Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 1 | /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL |
| 2 | * project 2005. |
| 3 | */ |
| 4 | /* ==================================================================== |
| 5 | * Copyright (c) 2005 The OpenSSL Project. All rights reserved. |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that the following conditions |
| 9 | * are met: |
| 10 | * |
| 11 | * 1. Redistributions of source code must retain the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer. |
| 13 | * |
| 14 | * 2. Redistributions in binary form must reproduce the above copyright |
| 15 | * notice, this list of conditions and the following disclaimer in |
| 16 | * the documentation and/or other materials provided with the |
| 17 | * distribution. |
| 18 | * |
| 19 | * 3. All advertising materials mentioning features or use of this |
| 20 | * software must display the following acknowledgment: |
| 21 | * "This product includes software developed by the OpenSSL Project |
| 22 | * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" |
| 23 | * |
| 24 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to |
| 25 | * endorse or promote products derived from this software without |
| 26 | * prior written permission. For written permission, please contact |
| 27 | * licensing@OpenSSL.org. |
| 28 | * |
| 29 | * 5. Products derived from this software may not be called "OpenSSL" |
| 30 | * nor may "OpenSSL" appear in their names without prior written |
| 31 | * permission of the OpenSSL Project. |
| 32 | * |
| 33 | * 6. Redistributions of any form whatsoever must retain the following |
| 34 | * acknowledgment: |
| 35 | * "This product includes software developed by the OpenSSL Project |
| 36 | * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" |
| 37 | * |
| 38 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY |
| 39 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 40 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 41 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR |
| 42 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 43 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 44 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| 45 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 46 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| 47 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 48 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
| 49 | * OF THE POSSIBILITY OF SUCH DAMAGE. |
| 50 | * ==================================================================== |
| 51 | * |
| 52 | * This product includes cryptographic software written by Eric Young |
| 53 | * (eay@cryptsoft.com). This product includes software written by Tim |
| 54 | * Hudson (tjh@cryptsoft.com). |
| 55 | * |
| 56 | */ |
| 57 | |
| 58 | /* Support for PVK format keys and related structures (such a PUBLICKEYBLOB |
| 59 | * and PRIVATEKEYBLOB). |
| 60 | */ |
| 61 | |
| 62 | #include "cryptlib.h" |
| 63 | #include <openssl/pem.h> |
| 64 | #include <openssl/rand.h> |
| 65 | #include <openssl/bn.h> |
| 66 | #if !defined(OPENSSL_NO_RSA) && !defined(OPENSSL_NO_DSA) |
| 67 | #include <openssl/dsa.h> |
| 68 | #include <openssl/rsa.h> |
| 69 | |
| 70 | /* Utility function: read a DWORD (4 byte unsigned integer) in little endian |
| 71 | * format |
| 72 | */ |
| 73 | |
| 74 | static unsigned int read_ledword(const unsigned char **in) |
| 75 | { |
| 76 | const unsigned char *p = *in; |
| 77 | unsigned int ret; |
| 78 | ret = *p++; |
| 79 | ret |= (*p++ << 8); |
| 80 | ret |= (*p++ << 16); |
| 81 | ret |= (*p++ << 24); |
| 82 | *in = p; |
| 83 | return ret; |
| 84 | } |
| 85 | |
| 86 | /* Read a BIGNUM in little endian format. The docs say that this should take up |
| 87 | * bitlen/8 bytes. |
| 88 | */ |
| 89 | |
| 90 | static int read_lebn(const unsigned char **in, unsigned int nbyte, BIGNUM **r) |
| 91 | { |
| 92 | const unsigned char *p; |
| 93 | unsigned char *tmpbuf, *q; |
| 94 | unsigned int i; |
| 95 | p = *in + nbyte - 1; |
| 96 | tmpbuf = OPENSSL_malloc(nbyte); |
| 97 | if (!tmpbuf) |
| 98 | return 0; |
| 99 | q = tmpbuf; |
| 100 | for (i = 0; i < nbyte; i++) |
| 101 | *q++ = *p--; |
| 102 | *r = BN_bin2bn(tmpbuf, nbyte, NULL); |
| 103 | OPENSSL_free(tmpbuf); |
| 104 | if (*r) |
| 105 | { |
| 106 | *in += nbyte; |
| 107 | return 1; |
| 108 | } |
| 109 | else |
| 110 | return 0; |
| 111 | } |
| 112 | |
| 113 | |
| 114 | /* Convert private key blob to EVP_PKEY: RSA and DSA keys supported */ |
| 115 | |
| 116 | #define MS_PUBLICKEYBLOB 0x6 |
| 117 | #define MS_PRIVATEKEYBLOB 0x7 |
| 118 | #define MS_RSA1MAGIC 0x31415352L |
| 119 | #define MS_RSA2MAGIC 0x32415352L |
| 120 | #define MS_DSS1MAGIC 0x31535344L |
| 121 | #define MS_DSS2MAGIC 0x32535344L |
| 122 | |
| 123 | #define MS_KEYALG_RSA_KEYX 0xa400 |
| 124 | #define MS_KEYALG_DSS_SIGN 0x2200 |
| 125 | |
| 126 | #define MS_KEYTYPE_KEYX 0x1 |
| 127 | #define MS_KEYTYPE_SIGN 0x2 |
| 128 | |
| 129 | /* The PVK file magic number: seems to spell out "bobsfile", who is Bob? */ |
| 130 | #define MS_PVKMAGIC 0xb0b5f11eL |
| 131 | /* Salt length for PVK files */ |
| 132 | #define PVK_SALTLEN 0x10 |
| 133 | |
| 134 | static EVP_PKEY *b2i_rsa(const unsigned char **in, unsigned int length, |
| 135 | unsigned int bitlen, int ispub); |
| 136 | static EVP_PKEY *b2i_dss(const unsigned char **in, unsigned int length, |
| 137 | unsigned int bitlen, int ispub); |
| 138 | |
| 139 | static int do_blob_header(const unsigned char **in, unsigned int length, |
| 140 | unsigned int *pmagic, unsigned int *pbitlen, |
| 141 | int *pisdss, int *pispub) |
| 142 | { |
| 143 | const unsigned char *p = *in; |
| 144 | if (length < 16) |
| 145 | return 0; |
| 146 | /* bType */ |
| 147 | if (*p == MS_PUBLICKEYBLOB) |
| 148 | { |
| 149 | if (*pispub == 0) |
| 150 | { |
| 151 | PEMerr(PEM_F_DO_BLOB_HEADER, |
| 152 | PEM_R_EXPECTING_PRIVATE_KEY_BLOB); |
| 153 | return 0; |
| 154 | } |
| 155 | *pispub = 1; |
| 156 | } |
| 157 | else if (*p == MS_PRIVATEKEYBLOB) |
| 158 | { |
| 159 | if (*pispub == 1) |
| 160 | { |
| 161 | PEMerr(PEM_F_DO_BLOB_HEADER, |
| 162 | PEM_R_EXPECTING_PUBLIC_KEY_BLOB); |
| 163 | return 0; |
| 164 | } |
| 165 | *pispub = 0; |
| 166 | } |
| 167 | else |
| 168 | return 0; |
| 169 | p++; |
| 170 | /* Version */ |
| 171 | if (*p++ != 0x2) |
| 172 | { |
| 173 | PEMerr(PEM_F_DO_BLOB_HEADER, PEM_R_BAD_VERSION_NUMBER); |
| 174 | return 0; |
| 175 | } |
| 176 | /* Ignore reserved, aiKeyAlg */ |
| 177 | p+= 6; |
| 178 | *pmagic = read_ledword(&p); |
| 179 | *pbitlen = read_ledword(&p); |
| 180 | *pisdss = 0; |
| 181 | switch (*pmagic) |
| 182 | { |
| 183 | |
| 184 | case MS_DSS1MAGIC: |
| 185 | *pisdss = 1; |
| 186 | case MS_RSA1MAGIC: |
| 187 | if (*pispub == 0) |
| 188 | { |
| 189 | PEMerr(PEM_F_DO_BLOB_HEADER, |
| 190 | PEM_R_EXPECTING_PRIVATE_KEY_BLOB); |
| 191 | return 0; |
| 192 | } |
| 193 | break; |
| 194 | |
| 195 | case MS_DSS2MAGIC: |
| 196 | *pisdss = 1; |
| 197 | case MS_RSA2MAGIC: |
| 198 | if (*pispub == 1) |
| 199 | { |
| 200 | PEMerr(PEM_F_DO_BLOB_HEADER, |
| 201 | PEM_R_EXPECTING_PUBLIC_KEY_BLOB); |
| 202 | return 0; |
| 203 | } |
| 204 | break; |
| 205 | |
| 206 | default: |
| 207 | PEMerr(PEM_F_DO_BLOB_HEADER, PEM_R_BAD_MAGIC_NUMBER); |
| 208 | return -1; |
| 209 | } |
| 210 | *in = p; |
| 211 | return 1; |
| 212 | } |
| 213 | |
| 214 | static unsigned int blob_length(unsigned bitlen, int isdss, int ispub) |
| 215 | { |
| 216 | unsigned int nbyte, hnbyte; |
| 217 | nbyte = (bitlen + 7) >> 3; |
| 218 | hnbyte = (bitlen + 15) >> 4; |
| 219 | if (isdss) |
| 220 | { |
| 221 | |
| 222 | /* Expected length: 20 for q + 3 components bitlen each + 24 |
| 223 | * for seed structure. |
| 224 | */ |
| 225 | if (ispub) |
| 226 | return 44 + 3 * nbyte; |
| 227 | /* Expected length: 20 for q, priv, 2 bitlen components + 24 |
| 228 | * for seed structure. |
| 229 | */ |
| 230 | else |
| 231 | return 64 + 2 * nbyte; |
| 232 | } |
| 233 | else |
| 234 | { |
| 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 *do_b2i(const unsigned char **in, unsigned int length, |
| 248 | int ispub) |
| 249 | { |
| 250 | const unsigned char *p = *in; |
| 251 | unsigned int bitlen, magic; |
| 252 | int isdss; |
| 253 | if (do_blob_header(&p, length, &magic, &bitlen, &isdss, &ispub) <= 0) |
| 254 | { |
| 255 | PEMerr(PEM_F_DO_B2I, PEM_R_KEYBLOB_HEADER_PARSE_ERROR); |
| 256 | return NULL; |
| 257 | } |
| 258 | length -= 16; |
| 259 | if (length < blob_length(bitlen, isdss, ispub)) |
| 260 | { |
| 261 | PEMerr(PEM_F_DO_B2I, PEM_R_KEYBLOB_TOO_SHORT); |
| 262 | return NULL; |
| 263 | } |
| 264 | if (isdss) |
| 265 | return b2i_dss(&p, length, bitlen, ispub); |
| 266 | else |
| 267 | return b2i_rsa(&p, length, bitlen, ispub); |
| 268 | } |
| 269 | |
| 270 | static EVP_PKEY *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 | if (BIO_read(in, hdr_buf, 16) != 16) |
| 278 | { |
| 279 | PEMerr(PEM_F_DO_B2I_BIO, 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 = OPENSSL_malloc(length); |
| 288 | if (!buf) |
| 289 | { |
| 290 | PEMerr(PEM_F_DO_B2I_BIO, ERR_R_MALLOC_FAILURE); |
| 291 | goto err; |
| 292 | } |
| 293 | p = buf; |
| 294 | if (BIO_read(in, buf, length) != (int)length) |
| 295 | { |
| 296 | PEMerr(PEM_F_DO_B2I_BIO, PEM_R_KEYBLOB_TOO_SHORT); |
| 297 | goto err; |
| 298 | } |
| 299 | |
| 300 | if (isdss) |
| 301 | ret = b2i_dss(&p, length, bitlen, ispub); |
| 302 | else |
| 303 | ret = b2i_rsa(&p, length, bitlen, ispub); |
| 304 | |
| 305 | err: |
| 306 | if (buf) |
| 307 | OPENSSL_free(buf); |
| 308 | return ret; |
| 309 | } |
| 310 | |
| 311 | static EVP_PKEY *b2i_dss(const unsigned char **in, unsigned int length, |
| 312 | unsigned int bitlen, int ispub) |
| 313 | { |
| 314 | const unsigned char *p = *in; |
| 315 | EVP_PKEY *ret = NULL; |
| 316 | DSA *dsa = NULL; |
| 317 | BN_CTX *ctx = NULL; |
| 318 | unsigned int nbyte; |
| 319 | nbyte = (bitlen + 7) >> 3; |
| 320 | |
| 321 | dsa = DSA_new(); |
| 322 | ret = EVP_PKEY_new(); |
| 323 | if (!dsa || !ret) |
| 324 | goto memerr; |
| 325 | if (!read_lebn(&p, nbyte, &dsa->p)) |
| 326 | goto memerr; |
| 327 | if (!read_lebn(&p, 20, &dsa->q)) |
| 328 | goto memerr; |
| 329 | if (!read_lebn(&p, nbyte, &dsa->g)) |
| 330 | goto memerr; |
| 331 | if (ispub) |
| 332 | { |
| 333 | if (!read_lebn(&p, nbyte, &dsa->pub_key)) |
| 334 | goto memerr; |
| 335 | } |
| 336 | else |
| 337 | { |
| 338 | if (!read_lebn(&p, 20, &dsa->priv_key)) |
| 339 | goto memerr; |
| 340 | /* Calculate public key */ |
| 341 | if (!(dsa->pub_key = BN_new())) |
| 342 | goto memerr; |
| 343 | if (!(ctx = BN_CTX_new())) |
| 344 | goto memerr; |
| 345 | |
| 346 | if (!BN_mod_exp(dsa->pub_key, dsa->g, |
| 347 | dsa->priv_key, dsa->p, ctx)) |
| 348 | |
| 349 | goto memerr; |
| 350 | BN_CTX_free(ctx); |
| 351 | } |
| 352 | |
| 353 | EVP_PKEY_set1_DSA(ret, dsa); |
| 354 | DSA_free(dsa); |
| 355 | *in = p; |
| 356 | return ret; |
| 357 | |
| 358 | memerr: |
| 359 | PEMerr(PEM_F_B2I_DSS, ERR_R_MALLOC_FAILURE); |
| 360 | if (dsa) |
| 361 | DSA_free(dsa); |
| 362 | if (ret) |
| 363 | EVP_PKEY_free(ret); |
| 364 | if (ctx) |
| 365 | BN_CTX_free(ctx); |
| 366 | return NULL; |
| 367 | } |
| 368 | |
| 369 | static EVP_PKEY *b2i_rsa(const unsigned char **in, unsigned int length, |
| 370 | unsigned int bitlen, int ispub) |
| 371 | |
| 372 | { |
| 373 | const unsigned char *p = *in; |
| 374 | EVP_PKEY *ret = NULL; |
| 375 | RSA *rsa = NULL; |
| 376 | unsigned int nbyte, hnbyte; |
| 377 | nbyte = (bitlen + 7) >> 3; |
| 378 | hnbyte = (bitlen + 15) >> 4; |
| 379 | rsa = RSA_new(); |
| 380 | ret = EVP_PKEY_new(); |
| 381 | if (!rsa || !ret) |
| 382 | goto memerr; |
| 383 | rsa->e = BN_new(); |
| 384 | if (!rsa->e) |
| 385 | goto memerr; |
| 386 | if (!BN_set_word(rsa->e, read_ledword(&p))) |
| 387 | goto memerr; |
| 388 | if (!read_lebn(&p, nbyte, &rsa->n)) |
| 389 | goto memerr; |
| 390 | if (!ispub) |
| 391 | { |
| 392 | if (!read_lebn(&p, hnbyte, &rsa->p)) |
| 393 | goto memerr; |
| 394 | if (!read_lebn(&p, hnbyte, &rsa->q)) |
| 395 | goto memerr; |
| 396 | if (!read_lebn(&p, hnbyte, &rsa->dmp1)) |
| 397 | goto memerr; |
| 398 | if (!read_lebn(&p, hnbyte, &rsa->dmq1)) |
| 399 | goto memerr; |
| 400 | if (!read_lebn(&p, hnbyte, &rsa->iqmp)) |
| 401 | goto memerr; |
| 402 | if (!read_lebn(&p, nbyte, &rsa->d)) |
| 403 | goto memerr; |
| 404 | } |
| 405 | |
| 406 | EVP_PKEY_set1_RSA(ret, rsa); |
| 407 | RSA_free(rsa); |
| 408 | *in = p; |
| 409 | return ret; |
| 410 | memerr: |
| 411 | PEMerr(PEM_F_B2I_RSA, ERR_R_MALLOC_FAILURE); |
| 412 | if (rsa) |
| 413 | RSA_free(rsa); |
| 414 | if (ret) |
| 415 | EVP_PKEY_free(ret); |
| 416 | return NULL; |
| 417 | } |
| 418 | |
| 419 | EVP_PKEY *b2i_PrivateKey(const unsigned char **in, long length) |
| 420 | { |
| 421 | return do_b2i(in, length, 0); |
| 422 | } |
| 423 | |
| 424 | EVP_PKEY *b2i_PublicKey(const unsigned char **in, long length) |
| 425 | { |
| 426 | return do_b2i(in, length, 1); |
| 427 | } |
| 428 | |
| 429 | |
| 430 | EVP_PKEY *b2i_PrivateKey_bio(BIO *in) |
| 431 | { |
| 432 | return do_b2i_bio(in, 0); |
| 433 | } |
| 434 | |
| 435 | EVP_PKEY *b2i_PublicKey_bio(BIO *in) |
| 436 | { |
| 437 | return do_b2i_bio(in, 1); |
| 438 | } |
| 439 | |
| 440 | static void write_ledword(unsigned char **out, unsigned int dw) |
| 441 | { |
| 442 | unsigned char *p = *out; |
| 443 | *p++ = dw & 0xff; |
| 444 | *p++ = (dw>>8) & 0xff; |
| 445 | *p++ = (dw>>16) & 0xff; |
| 446 | *p++ = (dw>>24) & 0xff; |
| 447 | *out = p; |
| 448 | } |
| 449 | |
| 450 | static void write_lebn(unsigned char **out, const BIGNUM *bn, int len) |
| 451 | { |
| 452 | int nb, i; |
| 453 | unsigned char *p = *out, *q, c; |
| 454 | nb = BN_num_bytes(bn); |
| 455 | BN_bn2bin(bn, p); |
| 456 | q = p + nb - 1; |
| 457 | /* In place byte order reversal */ |
| 458 | for (i = 0; i < nb/2; i++) |
| 459 | { |
| 460 | c = *p; |
| 461 | *p++ = *q; |
| 462 | *q-- = c; |
| 463 | } |
| 464 | *out += nb; |
| 465 | /* Pad with zeroes if we have to */ |
| 466 | if (len > 0) |
| 467 | { |
| 468 | len -= nb; |
| 469 | if (len > 0) |
| 470 | { |
| 471 | memset(*out, 0, len); |
| 472 | *out += len; |
| 473 | } |
| 474 | } |
| 475 | } |
| 476 | |
| 477 | |
| 478 | static int check_bitlen_rsa(RSA *rsa, int ispub, unsigned int *magic); |
| 479 | static int check_bitlen_dsa(DSA *dsa, int ispub, unsigned int *magic); |
| 480 | |
| 481 | static void write_rsa(unsigned char **out, RSA *rsa, int ispub); |
| 482 | static void write_dsa(unsigned char **out, DSA *dsa, int ispub); |
| 483 | |
| 484 | static int do_i2b(unsigned char **out, EVP_PKEY *pk, int ispub) |
| 485 | { |
| 486 | unsigned char *p; |
| 487 | unsigned int bitlen, magic = 0, keyalg; |
| 488 | int outlen, noinc = 0; |
| 489 | if (pk->type == EVP_PKEY_DSA) |
| 490 | { |
| 491 | bitlen = check_bitlen_dsa(pk->pkey.dsa, ispub, &magic); |
| 492 | keyalg = MS_KEYALG_DSS_SIGN; |
| 493 | } |
| 494 | else if (pk->type == EVP_PKEY_RSA) |
| 495 | { |
| 496 | bitlen = check_bitlen_rsa(pk->pkey.rsa, ispub, &magic); |
| 497 | keyalg = MS_KEYALG_RSA_KEYX; |
| 498 | } |
| 499 | else |
| 500 | return -1; |
| 501 | if (bitlen == 0) |
| 502 | return -1; |
| 503 | outlen = 16 + blob_length(bitlen, |
| 504 | keyalg == MS_KEYALG_DSS_SIGN ? 1 : 0, ispub); |
| 505 | if (out == NULL) |
| 506 | return outlen; |
| 507 | if (*out) |
| 508 | p = *out; |
| 509 | else |
| 510 | { |
| 511 | p = OPENSSL_malloc(outlen); |
| 512 | if (!p) |
| 513 | return -1; |
| 514 | *out = p; |
| 515 | noinc = 1; |
| 516 | } |
| 517 | if (ispub) |
| 518 | *p++ = MS_PUBLICKEYBLOB; |
| 519 | else |
| 520 | *p++ = MS_PRIVATEKEYBLOB; |
| 521 | *p++ = 0x2; |
| 522 | *p++ = 0; |
| 523 | *p++ = 0; |
| 524 | write_ledword(&p, keyalg); |
| 525 | write_ledword(&p, magic); |
| 526 | write_ledword(&p, bitlen); |
| 527 | if (keyalg == MS_KEYALG_DSS_SIGN) |
| 528 | write_dsa(&p, pk->pkey.dsa, ispub); |
| 529 | else |
| 530 | write_rsa(&p, pk->pkey.rsa, ispub); |
| 531 | if (!noinc) |
| 532 | *out += outlen; |
| 533 | return outlen; |
| 534 | } |
| 535 | |
| 536 | static int do_i2b_bio(BIO *out, EVP_PKEY *pk, int ispub) |
| 537 | { |
| 538 | unsigned char *tmp = NULL; |
| 539 | int outlen, wrlen; |
| 540 | outlen = do_i2b(&tmp, pk, ispub); |
| 541 | if (outlen < 0) |
| 542 | return -1; |
| 543 | wrlen = BIO_write(out, tmp, outlen); |
| 544 | OPENSSL_free(tmp); |
| 545 | if (wrlen == outlen) |
| 546 | return outlen; |
| 547 | return -1; |
| 548 | } |
| 549 | |
| 550 | static int check_bitlen_dsa(DSA *dsa, int ispub, unsigned int *pmagic) |
| 551 | { |
| 552 | int bitlen; |
| 553 | bitlen = BN_num_bits(dsa->p); |
| 554 | if ((bitlen & 7) || (BN_num_bits(dsa->q) != 160) |
| 555 | || (BN_num_bits(dsa->g) > bitlen)) |
| 556 | goto badkey; |
| 557 | if (ispub) |
| 558 | { |
| 559 | if (BN_num_bits(dsa->pub_key) > bitlen) |
| 560 | goto badkey; |
| 561 | *pmagic = MS_DSS1MAGIC; |
| 562 | } |
| 563 | else |
| 564 | { |
| 565 | if (BN_num_bits(dsa->priv_key) > 160) |
| 566 | goto badkey; |
| 567 | *pmagic = MS_DSS2MAGIC; |
| 568 | } |
| 569 | |
| 570 | return bitlen; |
| 571 | badkey: |
| 572 | PEMerr(PEM_F_CHECK_BITLEN_DSA, PEM_R_UNSUPPORTED_KEY_COMPONENTS); |
| 573 | return 0; |
| 574 | } |
| 575 | |
| 576 | static int check_bitlen_rsa(RSA *rsa, int ispub, unsigned int *pmagic) |
| 577 | { |
| 578 | int nbyte, hnbyte, bitlen; |
| 579 | if (BN_num_bits(rsa->e) > 32) |
| 580 | goto badkey; |
| 581 | bitlen = BN_num_bits(rsa->n); |
| 582 | nbyte = BN_num_bytes(rsa->n); |
| 583 | hnbyte = (BN_num_bits(rsa->n) + 15) >> 4; |
| 584 | if (ispub) |
| 585 | { |
| 586 | *pmagic = MS_RSA1MAGIC; |
| 587 | return bitlen; |
| 588 | } |
| 589 | else |
| 590 | { |
| 591 | *pmagic = MS_RSA2MAGIC; |
| 592 | /* For private key each component must fit within nbyte or |
| 593 | * hnbyte. |
| 594 | */ |
| 595 | if (BN_num_bytes(rsa->d) > nbyte) |
| 596 | goto badkey; |
| 597 | if ((BN_num_bytes(rsa->iqmp) > hnbyte) |
| 598 | || (BN_num_bytes(rsa->p) > hnbyte) |
| 599 | || (BN_num_bytes(rsa->q) > hnbyte) |
| 600 | || (BN_num_bytes(rsa->dmp1) > hnbyte) |
| 601 | || (BN_num_bytes(rsa->dmq1) > hnbyte)) |
| 602 | goto badkey; |
| 603 | } |
| 604 | return bitlen; |
| 605 | badkey: |
| 606 | PEMerr(PEM_F_CHECK_BITLEN_RSA, PEM_R_UNSUPPORTED_KEY_COMPONENTS); |
| 607 | return 0; |
| 608 | } |
| 609 | |
| 610 | |
| 611 | static void write_rsa(unsigned char **out, RSA *rsa, int ispub) |
| 612 | { |
| 613 | int nbyte, hnbyte; |
| 614 | nbyte = BN_num_bytes(rsa->n); |
| 615 | hnbyte = (BN_num_bits(rsa->n) + 15) >> 4; |
| 616 | write_lebn(out, rsa->e, 4); |
| 617 | write_lebn(out, rsa->n, -1); |
| 618 | if (ispub) |
| 619 | return; |
| 620 | write_lebn(out, rsa->p, hnbyte); |
| 621 | write_lebn(out, rsa->q, hnbyte); |
| 622 | write_lebn(out, rsa->dmp1, hnbyte); |
| 623 | write_lebn(out, rsa->dmq1, hnbyte); |
| 624 | write_lebn(out, rsa->iqmp, hnbyte); |
| 625 | write_lebn(out, rsa->d, nbyte); |
| 626 | } |
| 627 | |
| 628 | |
| 629 | static void write_dsa(unsigned char **out, DSA *dsa, int ispub) |
| 630 | { |
| 631 | int nbyte; |
| 632 | nbyte = BN_num_bytes(dsa->p); |
| 633 | write_lebn(out, dsa->p, nbyte); |
| 634 | write_lebn(out, dsa->q, 20); |
| 635 | write_lebn(out, dsa->g, nbyte); |
| 636 | if (ispub) |
| 637 | write_lebn(out, dsa->pub_key, nbyte); |
| 638 | else |
| 639 | write_lebn(out, dsa->priv_key, 20); |
| 640 | /* Set "invalid" for seed structure values */ |
| 641 | memset(*out, 0xff, 24); |
| 642 | *out += 24; |
| 643 | return; |
| 644 | } |
| 645 | |
| 646 | |
| 647 | int i2b_PrivateKey_bio(BIO *out, EVP_PKEY *pk) |
| 648 | { |
| 649 | return do_i2b_bio(out, pk, 0); |
| 650 | } |
| 651 | |
| 652 | int i2b_PublicKey_bio(BIO *out, EVP_PKEY *pk) |
| 653 | { |
| 654 | return do_i2b_bio(out, pk, 1); |
| 655 | } |
| 656 | |
| 657 | #ifndef OPENSSL_NO_RC4 |
| 658 | |
| 659 | static int do_PVK_header(const unsigned char **in, unsigned int length, |
| 660 | int skip_magic, |
| 661 | unsigned int *psaltlen, unsigned int *pkeylen) |
| 662 | |
| 663 | { |
| 664 | const unsigned char *p = *in; |
| 665 | unsigned int pvk_magic, is_encrypted; |
| 666 | if (skip_magic) |
| 667 | { |
| 668 | if (length < 20) |
| 669 | { |
| 670 | PEMerr(PEM_F_DO_PVK_HEADER, PEM_R_PVK_TOO_SHORT); |
| 671 | return 0; |
| 672 | } |
| 673 | length -= 20; |
| 674 | } |
| 675 | else |
| 676 | { |
| 677 | if (length < 24) |
| 678 | { |
| 679 | PEMerr(PEM_F_DO_PVK_HEADER, PEM_R_PVK_TOO_SHORT); |
| 680 | return 0; |
| 681 | } |
| 682 | length -= 24; |
| 683 | pvk_magic = read_ledword(&p); |
| 684 | if (pvk_magic != MS_PVKMAGIC) |
| 685 | { |
| 686 | PEMerr(PEM_F_DO_PVK_HEADER, PEM_R_BAD_MAGIC_NUMBER); |
| 687 | return 0; |
| 688 | } |
| 689 | } |
| 690 | /* Skip reserved */ |
| 691 | p += 4; |
| 692 | /*keytype = */read_ledword(&p); |
| 693 | is_encrypted = read_ledword(&p); |
| 694 | *psaltlen = read_ledword(&p); |
| 695 | *pkeylen = read_ledword(&p); |
| 696 | |
| 697 | if (is_encrypted && !*psaltlen) |
| 698 | { |
| 699 | PEMerr(PEM_F_DO_PVK_HEADER, PEM_R_INCONSISTENT_HEADER); |
| 700 | return 0; |
| 701 | } |
| 702 | |
| 703 | *in = p; |
| 704 | return 1; |
| 705 | } |
| 706 | |
| 707 | static int derive_pvk_key(unsigned char *key, |
| 708 | const unsigned char *salt, unsigned int saltlen, |
| 709 | const unsigned char *pass, int passlen) |
| 710 | { |
| 711 | EVP_MD_CTX mctx; |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 712 | EVP_MD_CTX_init(&mctx); |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 713 | EVP_DigestInit_ex(&mctx, EVP_sha1(), NULL); |
| 714 | EVP_DigestUpdate(&mctx, salt, saltlen); |
| 715 | EVP_DigestUpdate(&mctx, pass, passlen); |
| 716 | EVP_DigestFinal_ex(&mctx, key, NULL); |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 717 | EVP_MD_CTX_cleanup(&mctx); |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 718 | return 1; |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 719 | } |
| 720 | |
| 721 | |
| 722 | static EVP_PKEY *do_PVK_body(const unsigned char **in, |
| 723 | unsigned int saltlen, unsigned int keylen, |
| 724 | pem_password_cb *cb, void *u) |
| 725 | { |
| 726 | EVP_PKEY *ret = NULL; |
| 727 | const unsigned char *p = *in; |
| 728 | unsigned int magic; |
| 729 | unsigned char *enctmp = NULL, *q; |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 730 | if (saltlen) |
| 731 | { |
| 732 | char psbuf[PEM_BUFSIZE]; |
| 733 | unsigned char keybuf[20]; |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 734 | EVP_CIPHER_CTX cctx; |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 735 | int enctmplen, inlen; |
| 736 | if (cb) |
| 737 | inlen=cb(psbuf,PEM_BUFSIZE,0,u); |
| 738 | else |
| 739 | inlen=PEM_def_callback(psbuf,PEM_BUFSIZE,0,u); |
| 740 | if (inlen <= 0) |
| 741 | { |
| 742 | PEMerr(PEM_F_DO_PVK_BODY,PEM_R_BAD_PASSWORD_READ); |
| 743 | return NULL; |
| 744 | } |
| 745 | enctmp = OPENSSL_malloc(keylen + 8); |
| 746 | if (!enctmp) |
| 747 | { |
| 748 | PEMerr(PEM_F_DO_PVK_BODY, ERR_R_MALLOC_FAILURE); |
| 749 | return NULL; |
| 750 | } |
| 751 | if (!derive_pvk_key(keybuf, p, saltlen, |
| 752 | (unsigned char *)psbuf, inlen)) |
| 753 | return NULL; |
| 754 | p += saltlen; |
| 755 | /* Copy BLOBHEADER across, decrypt rest */ |
| 756 | memcpy(enctmp, p, 8); |
| 757 | p += 8; |
| 758 | inlen = keylen - 8; |
| 759 | q = enctmp + 8; |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 760 | EVP_CIPHER_CTX_init(&cctx); |
| 761 | EVP_DecryptInit_ex(&cctx, EVP_rc4(), NULL, keybuf, NULL); |
| 762 | EVP_DecryptUpdate(&cctx, q, &enctmplen, p, inlen); |
| 763 | EVP_DecryptFinal_ex(&cctx, q + enctmplen, &enctmplen); |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 764 | magic = read_ledword((const unsigned char **)&q); |
| 765 | if (magic != MS_RSA2MAGIC && magic != MS_DSS2MAGIC) |
| 766 | { |
| 767 | q = enctmp + 8; |
| 768 | memset(keybuf + 5, 0, 11); |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 769 | EVP_DecryptInit_ex(&cctx, EVP_rc4(), NULL, keybuf, |
| 770 | NULL); |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 771 | OPENSSL_cleanse(keybuf, 20); |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 772 | EVP_DecryptUpdate(&cctx, q, &enctmplen, p, inlen); |
| 773 | EVP_DecryptFinal_ex(&cctx, q + enctmplen, |
| 774 | &enctmplen); |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 775 | magic = read_ledword((const unsigned char **)&q); |
| 776 | if (magic != MS_RSA2MAGIC && magic != MS_DSS2MAGIC) |
| 777 | { |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 778 | EVP_CIPHER_CTX_cleanup(&cctx); |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 779 | PEMerr(PEM_F_DO_PVK_BODY, PEM_R_BAD_DECRYPT); |
| 780 | goto err; |
| 781 | } |
| 782 | } |
| 783 | else |
| 784 | OPENSSL_cleanse(keybuf, 20); |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 785 | EVP_CIPHER_CTX_cleanup(&cctx); |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 786 | p = enctmp; |
| 787 | } |
| 788 | |
| 789 | ret = b2i_PrivateKey(&p, keylen); |
| 790 | err: |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 791 | if (enctmp && saltlen) |
| 792 | OPENSSL_free(enctmp); |
| 793 | return ret; |
| 794 | } |
| 795 | |
| 796 | |
| 797 | EVP_PKEY *b2i_PVK_bio(BIO *in, pem_password_cb *cb, void *u) |
| 798 | { |
| 799 | unsigned char pvk_hdr[24], *buf = NULL; |
| 800 | const unsigned char *p; |
| 801 | int buflen; |
| 802 | EVP_PKEY *ret = NULL; |
| 803 | unsigned int saltlen, keylen; |
| 804 | if (BIO_read(in, pvk_hdr, 24) != 24) |
| 805 | { |
| 806 | PEMerr(PEM_F_B2I_PVK_BIO, PEM_R_PVK_DATA_TOO_SHORT); |
| 807 | return NULL; |
| 808 | } |
| 809 | p = pvk_hdr; |
| 810 | |
| 811 | if (!do_PVK_header(&p, 24, 0, &saltlen, &keylen)) |
| 812 | return 0; |
| 813 | buflen = (int) keylen + saltlen; |
| 814 | buf = OPENSSL_malloc(buflen); |
| 815 | if (!buf) |
| 816 | { |
| 817 | PEMerr(PEM_F_B2I_PVK_BIO, ERR_R_MALLOC_FAILURE); |
| 818 | return 0; |
| 819 | } |
| 820 | p = buf; |
| 821 | if (BIO_read(in, buf, buflen) != buflen) |
| 822 | { |
| 823 | PEMerr(PEM_F_B2I_PVK_BIO, PEM_R_PVK_DATA_TOO_SHORT); |
| 824 | goto err; |
| 825 | } |
| 826 | ret = do_PVK_body(&p, saltlen, keylen, cb, u); |
| 827 | |
| 828 | err: |
| 829 | if (buf) |
| 830 | { |
| 831 | OPENSSL_cleanse(buf, buflen); |
| 832 | OPENSSL_free(buf); |
| 833 | } |
| 834 | return ret; |
| 835 | } |
| 836 | |
| 837 | |
| 838 | |
| 839 | static int i2b_PVK(unsigned char **out, EVP_PKEY*pk, int enclevel, |
| 840 | pem_password_cb *cb, void *u) |
| 841 | { |
| 842 | int outlen = 24, pklen; |
| 843 | unsigned char *p, *salt = NULL; |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 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 | { |
| 856 | p = OPENSSL_malloc(outlen); |
| 857 | if (!p) |
| 858 | { |
| 859 | PEMerr(PEM_F_I2B_PVK,ERR_R_MALLOC_FAILURE); |
| 860 | return -1; |
| 861 | } |
| 862 | *out = p; |
| 863 | } |
| 864 | |
| 865 | write_ledword(&p, MS_PVKMAGIC); |
| 866 | write_ledword(&p, 0); |
| 867 | if (pk->type == EVP_PKEY_DSA) |
| 868 | write_ledword(&p, MS_KEYTYPE_SIGN); |
| 869 | else |
| 870 | write_ledword(&p, MS_KEYTYPE_KEYX); |
| 871 | write_ledword(&p, enclevel ? 1 : 0); |
| 872 | write_ledword(&p, enclevel ? PVK_SALTLEN: 0); |
| 873 | write_ledword(&p, pklen); |
| 874 | if (enclevel) |
| 875 | { |
| 876 | if (RAND_bytes(p, PVK_SALTLEN) <= 0) |
| 877 | goto error; |
| 878 | salt = p; |
| 879 | p += PVK_SALTLEN; |
| 880 | } |
| 881 | do_i2b(&p, pk, 0); |
| 882 | if (enclevel == 0) |
| 883 | return outlen; |
| 884 | else |
| 885 | { |
| 886 | char psbuf[PEM_BUFSIZE]; |
| 887 | unsigned char keybuf[20]; |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 888 | EVP_CIPHER_CTX cctx; |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 889 | int enctmplen, inlen; |
| 890 | if (cb) |
| 891 | inlen=cb(psbuf,PEM_BUFSIZE,1,u); |
| 892 | else |
| 893 | inlen=PEM_def_callback(psbuf,PEM_BUFSIZE,1,u); |
| 894 | if (inlen <= 0) |
| 895 | { |
| 896 | PEMerr(PEM_F_I2B_PVK,PEM_R_BAD_PASSWORD_READ); |
| 897 | goto error; |
| 898 | } |
| 899 | if (!derive_pvk_key(keybuf, salt, PVK_SALTLEN, |
| 900 | (unsigned char *)psbuf, inlen)) |
| 901 | goto error; |
| 902 | if (enclevel == 1) |
| 903 | memset(keybuf + 5, 0, 11); |
| 904 | p = salt + PVK_SALTLEN + 8; |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 905 | EVP_CIPHER_CTX_init(&cctx); |
| 906 | EVP_EncryptInit_ex(&cctx, EVP_rc4(), NULL, keybuf, NULL); |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 907 | OPENSSL_cleanse(keybuf, 20); |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 908 | EVP_DecryptUpdate(&cctx, p, &enctmplen, p, pklen - 8); |
| 909 | EVP_DecryptFinal_ex(&cctx, p + enctmplen, &enctmplen); |
| 910 | EVP_CIPHER_CTX_cleanup(&cctx); |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 911 | } |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 912 | return outlen; |
| 913 | |
| 914 | error: |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 915 | return -1; |
| 916 | } |
| 917 | |
| 918 | int i2b_PVK_bio(BIO *out, EVP_PKEY *pk, int enclevel, |
| 919 | pem_password_cb *cb, void *u) |
| 920 | { |
| 921 | unsigned char *tmp = NULL; |
| 922 | int outlen, wrlen; |
| 923 | outlen = i2b_PVK(&tmp, pk, enclevel, cb, u); |
| 924 | if (outlen < 0) |
| 925 | return -1; |
| 926 | wrlen = BIO_write(out, tmp, outlen); |
| 927 | OPENSSL_free(tmp); |
| 928 | if (wrlen == outlen) |
| 929 | { |
| 930 | PEMerr(PEM_F_I2B_PVK_BIO, PEM_R_BIO_WRITE_FAILURE); |
| 931 | return outlen; |
| 932 | } |
| 933 | return -1; |
| 934 | } |
| 935 | |
| 936 | #endif |
| 937 | |
| 938 | #endif |