1 /* 2 * Copyright 2005-2020 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 = (unsigned int)*p++; 33 ret |= (unsigned int)*p++ << 8; 34 ret |= (unsigned int)*p++ << 16; 35 ret |= (unsigned int)*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 /* Set constant time flag before public key calculation */ 278 BN_set_flags(priv_key, BN_FLG_CONSTTIME); 279 280 /* Calculate public key */ 281 pub_key = BN_new(); 282 if (pub_key == NULL) 283 goto memerr; 284 if ((ctx = BN_CTX_new()) == NULL) 285 goto memerr; 286 287 if (!BN_mod_exp(pub_key, gbn, priv_key, pbn, ctx)) 288 goto memerr; 289 290 BN_CTX_free(ctx); 291 ctx = NULL; 292 } 293 if (!DSA_set0_pqg(dsa, pbn, qbn, gbn)) 294 goto memerr; 295 pbn = qbn = gbn = NULL; 296 if (!DSA_set0_key(dsa, pub_key, priv_key)) 297 goto memerr; 298 pub_key = priv_key = NULL; 299 300 if (!EVP_PKEY_set1_DSA(ret, dsa)) 301 goto memerr; 302 DSA_free(dsa); 303 *in = p; 304 return ret; 305 306 memerr: 307 PEMerr(PEM_F_B2I_DSS, ERR_R_MALLOC_FAILURE); 308 DSA_free(dsa); 309 BN_free(pbn); 310 BN_free(qbn); 311 BN_free(gbn); 312 BN_free(pub_key); 313 BN_free(priv_key); 314 EVP_PKEY_free(ret); 315 BN_CTX_free(ctx); 316 return NULL; 317 } 318 319 static EVP_PKEY *b2i_rsa(const unsigned char **in, 320 unsigned int bitlen, int ispub) 321 { 322 const unsigned char *pin = *in; 323 EVP_PKEY *ret = NULL; 324 BIGNUM *e = NULL, *n = NULL, *d = NULL; 325 BIGNUM *p = NULL, *q = NULL, *dmp1 = NULL, *dmq1 = NULL, *iqmp = NULL; 326 RSA *rsa = NULL; 327 unsigned int nbyte, hnbyte; 328 nbyte = (bitlen + 7) >> 3; 329 hnbyte = (bitlen + 15) >> 4; 330 rsa = RSA_new(); 331 ret = EVP_PKEY_new(); 332 if (rsa == NULL || ret == NULL) 333 goto memerr; 334 e = BN_new(); 335 if (e == NULL) 336 goto memerr; 337 if (!BN_set_word(e, read_ledword(&pin))) 338 goto memerr; 339 if (!read_lebn(&pin, nbyte, &n)) 340 goto memerr; 341 if (!ispub) { 342 if (!read_lebn(&pin, hnbyte, &p)) 343 goto memerr; 344 if (!read_lebn(&pin, hnbyte, &q)) 345 goto memerr; 346 if (!read_lebn(&pin, hnbyte, &dmp1)) 347 goto memerr; 348 if (!read_lebn(&pin, hnbyte, &dmq1)) 349 goto memerr; 350 if (!read_lebn(&pin, hnbyte, &iqmp)) 351 goto memerr; 352 if (!read_lebn(&pin, nbyte, &d)) 353 goto memerr; 354 if (!RSA_set0_factors(rsa, p, q)) 355 goto memerr; 356 p = q = NULL; 357 if (!RSA_set0_crt_params(rsa, dmp1, dmq1, iqmp)) 358 goto memerr; 359 dmp1 = dmq1 = iqmp = NULL; 360 } 361 if (!RSA_set0_key(rsa, n, e, d)) 362 goto memerr; 363 n = e = d = NULL; 364 365 if (!EVP_PKEY_set1_RSA(ret, rsa)) 366 goto memerr; 367 RSA_free(rsa); 368 *in = pin; 369 return ret; 370 memerr: 371 PEMerr(PEM_F_B2I_RSA, ERR_R_MALLOC_FAILURE); 372 BN_free(e); 373 BN_free(n); 374 BN_free(p); 375 BN_free(q); 376 BN_free(dmp1); 377 BN_free(dmq1); 378 BN_free(iqmp); 379 BN_free(d); 380 RSA_free(rsa); 381 EVP_PKEY_free(ret); 382 return NULL; 383 } 384 385 EVP_PKEY *b2i_PrivateKey(const unsigned char **in, long length) 386 { 387 return do_b2i(in, length, 0); 388 } 389 390 EVP_PKEY *b2i_PublicKey(const unsigned char **in, long length) 391 { 392 return do_b2i(in, length, 1); 393 } 394 395 EVP_PKEY *b2i_PrivateKey_bio(BIO *in) 396 { 397 return do_b2i_bio(in, 0); 398 } 399 400 EVP_PKEY *b2i_PublicKey_bio(BIO *in) 401 { 402 return do_b2i_bio(in, 1); 403 } 404 405 static void write_ledword(unsigned char **out, unsigned int dw) 406 { 407 unsigned char *p = *out; 408 *p++ = dw & 0xff; 409 *p++ = (dw >> 8) & 0xff; 410 *p++ = (dw >> 16) & 0xff; 411 *p++ = (dw >> 24) & 0xff; 412 *out = p; 413 } 414 415 static void write_lebn(unsigned char **out, const BIGNUM *bn, int len) 416 { 417 BN_bn2lebinpad(bn, *out, len); 418 *out += len; 419 } 420 421 static int check_bitlen_rsa(RSA *rsa, int ispub, unsigned int *magic); 422 static int check_bitlen_dsa(DSA *dsa, int ispub, unsigned int *magic); 423 424 static void write_rsa(unsigned char **out, RSA *rsa, int ispub); 425 static void write_dsa(unsigned char **out, DSA *dsa, int ispub); 426 427 static int do_i2b(unsigned char **out, EVP_PKEY *pk, int ispub) 428 { 429 unsigned char *p; 430 unsigned int bitlen, magic = 0, keyalg; 431 int outlen, noinc = 0; 432 int pktype = EVP_PKEY_id(pk); 433 if (pktype == EVP_PKEY_DSA) { 434 bitlen = check_bitlen_dsa(EVP_PKEY_get0_DSA(pk), ispub, &magic); 435 keyalg = MS_KEYALG_DSS_SIGN; 436 } else if (pktype == EVP_PKEY_RSA) { 437 bitlen = check_bitlen_rsa(EVP_PKEY_get0_RSA(pk), ispub, &magic); 438 keyalg = MS_KEYALG_RSA_KEYX; 439 } else 440 return -1; 441 if (bitlen == 0) 442 return -1; 443 outlen = 16 + blob_length(bitlen, 444 keyalg == MS_KEYALG_DSS_SIGN ? 1 : 0, ispub); 445 if (out == NULL) 446 return outlen; 447 if (*out) 448 p = *out; 449 else { 450 if ((p = OPENSSL_malloc(outlen)) == NULL) { 451 PEMerr(PEM_F_DO_I2B, ERR_R_MALLOC_FAILURE); 452 return -1; 453 } 454 *out = p; 455 noinc = 1; 456 } 457 if (ispub) 458 *p++ = MS_PUBLICKEYBLOB; 459 else 460 *p++ = MS_PRIVATEKEYBLOB; 461 *p++ = 0x2; 462 *p++ = 0; 463 *p++ = 0; 464 write_ledword(&p, keyalg); 465 write_ledword(&p, magic); 466 write_ledword(&p, bitlen); 467 if (keyalg == MS_KEYALG_DSS_SIGN) 468 write_dsa(&p, EVP_PKEY_get0_DSA(pk), ispub); 469 else 470 write_rsa(&p, EVP_PKEY_get0_RSA(pk), ispub); 471 if (!noinc) 472 *out += outlen; 473 return outlen; 474 } 475 476 static int do_i2b_bio(BIO *out, EVP_PKEY *pk, int ispub) 477 { 478 unsigned char *tmp = NULL; 479 int outlen, wrlen; 480 outlen = do_i2b(&tmp, pk, ispub); 481 if (outlen < 0) 482 return -1; 483 wrlen = BIO_write(out, tmp, outlen); 484 OPENSSL_free(tmp); 485 if (wrlen == outlen) 486 return outlen; 487 return -1; 488 } 489 490 static int check_bitlen_dsa(DSA *dsa, int ispub, unsigned int *pmagic) 491 { 492 int bitlen; 493 const BIGNUM *p = NULL, *q = NULL, *g = NULL; 494 const BIGNUM *pub_key = NULL, *priv_key = NULL; 495 496 DSA_get0_pqg(dsa, &p, &q, &g); 497 DSA_get0_key(dsa, &pub_key, &priv_key); 498 bitlen = BN_num_bits(p); 499 if ((bitlen & 7) || (BN_num_bits(q) != 160) 500 || (BN_num_bits(g) > bitlen)) 501 goto badkey; 502 if (ispub) { 503 if (BN_num_bits(pub_key) > bitlen) 504 goto badkey; 505 *pmagic = MS_DSS1MAGIC; 506 } else { 507 if (BN_num_bits(priv_key) > 160) 508 goto badkey; 509 *pmagic = MS_DSS2MAGIC; 510 } 511 512 return bitlen; 513 badkey: 514 PEMerr(PEM_F_CHECK_BITLEN_DSA, PEM_R_UNSUPPORTED_KEY_COMPONENTS); 515 return 0; 516 } 517 518 static int check_bitlen_rsa(RSA *rsa, int ispub, unsigned int *pmagic) 519 { 520 int nbyte, hnbyte, bitlen; 521 const BIGNUM *e; 522 523 RSA_get0_key(rsa, NULL, &e, NULL); 524 if (BN_num_bits(e) > 32) 525 goto badkey; 526 bitlen = RSA_bits(rsa); 527 nbyte = RSA_size(rsa); 528 hnbyte = (bitlen + 15) >> 4; 529 if (ispub) { 530 *pmagic = MS_RSA1MAGIC; 531 return bitlen; 532 } else { 533 const BIGNUM *d, *p, *q, *iqmp, *dmp1, *dmq1; 534 535 *pmagic = MS_RSA2MAGIC; 536 537 /* 538 * For private key each component must fit within nbyte or hnbyte. 539 */ 540 RSA_get0_key(rsa, NULL, NULL, &d); 541 if (BN_num_bytes(d) > nbyte) 542 goto badkey; 543 RSA_get0_factors(rsa, &p, &q); 544 RSA_get0_crt_params(rsa, &dmp1, &dmq1, &iqmp); 545 if ((BN_num_bytes(iqmp) > hnbyte) 546 || (BN_num_bytes(p) > hnbyte) 547 || (BN_num_bytes(q) > hnbyte) 548 || (BN_num_bytes(dmp1) > hnbyte) 549 || (BN_num_bytes(dmq1) > hnbyte)) 550 goto badkey; 551 } 552 return bitlen; 553 badkey: 554 PEMerr(PEM_F_CHECK_BITLEN_RSA, PEM_R_UNSUPPORTED_KEY_COMPONENTS); 555 return 0; 556 } 557 558 static void write_rsa(unsigned char **out, RSA *rsa, int ispub) 559 { 560 int nbyte, hnbyte; 561 const BIGNUM *n, *d, *e, *p, *q, *iqmp, *dmp1, *dmq1; 562 563 nbyte = RSA_size(rsa); 564 hnbyte = (RSA_bits(rsa) + 15) >> 4; 565 RSA_get0_key(rsa, &n, &e, &d); 566 write_lebn(out, e, 4); 567 write_lebn(out, n, nbyte); 568 if (ispub) 569 return; 570 RSA_get0_factors(rsa, &p, &q); 571 RSA_get0_crt_params(rsa, &dmp1, &dmq1, &iqmp); 572 write_lebn(out, p, hnbyte); 573 write_lebn(out, q, hnbyte); 574 write_lebn(out, dmp1, hnbyte); 575 write_lebn(out, dmq1, hnbyte); 576 write_lebn(out, iqmp, hnbyte); 577 write_lebn(out, d, nbyte); 578 } 579 580 static void write_dsa(unsigned char **out, DSA *dsa, int ispub) 581 { 582 int nbyte; 583 const BIGNUM *p = NULL, *q = NULL, *g = NULL; 584 const BIGNUM *pub_key = NULL, *priv_key = NULL; 585 586 DSA_get0_pqg(dsa, &p, &q, &g); 587 DSA_get0_key(dsa, &pub_key, &priv_key); 588 nbyte = BN_num_bytes(p); 589 write_lebn(out, p, nbyte); 590 write_lebn(out, q, 20); 591 write_lebn(out, g, nbyte); 592 if (ispub) 593 write_lebn(out, pub_key, nbyte); 594 else 595 write_lebn(out, priv_key, 20); 596 /* Set "invalid" for seed structure values */ 597 memset(*out, 0xff, 24); 598 *out += 24; 599 return; 600 } 601 602 int i2b_PrivateKey_bio(BIO *out, EVP_PKEY *pk) 603 { 604 return do_i2b_bio(out, pk, 0); 605 } 606 607 int i2b_PublicKey_bio(BIO *out, EVP_PKEY *pk) 608 { 609 return do_i2b_bio(out, pk, 1); 610 } 611 612 # ifndef OPENSSL_NO_RC4 613 614 static int do_PVK_header(const unsigned char **in, unsigned int length, 615 int skip_magic, 616 unsigned int *psaltlen, unsigned int *pkeylen) 617 { 618 const unsigned char *p = *in; 619 unsigned int pvk_magic, is_encrypted; 620 if (skip_magic) { 621 if (length < 20) { 622 PEMerr(PEM_F_DO_PVK_HEADER, PEM_R_PVK_TOO_SHORT); 623 return 0; 624 } 625 } else { 626 if (length < 24) { 627 PEMerr(PEM_F_DO_PVK_HEADER, PEM_R_PVK_TOO_SHORT); 628 return 0; 629 } 630 pvk_magic = read_ledword(&p); 631 if (pvk_magic != MS_PVKMAGIC) { 632 PEMerr(PEM_F_DO_PVK_HEADER, PEM_R_BAD_MAGIC_NUMBER); 633 return 0; 634 } 635 } 636 /* Skip reserved */ 637 p += 4; 638 /* 639 * keytype = 640 */ read_ledword(&p); 641 is_encrypted = read_ledword(&p); 642 *psaltlen = read_ledword(&p); 643 *pkeylen = read_ledword(&p); 644 645 if (*pkeylen > PVK_MAX_KEYLEN || *psaltlen > PVK_MAX_SALTLEN) 646 return 0; 647 648 if (is_encrypted && !*psaltlen) { 649 PEMerr(PEM_F_DO_PVK_HEADER, PEM_R_INCONSISTENT_HEADER); 650 return 0; 651 } 652 653 *in = p; 654 return 1; 655 } 656 657 static int derive_pvk_key(unsigned char *key, 658 const unsigned char *salt, unsigned int saltlen, 659 const unsigned char *pass, int passlen) 660 { 661 EVP_MD_CTX *mctx = EVP_MD_CTX_new(); 662 int rv = 1; 663 if (mctx == NULL 664 || !EVP_DigestInit_ex(mctx, EVP_sha1(), NULL) 665 || !EVP_DigestUpdate(mctx, salt, saltlen) 666 || !EVP_DigestUpdate(mctx, pass, passlen) 667 || !EVP_DigestFinal_ex(mctx, key, NULL)) 668 rv = 0; 669 670 EVP_MD_CTX_free(mctx); 671 return rv; 672 } 673 674 static EVP_PKEY *do_PVK_body(const unsigned char **in, 675 unsigned int saltlen, unsigned int keylen, 676 pem_password_cb *cb, void *u) 677 { 678 EVP_PKEY *ret = NULL; 679 const unsigned char *p = *in; 680 unsigned int magic; 681 unsigned char *enctmp = NULL, *q; 682 unsigned char keybuf[20]; 683 684 EVP_CIPHER_CTX *cctx = EVP_CIPHER_CTX_new(); 685 if (saltlen) { 686 char psbuf[PEM_BUFSIZE]; 687 int enctmplen, inlen; 688 if (cb) 689 inlen = cb(psbuf, PEM_BUFSIZE, 0, u); 690 else 691 inlen = PEM_def_callback(psbuf, PEM_BUFSIZE, 0, u); 692 if (inlen < 0) { 693 PEMerr(PEM_F_DO_PVK_BODY, PEM_R_BAD_PASSWORD_READ); 694 goto err; 695 } 696 enctmp = OPENSSL_malloc(keylen + 8); 697 if (enctmp == NULL) { 698 PEMerr(PEM_F_DO_PVK_BODY, ERR_R_MALLOC_FAILURE); 699 goto err; 700 } 701 if (!derive_pvk_key(keybuf, p, saltlen, 702 (unsigned char *)psbuf, inlen)) 703 goto err; 704 p += saltlen; 705 /* Copy BLOBHEADER across, decrypt rest */ 706 memcpy(enctmp, p, 8); 707 p += 8; 708 if (keylen < 8) { 709 PEMerr(PEM_F_DO_PVK_BODY, PEM_R_PVK_TOO_SHORT); 710 goto err; 711 } 712 inlen = keylen - 8; 713 q = enctmp + 8; 714 if (!EVP_DecryptInit_ex(cctx, EVP_rc4(), NULL, keybuf, NULL)) 715 goto err; 716 if (!EVP_DecryptUpdate(cctx, q, &enctmplen, p, inlen)) 717 goto err; 718 if (!EVP_DecryptFinal_ex(cctx, q + enctmplen, &enctmplen)) 719 goto err; 720 magic = read_ledword((const unsigned char **)&q); 721 if (magic != MS_RSA2MAGIC && magic != MS_DSS2MAGIC) { 722 q = enctmp + 8; 723 memset(keybuf + 5, 0, 11); 724 if (!EVP_DecryptInit_ex(cctx, EVP_rc4(), NULL, keybuf, NULL)) 725 goto err; 726 if (!EVP_DecryptUpdate(cctx, q, &enctmplen, p, inlen)) 727 goto err; 728 if (!EVP_DecryptFinal_ex(cctx, q + enctmplen, &enctmplen)) 729 goto err; 730 magic = read_ledword((const unsigned char **)&q); 731 if (magic != MS_RSA2MAGIC && magic != MS_DSS2MAGIC) { 732 PEMerr(PEM_F_DO_PVK_BODY, PEM_R_BAD_DECRYPT); 733 goto err; 734 } 735 } 736 p = enctmp; 737 } 738 739 ret = b2i_PrivateKey(&p, keylen); 740 err: 741 EVP_CIPHER_CTX_free(cctx); 742 if (enctmp != NULL) { 743 OPENSSL_cleanse(keybuf, sizeof(keybuf)); 744 OPENSSL_free(enctmp); 745 } 746 return ret; 747 } 748 749 EVP_PKEY *b2i_PVK_bio(BIO *in, pem_password_cb *cb, void *u) 750 { 751 unsigned char pvk_hdr[24], *buf = NULL; 752 const unsigned char *p; 753 int buflen; 754 EVP_PKEY *ret = NULL; 755 unsigned int saltlen, keylen; 756 if (BIO_read(in, pvk_hdr, 24) != 24) { 757 PEMerr(PEM_F_B2I_PVK_BIO, PEM_R_PVK_DATA_TOO_SHORT); 758 return NULL; 759 } 760 p = pvk_hdr; 761 762 if (!do_PVK_header(&p, 24, 0, &saltlen, &keylen)) 763 return 0; 764 buflen = (int)keylen + saltlen; 765 buf = OPENSSL_malloc(buflen); 766 if (buf == NULL) { 767 PEMerr(PEM_F_B2I_PVK_BIO, ERR_R_MALLOC_FAILURE); 768 return 0; 769 } 770 p = buf; 771 if (BIO_read(in, buf, buflen) != buflen) { 772 PEMerr(PEM_F_B2I_PVK_BIO, PEM_R_PVK_DATA_TOO_SHORT); 773 goto err; 774 } 775 ret = do_PVK_body(&p, saltlen, keylen, cb, u); 776 777 err: 778 OPENSSL_clear_free(buf, buflen); 779 return ret; 780 } 781 782 static int i2b_PVK(unsigned char **out, EVP_PKEY *pk, int enclevel, 783 pem_password_cb *cb, void *u) 784 { 785 int outlen = 24, pklen; 786 unsigned char *p = NULL, *start = NULL, *salt = NULL; 787 EVP_CIPHER_CTX *cctx = NULL; 788 if (enclevel) 789 outlen += PVK_SALTLEN; 790 pklen = do_i2b(NULL, pk, 0); 791 if (pklen < 0) 792 return -1; 793 outlen += pklen; 794 if (out == NULL) 795 return outlen; 796 if (*out != NULL) { 797 p = *out; 798 } else { 799 start = p = OPENSSL_malloc(outlen); 800 if (p == NULL) { 801 PEMerr(PEM_F_I2B_PVK, ERR_R_MALLOC_FAILURE); 802 return -1; 803 } 804 } 805 806 cctx = EVP_CIPHER_CTX_new(); 807 if (cctx == NULL) 808 goto error; 809 810 write_ledword(&p, MS_PVKMAGIC); 811 write_ledword(&p, 0); 812 if (EVP_PKEY_id(pk) == EVP_PKEY_DSA) 813 write_ledword(&p, MS_KEYTYPE_SIGN); 814 else 815 write_ledword(&p, MS_KEYTYPE_KEYX); 816 write_ledword(&p, enclevel ? 1 : 0); 817 write_ledword(&p, enclevel ? PVK_SALTLEN : 0); 818 write_ledword(&p, pklen); 819 if (enclevel) { 820 if (RAND_bytes(p, PVK_SALTLEN) <= 0) 821 goto error; 822 salt = p; 823 p += PVK_SALTLEN; 824 } 825 do_i2b(&p, pk, 0); 826 if (enclevel != 0) { 827 char psbuf[PEM_BUFSIZE]; 828 unsigned char keybuf[20]; 829 int enctmplen, inlen; 830 if (cb) 831 inlen = cb(psbuf, PEM_BUFSIZE, 1, u); 832 else 833 inlen = PEM_def_callback(psbuf, PEM_BUFSIZE, 1, u); 834 if (inlen <= 0) { 835 PEMerr(PEM_F_I2B_PVK, PEM_R_BAD_PASSWORD_READ); 836 goto error; 837 } 838 if (!derive_pvk_key(keybuf, salt, PVK_SALTLEN, 839 (unsigned char *)psbuf, inlen)) 840 goto error; 841 if (enclevel == 1) 842 memset(keybuf + 5, 0, 11); 843 p = salt + PVK_SALTLEN + 8; 844 if (!EVP_EncryptInit_ex(cctx, EVP_rc4(), NULL, keybuf, NULL)) 845 goto error; 846 OPENSSL_cleanse(keybuf, 20); 847 if (!EVP_EncryptUpdate(cctx, p, &enctmplen, p, pklen - 8)) 848 goto error; 849 if (!EVP_EncryptFinal_ex(cctx, p + enctmplen, &enctmplen)) 850 goto error; 851 } 852 853 EVP_CIPHER_CTX_free(cctx); 854 855 if (*out == NULL) 856 *out = start; 857 858 return outlen; 859 860 error: 861 EVP_CIPHER_CTX_free(cctx); 862 if (*out == NULL) 863 OPENSSL_free(start); 864 return -1; 865 } 866 867 int i2b_PVK_bio(BIO *out, EVP_PKEY *pk, int enclevel, 868 pem_password_cb *cb, void *u) 869 { 870 unsigned char *tmp = NULL; 871 int outlen, wrlen; 872 outlen = i2b_PVK(&tmp, pk, enclevel, cb, u); 873 if (outlen < 0) 874 return -1; 875 wrlen = BIO_write(out, tmp, outlen); 876 OPENSSL_free(tmp); 877 if (wrlen == outlen) { 878 return outlen; 879 } 880 PEMerr(PEM_F_I2B_PVK_BIO, PEM_R_BIO_WRITE_FAILURE); 881 return -1; 882 } 883 884 # endif 885 886 #endif 887