *pmagic = read_ledword(&p); 117 *pbitlen = read_ledword(&p); 118 *pisdss = 0; 119 switch (*pmagic) { 120 121 case MS_DSS1MAGIC: 122 *pisdss = 1; 123 /* fall thru */ 124 case MS_RSA1MAGIC: 125 if (*pispub == 0) { 126 PEMerr(PEM_F_DO_BLOB_HEADER, PEM_R_EXPECTING_PRIVATE_KEY_BLOB); 127 return 0; 128 } 129 break; 130 131 case MS_DSS2MAGIC: 132 *pisdss = 1; 133 /* fall thru */ 134 case MS_RSA2MAGIC: 135 if (*pispub == 1) { 136 PEMerr(PEM_F_DO_BLOB_HEADER, PEM_R_EXPECTING_PUBLIC_KEY_BLOB); 137 return 0; 138 } 139 break; 140 141 default: 142 PEMerr(PEM_F_DO_BLOB_HEADER, PEM_R_BAD_MAGIC_NUMBER); 143 return -1; 144 } 145 *in = p; 146 return 1; 147 } 148 149 static unsigned int blob_length(unsigned bitlen, int isdss, int ispub) 150 { 151 unsigned int nbyte, hnbyte; 152 nbyte = (bitlen + 7) >> 3; 153 hnbyte = (bitlen + 15) >> 4; 154 if (isdss) { 155 156 /* 157 * Expected length: 20 for q + 3 components bitlen each + 24 for seed 158 * structure. 159 */ 160 if (ispub) 161 return 44 + 3 * nbyte; 162 /* 163 * Expected length: 20 for q, priv, 2 bitlen components + 24 for seed 164 * structure. 165 */ 166 else 167 return 64 + 2 * nbyte; 168 } else { 169 /* Expected length: 4 for 'e' + 'n' */ 170 if (ispub) 171 return 4 + nbyte; 172 else 173 /* 174 * Expected length: 4 for 'e' and 7 other components. 2 175 * components are bitlen size, 5 are bitlen/2 176 */ 177 return 4 + 2 * nbyte + 5 * hnbyte; 178 } 179 180 } 181 182 static EVP_PKEY *do_b2i(const unsigned char **in, unsigned int length, 183 int ispub) 184 { 185 const unsigned char *p = *in; 186 unsigned int bitlen, magic; 187 int isdss; 188 if (do_blob_header(&p, length, &magic, &bitlen, &isdss, &ispub) <= 0) { 189 PEMerr(PEM_F_DO_B2I, PEM_R_KEYBLOB_HEADER_PARSE_ERROR); 190 return NULL; 191 } 192 length -= 16; 193 if (length < blob_length(bitlen, isdss, ispub)) { 194 PEMerr(PEM_F_DO_B2I, PEM_R_KEYBLOB_TOO_SHORT); 195 return NULL; 196 } 197 if (isdss) 198 return b2i_dss(&p, bitlen, ispub); 199 else 200 return b2i_rsa(&p, bitlen, ispub); 201 } 202 203 static EVP_PKEY *do_b2i_bio(BIO *in, int ispub) 204 { 205 const unsigned char *p; 206 unsigned char hdr_buf[16], *buf = NULL; 207 unsigned int bitlen, magic, length; 208 int isdss; 209 EVP_PKEY *ret = NULL; 210 if (BIO_read(in, hdr_buf, 16) != 16) { 211 PEMerr(PEM_F_DO_B2I_BIO, PEM_R_KEYBLOB_TOO_SHORT); 212 return NULL; 213 } 214 p = hdr_buf; 215 if (do_blob_header(&p, 16, &magic, &bitlen, &isdss, &ispub) <= 0) 216 return NULL; 217 218 length = blob_length(bitlen, isdss, ispub); 219 if (length > BLOB_MAX_LENGTH) { 220 PEMerr(PEM_F_DO_B2I_BIO, PEM_R_HEADER_TOO_LONG); 221 return NULL; 222 } 223 buf = OPENSSL_malloc(length); 224 if (buf == NULL) { 225 PEMerr(PEM_F_DO_B2I_BIO, ERR_R_MALLOC_FAILURE); 226 goto err; 227 } 228 p = buf; 229 if (BIO_read(in, buf, length) != (int)length) { 230 PEMerr(PEM_F_DO_B2I_BIO, PEM_R_KEYBLOB_TOO_SHORT); 231 goto err; 232 } 233 234 if (isdss) 235 ret = b2i_dss(&p, bitlen, ispub); 236 else 237 ret = b2i_rsa(&p, bitlen, ispub); 238 239 err: 240 OPENSSL_free(buf); 241 return ret; 242 } 243 244 static EVP_PKEY *b2i_dss(const unsigned char **in, 245 unsigned int bitlen, int ispub) 246 { 247 const unsigned char *p = *in; 248 EVP_PKEY *ret = NULL; 249 DSA *dsa = NULL; 250 BN_CTX *ctx = NULL; 251 unsigned int nbyte; 252 BIGNUM *pbn = NULL, *qbn = NULL, *gbn = NULL, *priv_key = NULL; 253 BIGNUM *pub_key = NULL; 254 255 nbyte = (bitlen + 7) >> 3; 256 257 dsa = DSA_new(); 258 ret = EVP_PKEY_new(); 259 if (dsa == NULL || ret == NULL) 260 goto memerr; 261 if (!read_lebn(&p, nbyte, &pbn)) 262 goto memerr; 263 264 if (!read_lebn(&p, 20, &qbn)) 265 goto memerr; 266 267 if (!read_lebn(&p, nbyte, &gbn)) 268 goto memerr; 269 270 if (ispub) { 271 if (!read_lebn(&p, nbyte, &pub_key)) 272 goto memerr; 273 } else { 274 if (!read_lebn(&p, 20, &priv_key)) 275 goto memerr; 276 277 /* Calculate public key */ 278 pub_key = BN_new(); 279 if (pub_key == NULL) 280 goto memerr; 281 if ((ctx = BN_CTX_new()) == NULL) 282 goto memerr; 283 284 if (!BN_mod_exp(pub_key, gbn, priv_key, pbn, ctx)) 285 goto memerr; 286 287 BN_CTX_free(ctx); 288 ctx = NULL; 289 } 290 if (!DSA_set0_pqg(dsa, pbn, qbn, gbn)) 291 goto memerr; 292 pbn = qbn = gbn = NULL; 293 if (!DSA_set0_key(dsa, pub_key, priv_key)) 294 goto memerr; 295 pub_key = priv_key = NULL; 296 297 if (!EVP_PKEY_set1_DSA(ret, dsa)) 298 goto memerr; 299 DSA_free(dsa); 300 *in = p; 301 return ret; 302 303 memerr: 304 PEMerr(PEM_F_B2I_DSS, ERR_R_MALLOC_FAILURE); 305 DSA_free(dsa); 306 BN_free(pbn); 307 BN_free(qbn); 308 BN_free(gbn); 309 BN_free(pub_key); 310 BN_free(priv_key); 311 EVP_PKEY_free(ret); 312 BN_CTX_free(ctx); 313 return NULL; 314 } 315 316 static EVP_PKEY *b2i_rsa(const unsigned char **in, 317 unsigned int bitlen, int ispub) 318 { 319 const unsigned char *pin = *in; 320 EVP_PKEY *ret = NULL; 321 BIGNUM *e = NULL, *n = NULL, *d = NULL; 322 BIGNUM *p = NULL, *q = NULL, *dmp1 = NULL, *dmq1 = NULL, *iqmp = NULL; 323 RSA *rsa = NULL; 324 unsigned int nbyte, hnbyte; 325 nbyte = (bitlen + 7) >> 3; 326 hnbyte = (bitlen + 15) >> 4; 327 rsa = RSA_new(); 328 ret = EVP_PKEY_new(); 329 if (rsa == NULL || ret == NULL) 330 goto memerr; 331 e = BN_new(); 332 if (e == NULL) 333 goto memerr; 334 if (!BN_set_word(e, read_ledword(&pin))) 335 goto memerr; 336 if (!read_lebn(&pin, nbyte, &n)) 337 goto memerr; 338 if (!ispub) { 339 if (!read_lebn(&pin, hnbyte, &p)) 340 goto memerr; 341 if (!read_lebn(&pin, hnbyte, &q)) 342 goto memerr; 343 if (!read_lebn(&pin, hnbyte, &dmp1)) 344 goto memerr; 345 if (!read_lebn(&pin, hnbyte, &dmq1)) 346 goto memerr; 347 if (!read_lebn(&pin, hnbyte, &iqmp)) 348 goto memerr; 349 if (!read_lebn(&pin, nbyte, &d)) 350 goto memerr; 351 if (!RSA_set0_factors(rsa, p, q)) 352 goto memerr; 353 p = q = NULL; 354 if (!RSA_set0_crt_params(rsa, dmp1, dmq1, iqmp)) 355 goto memerr; 356 dmp1 = dmq1 = iqmp = NULL; 357 } 358 if (!RSA_set0_key(rsa, n, e, d)) 359 goto memerr; 360 n = e = d = NULL; 361 362 if (!EVP_PKEY_set1_RSA(ret, rsa)) 363 goto memerr; 364 RSA_free(rsa); 365 *in = pin; 366 return ret; 367 memerr: 368 PEMerr(PEM_F_B2I_RSA, ERR_R_MALLOC_FAILURE); 369 BN_free(e); 370 BN_free(n); 371 BN_free(p); 372 BN_free(q); 373 BN_free(dmp1); 374 BN_free(dmq1); 375 BN_free(iqmp); 376 BN_free(d); 377 RSA_free(rsa); 378 EVP_PKEY_free(ret); 379 return NULL; 380 } 381 382 EVP_PKEY *b2i_PrivateKey(const unsigned char **in, long length) 383 { 384 return do_b2i(in, length, 0); 385 } 386 387 EVP_PKEY *b2i_PublicKey(const unsigned char **in, long length) 388 { 389 return do_b2i(in, length, 1); 390 } 391 392 EVP_PKEY *b2i_PrivateKey_bio(BIO *in) 393 { 394 return do_b2i_bio(in, 0); 395 } 396 397 EVP_PKEY *b2i_PublicKey_bio(BIO *in) 398 { 399 return do_b2i_bio(in, 1); 400 } 401 402 static void write_ledword(unsigned char **out, unsigned int dw) 403 { 404 unsigned char *p = *out; 405 *p++ = dw & 0xff; 406 *p++ = (dw >> 8) & 0xff; 407 *p++ = (dw >> 16) & 0xff; 408 *p++ = (dw >> 24) & 0xff; 409 *out = p; 410 } 411 412 static void write_lebn(unsigned char **out, const BIGNUM *bn, int len) 413 { 414 BN_bn2lebinpad(bn, *out, len); 415 *out += len; 416 } 417 418 static int check_bitlen_rsa(RSA *rsa, int ispub, unsigned int *magic); 419 static int check_bitlen_dsa(DSA *dsa, int ispub, unsigned int *magic); 420 421 static void write_rsa(unsigned char **out, RSA *rsa, int ispub); 422 static void write_dsa(unsigned char **out, DSA *dsa, int ispub); 423 424 static int do_i2b(unsigned char **out, EVP_PKEY *pk, int ispub) 425 { 426 unsigned char *p; 427 unsigned int bitlen, magic = 0, keyalg; 428 int outlen, noinc = 0; 429 int pktype = EVP_PKEY_id(pk); 430 if (pktype == EVP_PKEY_DSA) { 431 bitlen = check_bitlen_dsa(EVP_PKEY_get0_DSA(pk), ispub, &magic); 432 keyalg = MS_KEYALG_DSS_SIGN; 433 } else if (pktype == EVP_PKEY_RSA) { 434 bitlen = check_bitlen_rsa(EVP_PKEY_get0_RSA(pk), ispub, &magic); 435 keyalg = MS_KEYALG_RSA_KEYX; 436 } else 437 return -1; 438 if (bitlen == 0) 439 return -1; 440 outlen = 16 + blob_length(bitlen, 441 keyalg == MS_KEYALG_DSS_SIGN ? 1 : 0, ispub); 442 if (out == NULL) 443 return outlen; 444 if (*out) 445 p = *out; 446 else { 447 if ((p = OPENSSL_malloc(outlen)) == NULL) { 448 PEMerr(PEM_F_DO_I2B, ERR_R_MALLOC_FAILURE); 449 return -1; 450 } 451 *out = p; 452 noinc = 1; 453 } 454 if (ispub) 455 *p++ = MS_PUBLICKEYBLOB; 456 else 457 *p++ = MS_PRIVATEKEYBLOB; 458 *p++ = 0x2; 459 *p++ = 0; 460 *p++ = 0; 461 write_ledword(&p, keyalg); 462 write_ledword(&p, magic); 463 write_ledword(&p, bitlen); 464 if (keyalg == MS_KEYALG_DSS_SIGN) 465 write_dsa(&p, EVP_PKEY_get0_DSA(pk), ispub); 466 else 467 write_rsa(&p, EVP_PKEY_get0_RSA(pk), ispub); 468 if (!noinc) 469 *out += outlen; 470 return outlen; 471 } 472 473 static int do_i2b_bio(BIO *out, EVP_PKEY *pk, int ispub) 474 { 475 unsigned char *tmp = NULL; 476 int outlen, wrlen; 477 outlen = do_i2b(&tmp, pk, ispub); 478 if (outlen < 0) 479 return -1; 480 wrlen = BIO_write(out, tmp, outlen); 481 OPENSSL_free(tmp); 482 if (wrlen == outlen) 483 return outlen; 484 return -1; 485 } 486 487 static int check_bitlen_dsa(DSA *dsa, int ispub, unsigned int *pmagic) 488 { 489 int bitlen; 490 const BIGNUM *p = NULL, *q = NULL, *g = NULL; 491 const BIGNUM *pub_key = NULL, *priv_key = NULL; 492 493 DSA_get0_pqg(dsa, &p, &q, &g); 494 DSA_get0_key(dsa, &pub_key, &priv_key); 495 bitlen = BN_num_bits(p); 496 if ((bitlen & 7) || (BN_num_bits(q) != 160) 497 || (BN_num_bits(g) > bitlen)) 498 goto badkey; 499 if (ispub) { 500 if (BN_num_bits(pub_key) > bitlen) 501 goto badkey; 502 *pmagic = MS_DSS1MAGIC; 503 } else { 504 if (BN_num_bits(priv_key) > 160) 505 goto badkey; 506 *pmagic = MS_DSS2MAGIC; 507 } 508 509 return bitlen; 510 badkey: 511 PEMerr(PEM_F_CHECK_BITLEN_DSA, PEM_R_UNSUPPORTED_KEY_COMPONENTS); 512 return 0; 513 } 514 515 static int check_bitlen_rsa(RSA *rsa, int ispub, unsigned int *pmagic) 516 { 517 int nbyte, hnbyte, bitlen; 518 const BIGNUM *e; 519 520 RSA_get0_key(rsa, NULL, &e, NULL); 521 if (BN_num_bits(e) > 32) 522 goto badkey; 523 bitlen = RSA_bits(rsa); 524 nbyte = RSA_size(rsa); 525 hnbyte = (bitlen + 15) >> 4; 526 if (ispub) { 527 *pmagic = MS_RSA1MAGIC; 528 return bitlen; 529 } else { 530 const BIGNUM *d, *p, *q, *iqmp, *dmp1, *dmq1; 531 532 *pmagic = MS_RSA2MAGIC; 533 534 /* 535 * For private key each component must fit within nbyte or hnbyte. 536 */ 537 RSA_get0_key(rsa, NULL, NULL, &d); 538 if (BN_num_bytes(d) > nbyte) 539 goto badkey; 540 RSA_get0_factors(rsa, &p, &q); 541 RSA_get0_crt_params(rsa, &dmp1, &dmq1, &iqmp); 542 if ((BN_num_bytes(iqmp) > hnbyte) 543 || (BN_num_bytes(p) > hnbyte) 544 || (BN_num_bytes(q) > hnbyte) 545 || (BN_num_bytes(dmp1) > hnbyte) 546 || (BN_num_bytes(dmq1) > hnbyte)) 547 goto badkey; 548 } 549 return bitlen; 550 badkey: 551 PEMerr(PEM_F_CHECK_BITLEN_RSA, PEM_R_UNSUPPORTED_KEY_COMPONENTS); 552 return 0; 553 } 554 555 static void write_rsa(unsigned char **out, RSA *rsa, int ispub) 556 { 557 int nbyte, hnbyte; 558 const BIGNUM *n, *d, *e, *p, *q, *iqmp, *dmp1, *dmq1; 559 560 nbyte = RSA_size(rsa); 561 hnbyte = (RSA_bits(rsa) + 15) >> 4; 562 RSA_get0_key(rsa, &n, &e, &d); 563 write_lebn(out, e, 4); 564 write_lebn(out, n, nbyte); 565 if (ispub) 566 return; 567 RSA_get0_factors(rsa, &p, &q); 568 RSA_get0_crt_params(rsa, &dmp1, &dmq1, &iqmp); 569 write_lebn(out, p, hnbyte); 570 write_lebn(out, q, hnbyte); 571 write_lebn(out, dmp1, hnbyte); 572 write_lebn(out, dmq1, hnbyte); 573 write_lebn(out, iqmp, hnbyte); 574 write_lebn(out, d, nbyte); 575 } 576 577 static void write_dsa(unsigned char **out, DSA *dsa, int ispub) 578 { 579 int nbyte; 580 const BIGNUM *p = NULL, *q = NULL, *g = NULL; 581 const BIGNUM *pub_key = NULL, *priv_key = NULL; 582 583 DSA_get0_pqg(dsa, &p, &q, &g); 584 DSA_get0_key(dsa, &pub_key, &priv_key); 585 nbyte = BN_num_bytes(p); 586 write_lebn(out, p, nbyte); 587 write_lebn(out, q, 20); 588 write_lebn(out, g, nbyte); 589 if (ispub) 590 write_lebn(out, pub_key, nbyte); 591 else 592 write_lebn(out, priv_key, 20); 593 /* Set "invalid" for seed structure values */ 594 memset(*out, 0xff, 24); 595 *out += 24; 596 return; 597 } 598 599 int i2b_PrivateKey_bio(BIO *out, EVP_PKEY *pk) 600 { 601 return do_i2b_bio(out, pk, 0); 602 } 603 604 int i2b_PublicKey_bio(BIO *out, EVP_PKEY *pk) 605 { 606 return do_i2b_bio(out, pk, 1); 607 } 608 609 # ifndef OPENSSL_NO_RC4 610 611 static int do_PVK_header(const unsigned char **in, unsigned int length, 612 int skip_magic, 613 unsigned int *psaltlen, unsigned int *pkeylen) 614 { 615 const unsigned char *p = *in; 616 unsigned int pvk_magic, is_encrypted; 617 if (skip_magic) { 618 if (length < 20) { 619 PEMerr(PEM_F_DO_PVK_HEADER, PEM_R_PVK_TOO_SHORT); 620 return 0; 621 } 622 } else { 623 if (length < 24) { 624 PEMerr(PEM_F_DO_PVK_HEADER, PEM_R_PVK_TOO_SHORT); 625 return 0; 626 } 627 pvk_magic = read_ledword(&p); 628 if (pvk_magic != MS_PVKMAGIC) { 629 PEMerr(PEM_F_DO_PVK_HEADER, PEM_R_BAD_MAGIC_NUMBER); 630 return 0; 631 } 632 } 633 /* Skip reserved */ 634 p += 4; 635 /* 636 * keytype = 637 */ read_ledword(&p); 638 is_encrypted = read_ledword(&p); 639 *psaltlen = read_ledword(&p); 640 *pkeylen = read_ledword(&p); 641 642 if (*pkeylen > PVK_MAX_KEYLEN || *psaltlen > PVK_MAX_SALTLEN) 643 return 0; 644 645 if (is_encrypted && !*psaltlen) { 646 PEMerr(PEM_F_DO_PVK_HEADER, PEM_R_INCONSISTENT_HEADER); 647 return 0; 648 } 649 650 *in = p; 651 return 1; 652 } 653 654 static int derive_pvk_key(unsigned char *key, 655 const unsigned char *salt, unsigned int saltlen, 656 const unsigned char *pass, int passlen) 657 { 658 EVP_MD_CTX *mctx = EVP_MD_CTX_new(); 659 int rv = 1; 660 if (mctx == NULL 661 || !EVP_DigestInit_ex(mctx, EVP_sha1(), NULL) 662 || !EVP_DigestUpdate(mctx, salt, saltlen) 663 || !EVP_DigestUpdate(mctx, pass, passlen) 664 || !EVP_DigestFinal_ex(mctx, key, NULL)) 665 rv = 0; 666 667 EVP_MD_CTX_free(mctx); 668 return rv; 669 } 670 671 static EVP_PKEY *do_PVK_body(const unsigned char **in, 672 unsigned int saltlen, unsigned int keylen, 673 pem_password_cb *cb, void *u) 674 { 675 EVP_PKEY *ret = NULL; 676 const unsigned char *p = *in; 677 unsigned int magic; 678 unsigned char *enctmp = NULL, *q; 679 unsigned char keybuf[20]; 680 681 EVP_CIPHER_CTX *cctx = EVP_CIPHER_CTX_new(); 682 if (saltlen) { 683 char psbuf[PEM_BUFSIZE]; 684 int enctmplen, inlen; 685 if (cb) 686 inlen = cb(psbuf, PEM_BUFSIZE, 0, u); 687 else 688 inlen = PEM_def_callback(psbuf, PEM_BUFSIZE, 0, u); 689 if (inlen < 0) { 690 PEMerr(PEM_F_DO_PVK_BODY, PEM_R_BAD_PASSWORD_READ); 691 goto err; 692 } 693 enctmp = OPENSSL_malloc(keylen + 8); 694 if (enctmp == NULL) { 695 PEMerr(PEM_F_DO_PVK_BODY, ERR_R_MALLOC_FAILURE); 696 goto err; 697 } 698 if (!derive_pvk_key(keybuf, p, saltlen, 699 (unsigned char *)psbuf, inlen)) 700 goto err; 701 p += saltlen; 702 /* Copy BLOBHEADER across, decrypt rest */ 703 memcpy(enctmp, p, 8); 704 p += 8; 705 if (keylen < 8) { 706 PEMerr(PEM_F_DO_PVK_BODY, PEM_R_PVK_TOO_SHORT); 707 goto err; 708 } 709 inlen = keylen - 8; 710 q = enctmp + 8; 711 if (!EVP_DecryptInit_ex(cctx, EVP_rc4(), NULL, keybuf, NULL)) 712 goto err; 713 if (!EVP_DecryptUpdate(cctx, q, &enctmplen, p, inlen)) 714 goto err; 715 if (!EVP_DecryptFinal_ex(cctx, q + enctmplen, &enctmplen)) 716 goto err; 717 magic = read_ledword((const unsigned char **)&q); 718 if (magic != MS_RSA2MAGIC && magic != MS_DSS2MAGIC) { 719 q = enctmp + 8; 720 memset(keybuf + 5, 0, 11); 721 if (!EVP_DecryptInit_ex(cctx, EVP_rc4(), NULL, keybuf, NULL)) 722 goto err; 723 if (!EVP_DecryptUpdate(cctx, q, &enctmplen, p, inlen)) 724 goto err; 725 if (!EVP_DecryptFinal_ex(cctx, q + enctmplen, &enctmplen)) 726 goto err; 727 magic = read_ledword((const unsigned char **)&q); 728 if (magic != MS_RSA2MAGIC && magic != MS_DSS2MAGIC) { 729 PEMerr(PEM_F_DO_PVK_BODY, PEM_R_BAD_DECRYPT); 730 goto err; 731 } 732 } 733 p = enctmp; 734 } 735 736 ret = b2i_PrivateKey(&p, keylen); 737 err: 738 EVP_CIPHER_CTX_free(cctx); 739 if (enctmp != NULL) { 740 OPENSSL_cleanse(keybuf, sizeof(keybuf)); 741 OPENSSL_free(enctmp); 742 } 743 return ret; 744 } 745 746 EVP_PKEY *b2i_PVK_bio(BIO *in, pem_password_cb *cb, void *u) 747 { 748 unsigned char pvk_hdr[24], *buf = NULL; 749 const unsigned char *p; 750 int buflen; 751 EVP_PKEY *ret = NULL; 752 unsigned int saltlen, keylen; 753 if (BIO_read(in, pvk_hdr, 24) != 24) { 754 PEMerr(PEM_F_B2I_PVK_BIO, PEM_R_PVK_DATA_TOO_SHORT); 755 return NULL; 756 } 757 p = pvk_hdr; 758 759 if (!do_PVK_header(&p, 24, 0, &saltlen, &keylen)) 760 return 0; 761 buflen = (int)keylen + saltlen; 762 buf = OPENSSL_malloc(buflen); 763 if (buf == NULL) { 764 PEMerr(PEM_F_B2I_PVK_BIO, ERR_R_MALLOC_FAILURE); 765 return 0; 766 } 767 p = buf; 768 if (BIO_read(in, buf, buflen) != buflen) { 769 PEMerr(PEM_F_B2I_PVK_BIO, PEM_R_PVK_DATA_TOO_SHORT); 770 goto err; 771 } 772 ret = do_PVK_body(&p, saltlen, keylen, cb, u); 773 774 err: 775 OPENSSL_clear_free(buf, buflen); 776 return ret; 777 } 778 779 static int i2b_PVK(unsigned char **out, EVP_PKEY *pk, int enclevel, 780 pem_password_cb *cb, void *u) 781 { 782 int outlen = 24, pklen; 783 unsigned char *p = NULL, *start = NULL, *salt = NULL; 784 EVP_CIPHER_CTX *cctx = NULL; 785 if (enclevel) 786 outlen += PVK_SALTLEN; 787 pklen = do_i2b(NULL, pk, 0); 788 if (pklen < 0) 789 return -1; 790 outlen += pklen; 791 if (out == NULL) 792 return outlen; 793 if (*out != NULL) { 794 p = *out; 795 } else { 796 start = p = OPENSSL_malloc(outlen); 797 if (p == NULL) { 798 PEMerr(PEM_F_I2B_PVK, ERR_R_MALLOC_FAILURE); 799 return -1; 800 } 801 } 802 803 cctx = EVP_CIPHER_CTX_new(); 804 if (cctx == NULL) 805 goto error; 806 807 write_ledword(&p, MS_PVKMAGIC); 808 write_ledword(&p, 0); 809 if (EVP_PKEY_id(pk) == EVP_PKEY_DSA) 810 write_ledword(&p, MS_KEYTYPE_SIGN); 811 else 812 write_ledword(&p, MS_KEYTYPE_KEYX); 813 write_ledword(&p, enclevel ? 1 : 0); 814 write_ledword(&p, enclevel ? PVK_SALTLEN : 0); 815 write_ledword(&p, pklen); 816 if (enclevel) { 817 if (RAND_bytes(p, PVK_SALTLEN) <= 0) 818 goto error; 819 salt = p; 820 p += PVK_SALTLEN; 821 } 822 do_i2b(&p, pk, 0); 823 if (enclevel != 0) { 824 char psbuf[PEM_BUFSIZE]; 825 unsigned char keybuf[20]; 826 int enctmplen, inlen; 827 if (cb) 828 inlen = cb(psbuf, PEM_BUFSIZE, 1, u); 829 else 830 inlen = PEM_def_callback(psbuf, PEM_BUFSIZE, 1, u); 831 if (inlen <= 0) { 832 PEMerr(PEM_F_I2B_PVK, PEM_R_BAD_PASSWORD_READ); 833 goto error; 834 } 835 if (!derive_pvk_key(keybuf, salt, PVK_SALTLEN, 836 (unsigned char *)psbuf, inlen)) 837 goto error; 838 if (enclevel == 1) 839 memset(keybuf + 5, 0, 11); 840 p = salt + PVK_SALTLEN + 8; 841 if (!EVP_EncryptInit_ex(cctx, EVP_rc4(), NULL, keybuf, NULL)) 842 goto error; 843 OPENSSL_cleanse(keybuf, 20); 844 if (!EVP_DecryptUpdate(cctx, p, &enctmplen, p, pklen - 8)) 845 goto error; 846 if (!EVP_DecryptFinal_ex(cctx, p + enctmplen, &enctmplen)) 847 goto error; 848 } 849 850 EVP_CIPHER_CTX_free(cctx); 851 852 if (*out == NULL) 853 *out = start; 854 855 return outlen; 856 857 error: 858 EVP_CIPHER_CTX_free(cctx); 859 if (*out == NULL) 860 OPENSSL_free(start); 861 return -1; 862 } 863 864 int i2b_PVK_bio(BIO *out, EVP_PKEY *pk, int enclevel, 865 pem_password_cb *cb, void *u) 866 { 867 unsigned char *tmp = NULL; 868 int outlen, wrlen; 869 outlen = i2b_PVK(&tmp, pk, enclevel, cb, u); 870 if (outlen < 0) 871 return -1; 872 wrlen = BIO_write(out, tmp, outlen); 873 OPENSSL_free(tmp); 874 if (wrlen == outlen) { 875 PEMerr(PEM_F_I2B_PVK_BIO, PEM_R_BIO_WRITE_FAILURE); 876 return outlen; 877 } 878 return -1; 879 } 880 881 # endif 882 883 #endif 884