lib/libcrypto/pem/pvkfmt.c

   1 /* $OpenBSD: pvkfmt.c,v 1.19 2017/05/02 03:59:44 deraadt Exp $ */
   2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
   3  * project 2005.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 2005 The OpenSSL Project.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in
  17  *    the documentation and/or other materials provided with the
  18  *    distribution.
  19  *
  20  * 3. All advertising materials mentioning features or use of this
  21  *    software must display the following acknowledgment:
  22  *    "This product includes software developed by the OpenSSL Project
  23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  24  *
  25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  26  *    endorse or promote products derived from this software without
  27  *    prior written permission. For written permission, please contact
  28  *    licensing@OpenSSL.org.
  29  *
  30  * 5. Products derived from this software may not be called "OpenSSL"
  31  *    nor may "OpenSSL" appear in their names without prior written
  32  *    permission of the OpenSSL Project.
  33  *
  34  * 6. Redistributions of any form whatsoever must retain the following
  35  *    acknowledgment:
  36  *    "This product includes software developed by the OpenSSL Project
  37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  38  *
  39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  50  * OF THE POSSIBILITY OF SUCH DAMAGE.
  51  * ====================================================================
  52  *
  53  * This product includes cryptographic software written by Eric Young
  54  * (eay@cryptsoft.com).  This product includes software written by Tim
  55  * Hudson (tjh@cryptsoft.com).
  56  *
  57  */
  58
  59 /* Support for PVK format keys and related structures (such a PUBLICKEYBLOB
  60  * and PRIVATEKEYBLOB).
  61  */
  62
  63 #include <stdlib.h>
  64 #include <string.h>
  65
  66 #include <openssl/opensslconf.h>
  67
  68 #include <openssl/bn.h>
  69 #include <openssl/err.h>
  70 #include <openssl/pem.h>
  71
  72 #if !defined(OPENSSL_NO_RSA) && !defined(OPENSSL_NO_DSA)
  73 #include <openssl/dsa.h>
  74 #include <openssl/rsa.h>
  75
  76 #include "bn_lcl.h"
  77
  78 /* Utility function: read a DWORD (4 byte unsigned integer) in little endian
  79  * format
  80  */
  81
  82 static unsigned int
  83 read_ledword(const unsigned char **in)
  84 {
  85         const unsigned char *p = *in;
  86         unsigned int ret;
  87
  88         ret = *p++;
  89         ret |= (*p++ << 8);
  90         ret |= (*p++ << 16);
  91         ret |= (*p++ << 24);
  92         *in = p;
  93         return ret;
  94 }
  95
  96 /* Read a BIGNUM in little endian format. The docs say that this should take up
  97  * bitlen/8 bytes.
  98  */
  99
 100 static int
 101 read_lebn(const unsigned char **in, unsigned int nbyte, BIGNUM **r)
 102 {
 103         const unsigned char *p;
 104         unsigned char *tmpbuf, *q;
 105         unsigned int i;
 106
 107         p = *in + nbyte - 1;
 108         tmpbuf = malloc(nbyte);
 109         if (!tmpbuf)
 110                 return 0;
 111         q = tmpbuf;
 112         for (i = 0; i < nbyte; i++)
 113                 *q++ = *p--;
 114         *r = BN_bin2bn(tmpbuf, nbyte, NULL);
 115         free(tmpbuf);
 116         if (*r) {
 117                 *in += nbyte;
 118                 return 1;
 119         } else
 120                 return 0;
 121 }
 122
 123
 124 /* Convert private key blob to EVP_PKEY: RSA and DSA keys supported */
 125
 126 #define MS_PUBLICKEYBLOB        0x6
 127 #define MS_PRIVATEKEYBLOB       0x7
 128 #define MS_RSA1MAGIC            0x31415352L
 129 #define MS_RSA2MAGIC            0x32415352L
 130 #define MS_DSS1MAGIC            0x31535344L
 131 #define MS_DSS2MAGIC            0x32535344L
 132
 133 #define MS_KEYALG_RSA_KEYX      0xa400
 134 #define MS_KEYALG_DSS_SIGN      0x2200
 135
 136 #define MS_KEYTYPE_KEYX         0x1
 137 #define MS_KEYTYPE_SIGN         0x2
 138
 139 /* The PVK file magic number: seems to spell out "bobsfile", who is Bob? */
 140 #define MS_PVKMAGIC             0xb0b5f11eL
 141 /* Salt length for PVK files */
 142 #define PVK_SALTLEN             0x10
 143
 144 static EVP_PKEY *b2i_rsa(const unsigned char **in, unsigned int length,
 145     unsigned int bitlen, int ispub);
 146 static EVP_PKEY *b2i_dss(const unsigned char **in, unsigned int length,
 147     unsigned int bitlen, int ispub);
 148
 149 static int
 150 do_blob_header(const unsigned char **in, unsigned int length,
 151     unsigned int *pmagic, unsigned int *pbitlen, int *pisdss, int *pispub)
 152 {
 153         const unsigned char *p = *in;
 154
 155         if (length < 16)
 156                 return 0;
 157         /* bType */
 158         if (*p == MS_PUBLICKEYBLOB) {
 159                 if (*pispub == 0) {
 160                         PEMerror(PEM_R_EXPECTING_PRIVATE_KEY_BLOB);
 161                         return 0;
 162                 }
 163                 *pispub = 1;
 164         } else if (*p == MS_PRIVATEKEYBLOB) {
 165                 if (*pispub == 1) {
 166                         PEMerror(PEM_R_EXPECTING_PUBLIC_KEY_BLOB);
 167                         return 0;
 168                 }
 169                 *pispub = 0;
 170         } else
 171                 return 0;
 172         p++;
 173         /* Version */
 174         if (*p++ != 0x2) {
 175                 PEMerror(PEM_R_BAD_VERSION_NUMBER);
 176                 return 0;
 177         }
 178         /* Ignore reserved, aiKeyAlg */
 179         p += 6;
 180         *pmagic = read_ledword(&p);
 181         *pbitlen = read_ledword(&p);
 182         if (*pbitlen > 65536) {
 183                 PEMerror(PEM_R_INCONSISTENT_HEADER);
 184                 return 0;
 185         }
 186         *pisdss = 0;
 187         switch (*pmagic) {
 188
 189         case MS_DSS1MAGIC:
 190                 *pisdss = 1;
 191         case MS_RSA1MAGIC:
 192                 if (*pispub == 0) {
 193                         PEMerror(PEM_R_EXPECTING_PRIVATE_KEY_BLOB);
 194                         return 0;
 195                 }
 196                 break;
 197
 198         case MS_DSS2MAGIC:
 199                 *pisdss = 1;
 200         case MS_RSA2MAGIC:
 201                 if (*pispub == 1) {
 202                         PEMerror(PEM_R_EXPECTING_PUBLIC_KEY_BLOB);
 203                         return 0;
 204                 }
 205                 break;
 206
 207         default:
 208                 PEMerror(PEM_R_BAD_MAGIC_NUMBER);
 209                 return -1;
 210         }
 211         *in = p;
 212         return 1;
 213 }
 214
 215 static unsigned int
 216 blob_length(unsigned bitlen, int isdss, int ispub)
 217 {
 218         unsigned int nbyte, hnbyte;
 219
 220         nbyte = (bitlen + 7) >> 3;
 221         hnbyte = (bitlen + 15) >> 4;
 222         if (isdss) {
 223
 224                 /* Expected length: 20 for q + 3 components bitlen each + 24
 225                  * for seed structure.
 226                  */
 227                 if (ispub)
 228                         return 44 + 3 * nbyte;
 229                 /* Expected length: 20 for q, priv, 2 bitlen components + 24
 230                  * for seed structure.
 231                  */
 232                 else
 233                         return 64 + 2 * nbyte;
 234         } else {
 235                 /* Expected length: 4 for 'e' + 'n' */
 236                 if (ispub)
 237                         return 4 + nbyte;
 238                 else
 239                 /* Expected length: 4 for 'e' and 7 other components.
 240                  * 2 components are bitlen size, 5 are bitlen/2
 241                  */
 242                                 return 4 + 2*nbyte + 5*hnbyte;
 243         }
 244
 245 }
 246
 247 static EVP_PKEY *
 248 do_b2i(const unsigned char **in, unsigned int length, int ispub)
 249 {
 250         const unsigned char *p = *in;
 251         unsigned int bitlen, magic;
 252         int isdss;
 253
 254         if (do_blob_header(&p, length, &magic, &bitlen, &isdss, &ispub) <= 0) {
 255                 PEMerror(PEM_R_KEYBLOB_HEADER_PARSE_ERROR);
 256                 return NULL;
 257         }
 258         length -= 16;
 259         if (length < blob_length(bitlen, isdss, ispub)) {
 260                 PEMerror(PEM_R_KEYBLOB_TOO_SHORT);
 261                 return NULL;
 262         }
 263         if (isdss)
 264                 return b2i_dss(&p, length, bitlen, ispub);
 265         else
 266                 return b2i_rsa(&p, length, bitlen, ispub);
 267 }
 268
 269 static EVP_PKEY *
 270 do_b2i_bio(BIO *in, int ispub)
 271 {
 272         const unsigned char *p;
 273         unsigned char hdr_buf[16], *buf = NULL;
 274         unsigned int bitlen, magic, length;
 275         int isdss;
 276         EVP_PKEY *ret = NULL;
 277
 278         if (BIO_read(in, hdr_buf, 16) != 16) {
 279                 PEMerror(PEM_R_KEYBLOB_TOO_SHORT);
 280                 return NULL;
 281         }
 282         p = hdr_buf;
 283         if (do_blob_header(&p, 16, &magic, &bitlen, &isdss, &ispub) <= 0)
 284                 return NULL;
 285
 286         length = blob_length(bitlen, isdss, ispub);
 287         buf = malloc(length);
 288         if (!buf) {
 289                 PEMerror(ERR_R_MALLOC_FAILURE);
 290                 goto err;
 291         }
 292         p = buf;
 293         if (BIO_read(in, buf, length) != (int)length) {
 294                 PEMerror(PEM_R_KEYBLOB_TOO_SHORT);
 295                 goto err;
 296         }
 297
 298         if (isdss)
 299                 ret = b2i_dss(&p, length, bitlen, ispub);
 300         else
 301                 ret = b2i_rsa(&p, length, bitlen, ispub);
 302
 303 err:
 304         free(buf);
 305         return ret;
 306 }
 307
 308 static EVP_PKEY *
 309 b2i_dss(const unsigned char **in, unsigned int length, unsigned int bitlen,
 310     int ispub)
 311 {
 312         const unsigned char *p = *in;
 313         EVP_PKEY *ret = NULL;
 314         DSA *dsa = NULL;
 315         BN_CTX *ctx = NULL;
 316         unsigned int nbyte;
 317
 318         nbyte = (bitlen + 7) >> 3;
 319
 320         dsa = DSA_new();
 321         ret = EVP_PKEY_new();
 322         if (!dsa || !ret)
 323                 goto memerr;
 324         if (!read_lebn(&p, nbyte, &dsa->p))
 325                 goto memerr;
 326         if (!read_lebn(&p, 20, &dsa->q))
 327                 goto memerr;
 328         if (!read_lebn(&p, nbyte, &dsa->g))
 329                 goto memerr;
 330         if (ispub) {
 331                 if (!read_lebn(&p, nbyte, &dsa->pub_key))
 332                         goto memerr;
 333         } else {
 334                 if (!read_lebn(&p, 20, &dsa->priv_key))
 335                         goto memerr;
 336                 /* Calculate public key */
 337                 if (!(dsa->pub_key = BN_new()))
 338                         goto memerr;
 339                 if (!(ctx = BN_CTX_new()))
 340                         goto memerr;
 341                 if (!BN_mod_exp_ct(dsa->pub_key, dsa->g,
 342                     dsa->priv_key, dsa->p, ctx))
 343                         goto memerr;
 344                 BN_CTX_free(ctx);
 345         }
 346
 347         EVP_PKEY_set1_DSA(ret, dsa);
 348         DSA_free(dsa);
 349         *in = p;
 350         return ret;
 351
 352 memerr:
 353         PEMerror(ERR_R_MALLOC_FAILURE);
 354         DSA_free(dsa);
 355         EVP_PKEY_free(ret);
 356         BN_CTX_free(ctx);
 357         return NULL;
 358 }
 359
 360 static EVP_PKEY *
 361 b2i_rsa(const unsigned char **in, unsigned int length, unsigned int bitlen,
 362     int ispub)
 363 {
 364         const unsigned char *p = *in;
 365         EVP_PKEY *ret = NULL;
 366         RSA *rsa = NULL;
 367         unsigned int nbyte, hnbyte;
 368
 369         nbyte = (bitlen + 7) >> 3;
 370         hnbyte = (bitlen + 15) >> 4;
 371         rsa = RSA_new();
 372         ret = EVP_PKEY_new();
 373         if (!rsa || !ret)
 374                 goto memerr;
 375         rsa->e = BN_new();
 376         if (!rsa->e)
 377                 goto memerr;
 378         if (!BN_set_word(rsa->e, read_ledword(&p)))
 379                 goto memerr;
 380         if (!read_lebn(&p, nbyte, &rsa->n))
 381                 goto memerr;
 382         if (!ispub) {
 383                 if (!read_lebn(&p, hnbyte, &rsa->p))
 384                         goto memerr;
 385                 if (!read_lebn(&p, hnbyte, &rsa->q))
 386                         goto memerr;
 387                 if (!read_lebn(&p, hnbyte, &rsa->dmp1))
 388                         goto memerr;
 389                 if (!read_lebn(&p, hnbyte, &rsa->dmq1))
 390                         goto memerr;
 391                 if (!read_lebn(&p, hnbyte, &rsa->iqmp))
 392                         goto memerr;
 393                 if (!read_lebn(&p, nbyte, &rsa->d))
 394                         goto memerr;
 395         }
 396
 397         EVP_PKEY_set1_RSA(ret, rsa);
 398         RSA_free(rsa);
 399         *in = p;
 400         return ret;
 401
 402 memerr:
 403         PEMerror(ERR_R_MALLOC_FAILURE);
 404         RSA_free(rsa);
 405         EVP_PKEY_free(ret);
 406         return NULL;
 407 }
 408
 409 EVP_PKEY *
 410 b2i_PrivateKey(const unsigned char **in, long length)
 411 {
 412         return do_b2i(in, length, 0);
 413 }
 414
 415 EVP_PKEY *
 416 b2i_PublicKey(const unsigned char **in, long length)
 417 {
 418         return do_b2i(in, length, 1);
 419 }
 420
 421 EVP_PKEY *
 422 b2i_PrivateKey_bio(BIO *in)
 423 {
 424         return do_b2i_bio(in, 0);
 425 }
 426
 427 EVP_PKEY *
 428 b2i_PublicKey_bio(BIO *in)
 429 {
 430         return do_b2i_bio(in, 1);
 431 }
 432
 433 static void
 434 write_ledword(unsigned char **out, unsigned int dw)
 435 {
 436         unsigned char *p = *out;
 437
 438         *p++ = dw & 0xff;
 439         *p++ = (dw >> 8) & 0xff;
 440         *p++ = (dw >> 16) & 0xff;
 441         *p++ = (dw >> 24) & 0xff;
 442         *out = p;
 443 }
 444
 445 static void
 446 write_lebn(unsigned char **out, const BIGNUM *bn, int len)
 447 {
 448         int nb, i;
 449         unsigned char *p = *out, *q, c;
 450
 451         nb = BN_num_bytes(bn);
 452         BN_bn2bin(bn, p);
 453         q = p + nb - 1;
 454         /* In place byte order reversal */
 455         for (i = 0; i < nb / 2; i++) {
 456                 c = *p;
 457                 *p++ = *q;
 458                 *q-- = c;
 459         }
 460         *out += nb;
 461         /* Pad with zeroes if we have to */
 462         if (len > 0) {
 463                 len -= nb;
 464                 if (len > 0) {
 465                         memset(*out, 0, len);
 466                         *out += len;
 467                 }
 468         }
 469 }
 470
 471
 472 static int check_bitlen_rsa(RSA *rsa, int ispub, unsigned int *magic);
 473 static int check_bitlen_dsa(DSA *dsa, int ispub, unsigned int *magic);
 474
 475 static void write_rsa(unsigned char **out, RSA *rsa, int ispub);
 476 static void write_dsa(unsigned char **out, DSA *dsa, int ispub);
 477
 478 static int
 479 do_i2b(unsigned char **out, EVP_PKEY *pk, int ispub)
 480 {
 481         unsigned char *p;
 482         unsigned int bitlen, magic = 0, keyalg;
 483         int outlen, noinc = 0;
 484
 485         if (pk->type == EVP_PKEY_DSA) {
 486                 bitlen = check_bitlen_dsa(pk->pkey.dsa, ispub, &magic);
 487                 keyalg = MS_KEYALG_DSS_SIGN;
 488         } else if (pk->type == EVP_PKEY_RSA) {
 489                 bitlen = check_bitlen_rsa(pk->pkey.rsa, ispub, &magic);
 490                 keyalg = MS_KEYALG_RSA_KEYX;
 491         } else
 492                 return -1;
 493         if (bitlen == 0)
 494                 return -1;
 495         outlen = 16 + blob_length(bitlen,
 496             keyalg == MS_KEYALG_DSS_SIGN ? 1 : 0, ispub);
 497         if (out == NULL)
 498                 return outlen;
 499         if (*out)
 500                 p = *out;
 501         else {
 502                 p = malloc(outlen);
 503                 if (!p)
 504                         return -1;
 505                 *out = p;
 506                 noinc = 1;
 507         }
 508         if (ispub)
 509                 *p++ = MS_PUBLICKEYBLOB;
 510         else
 511                 *p++ = MS_PRIVATEKEYBLOB;
 512         *p++ = 0x2;
 513         *p++ = 0;
 514         *p++ = 0;
 515         write_ledword(&p, keyalg);
 516         write_ledword(&p, magic);
 517         write_ledword(&p, bitlen);
 518         if (keyalg == MS_KEYALG_DSS_SIGN)
 519                 write_dsa(&p, pk->pkey.dsa, ispub);
 520         else
 521                 write_rsa(&p, pk->pkey.rsa, ispub);
 522         if (!noinc)
 523                 *out += outlen;
 524         return outlen;
 525 }
 526
 527 static int
 528 do_i2b_bio(BIO *out, EVP_PKEY *pk, int ispub)
 529 {
 530         unsigned char *tmp = NULL;
 531         int outlen, wrlen;
 532
 533         outlen = do_i2b(&tmp, pk, ispub);
 534         if (outlen < 0)
 535                 return -1;
 536         wrlen = BIO_write(out, tmp, outlen);
 537         free(tmp);
 538         if (wrlen == outlen)
 539                 return outlen;
 540         return -1;
 541 }
 542
 543 static int
 544 check_bitlen_dsa(DSA *dsa, int ispub, unsigned int *pmagic)
 545 {
 546         int bitlen;
 547
 548         bitlen = BN_num_bits(dsa->p);
 549         if ((bitlen & 7) || (BN_num_bits(dsa->q) != 160) ||
 550             (BN_num_bits(dsa->g) > bitlen))
 551                 goto badkey;
 552         if (ispub) {
 553                 if (BN_num_bits(dsa->pub_key) > bitlen)
 554                         goto badkey;
 555                 *pmagic = MS_DSS1MAGIC;
 556         } else {
 557                 if (BN_num_bits(dsa->priv_key) > 160)
 558                         goto badkey;
 559                 *pmagic = MS_DSS2MAGIC;
 560         }
 561
 562         return bitlen;
 563
 564 badkey:
 565         PEMerror(PEM_R_UNSUPPORTED_KEY_COMPONENTS);
 566         return 0;
 567 }
 568
 569 static int
 570 check_bitlen_rsa(RSA *rsa, int ispub, unsigned int *pmagic)
 571 {
 572         int nbyte, hnbyte, bitlen;
 573
 574         if (BN_num_bits(rsa->e) > 32)
 575                 goto badkey;
 576         bitlen = BN_num_bits(rsa->n);
 577         nbyte = BN_num_bytes(rsa->n);
 578         hnbyte = (BN_num_bits(rsa->n) + 15) >> 4;
 579         if (ispub) {
 580                 *pmagic = MS_RSA1MAGIC;
 581                 return bitlen;
 582         } else {
 583                 *pmagic = MS_RSA2MAGIC;
 584                 /* For private key each component must fit within nbyte or
 585                  * hnbyte.
 586                  */
 587                 if (BN_num_bytes(rsa->d) > nbyte)
 588                         goto badkey;
 589                 if ((BN_num_bytes(rsa->iqmp) > hnbyte) ||
 590                     (BN_num_bytes(rsa->p) > hnbyte) ||
 591                     (BN_num_bytes(rsa->q) > hnbyte) ||
 592                     (BN_num_bytes(rsa->dmp1) > hnbyte) ||
 593                     (BN_num_bytes(rsa->dmq1) > hnbyte))
 594                         goto badkey;
 595         }
 596         return bitlen;
 597
 598 badkey:
 599         PEMerror(PEM_R_UNSUPPORTED_KEY_COMPONENTS);
 600         return 0;
 601 }
 602
 603 static void
 604 write_rsa(unsigned char **out, RSA *rsa, int ispub)
 605 {
 606         int nbyte, hnbyte;
 607
 608         nbyte = BN_num_bytes(rsa->n);
 609         hnbyte = (BN_num_bits(rsa->n) + 15) >> 4;
 610         write_lebn(out, rsa->e, 4);
 611         write_lebn(out, rsa->n, -1);
 612         if (ispub)
 613                 return;
 614         write_lebn(out, rsa->p, hnbyte);
 615         write_lebn(out, rsa->q, hnbyte);
 616         write_lebn(out, rsa->dmp1, hnbyte);
 617         write_lebn(out, rsa->dmq1, hnbyte);
 618         write_lebn(out, rsa->iqmp, hnbyte);
 619         write_lebn(out, rsa->d, nbyte);
 620 }
 621
 622 static void
 623 write_dsa(unsigned char **out, DSA *dsa, int ispub)
 624 {
 625         int nbyte;
 626
 627         nbyte = BN_num_bytes(dsa->p);
 628         write_lebn(out, dsa->p, nbyte);
 629         write_lebn(out, dsa->q, 20);
 630         write_lebn(out, dsa->g, nbyte);
 631         if (ispub)
 632                 write_lebn(out, dsa->pub_key, nbyte);
 633         else
 634                 write_lebn(out, dsa->priv_key, 20);
 635         /* Set "invalid" for seed structure values */
 636         memset(*out, 0xff, 24);
 637         *out += 24;
 638         return;
 639 }
 640
 641 int
 642 i2b_PrivateKey_bio(BIO *out, EVP_PKEY *pk)
 643 {
 644         return do_i2b_bio(out, pk, 0);
 645 }
 646
 647 int
 648 i2b_PublicKey_bio(BIO *out, EVP_PKEY *pk)
 649 {
 650         return do_i2b_bio(out, pk, 1);
 651 }
 652
 653 #ifndef OPENSSL_NO_RC4
 654
 655 static int
 656 do_PVK_header(const unsigned char **in, unsigned int length, int skip_magic,
 657     unsigned int *psaltlen, unsigned int *pkeylen)
 658 {
 659         const unsigned char *p = *in;
 660         unsigned int pvk_magic, is_encrypted;
 661
 662         if (skip_magic) {
 663                 if (length < 20) {
 664                         PEMerror(PEM_R_PVK_TOO_SHORT);
 665                         return 0;
 666                 }
 667                 length -= 20;
 668         } else {
 669                 if (length < 24) {
 670                         PEMerror(PEM_R_PVK_TOO_SHORT);
 671                         return 0;
 672                 }
 673                 length -= 24;
 674                 pvk_magic = read_ledword(&p);
 675                 if (pvk_magic != MS_PVKMAGIC) {
 676                         PEMerror(PEM_R_BAD_MAGIC_NUMBER);
 677                         return 0;
 678                 }
 679         }
 680         /* Skip reserved */
 681         p += 4;
 682         /*keytype = */read_ledword(&p);
 683         is_encrypted = read_ledword(&p);
 684         *psaltlen = read_ledword(&p);
 685         *pkeylen = read_ledword(&p);
 686         if (*psaltlen > 65536 || *pkeylen > 65536) {
 687                 PEMerror(PEM_R_ERROR_CONVERTING_PRIVATE_KEY);
 688                 return 0;
 689         }
 690
 691         if (is_encrypted && !*psaltlen) {
 692                 PEMerror(PEM_R_INCONSISTENT_HEADER);
 693                 return 0;
 694         }
 695
 696         *in = p;
 697         return 1;
 698 }
 699
 700 static int
 701 derive_pvk_key(unsigned char *key, const unsigned char *salt,
 702     unsigned int saltlen, const unsigned char *pass, int passlen)
 703 {
 704         EVP_MD_CTX mctx;
 705         int rv = 1;
 706
 707         EVP_MD_CTX_init(&mctx);
 708         if (!EVP_DigestInit_ex(&mctx, EVP_sha1(), NULL) ||
 709             !EVP_DigestUpdate(&mctx, salt, saltlen) ||
 710             !EVP_DigestUpdate(&mctx, pass, passlen) ||
 711             !EVP_DigestFinal_ex(&mctx, key, NULL))
 712                 rv = 0;
 713
 714         EVP_MD_CTX_cleanup(&mctx);
 715         return rv;
 716 }
 717
 718 static EVP_PKEY *
 719 do_PVK_body(const unsigned char **in, unsigned int saltlen,
 720     unsigned int keylen, pem_password_cb *cb, void *u)
 721 {
 722         EVP_PKEY *ret = NULL;
 723         const unsigned char *p = *in;
 724         unsigned int magic;
 725         unsigned char *enctmp = NULL, *q;
 726         EVP_CIPHER_CTX cctx;
 727
 728         EVP_CIPHER_CTX_init(&cctx);
 729         if (saltlen) {
 730                 char psbuf[PEM_BUFSIZE];
 731                 unsigned char keybuf[20];
 732                 int enctmplen, inlen;
 733
 734                 if (cb)
 735                         inlen = cb(psbuf, PEM_BUFSIZE, 0, u);
 736                 else
 737                         inlen = PEM_def_callback(psbuf, PEM_BUFSIZE, 0, u);
 738                 if (inlen <= 0) {
 739                         PEMerror(PEM_R_BAD_PASSWORD_READ);
 740                         goto err;
 741                 }
 742                 enctmp = malloc(keylen + 8);
 743                 if (!enctmp) {
 744                         PEMerror(ERR_R_MALLOC_FAILURE);
 745                         goto err;
 746                 }
 747                 if (!derive_pvk_key(keybuf, p, saltlen, (unsigned char *)psbuf,
 748                     inlen)) {
 749                         goto err;
 750                 }
 751                 p += saltlen;
 752                 /* Copy BLOBHEADER across, decrypt rest */
 753                 memcpy(enctmp, p, 8);
 754                 p += 8;
 755                 if (keylen < 8) {
 756                         PEMerror(PEM_R_PVK_TOO_SHORT);
 757                         goto err;
 758                 }
 759                 inlen = keylen - 8;
 760                 q = enctmp + 8;
 761                 if (!EVP_DecryptInit_ex(&cctx, EVP_rc4(), NULL, keybuf, NULL))
 762                         goto err;
 763                 if (!EVP_DecryptUpdate(&cctx, q, &enctmplen, p, inlen))
 764                         goto err;
 765                 if (!EVP_DecryptFinal_ex(&cctx, q + enctmplen, &enctmplen))
 766                         goto err;
 767                 magic = read_ledword((const unsigned char **)&q);
 768                 if (magic != MS_RSA2MAGIC && magic != MS_DSS2MAGIC) {
 769                         q = enctmp + 8;
 770                         memset(keybuf + 5, 0, 11);
 771                         if (!EVP_DecryptInit_ex(&cctx, EVP_rc4(), NULL, keybuf,
 772                             NULL))
 773                                 goto err;
 774                         explicit_bzero(keybuf, 20);
 775                         if (!EVP_DecryptUpdate(&cctx, q, &enctmplen, p, inlen))
 776                                 goto err;
 777                         if (!EVP_DecryptFinal_ex(&cctx, q + enctmplen,
 778                             &enctmplen))
 779                                 goto err;
 780                         magic = read_ledword((const unsigned char **)&q);
 781                         if (magic != MS_RSA2MAGIC && magic != MS_DSS2MAGIC) {
 782                                 PEMerror(PEM_R_BAD_DECRYPT);
 783                                 goto err;
 784                         }
 785                 } else
 786                         explicit_bzero(keybuf, 20);
 787                 p = enctmp;
 788         }
 789
 790         ret = b2i_PrivateKey(&p, keylen);
 791
 792 err:
 793         EVP_CIPHER_CTX_cleanup(&cctx);
 794         if (enctmp && saltlen)
 795                 free(enctmp);
 796         return ret;
 797 }
 798
 799
 800 EVP_PKEY *
 801 b2i_PVK_bio(BIO *in, pem_password_cb *cb, void *u)
 802 {
 803         unsigned char pvk_hdr[24], *buf = NULL;
 804         const unsigned char *p;
 805         size_t buflen;
 806         EVP_PKEY *ret = NULL;
 807         unsigned int saltlen, keylen;
 808
 809         if (BIO_read(in, pvk_hdr, 24) != 24) {
 810                 PEMerror(PEM_R_PVK_DATA_TOO_SHORT);
 811                 return NULL;
 812         }
 813         p = pvk_hdr;
 814
 815         if (!do_PVK_header(&p, 24, 0, &saltlen, &keylen))
 816                 return 0;
 817         buflen = keylen + saltlen;
 818         buf = malloc(buflen);
 819         if (!buf) {
 820                 PEMerror(ERR_R_MALLOC_FAILURE);
 821                 return 0;
 822         }
 823         p = buf;
 824         if (BIO_read(in, buf, buflen) != buflen) {
 825                 PEMerror(PEM_R_PVK_DATA_TOO_SHORT);
 826                 goto err;
 827         }
 828         ret = do_PVK_body(&p, saltlen, keylen, cb, u);
 829
 830 err:
 831         freezero(buf, buflen);
 832         return ret;
 833 }
 834
 835 static int
 836 i2b_PVK(unsigned char **out, EVP_PKEY*pk, int enclevel, pem_password_cb *cb,
 837     void *u)
 838 {
 839         int outlen = 24, pklen;
 840         unsigned char *p, *salt = NULL;
 841         EVP_CIPHER_CTX cctx;
 842
 843         EVP_CIPHER_CTX_init(&cctx);
 844         if (enclevel)
 845                 outlen += PVK_SALTLEN;
 846         pklen = do_i2b(NULL, pk, 0);
 847         if (pklen < 0)
 848                 return -1;
 849         outlen += pklen;
 850         if (!out)
 851                 return outlen;
 852         if (*out)
 853                 p = *out;
 854         else {
 855                 p = malloc(outlen);
 856                 if (!p) {
 857                         PEMerror(ERR_R_MALLOC_FAILURE);
 858                         return -1;
 859                 }
 860                 *out = p;
 861         }
 862
 863         write_ledword(&p, MS_PVKMAGIC);
 864         write_ledword(&p, 0);
 865         if (pk->type == EVP_PKEY_DSA)
 866                 write_ledword(&p, MS_KEYTYPE_SIGN);
 867         else
 868                 write_ledword(&p, MS_KEYTYPE_KEYX);
 869         write_ledword(&p, enclevel ? 1 : 0);
 870         write_ledword(&p, enclevel ? PVK_SALTLEN : 0);
 871         write_ledword(&p, pklen);
 872         if (enclevel) {
 873                 arc4random_buf(p, PVK_SALTLEN);
 874                 salt = p;
 875                 p += PVK_SALTLEN;
 876         }
 877         do_i2b(&p, pk, 0);
 878         if (enclevel == 0)
 879                 return outlen;
 880         else {
 881                 char psbuf[PEM_BUFSIZE];
 882                 unsigned char keybuf[20];
 883                 int enctmplen, inlen;
 884                 if (cb)
 885                         inlen = cb(psbuf, PEM_BUFSIZE, 1, u);
 886                 else
 887                         inlen = PEM_def_callback(psbuf, PEM_BUFSIZE, 1, u);
 888                 if (inlen <= 0) {
 889                         PEMerror(PEM_R_BAD_PASSWORD_READ);
 890                         goto error;
 891                 }
 892                 if (!derive_pvk_key(keybuf, salt, PVK_SALTLEN,
 893                     (unsigned char *)psbuf, inlen))
 894                         goto error;
 895                 if (enclevel == 1)
 896                         memset(keybuf + 5, 0, 11);
 897                 p = salt + PVK_SALTLEN + 8;
 898                 if (!EVP_EncryptInit_ex(&cctx, EVP_rc4(), NULL, keybuf, NULL))
 899                         goto error;
 900                 explicit_bzero(keybuf, 20);
 901                 if (!EVP_DecryptUpdate(&cctx, p, &enctmplen, p, pklen - 8))
 902                         goto error;
 903                 if (!EVP_DecryptFinal_ex(&cctx, p + enctmplen, &enctmplen))
 904                         goto error;
 905         }
 906         EVP_CIPHER_CTX_cleanup(&cctx);
 907         return outlen;
 908
 909 error:
 910         EVP_CIPHER_CTX_cleanup(&cctx);
 911         return -1;
 912 }
 913
 914 int
 915 i2b_PVK_bio(BIO *out, EVP_PKEY *pk, int enclevel, pem_password_cb *cb, void *u)
 916 {
 917         unsigned char *tmp = NULL;
 918         int outlen, wrlen;
 919
 920         outlen = i2b_PVK(&tmp, pk, enclevel, cb, u);
 921         if (outlen < 0)
 922                 return -1;
 923         wrlen = BIO_write(out, tmp, outlen);
 924         free(tmp);
 925         if (wrlen == outlen) {
 926                 PEMerror(PEM_R_BIO_WRITE_FAILURE);
 927                 return outlen;
 928         }
 929         return -1;
 930 }
 931
 932 #endif
 933
 934 #endif