crypto/pem/pvkfmt.c

   1 /*
   2  * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
   3  * 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 /*
  60  * Support for PVK format keys and related structures (such a PUBLICKEYBLOB
  61  * and PRIVATEKEYBLOB).
  62  */
  63
  64 #include "internal/cryptlib.h"
  65 #include <openssl/pem.h>
  66 #include <openssl/rand.h>
  67 #include <openssl/bn.h>
  68 #if !defined(OPENSSL_NO_RSA) && !defined(OPENSSL_NO_DSA)
  69 # include <openssl/dsa.h>
  70 # include <openssl/rsa.h>
  71
  72 /*
  73  * Utility function: read a DWORD (4 byte unsigned integer) in little endian
  74  * format
  75  */
  76
  77 static unsigned int read_ledword(const unsigned char **in)
  78 {
  79     const unsigned char *p = *in;
  80     unsigned int ret;
  81     ret = *p++;
  82     ret |= (*p++ << 8);
  83     ret |= (*p++ << 16);
  84     ret |= (*p++ << 24);
  85     *in = p;
  86     return ret;
  87 }
  88
  89 /*
  90  * Read a BIGNUM in little endian format. The docs say that this should take
  91  * up bitlen/8 bytes.
  92  */
  93
  94 static int read_lebn(const unsigned char **in, unsigned int nbyte, BIGNUM **r)
  95 {
  96     *r = BN_lebin2bn(*in, nbyte, NULL);
  97     if (*r == NULL)
  98         return 0;
  99     *in += nbyte;
 100     return 1;
 101 }
 102
 103 /* Convert private key blob to EVP_PKEY: RSA and DSA keys supported */
 104
 105 # define MS_PUBLICKEYBLOB        0x6
 106 # define MS_PRIVATEKEYBLOB       0x7
 107 # define MS_RSA1MAGIC            0x31415352L
 108 # define MS_RSA2MAGIC            0x32415352L
 109 # define MS_DSS1MAGIC            0x31535344L
 110 # define MS_DSS2MAGIC            0x32535344L
 111
 112 # define MS_KEYALG_RSA_KEYX      0xa400
 113 # define MS_KEYALG_DSS_SIGN      0x2200
 114
 115 # define MS_KEYTYPE_KEYX         0x1
 116 # define MS_KEYTYPE_SIGN         0x2
 117
 118 /* The PVK file magic number: seems to spell out "bobsfile", who is Bob? */
 119 # define MS_PVKMAGIC             0xb0b5f11eL
 120 /* Salt length for PVK files */
 121 # define PVK_SALTLEN             0x10
 122 /* Maximum length in PVK header */
 123 # define PVK_MAX_KEYLEN          102400
 124 /* Maximum salt length */
 125 # define PVK_MAX_SALTLEN         10240
 126
 127 static EVP_PKEY *b2i_rsa(const unsigned char **in,
 128                          unsigned int bitlen, int ispub);
 129 static EVP_PKEY *b2i_dss(const unsigned char **in,
 130                          unsigned int bitlen, int ispub);
 131
 132 static int do_blob_header(const unsigned char **in, unsigned int length,
 133                           unsigned int *pmagic, unsigned int *pbitlen,
 134                           int *pisdss, int *pispub)
 135 {
 136     const unsigned char *p = *in;
 137     if (length < 16)
 138         return 0;
 139     /* bType */
 140     if (*p == MS_PUBLICKEYBLOB) {
 141         if (*pispub == 0) {
 142             PEMerr(PEM_F_DO_BLOB_HEADER, PEM_R_EXPECTING_PRIVATE_KEY_BLOB);
 143             return 0;
 144         }
 145         *pispub = 1;
 146     } else if (*p == MS_PRIVATEKEYBLOB) {
 147         if (*pispub == 1) {
 148             PEMerr(PEM_F_DO_BLOB_HEADER, PEM_R_EXPECTING_PUBLIC_KEY_BLOB);
 149             return 0;
 150         }
 151         *pispub = 0;
 152     } else
 153         return 0;
 154     p++;
 155     /* Version */
 156     if (*p++ != 0x2) {
 157         PEMerr(PEM_F_DO_BLOB_HEADER, PEM_R_BAD_VERSION_NUMBER);
 158         return 0;
 159     }
 160     /* Ignore reserved, aiKeyAlg */
 161     p += 6;
 162     *pmagic = read_ledword(&p);
 163     *pbitlen = read_ledword(&p);
 164     *pisdss = 0;
 165     switch (*pmagic) {
 166
 167     case MS_DSS1MAGIC:
 168         *pisdss = 1;
 169     case MS_RSA1MAGIC:
 170         if (*pispub == 0) {
 171             PEMerr(PEM_F_DO_BLOB_HEADER, PEM_R_EXPECTING_PRIVATE_KEY_BLOB);
 172             return 0;
 173         }
 174         break;
 175
 176     case MS_DSS2MAGIC:
 177         *pisdss = 1;
 178     case MS_RSA2MAGIC:
 179         if (*pispub == 1) {
 180             PEMerr(PEM_F_DO_BLOB_HEADER, PEM_R_EXPECTING_PUBLIC_KEY_BLOB);
 181             return 0;
 182         }
 183         break;
 184
 185     default:
 186         PEMerr(PEM_F_DO_BLOB_HEADER, PEM_R_BAD_MAGIC_NUMBER);
 187         return -1;
 188     }
 189     *in = p;
 190     return 1;
 191 }
 192
 193 static unsigned int blob_length(unsigned bitlen, int isdss, int ispub)
 194 {
 195     unsigned int nbyte, hnbyte;
 196     nbyte = (bitlen + 7) >> 3;
 197     hnbyte = (bitlen + 15) >> 4;
 198     if (isdss) {
 199
 200         /*
 201          * Expected length: 20 for q + 3 components bitlen each + 24 for seed
 202          * structure.
 203          */
 204         if (ispub)
 205             return 44 + 3 * nbyte;
 206         /*
 207          * Expected length: 20 for q, priv, 2 bitlen components + 24 for seed
 208          * structure.
 209          */
 210         else
 211             return 64 + 2 * nbyte;
 212     } else {
 213         /* Expected length: 4 for 'e' + 'n' */
 214         if (ispub)
 215             return 4 + nbyte;
 216         else
 217             /*
 218              * Expected length: 4 for 'e' and 7 other components. 2
 219              * components are bitlen size, 5 are bitlen/2
 220              */
 221             return 4 + 2 * nbyte + 5 * hnbyte;
 222     }
 223
 224 }
 225
 226 static EVP_PKEY *do_b2i(const unsigned char **in, unsigned int length,
 227                         int ispub)
 228 {
 229     const unsigned char *p = *in;
 230     unsigned int bitlen, magic;
 231     int isdss;
 232     if (do_blob_header(&p, length, &magic, &bitlen, &isdss, &ispub) <= 0) {
 233         PEMerr(PEM_F_DO_B2I, PEM_R_KEYBLOB_HEADER_PARSE_ERROR);
 234         return NULL;
 235     }
 236     length -= 16;
 237     if (length < blob_length(bitlen, isdss, ispub)) {
 238         PEMerr(PEM_F_DO_B2I, PEM_R_KEYBLOB_TOO_SHORT);
 239         return NULL;
 240     }
 241     if (isdss)
 242         return b2i_dss(&p, bitlen, ispub);
 243     else
 244         return b2i_rsa(&p, bitlen, ispub);
 245 }
 246
 247 static EVP_PKEY *do_b2i_bio(BIO *in, int ispub)
 248 {
 249     const unsigned char *p;
 250     unsigned char hdr_buf[16], *buf = NULL;
 251     unsigned int bitlen, magic, length;
 252     int isdss;
 253     EVP_PKEY *ret = NULL;
 254     if (BIO_read(in, hdr_buf, 16) != 16) {
 255         PEMerr(PEM_F_DO_B2I_BIO, PEM_R_KEYBLOB_TOO_SHORT);
 256         return NULL;
 257     }
 258     p = hdr_buf;
 259     if (do_blob_header(&p, 16, &magic, &bitlen, &isdss, &ispub) <= 0)
 260         return NULL;
 261
 262     length = blob_length(bitlen, isdss, ispub);
 263     buf = OPENSSL_malloc(length);
 264     if (buf == NULL) {
 265         PEMerr(PEM_F_DO_B2I_BIO, ERR_R_MALLOC_FAILURE);
 266         goto err;
 267     }
 268     p = buf;
 269     if (BIO_read(in, buf, length) != (int)length) {
 270         PEMerr(PEM_F_DO_B2I_BIO, PEM_R_KEYBLOB_TOO_SHORT);
 271         goto err;
 272     }
 273
 274     if (isdss)
 275         ret = b2i_dss(&p, bitlen, ispub);
 276     else
 277         ret = b2i_rsa(&p, bitlen, ispub);
 278
 279  err:
 280     OPENSSL_free(buf);
 281     return ret;
 282 }
 283
 284 static EVP_PKEY *b2i_dss(const unsigned char **in,
 285                          unsigned int bitlen, int ispub)
 286 {
 287     const unsigned char *p = *in;
 288     EVP_PKEY *ret = NULL;
 289     DSA *dsa = NULL;
 290     BN_CTX *ctx = NULL;
 291     unsigned int nbyte;
 292     BIGNUM *pbn = NULL, *qbn = NULL, *gbn = NULL, *priv_key = NULL;
 293     BIGNUM *pub_key = NULL;
 294
 295     nbyte = (bitlen + 7) >> 3;
 296
 297     dsa = DSA_new();
 298     ret = EVP_PKEY_new();
 299     if (dsa == NULL || ret == NULL)
 300         goto memerr;
 301     if (!read_lebn(&p, nbyte, &pbn))
 302         goto memerr;
 303
 304     if (!read_lebn(&p, 20, &qbn))
 305         goto memerr;
 306
 307     if (!read_lebn(&p, nbyte, &gbn))
 308         goto memerr;
 309
 310     if (ispub) {
 311         if (!read_lebn(&p, nbyte, &pub_key))
 312             goto memerr;
 313     } else {
 314         if (!read_lebn(&p, 20, &priv_key))
 315             goto memerr;
 316
 317         /* Calculate public key */
 318         pub_key = BN_new();
 319         if (pub_key == NULL)
 320             goto memerr;
 321         if ((ctx = BN_CTX_new()) == NULL)
 322             goto memerr;
 323
 324         if (!BN_mod_exp(pub_key, gbn, priv_key, pbn, ctx))
 325             goto memerr;
 326
 327         BN_CTX_free(ctx);
 328     }
 329     if (!DSA_set0_pqg(dsa, pbn, qbn, gbn))
 330         goto memerr;
 331     pbn = qbn = gbn = NULL;
 332     if (!DSA_set0_key(dsa, pub_key, priv_key))
 333         goto memerr;
 334
 335     EVP_PKEY_set1_DSA(ret, dsa);
 336     DSA_free(dsa);
 337     *in = p;
 338     return ret;
 339
 340  memerr:
 341     PEMerr(PEM_F_B2I_DSS, ERR_R_MALLOC_FAILURE);
 342     DSA_free(dsa);
 343     BN_free(pbn);
 344     BN_free(qbn);
 345     BN_free(gbn);
 346     BN_free(pub_key);
 347     BN_free(priv_key);
 348     EVP_PKEY_free(ret);
 349     BN_CTX_free(ctx);
 350     return NULL;
 351 }
 352
 353 static EVP_PKEY *b2i_rsa(const unsigned char **in,
 354                          unsigned int bitlen, int ispub)
 355 {
 356     const unsigned char *p = *in;
 357     EVP_PKEY *ret = NULL;
 358     RSA *rsa = NULL;
 359     unsigned int nbyte, hnbyte;
 360     nbyte = (bitlen + 7) >> 3;
 361     hnbyte = (bitlen + 15) >> 4;
 362     rsa = RSA_new();
 363     ret = EVP_PKEY_new();
 364     if (rsa == NULL || ret == NULL)
 365         goto memerr;
 366     rsa->e = BN_new();
 367     if (rsa->e == NULL)
 368         goto memerr;
 369     if (!BN_set_word(rsa->e, read_ledword(&p)))
 370         goto memerr;
 371     if (!read_lebn(&p, nbyte, &rsa->n))
 372         goto memerr;
 373     if (!ispub) {
 374         if (!read_lebn(&p, hnbyte, &rsa->p))
 375             goto memerr;
 376         if (!read_lebn(&p, hnbyte, &rsa->q))
 377             goto memerr;
 378         if (!read_lebn(&p, hnbyte, &rsa->dmp1))
 379             goto memerr;
 380         if (!read_lebn(&p, hnbyte, &rsa->dmq1))
 381             goto memerr;
 382         if (!read_lebn(&p, hnbyte, &rsa->iqmp))
 383             goto memerr;
 384         if (!read_lebn(&p, nbyte, &rsa->d))
 385             goto memerr;
 386     }
 387
 388     EVP_PKEY_set1_RSA(ret, rsa);
 389     RSA_free(rsa);
 390     *in = p;
 391     return ret;
 392  memerr:
 393     PEMerr(PEM_F_B2I_RSA, ERR_R_MALLOC_FAILURE);
 394     RSA_free(rsa);
 395     EVP_PKEY_free(ret);
 396     return NULL;
 397 }
 398
 399 EVP_PKEY *b2i_PrivateKey(const unsigned char **in, long length)
 400 {
 401     return do_b2i(in, length, 0);
 402 }
 403
 404 EVP_PKEY *b2i_PublicKey(const unsigned char **in, long length)
 405 {
 406     return do_b2i(in, length, 1);
 407 }
 408
 409 EVP_PKEY *b2i_PrivateKey_bio(BIO *in)
 410 {
 411     return do_b2i_bio(in, 0);
 412 }
 413
 414 EVP_PKEY *b2i_PublicKey_bio(BIO *in)
 415 {
 416     return do_b2i_bio(in, 1);
 417 }
 418
 419 static void write_ledword(unsigned char **out, unsigned int dw)
 420 {
 421     unsigned char *p = *out;
 422     *p++ = dw & 0xff;
 423     *p++ = (dw >> 8) & 0xff;
 424     *p++ = (dw >> 16) & 0xff;
 425     *p++ = (dw >> 24) & 0xff;
 426     *out = p;
 427 }
 428
 429 static void write_lebn(unsigned char **out, const BIGNUM *bn, int len)
 430 {
 431     BN_bn2lebinpad(bn, *out, len);
 432     *out += len;
 433 }
 434
 435 static int check_bitlen_rsa(RSA *rsa, int ispub, unsigned int *magic);
 436 static int check_bitlen_dsa(DSA *dsa, int ispub, unsigned int *magic);
 437
 438 static void write_rsa(unsigned char **out, RSA *rsa, int ispub);
 439 static void write_dsa(unsigned char **out, DSA *dsa, int ispub);
 440
 441 static int do_i2b(unsigned char **out, EVP_PKEY *pk, int ispub)
 442 {
 443     unsigned char *p;
 444     unsigned int bitlen, magic = 0, keyalg;
 445     int outlen, noinc = 0;
 446     int pktype = EVP_PKEY_id(pk);
 447     if (pktype == EVP_PKEY_DSA) {
 448         bitlen = check_bitlen_dsa(EVP_PKEY_get0_DSA(pk), ispub, &magic);
 449         keyalg = MS_KEYALG_DSS_SIGN;
 450     } else if (pktype == EVP_PKEY_RSA) {
 451         bitlen = check_bitlen_rsa(EVP_PKEY_get0_RSA(pk), ispub, &magic);
 452         keyalg = MS_KEYALG_RSA_KEYX;
 453     } else
 454         return -1;
 455     if (bitlen == 0)
 456         return -1;
 457     outlen = 16 + blob_length(bitlen,
 458                               keyalg == MS_KEYALG_DSS_SIGN ? 1 : 0, ispub);
 459     if (out == NULL)
 460         return outlen;
 461     if (*out)
 462         p = *out;
 463     else {
 464         p = OPENSSL_malloc(outlen);
 465         if (p == NULL)
 466             return -1;
 467         *out = p;
 468         noinc = 1;
 469     }
 470     if (ispub)
 471         *p++ = MS_PUBLICKEYBLOB;
 472     else
 473         *p++ = MS_PRIVATEKEYBLOB;
 474     *p++ = 0x2;
 475     *p++ = 0;
 476     *p++ = 0;
 477     write_ledword(&p, keyalg);
 478     write_ledword(&p, magic);
 479     write_ledword(&p, bitlen);
 480     if (keyalg == MS_KEYALG_DSS_SIGN)
 481         write_dsa(&p, EVP_PKEY_get0_DSA(pk), ispub);
 482     else
 483         write_rsa(&p, EVP_PKEY_get0_RSA(pk), ispub);
 484     if (!noinc)
 485         *out += outlen;
 486     return outlen;
 487 }
 488
 489 static int do_i2b_bio(BIO *out, EVP_PKEY *pk, int ispub)
 490 {
 491     unsigned char *tmp = NULL;
 492     int outlen, wrlen;
 493     outlen = do_i2b(&tmp, pk, ispub);
 494     if (outlen < 0)
 495         return -1;
 496     wrlen = BIO_write(out, tmp, outlen);
 497     OPENSSL_free(tmp);
 498     if (wrlen == outlen)
 499         return outlen;
 500     return -1;
 501 }
 502
 503 static int check_bitlen_dsa(DSA *dsa, int ispub, unsigned int *pmagic)
 504 {
 505     int bitlen;
 506     bitlen = BN_num_bits(DSA_get0_p(dsa));
 507     if ((bitlen & 7) || (BN_num_bits(DSA_get0_q(dsa)) != 160)
 508         || (BN_num_bits(DSA_get0_g(dsa)) > bitlen))
 509         goto badkey;
 510     if (ispub) {
 511         if (BN_num_bits(DSA_get0_pub_key(dsa)) > bitlen)
 512             goto badkey;
 513         *pmagic = MS_DSS1MAGIC;
 514     } else {
 515         if (BN_num_bits(DSA_get0_priv_key(dsa)) > 160)
 516             goto badkey;
 517         *pmagic = MS_DSS2MAGIC;
 518     }
 519
 520     return bitlen;
 521  badkey:
 522     PEMerr(PEM_F_CHECK_BITLEN_DSA, PEM_R_UNSUPPORTED_KEY_COMPONENTS);
 523     return 0;
 524 }
 525
 526 static int check_bitlen_rsa(RSA *rsa, int ispub, unsigned int *pmagic)
 527 {
 528     int nbyte, hnbyte, bitlen;
 529     if (BN_num_bits(rsa->e) > 32)
 530         goto badkey;
 531     bitlen = BN_num_bits(rsa->n);
 532     nbyte = BN_num_bytes(rsa->n);
 533     hnbyte = (BN_num_bits(rsa->n) + 15) >> 4;
 534     if (ispub) {
 535         *pmagic = MS_RSA1MAGIC;
 536         return bitlen;
 537     } else {
 538         *pmagic = MS_RSA2MAGIC;
 539         /*
 540          * For private key each component must fit within nbyte or hnbyte.
 541          */
 542         if (BN_num_bytes(rsa->d) > nbyte)
 543             goto badkey;
 544         if ((BN_num_bytes(rsa->iqmp) > hnbyte)
 545             || (BN_num_bytes(rsa->p) > hnbyte)
 546             || (BN_num_bytes(rsa->q) > hnbyte)
 547             || (BN_num_bytes(rsa->dmp1) > hnbyte)
 548             || (BN_num_bytes(rsa->dmq1) > hnbyte))
 549             goto badkey;
 550     }
 551     return bitlen;
 552  badkey:
 553     PEMerr(PEM_F_CHECK_BITLEN_RSA, PEM_R_UNSUPPORTED_KEY_COMPONENTS);
 554     return 0;
 555 }
 556
 557 static void write_rsa(unsigned char **out, RSA *rsa, int ispub)
 558 {
 559     int nbyte, hnbyte;
 560     nbyte = BN_num_bytes(rsa->n);
 561     hnbyte = (BN_num_bits(rsa->n) + 15) >> 4;
 562     write_lebn(out, rsa->e, 4);
 563     write_lebn(out, rsa->n, -1);
 564     if (ispub)
 565         return;
 566     write_lebn(out, rsa->p, hnbyte);
 567     write_lebn(out, rsa->q, hnbyte);
 568     write_lebn(out, rsa->dmp1, hnbyte);
 569     write_lebn(out, rsa->dmq1, hnbyte);
 570     write_lebn(out, rsa->iqmp, hnbyte);
 571     write_lebn(out, rsa->d, nbyte);
 572 }
 573
 574 static void write_dsa(unsigned char **out, DSA *dsa, int ispub)
 575 {
 576     int nbyte;
 577     nbyte = BN_num_bytes(DSA_get0_p(dsa));
 578     write_lebn(out, DSA_get0_p(dsa), nbyte);
 579     write_lebn(out, DSA_get0_q(dsa), 20);
 580     write_lebn(out, DSA_get0_g(dsa), nbyte);
 581     if (ispub)
 582         write_lebn(out, DSA_get0_pub_key(dsa), nbyte);
 583     else
 584         write_lebn(out, DSA_get0_priv_key(dsa), 20);
 585     /* Set "invalid" for seed structure values */
 586     memset(*out, 0xff, 24);
 587     *out += 24;
 588     return;
 589 }
 590
 591 int i2b_PrivateKey_bio(BIO *out, EVP_PKEY *pk)
 592 {
 593     return do_i2b_bio(out, pk, 0);
 594 }
 595
 596 int i2b_PublicKey_bio(BIO *out, EVP_PKEY *pk)
 597 {
 598     return do_i2b_bio(out, pk, 1);
 599 }
 600
 601 # ifndef OPENSSL_NO_RC4
 602
 603 static int do_PVK_header(const unsigned char **in, unsigned int length,
 604                          int skip_magic,
 605                          unsigned int *psaltlen, unsigned int *pkeylen)
 606 {
 607     const unsigned char *p = *in;
 608     unsigned int pvk_magic, is_encrypted;
 609     if (skip_magic) {
 610         if (length < 20) {
 611             PEMerr(PEM_F_DO_PVK_HEADER, PEM_R_PVK_TOO_SHORT);
 612             return 0;
 613         }
 614     } else {
 615         if (length < 24) {
 616             PEMerr(PEM_F_DO_PVK_HEADER, PEM_R_PVK_TOO_SHORT);
 617             return 0;
 618         }
 619         pvk_magic = read_ledword(&p);
 620         if (pvk_magic != MS_PVKMAGIC) {
 621             PEMerr(PEM_F_DO_PVK_HEADER, PEM_R_BAD_MAGIC_NUMBER);
 622             return 0;
 623         }
 624     }
 625     /* Skip reserved */
 626     p += 4;
 627     /*
 628      * keytype =
 629      */ read_ledword(&p);
 630     is_encrypted = read_ledword(&p);
 631     *psaltlen = read_ledword(&p);
 632     *pkeylen = read_ledword(&p);
 633
 634     if (*pkeylen > PVK_MAX_KEYLEN || *psaltlen > PVK_MAX_SALTLEN)
 635         return 0;
 636
 637     if (is_encrypted && !*psaltlen) {
 638         PEMerr(PEM_F_DO_PVK_HEADER, PEM_R_INCONSISTENT_HEADER);
 639         return 0;
 640     }
 641
 642     *in = p;
 643     return 1;
 644 }
 645
 646 static int derive_pvk_key(unsigned char *key,
 647                           const unsigned char *salt, unsigned int saltlen,
 648                           const unsigned char *pass, int passlen)
 649 {
 650     EVP_MD_CTX *mctx = EVP_MD_CTX_new();
 651     int rv = 1;
 652     if (mctx == NULL
 653         || !EVP_DigestInit_ex(mctx, EVP_sha1(), NULL)
 654         || !EVP_DigestUpdate(mctx, salt, saltlen)
 655         || !EVP_DigestUpdate(mctx, pass, passlen)
 656         || !EVP_DigestFinal_ex(mctx, key, NULL))
 657         rv = 0;
 658
 659     EVP_MD_CTX_free(mctx);
 660     return rv;
 661 }
 662
 663 static EVP_PKEY *do_PVK_body(const unsigned char **in,
 664                              unsigned int saltlen, unsigned int keylen,
 665                              pem_password_cb *cb, void *u)
 666 {
 667     EVP_PKEY *ret = NULL;
 668     const unsigned char *p = *in;
 669     unsigned int magic;
 670     unsigned char *enctmp = NULL, *q;
 671
 672     EVP_CIPHER_CTX *cctx = EVP_CIPHER_CTX_new();
 673     if (saltlen) {
 674         char psbuf[PEM_BUFSIZE];
 675         unsigned char keybuf[20];
 676         int enctmplen, inlen;
 677         if (cb)
 678             inlen = cb(psbuf, PEM_BUFSIZE, 0, u);
 679         else
 680             inlen = PEM_def_callback(psbuf, PEM_BUFSIZE, 0, u);
 681         if (inlen <= 0) {
 682             PEMerr(PEM_F_DO_PVK_BODY, PEM_R_BAD_PASSWORD_READ);
 683             goto err;
 684         }
 685         enctmp = OPENSSL_malloc(keylen + 8);
 686         if (enctmp == NULL) {
 687             PEMerr(PEM_F_DO_PVK_BODY, ERR_R_MALLOC_FAILURE);
 688             goto err;
 689         }
 690         if (!derive_pvk_key(keybuf, p, saltlen,
 691                             (unsigned char *)psbuf, inlen))
 692             goto err;
 693         p += saltlen;
 694         /* Copy BLOBHEADER across, decrypt rest */
 695         memcpy(enctmp, p, 8);
 696         p += 8;
 697         if (keylen < 8) {
 698             PEMerr(PEM_F_DO_PVK_BODY, PEM_R_PVK_TOO_SHORT);
 699             goto err;
 700         }
 701         inlen = keylen - 8;
 702         q = enctmp + 8;
 703         if (!EVP_DecryptInit_ex(cctx, EVP_rc4(), NULL, keybuf, NULL))
 704             goto err;
 705         if (!EVP_DecryptUpdate(cctx, q, &enctmplen, p, inlen))
 706             goto err;
 707         if (!EVP_DecryptFinal_ex(cctx, q + enctmplen, &enctmplen))
 708             goto err;
 709         magic = read_ledword((const unsigned char **)&q);
 710         if (magic != MS_RSA2MAGIC && magic != MS_DSS2MAGIC) {
 711             q = enctmp + 8;
 712             memset(keybuf + 5, 0, 11);
 713             if (!EVP_DecryptInit_ex(cctx, EVP_rc4(), NULL, keybuf, NULL))
 714                 goto err;
 715             OPENSSL_cleanse(keybuf, 20);
 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                 PEMerr(PEM_F_DO_PVK_BODY, PEM_R_BAD_DECRYPT);
 723                 goto err;
 724             }
 725         } else
 726             OPENSSL_cleanse(keybuf, 20);
 727         p = enctmp;
 728     }
 729
 730     ret = b2i_PrivateKey(&p, keylen);
 731  err:
 732     EVP_CIPHER_CTX_free(cctx);
 733     OPENSSL_free(enctmp);
 734     return ret;
 735 }
 736
 737 EVP_PKEY *b2i_PVK_bio(BIO *in, pem_password_cb *cb, void *u)
 738 {
 739     unsigned char pvk_hdr[24], *buf = NULL;
 740     const unsigned char *p;
 741     int buflen;
 742     EVP_PKEY *ret = NULL;
 743     unsigned int saltlen, keylen;
 744     if (BIO_read(in, pvk_hdr, 24) != 24) {
 745         PEMerr(PEM_F_B2I_PVK_BIO, PEM_R_PVK_DATA_TOO_SHORT);
 746         return NULL;
 747     }
 748     p = pvk_hdr;
 749
 750     if (!do_PVK_header(&p, 24, 0, &saltlen, &keylen))
 751         return 0;
 752     buflen = (int)keylen + saltlen;
 753     buf = OPENSSL_malloc(buflen);
 754     if (buf == NULL) {
 755         PEMerr(PEM_F_B2I_PVK_BIO, ERR_R_MALLOC_FAILURE);
 756         return 0;
 757     }
 758     p = buf;
 759     if (BIO_read(in, buf, buflen) != buflen) {
 760         PEMerr(PEM_F_B2I_PVK_BIO, PEM_R_PVK_DATA_TOO_SHORT);
 761         goto err;
 762     }
 763     ret = do_PVK_body(&p, saltlen, keylen, cb, u);
 764
 765  err:
 766     OPENSSL_clear_free(buf, buflen);
 767     return ret;
 768 }
 769
 770 static int i2b_PVK(unsigned char **out, EVP_PKEY *pk, int enclevel,
 771                    pem_password_cb *cb, void *u)
 772 {
 773     int outlen = 24, pklen;
 774     unsigned char *p, *salt = NULL;
 775     EVP_CIPHER_CTX *cctx = EVP_CIPHER_CTX_new();
 776     if (enclevel)
 777         outlen += PVK_SALTLEN;
 778     pklen = do_i2b(NULL, pk, 0);
 779     if (pklen < 0)
 780         return -1;
 781     outlen += pklen;
 782     if (!out)
 783         return outlen;
 784     if (*out)
 785         p = *out;
 786     else {
 787         p = OPENSSL_malloc(outlen);
 788         if (p == NULL) {
 789             PEMerr(PEM_F_I2B_PVK, ERR_R_MALLOC_FAILURE);
 790             return -1;
 791         }
 792         *out = p;
 793     }
 794
 795     write_ledword(&p, MS_PVKMAGIC);
 796     write_ledword(&p, 0);
 797     if (EVP_PKEY_id(pk) == EVP_PKEY_DSA)
 798         write_ledword(&p, MS_KEYTYPE_SIGN);
 799     else
 800         write_ledword(&p, MS_KEYTYPE_KEYX);
 801     write_ledword(&p, enclevel ? 1 : 0);
 802     write_ledword(&p, enclevel ? PVK_SALTLEN : 0);
 803     write_ledword(&p, pklen);
 804     if (enclevel) {
 805         if (RAND_bytes(p, PVK_SALTLEN) <= 0)
 806             goto error;
 807         salt = p;
 808         p += PVK_SALTLEN;
 809     }
 810     do_i2b(&p, pk, 0);
 811     if (enclevel == 0)
 812         return outlen;
 813     else {
 814         char psbuf[PEM_BUFSIZE];
 815         unsigned char keybuf[20];
 816         int enctmplen, inlen;
 817         if (cb)
 818             inlen = cb(psbuf, PEM_BUFSIZE, 1, u);
 819         else
 820             inlen = PEM_def_callback(psbuf, PEM_BUFSIZE, 1, u);
 821         if (inlen <= 0) {
 822             PEMerr(PEM_F_I2B_PVK, PEM_R_BAD_PASSWORD_READ);
 823             goto error;
 824         }
 825         if (!derive_pvk_key(keybuf, salt, PVK_SALTLEN,
 826                             (unsigned char *)psbuf, inlen))
 827             goto error;
 828         if (enclevel == 1)
 829             memset(keybuf + 5, 0, 11);
 830         p = salt + PVK_SALTLEN + 8;
 831         if (!EVP_EncryptInit_ex(cctx, EVP_rc4(), NULL, keybuf, NULL))
 832             goto error;
 833         OPENSSL_cleanse(keybuf, 20);
 834         if (!EVP_DecryptUpdate(cctx, p, &enctmplen, p, pklen - 8))
 835             goto error;
 836         if (!EVP_DecryptFinal_ex(cctx, p + enctmplen, &enctmplen))
 837             goto error;
 838     }
 839     EVP_CIPHER_CTX_free(cctx);
 840     return outlen;
 841
 842  error:
 843     EVP_CIPHER_CTX_free(cctx);
 844     return -1;
 845 }
 846
 847 int i2b_PVK_bio(BIO *out, EVP_PKEY *pk, int enclevel,
 848                 pem_password_cb *cb, void *u)
 849 {
 850     unsigned char *tmp = NULL;
 851     int outlen, wrlen;
 852     outlen = i2b_PVK(&tmp, pk, enclevel, cb, u);
 853     if (outlen < 0)
 854         return -1;
 855     wrlen = BIO_write(out, tmp, outlen);
 856     OPENSSL_free(tmp);
 857     if (wrlen == outlen) {
 858         PEMerr(PEM_F_I2B_PVK_BIO, PEM_R_BIO_WRITE_FAILURE);
 859         return outlen;
 860     }
 861     return -1;
 862 }
 863
 864 # endif
 865
 866 #endif