1 /* $OpenBSD: a_int.c,v 1.44 2022/07/13 20:07:44 jsing Exp $ */ 2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 59 #include <limits.h> 60 #include <stdio.h> 61 #include <string.h> 62 63 #include <openssl/asn1.h> 64 #include <openssl/asn1t.h> 65 #include <openssl/bn.h> 66 #include <openssl/buffer.h> 67 #include <openssl/err.h> 68 69 #include "bytestring.h" 70 71 const ASN1_ITEM ASN1_INTEGER_it = { 72 .itype = ASN1_ITYPE_PRIMITIVE, 73 .utype = V_ASN1_INTEGER, 74 .sname = "ASN1_INTEGER", 75 }; 76 77 ASN1_INTEGER * 78 ASN1_INTEGER_new(void) 79 { 80 return (ASN1_INTEGER *)ASN1_item_new(&ASN1_INTEGER_it); 81 } 82 83 static void 84 asn1_aint_clear(ASN1_INTEGER *aint) 85 { 86 freezero(aint->data, aint->length); 87 88 memset(aint, 0, sizeof(*aint)); 89 90 aint->type = V_ASN1_INTEGER; 91 } 92 93 void 94 ASN1_INTEGER_free(ASN1_INTEGER *a) 95 { 96 ASN1_item_free((ASN1_VALUE *)a, &ASN1_INTEGER_it); 97 } 98 99 static int 100 ASN1_INTEGER_valid(const ASN1_INTEGER *a) 101 { 102 return (a != NULL && a->length >= 0); 103 } 104 105 ASN1_INTEGER * 106 ASN1_INTEGER_dup(const ASN1_INTEGER *x) 107 { 108 if (!ASN1_INTEGER_valid(x)) 109 return NULL; 110 111 return ASN1_STRING_dup(x); 112 } 113 114 int 115 ASN1_INTEGER_cmp(const ASN1_INTEGER *a, const ASN1_INTEGER *b) 116 { 117 int ret = 1; 118 119 /* Compare sign, then content. */ 120 if ((a->type & V_ASN1_NEG) == (b->type & V_ASN1_NEG)) 121 ret = ASN1_STRING_cmp(a, b); 122 123 if ((a->type & V_ASN1_NEG) != 0) 124 return -ret; 125 126 return ret; 127 } 128 129 int 130 asn1_aint_get_uint64(CBS *cbs, uint64_t *out_val) 131 { 132 uint64_t val = 0; 133 uint8_t u8; 134 135 *out_val = 0; 136 137 while (CBS_len(cbs) > 0) { 138 if (!CBS_get_u8(cbs, &u8)) 139 return 0; 140 if (val > (UINT64_MAX >> 8)) { 141 ASN1error(ASN1_R_TOO_LARGE); 142 return 0; 143 } 144 val = val << 8 | u8; 145 } 146 147 *out_val = val; 148 149 return 1; 150 } 151 152 int 153 asn1_aint_set_uint64(uint64_t val, uint8_t **out_data, int *out_len) 154 { 155 uint8_t *data = NULL; 156 size_t data_len = 0; 157 int started = 0; 158 uint8_t u8; 159 CBB cbb; 160 int i; 161 int ret = 0; 162 163 if (!CBB_init(&cbb, sizeof(long))) 164 goto err; 165 166 if (out_data == NULL || out_len == NULL) 167 goto err; 168 if (*out_data != NULL || *out_len != 0) 169 goto err; 170 171 for (i = sizeof(uint64_t) - 1; i >= 0; i--) { 172 u8 = (val >> (i * 8)) & 0xff; 173 if (!started && i != 0 && u8 == 0) 174 continue; 175 if (!CBB_add_u8(&cbb, u8)) 176 goto err; 177 started = 1; 178 } 179 180 if (!CBB_finish(&cbb, &data, &data_len)) 181 goto err; 182 if (data_len > INT_MAX) 183 goto err; 184 185 *out_data = data; 186 *out_len = (int)data_len; 187 data = NULL; 188 189 ret = 1; 190 err: 191 CBB_cleanup(&cbb); 192 freezero(data, data_len); 193 194 return ret; 195 } 196 197 int 198 asn1_aint_get_int64(CBS *cbs, int negative, int64_t *out_val) 199 { 200 uint64_t val; 201 202 if (!asn1_aint_get_uint64(cbs, &val)) 203 return 0; 204 205 if (negative) { 206 if (val > (uint64_t)INT64_MIN) { 207 ASN1error(ASN1_R_TOO_SMALL); 208 return 0; 209 } 210 *out_val = (int64_t)-val; 211 } else { 212 if (val > (uint64_t)INT64_MAX) { 213 ASN1error(ASN1_R_TOO_LARGE); 214 return 0; 215 } 216 *out_val = (int64_t)val; 217 } 218 219 return 1; 220 } 221 222 int 223 ASN1_INTEGER_get_uint64(uint64_t *out_val, const ASN1_INTEGER *aint) 224 { 225 uint64_t val; 226 CBS cbs; 227 228 *out_val = 0; 229 230 if (aint == NULL || aint->length < 0) 231 return 0; 232 233 if (aint->type == V_ASN1_NEG_INTEGER) { 234 ASN1error(ASN1_R_ILLEGAL_NEGATIVE_VALUE); 235 return 0; 236 } 237 if (aint->type != V_ASN1_INTEGER) { 238 ASN1error(ASN1_R_WRONG_INTEGER_TYPE); 239 return 0; 240 } 241 242 CBS_init(&cbs, aint->data, aint->length); 243 244 if (!asn1_aint_get_uint64(&cbs, &val)) 245 return 0; 246 247 *out_val = val; 248 249 return 1; 250 } 251 252 int 253 ASN1_INTEGER_set_uint64(ASN1_INTEGER *aint, uint64_t val) 254 { 255 asn1_aint_clear(aint); 256 257 return asn1_aint_set_uint64(val, &aint->data, &aint->length); 258 } 259 260 int 261 ASN1_INTEGER_get_int64(int64_t *out_val, const ASN1_INTEGER *aint) 262 { 263 CBS cbs; 264 265 *out_val = 0; 266 267 if (aint == NULL || aint->length < 0) 268 return 0; 269 270 if (aint->type != V_ASN1_INTEGER && 271 aint->type != V_ASN1_NEG_INTEGER) { 272 ASN1error(ASN1_R_WRONG_INTEGER_TYPE); 273 return 0; 274 } 275 276 CBS_init(&cbs, aint->data, aint->length); 277 278 return asn1_aint_get_int64(&cbs, (aint->type == V_ASN1_NEG_INTEGER), 279 out_val); 280 } 281 282 int 283 ASN1_INTEGER_set_int64(ASN1_INTEGER *aint, int64_t val) 284 { 285 uint64_t uval; 286 287 asn1_aint_clear(aint); 288 289 uval = (uint64_t)val; 290 291 if (val < 0) { 292 aint->type = V_ASN1_NEG_INTEGER; 293 uval = -uval; 294 } 295 296 return asn1_aint_set_uint64(uval, &aint->data, &aint->length); 297 } 298 299 long 300 ASN1_INTEGER_get(const ASN1_INTEGER *aint) 301 { 302 int64_t val; 303 304 if (aint == NULL) 305 return 0; 306 if (!ASN1_INTEGER_get_int64(&val, aint)) 307 return -1; 308 if (val < LONG_MIN || val > LONG_MAX) { 309 /* hmm... a bit ugly, return all ones */ 310 return -1; 311 } 312 313 return (long)val; 314 } 315 316 int 317 ASN1_INTEGER_set(ASN1_INTEGER *aint, long val) 318 { 319 return ASN1_INTEGER_set_int64(aint, val); 320 } 321 322 ASN1_INTEGER * 323 BN_to_ASN1_INTEGER(const BIGNUM *bn, ASN1_INTEGER *ai) 324 { 325 ASN1_INTEGER *ret; 326 int len, j; 327 328 if (ai == NULL) 329 ret = ASN1_INTEGER_new(); 330 else 331 ret = ai; 332 if (ret == NULL) { 333 ASN1error(ERR_R_NESTED_ASN1_ERROR); 334 goto err; 335 } 336 337 if (!ASN1_INTEGER_valid(ret)) 338 goto err; 339 340 if (BN_is_negative(bn)) 341 ret->type = V_ASN1_NEG_INTEGER; 342 else 343 ret->type = V_ASN1_INTEGER; 344 j = BN_num_bits(bn); 345 len = ((j == 0) ? 0 : ((j / 8) + 1)); 346 if (ret->length < len + 4) { 347 unsigned char *new_data = realloc(ret->data, len + 4); 348 if (!new_data) { 349 ASN1error(ERR_R_MALLOC_FAILURE); 350 goto err; 351 } 352 ret->data = new_data; 353 } 354 ret->length = BN_bn2bin(bn, ret->data); 355 356 /* Correct zero case */ 357 if (!ret->length) { 358 ret->data[0] = 0; 359 ret->length = 1; 360 } 361 return (ret); 362 363 err: 364 if (ret != ai) 365 ASN1_INTEGER_free(ret); 366 return (NULL); 367 } 368 369 BIGNUM * 370 ASN1_INTEGER_to_BN(const ASN1_INTEGER *ai, BIGNUM *bn) 371 { 372 BIGNUM *ret; 373 374 if (!ASN1_INTEGER_valid(ai)) 375 return (NULL); 376 377 if ((ret = BN_bin2bn(ai->data, ai->length, bn)) == NULL) 378 ASN1error(ASN1_R_BN_LIB); 379 else if (ai->type == V_ASN1_NEG_INTEGER) 380 BN_set_negative(ret, 1); 381 return (ret); 382 } 383 384 int 385 i2a_ASN1_INTEGER(BIO *bp, const ASN1_INTEGER *a) 386 { 387 int i, n = 0; 388 static const char h[] = "0123456789ABCDEF"; 389 char buf[2]; 390 391 if (a == NULL) 392 return (0); 393 394 if (a->type & V_ASN1_NEG) { 395 if (BIO_write(bp, "-", 1) != 1) 396 goto err; 397 n = 1; 398 } 399 400 if (a->length == 0) { 401 if (BIO_write(bp, "00", 2) != 2) 402 goto err; 403 n += 2; 404 } else { 405 for (i = 0; i < a->length; i++) { 406 if ((i != 0) && (i % 35 == 0)) { 407 if (BIO_write(bp, "\\\n", 2) != 2) 408 goto err; 409 n += 2; 410 } 411 buf[0] = h[((unsigned char)a->data[i] >> 4) & 0x0f]; 412 buf[1] = h[((unsigned char)a->data[i]) & 0x0f]; 413 if (BIO_write(bp, buf, 2) != 2) 414 goto err; 415 n += 2; 416 } 417 } 418 return (n); 419 420 err: 421 return (-1); 422 } 423 424 int 425 a2i_ASN1_INTEGER(BIO *bp, ASN1_INTEGER *bs, char *buf, int size) 426 { 427 int ret = 0; 428 int i, j,k, m,n, again, bufsize; 429 unsigned char *s = NULL, *sp; 430 unsigned char *bufp; 431 int num = 0, slen = 0, first = 1; 432 433 bs->type = V_ASN1_INTEGER; 434 435 bufsize = BIO_gets(bp, buf, size); 436 for (;;) { 437 if (bufsize < 1) 438 goto err_sl; 439 i = bufsize; 440 if (buf[i - 1] == '\n') 441 buf[--i] = '\0'; 442 if (i == 0) 443 goto err_sl; 444 if (buf[i - 1] == '\r') 445 buf[--i] = '\0'; 446 if (i == 0) 447 goto err_sl; 448 if (buf[i - 1] == '\\') { 449 i--; 450 again = 1; 451 } else 452 again = 0; 453 buf[i] = '\0'; 454 if (i < 2) 455 goto err_sl; 456 457 bufp = (unsigned char *)buf; 458 if (first) { 459 first = 0; 460 if ((bufp[0] == '0') && (buf[1] == '0')) { 461 bufp += 2; 462 i -= 2; 463 } 464 } 465 k = 0; 466 if (i % 2 != 0) { 467 ASN1error(ASN1_R_ODD_NUMBER_OF_CHARS); 468 goto err; 469 } 470 i /= 2; 471 if (num + i > slen) { 472 if ((sp = recallocarray(s, slen, num + i, 1)) == NULL) { 473 ASN1error(ERR_R_MALLOC_FAILURE); 474 goto err; 475 } 476 s = sp; 477 slen = num + i; 478 } 479 for (j = 0; j < i; j++, k += 2) { 480 for (n = 0; n < 2; n++) { 481 m = bufp[k + n]; 482 if ((m >= '0') && (m <= '9')) 483 m -= '0'; 484 else if ((m >= 'a') && (m <= 'f')) 485 m = m - 'a' + 10; 486 else if ((m >= 'A') && (m <= 'F')) 487 m = m - 'A' + 10; 488 else { 489 ASN1error(ASN1_R_NON_HEX_CHARACTERS); 490 goto err; 491 } 492 s[num + j] <<= 4; 493 s[num + j] |= m; 494 } 495 } 496 num += i; 497 if (again) 498 bufsize = BIO_gets(bp, buf, size); 499 else 500 break; 501 } 502 bs->length = num; 503 bs->data = s; 504 return (1); 505 506 err_sl: 507 ASN1error(ASN1_R_SHORT_LINE); 508 err: 509 free(s); 510 return (ret); 511 } 512 513 /* 514 * This converts an ASN1 INTEGER into its content encoding. 515 * The internal representation is an ASN1_STRING whose data is a big endian 516 * representation of the value, ignoring the sign. The sign is determined by 517 * the type: V_ASN1_INTEGER for positive and V_ASN1_NEG_INTEGER for negative. 518 * 519 * Positive integers are no problem: they are almost the same as the DER 520 * encoding, except if the first byte is >= 0x80 we need to add a zero pad. 521 * 522 * Negative integers are a bit trickier... 523 * The DER representation of negative integers is in 2s complement form. 524 * The internal form is converted by complementing each octet and finally 525 * adding one to the result. This can be done less messily with a little trick. 526 * If the internal form has trailing zeroes then they will become FF by the 527 * complement and 0 by the add one (due to carry) so just copy as many trailing 528 * zeros to the destination as there are in the source. The carry will add one 529 * to the last none zero octet: so complement this octet and add one and finally 530 * complement any left over until you get to the start of the string. 531 * 532 * Padding is a little trickier too. If the first bytes is > 0x80 then we pad 533 * with 0xff. However if the first byte is 0x80 and one of the following bytes 534 * is non-zero we pad with 0xff. The reason for this distinction is that 0x80 535 * followed by optional zeros isn't padded. 536 */ 537 538 int 539 i2c_ASN1_INTEGER(ASN1_INTEGER *a, unsigned char **pp) 540 { 541 int pad = 0, ret, i, neg; 542 unsigned char *p, *n, pb = 0; 543 544 if (!ASN1_INTEGER_valid(a)) 545 return 0; 546 547 neg = a->type & V_ASN1_NEG; 548 if (a->length == 0) 549 ret = 1; 550 else { 551 ret = a->length; 552 i = a->data[0]; 553 if (!neg && (i > 127)) { 554 pad = 1; 555 pb = 0; 556 } else if (neg) { 557 if (i > 128) { 558 pad = 1; 559 pb = 0xFF; 560 } else if (i == 128) { 561 /* 562 * Special case: if any other bytes non zero we pad: 563 * otherwise we don't. 564 */ 565 for (i = 1; i < a->length; i++) if (a->data[i]) { 566 pad = 1; 567 pb = 0xFF; 568 break; 569 } 570 } 571 } 572 ret += pad; 573 } 574 if (pp == NULL) 575 return (ret); 576 p= *pp; 577 578 if (pad) 579 *(p++) = pb; 580 if (a->length == 0) 581 *(p++) = 0; 582 else if (!neg) 583 memcpy(p, a->data, a->length); 584 else { 585 /* Begin at the end of the encoding */ 586 n = a->data + a->length - 1; 587 p += a->length - 1; 588 i = a->length; 589 /* Copy zeros to destination as long as source is zero */ 590 while (!*n) { 591 *(p--) = 0; 592 n--; 593 i--; 594 } 595 /* Complement and increment next octet */ 596 *(p--) = ((*(n--)) ^ 0xff) + 1; 597 i--; 598 /* Complement any octets left */ 599 for (; i > 0; i--) 600 *(p--) = *(n--) ^ 0xff; 601 } 602 603 *pp += ret; 604 return (ret); 605 } 606 607 static void 608 asn1_aint_twos_complement(uint8_t *data, size_t data_len) 609 { 610 uint8_t carry = 1; 611 ssize_t i; 612 613 for (i = data_len - 1; i >= 0; i--) { 614 data[i] = (data[i] ^ 0xff) + carry; 615 if (data[i] != 0) 616 carry = 0; 617 } 618 } 619 620 static int 621 asn1_aint_keep_twos_padding(const uint8_t *data, size_t data_len) 622 { 623 size_t i; 624 625 /* 626 * If a two's complement value has a padding byte (0xff) and the rest 627 * of the value is all zeros, the padding byte cannot be removed as when 628 * converted from two's complement this becomes 0x01 (in the place of 629 * the padding byte) followed by the same number of zero bytes. 630 */ 631 if (data_len <= 1 || data[0] != 0xff) 632 return 0; 633 for (i = 1; i < data_len; i++) { 634 if (data[i] != 0) 635 return 0; 636 } 637 return 1; 638 } 639 640 int 641 c2i_ASN1_INTEGER_cbs(ASN1_INTEGER **out_aint, CBS *cbs) 642 { 643 ASN1_INTEGER *aint = NULL; 644 uint8_t *data = NULL; 645 size_t data_len = 0; 646 uint8_t padding, val; 647 uint8_t negative = 0; 648 int ret = 0; 649 650 if (out_aint == NULL) 651 goto err; 652 653 if (*out_aint != NULL) { 654 ASN1_INTEGER_free(*out_aint); 655 *out_aint = NULL; 656 } 657 658 if (CBS_len(cbs) == 0) { 659 /* XXX INVALID ENCODING? */ 660 ASN1error(ERR_R_ASN1_LENGTH_MISMATCH); 661 goto err; 662 } 663 if (!CBS_peek_u8(cbs, &val)) 664 goto err; 665 666 /* Top most bit indicates sign, padding is all zeros or all ones. */ 667 negative = (val >> 7); 668 padding = ~(negative - 1) & 0xff; 669 670 /* 671 * Ensure that the first 9 bits are not all zero or all one, as per 672 * X.690 section 8.3.2. Remove the padding octet if possible. 673 */ 674 if (CBS_len(cbs) > 1 && val == padding) { 675 if (!asn1_aint_keep_twos_padding(CBS_data(cbs), CBS_len(cbs))) { 676 if (!CBS_get_u8(cbs, &padding)) 677 goto err; 678 if (!CBS_peek_u8(cbs, &val)) 679 goto err; 680 if ((val >> 7) == (padding >> 7)) { 681 /* XXX INVALID ENCODING? */ 682 ASN1error(ERR_R_ASN1_LENGTH_MISMATCH); 683 goto err; 684 } 685 } 686 } 687 688 if (!CBS_stow(cbs, &data, &data_len)) 689 goto err; 690 if (data_len > INT_MAX) 691 goto err; 692 693 if ((aint = ASN1_INTEGER_new()) == NULL) 694 goto err; 695 696 /* 697 * Negative integers are handled as a separate type - convert from 698 * two's complement for internal representation. 699 */ 700 if (negative) { 701 aint->type = V_ASN1_NEG_INTEGER; 702 asn1_aint_twos_complement(data, data_len); 703 } 704 705 aint->data = data; 706 aint->length = (int)data_len; 707 data = NULL; 708 709 *out_aint = aint; 710 aint = NULL; 711 712 ret = 1; 713 714 err: 715 ASN1_INTEGER_free(aint); 716 freezero(data, data_len); 717 718 return ret; 719 } 720 721 ASN1_INTEGER * 722 c2i_ASN1_INTEGER(ASN1_INTEGER **out_aint, const unsigned char **pp, long len) 723 { 724 ASN1_INTEGER *aint = NULL; 725 CBS content; 726 727 if (out_aint != NULL) { 728 ASN1_INTEGER_free(*out_aint); 729 *out_aint = NULL; 730 } 731 732 if (len < 0) { 733 ASN1error(ASN1_R_LENGTH_ERROR); 734 return NULL; 735 } 736 737 CBS_init(&content, *pp, len); 738 739 if (!c2i_ASN1_INTEGER_cbs(&aint, &content)) 740 return NULL; 741 742 *pp = CBS_data(&content); 743 744 if (out_aint != NULL) 745 *out_aint = aint; 746 747 return aint; 748 } 749 750 int 751 i2d_ASN1_INTEGER(ASN1_INTEGER *a, unsigned char **out) 752 { 753 return ASN1_item_i2d((ASN1_VALUE *)a, out, &ASN1_INTEGER_it); 754 } 755 756 ASN1_INTEGER * 757 d2i_ASN1_INTEGER(ASN1_INTEGER **a, const unsigned char **in, long len) 758 { 759 return (ASN1_INTEGER *)ASN1_item_d2i((ASN1_VALUE **)a, in, len, 760 &ASN1_INTEGER_it); 761 } 762 763 /* This is a version of d2i_ASN1_INTEGER that ignores the sign bit of 764 * ASN1 integers: some broken software can encode a positive INTEGER 765 * with its MSB set as negative (it doesn't add a padding zero). 766 */ 767 768 ASN1_INTEGER * 769 d2i_ASN1_UINTEGER(ASN1_INTEGER **a, const unsigned char **pp, long length) 770 { 771 ASN1_INTEGER *ret = NULL; 772 const unsigned char *p; 773 unsigned char *s; 774 long len; 775 int inf, tag, xclass; 776 int i; 777 778 if ((a == NULL) || ((*a) == NULL)) { 779 if ((ret = ASN1_INTEGER_new()) == NULL) 780 return (NULL); 781 } else 782 ret = (*a); 783 784 if (!ASN1_INTEGER_valid(ret)) { 785 i = ERR_R_ASN1_LENGTH_MISMATCH; 786 goto err; 787 } 788 789 p = *pp; 790 inf = ASN1_get_object(&p, &len, &tag, &xclass, length); 791 if (inf & 0x80) { 792 i = ASN1_R_BAD_OBJECT_HEADER; 793 goto err; 794 } 795 796 if (tag != V_ASN1_INTEGER) { 797 i = ASN1_R_EXPECTING_AN_INTEGER; 798 goto err; 799 } 800 801 /* We must malloc stuff, even for 0 bytes otherwise it 802 * signifies a missing NULL parameter. */ 803 if (len < 0 || len > INT_MAX) { 804 i = ERR_R_ASN1_LENGTH_MISMATCH; 805 goto err; 806 } 807 s = malloc(len + 1); 808 if (s == NULL) { 809 i = ERR_R_MALLOC_FAILURE; 810 goto err; 811 } 812 ret->type = V_ASN1_INTEGER; 813 if (len) { 814 if ((*p == 0) && (len != 1)) { 815 p++; 816 len--; 817 } 818 memcpy(s, p, len); 819 p += len; 820 } 821 822 free(ret->data); 823 ret->data = s; 824 ret->length = (int)len; 825 if (a != NULL) 826 (*a) = ret; 827 *pp = p; 828 return (ret); 829 830 err: 831 ASN1error(i); 832 if (a == NULL || *a != ret) 833 ASN1_INTEGER_free(ret); 834 return (NULL); 835 } 836