1/* 2 * The contents of this file are subject to the Mozilla Public 3 * License Version 1.1 (the "License"); you may not use this file 4 * except in compliance with the License. You may obtain a copy of 5 * the License at http://www.mozilla.org/MPL/ 6 * 7 * Software distributed under the License is distributed on an "AS 8 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or 9 * implied. See the License for the specific language governing 10 * rights and limitations under the License. 11 * 12 * The Original Code is the Netscape security libraries. 13 * 14 * The Initial Developer of the Original Code is Netscape 15 * Communications Corporation. Portions created by Netscape are 16 * Copyright (C) 1994-2000 Netscape Communications Corporation. All 17 * Rights Reserved. 18 * 19 * Contributor(s): 20 * 21 * Alternatively, the contents of this file may be used under the 22 * terms of the GNU General Public License Version 2 or later (the 23 * "GPL"), in which case the provisions of the GPL are applicable 24 * instead of those above. If you wish to allow use of your 25 * version of this file only under the terms of the GPL and not to 26 * allow others to use your version of this file under the MPL, 27 * indicate your decision by deleting the provisions above and 28 * replace them with the notice and other provisions required by 29 * the GPL. If you do not delete the provisions above, a recipient 30 * may use your version of this file under either the MPL or the 31 * GPL. 32 */ 33 34/* 35 * Support for ENcoding ASN.1 data based on BER/DER (Basic/Distinguished 36 * Encoding Rules). 37 * 38 * $Id: secasn1e.c,v 1.7 2004/05/13 15:29:13 dmitch Exp $ 39 */ 40 41#include "secasn1.h" 42 43typedef enum { 44 beforeHeader, 45 duringContents, 46 duringGroup, 47 duringSequence, 48 afterContents, 49 afterImplicit, 50 afterInline, 51 afterPointer, 52 afterChoice, 53 notInUse 54} sec_asn1e_parse_place; 55 56typedef enum { 57 allDone, 58 encodeError, 59 keepGoing, 60 needBytes 61} sec_asn1e_parse_status; 62 63typedef struct sec_asn1e_state_struct { 64 SEC_ASN1EncoderContext *top; 65 const SecAsn1Template *theTemplate; 66 void *src; 67 68 struct sec_asn1e_state_struct *parent; /* aka prev */ 69 struct sec_asn1e_state_struct *child; /* aka next */ 70 71 sec_asn1e_parse_place place; /* where we are in encoding process */ 72 73 /* 74 * XXX explain the next fields as clearly as possible... 75 */ 76 unsigned char tag_modifiers; 77 unsigned char tag_number; 78 unsigned long underlying_kind; 79 80 int depth; 81 82 PRBool explicit, /* we are handling an explicit header */ 83 indefinite, /* need end-of-contents */ 84 is_string, /* encoding a simple string or an ANY */ 85 may_stream, /* when streaming, do indefinite encoding */ 86 optional, /* omit field if it has no contents */ 87 ignore_stream /* ignore streaming value of sub-template */ 88 #ifdef __APPLE__ 89 , 90 signedInt /* signed alternate to SEC_ASN1_INTEGER */ 91 #endif 92 ; 93} sec_asn1e_state; 94 95/* 96 * An "outsider" will have an opaque pointer to this, created by calling 97 * SEC_ASN1EncoderStart(). It will be passed back in to all subsequent 98 * calls to SEC_ASN1EncoderUpdate() and related routines, and when done 99 * it is passed to SEC_ASN1EncoderFinish(). 100 */ 101struct sec_EncoderContext_struct { 102 PRArenaPool *our_pool; /* for our internal allocs */ 103 104 sec_asn1e_state *current; 105 sec_asn1e_parse_status status; 106 107 PRBool streaming; 108 PRBool from_buf; 109 110 SEC_ASN1NotifyProc notify_proc; /* call before/after handling field */ 111 void *notify_arg; /* argument to notify_proc */ 112 PRBool during_notify; /* true during call to notify_proc */ 113 114 SEC_ASN1WriteProc output_proc; /* pass encoded bytes to this */ 115 void *output_arg; /* argument to that function */ 116}; 117 118 119static sec_asn1e_state * 120sec_asn1e_push_state (SEC_ASN1EncoderContext *cx, 121 const SecAsn1Template *theTemplate, 122 const void *src, PRBool new_depth) 123{ 124 sec_asn1e_state *state, *new_state; 125 126 state = cx->current; 127 128 new_state = (sec_asn1e_state*)PORT_ArenaZAlloc (cx->our_pool, 129 sizeof(*new_state)); 130 if (new_state == NULL) { 131 cx->status = encodeError; 132 return NULL; 133 } 134 135 new_state->top = cx; 136 new_state->parent = state; 137 new_state->theTemplate = theTemplate; 138 new_state->place = notInUse; 139 if (src != NULL) 140 new_state->src = (char *)src + theTemplate->offset; 141 142 if (state != NULL) { 143 new_state->depth = state->depth; 144 if (new_depth) 145 new_state->depth++; 146 state->child = new_state; 147 } 148 149 cx->current = new_state; 150 return new_state; 151} 152 153 154static void 155sec_asn1e_scrub_state (sec_asn1e_state *state) 156{ 157 /* 158 * Some default "scrubbing". 159 * XXX right set of initializations? 160 */ 161 state->place = beforeHeader; 162 state->indefinite = PR_FALSE; 163} 164 165 166static void 167sec_asn1e_notify_before (SEC_ASN1EncoderContext *cx, void *src, int depth) 168{ 169 if (cx->notify_proc == NULL) 170 return; 171 172 cx->during_notify = PR_TRUE; 173 (* cx->notify_proc) (cx->notify_arg, PR_TRUE, src, depth); 174 cx->during_notify = PR_FALSE; 175} 176 177 178static void 179sec_asn1e_notify_after (SEC_ASN1EncoderContext *cx, void *src, int depth) 180{ 181 if (cx->notify_proc == NULL) 182 return; 183 184 cx->during_notify = PR_TRUE; 185 (* cx->notify_proc) (cx->notify_arg, PR_FALSE, src, depth); 186 cx->during_notify = PR_FALSE; 187} 188 189 190static sec_asn1e_state * 191sec_asn1e_init_state_based_on_template (sec_asn1e_state *state) 192{ 193 PRBool explicit, is_string, may_stream, optional, universal, ignore_stream; 194 unsigned char tag_modifiers; 195 unsigned long encode_kind, under_kind; 196 unsigned long tag_number; 197 #ifdef __APPLE__ 198 PRBool signedInt, dynamic; 199 #endif 200 201 encode_kind = state->theTemplate->kind; 202 203 universal = ((encode_kind & SEC_ASN1_CLASS_MASK) == SEC_ASN1_UNIVERSAL) 204 ? PR_TRUE : PR_FALSE; 205 206 explicit = (encode_kind & SEC_ASN1_EXPLICIT) ? PR_TRUE : PR_FALSE; 207 encode_kind &= ~SEC_ASN1_EXPLICIT; 208 209 optional = (encode_kind & SEC_ASN1_OPTIONAL) ? PR_TRUE : PR_FALSE; 210 encode_kind &= ~SEC_ASN1_OPTIONAL; 211 212 PORT_Assert (!(explicit && universal)); /* bad templates */ 213 214 may_stream = (encode_kind & SEC_ASN1_MAY_STREAM) ? PR_TRUE : PR_FALSE; 215 encode_kind &= ~SEC_ASN1_MAY_STREAM; 216 217 ignore_stream = (encode_kind & SEC_ASN1_NO_STREAM) ? PR_TRUE : PR_FALSE; 218 encode_kind &= ~SEC_ASN1_NO_STREAM; 219 220 #ifdef __APPLE__ 221 signedInt = (encode_kind & SEC_ASN1_SIGNED_INT) ? PR_TRUE : PR_FALSE; 222 encode_kind &= ~SEC_ASN1_SIGNED_INT; 223 #endif 224 225 #ifdef __APPLE__ 226 dynamic = (encode_kind & SEC_ASN1_DYNAMIC) ? PR_TRUE : PR_FALSE; 227 #endif 228 encode_kind &= ~SEC_ASN1_DYNAMIC; 229 230 if( encode_kind & SEC_ASN1_CHOICE ) { 231 under_kind = SEC_ASN1_CHOICE; 232 } else 233 234 if ((encode_kind & (SEC_ASN1_POINTER | SEC_ASN1_INLINE)) || (!universal 235 && !explicit)) { 236 const SecAsn1Template *subt; 237 void *src; 238 239 PORT_Assert ((encode_kind & (SEC_ASN1_ANY | SEC_ASN1_SKIP)) == 0); 240 241 sec_asn1e_scrub_state (state); 242 243 if (encode_kind & SEC_ASN1_POINTER) { 244 /* 245 * XXX This used to PORT_Assert (encode_kind == SEC_ASN1_POINTER); 246 * but that was too restrictive. This needs to be fixed, 247 * probably copying what the decoder now checks for, and 248 * adding a big comment here to explain what the checks mean. 249 */ 250 src = *(void **)state->src; 251 state->place = afterPointer; 252 if (src == NULL) { 253 /* 254 * If this is optional, but NULL, then the field does 255 * not need to be encoded. In this case we are done; 256 * we do not want to push a subtemplate. 257 */ 258 if (optional) 259 return state; 260 261 /* 262 * XXX this is an error; need to figure out 263 * how to handle this 264 */ 265 } 266 } else { 267 src = state->src; 268 if (encode_kind & SEC_ASN1_INLINE) { 269 /* check that there are no extraneous bits */ 270 PORT_Assert (encode_kind == SEC_ASN1_INLINE && !optional); 271 state->place = afterInline; 272 } else { 273 /* 274 * Save the tag modifiers and tag number here before moving 275 * on to the next state in case this is a member of a 276 * SEQUENCE OF 277 */ 278 state->tag_modifiers = (unsigned char)encode_kind & SEC_ASN1_TAG_MASK 279 & ~SEC_ASN1_TAGNUM_MASK; 280 state->tag_number = (unsigned char)encode_kind & SEC_ASN1_TAGNUM_MASK; 281 282 state->place = afterImplicit; 283 state->optional = optional; 284 } 285 } 286 287 subt = SEC_ASN1GetSubtemplate (state->theTemplate, state->src, PR_TRUE, 288 NULL /* __APPLE__ */); 289 state = sec_asn1e_push_state (state->top, subt, src, PR_FALSE); 290 if (state == NULL) 291 return NULL; 292 293 if (universal) { 294 /* 295 * This is a POINTER or INLINE; just init based on that 296 * and we are done. 297 */ 298 return sec_asn1e_init_state_based_on_template (state); 299 } 300 301 /* 302 * This is an implicit, non-universal (meaning, application-private 303 * or context-specific) field. This results in a "magic" tag but 304 * encoding based on the underlying type. We pushed a new state 305 * that is based on the subtemplate (the underlying type), but 306 * now we will sort of alias it to give it some of our properties 307 * (tag, optional status, etc.). 308 */ 309 310 under_kind = state->theTemplate->kind; 311 if (under_kind & SEC_ASN1_MAY_STREAM) { 312 if (!ignore_stream) 313 may_stream = PR_TRUE; 314 under_kind &= ~SEC_ASN1_MAY_STREAM; 315 } 316 } else { 317 under_kind = encode_kind; 318 } 319 320 /* 321 * Sanity check that there are no unwanted bits marked in under_kind. 322 * These bits were either removed above (after we recorded them) or 323 * they simply should not be found (signalling a bad/broken template). 324 * XXX is this the right set of bits to test here? (i.e. need to add 325 * or remove any?) 326 */ 327 PORT_Assert ((under_kind & (/*SEC_ASN1_EXPLICIT | */SEC_ASN1_OPTIONAL 328 | SEC_ASN1_SKIP | SEC_ASN1_INNER 329 | SEC_ASN1_DYNAMIC | SEC_ASN1_MAY_STREAM 330 | SEC_ASN1_INLINE | SEC_ASN1_POINTER)) == 0); 331 332 if (encode_kind & SEC_ASN1_ANY) { 333 PORT_Assert (encode_kind == under_kind); 334 tag_modifiers = 0; 335 tag_number = 0; 336 is_string = PR_TRUE; 337 } else { 338 tag_modifiers = (unsigned char)encode_kind & SEC_ASN1_TAG_MASK & 339 ~SEC_ASN1_TAGNUM_MASK; 340 /* 341 * XXX This assumes only single-octet identifiers. To handle 342 * the HIGH TAG form we would need to do some more work, especially 343 * in how to specify them in the template, because right now we 344 * do not provide a way to specify more *tag* bits in encode_kind. 345 */ 346 347 #ifdef __APPLE__ 348 /* 349 * Apple change: if this is a DYNAMIC template, use the tag number 350 * from the subtemplate's kind 351 */ 352 if(dynamic) { 353 tag_number = state->theTemplate->kind & SEC_ASN1_TAGNUM_MASK; 354 explicit = (state->theTemplate->kind & SEC_ASN1_EXPLICIT) ? PR_TRUE : PR_FALSE; 355 tag_modifiers |= (state->theTemplate->kind & SEC_ASN1_CONSTRUCTED); 356 } 357 else 358 #endif /* __APPLE__ */ 359 tag_number = encode_kind & SEC_ASN1_TAGNUM_MASK; 360 361 is_string = PR_FALSE; 362 switch (under_kind & SEC_ASN1_TAGNUM_MASK) { 363 case SEC_ASN1_SET: 364 /* 365 * XXX A plain old SET (as opposed to a SET OF) is not implemented. 366 * If it ever is, remove this assert... 367 */ 368 PORT_Assert ((under_kind & SEC_ASN1_GROUP) != 0); 369 /* fallthru */ 370 case SEC_ASN1_SEQUENCE: 371 tag_modifiers |= SEC_ASN1_CONSTRUCTED; 372 break; 373 case SEC_ASN1_BIT_STRING: 374 case SEC_ASN1_BMP_STRING: 375 case SEC_ASN1_GENERALIZED_TIME: 376 case SEC_ASN1_IA5_STRING: 377 case SEC_ASN1_OCTET_STRING: 378 case SEC_ASN1_PRINTABLE_STRING: 379 case SEC_ASN1_T61_STRING: 380 case SEC_ASN1_UNIVERSAL_STRING: 381 case SEC_ASN1_UTC_TIME: 382 case SEC_ASN1_UTF8_STRING: 383 case SEC_ASN1_VISIBLE_STRING: 384 /* 385 * We do not yet know if we will be constructing the string, 386 * so we have to wait to do this final tag modification. 387 */ 388 is_string = PR_TRUE; 389 break; 390 } 391 } 392 393 state->tag_modifiers = tag_modifiers; 394 state->tag_number = (unsigned char)tag_number; 395 state->underlying_kind = under_kind; 396 state->explicit = explicit; 397 state->may_stream = may_stream; 398 state->is_string = is_string; 399 state->optional = optional; 400 state->ignore_stream = ignore_stream; 401 #ifdef __APPLE__ 402 state->signedInt = signedInt; 403 #endif 404 405 sec_asn1e_scrub_state (state); 406 407 return state; 408} 409 410 411static void 412sec_asn1e_write_part (sec_asn1e_state *state, 413 const char *buf, size_t len, 414 SEC_ASN1EncodingPart part) 415{ 416 SEC_ASN1EncoderContext *cx; 417 418 cx = state->top; 419 (* cx->output_proc) (cx->output_arg, buf, len, state->depth, part); 420} 421 422 423/* 424 * XXX This assumes only single-octet identifiers. To handle 425 * the HIGH TAG form we would need to modify this interface and 426 * teach it to properly encode the special form. 427 */ 428static void 429sec_asn1e_write_identifier_bytes (sec_asn1e_state *state, unsigned char value) 430{ 431 char byte; 432 433 byte = (char) value; 434 sec_asn1e_write_part (state, &byte, 1, SEC_ASN1_Identifier); 435} 436 437int 438SEC_ASN1EncodeLength(unsigned char *buf,unsigned long value) { 439 int lenlen; 440 441 lenlen = SEC_ASN1LengthLength (value); 442 if (lenlen == 1) { 443 buf[0] = value; 444 } else { 445 int i; 446 447 i = lenlen - 1; 448 buf[0] = 0x80 | i; 449 while (i) { 450 buf[i--] = value; 451 value >>= 8; 452 } 453 PORT_Assert (value == 0); 454 } 455 return lenlen; 456} 457 458static void 459sec_asn1e_write_length_bytes (sec_asn1e_state *state, unsigned long value, 460 PRBool indefinite) 461{ 462 int lenlen; 463 unsigned char buf[sizeof(unsigned long) + 1]; 464 465 if (indefinite) { 466 PORT_Assert (value == 0); 467 buf[0] = 0x80; 468 lenlen = 1; 469 } else { 470 lenlen = SEC_ASN1EncodeLength(buf,value); 471 } 472 473 sec_asn1e_write_part (state, (char *) buf, lenlen, SEC_ASN1_Length); 474} 475 476 477static void 478sec_asn1e_write_contents_bytes (sec_asn1e_state *state, 479 const char *buf, unsigned long len) 480{ 481 sec_asn1e_write_part (state, buf, len, SEC_ASN1_Contents); 482} 483 484 485static void 486sec_asn1e_write_end_of_contents_bytes (sec_asn1e_state *state) 487{ 488 const char eoc[2] = {0, 0}; 489 490 sec_asn1e_write_part (state, eoc, 2, SEC_ASN1_EndOfContents); 491} 492 493static int 494sec_asn1e_which_choice 495( 496 void *src, 497 const SecAsn1Template *theTemplate 498) 499{ 500 int rv; 501 unsigned int which = *(unsigned int *)src; 502 503 for( rv = 1, theTemplate++; theTemplate->kind != 0; rv++, theTemplate++ ) { 504 if( which == theTemplate->size ) { 505 return rv; 506 } 507 } 508 509 return 0; 510} 511 512static unsigned long 513sec_asn1e_contents_length (const SecAsn1Template *theTemplate, void *src, 514 PRBool ignoresubstream, PRBool *noheaderp) 515{ 516 unsigned long encode_kind, underlying_kind; 517 PRBool explicit, optional, universal, may_stream; 518 unsigned long len; 519 #ifdef __APPLE__ 520 PRBool signedInt; 521 #endif 522 523 /* 524 * This function currently calculates the length in all cases 525 * except the following: when writing out the contents of a 526 * template that belongs to a state where it was a sub-template 527 * with the SEC_ASN1_MAY_STREAM bit set and it's parent had the 528 * optional bit set. The information that the parent is optional 529 * and that we should return the length of 0 when that length is 530 * present since that means the optional field is no longer present. 531 * So we add the ignoresubstream flag which is passed in when 532 * writing the contents, but for all recursive calls to 533 * sec_asn1e_contents_length, we pass PR_FALSE, because this 534 * function correctly calculates the length for children templates 535 * from that point on. Confused yet? At least you didn't have 536 * to figure it out. ;) -javi 537 */ 538 encode_kind = theTemplate->kind; 539 540 universal = ((encode_kind & SEC_ASN1_CLASS_MASK) == SEC_ASN1_UNIVERSAL) 541 ? PR_TRUE : PR_FALSE; 542 543 explicit = (encode_kind & SEC_ASN1_EXPLICIT) ? PR_TRUE : PR_FALSE; 544 encode_kind &= ~SEC_ASN1_EXPLICIT; 545 546 optional = (encode_kind & SEC_ASN1_OPTIONAL) ? PR_TRUE : PR_FALSE; 547 encode_kind &= ~SEC_ASN1_OPTIONAL; 548 549 PORT_Assert (!(explicit && universal)); /* bad templates */ 550 551 may_stream = (encode_kind & SEC_ASN1_MAY_STREAM) ? PR_TRUE : PR_FALSE; 552 encode_kind &= ~SEC_ASN1_MAY_STREAM; 553 554 /* Just clear this to get it out of the way; we do not need it here */ 555 encode_kind &= ~SEC_ASN1_DYNAMIC; 556 encode_kind &= ~SEC_ASN1_NO_STREAM; 557 558 if( encode_kind & SEC_ASN1_CHOICE ) { 559 void *src2; 560 int indx = sec_asn1e_which_choice(src, theTemplate); 561 if( 0 == indx ) { 562 /* XXX set an error? "choice not found" */ 563 /* state->top->status = encodeError; */ 564 return 0; 565 } 566 567 src2 = (void *)((char *)src - theTemplate->offset + theTemplate[indx].offset); 568 569 return sec_asn1e_contents_length(&theTemplate[indx], src2, 570 PR_FALSE, noheaderp); 571 } 572 573 if ((encode_kind & (SEC_ASN1_POINTER | SEC_ASN1_INLINE)) || !universal) { 574 575 /* XXX any bits we want to disallow (PORT_Assert against) here? */ 576 577 theTemplate = SEC_ASN1GetSubtemplate (theTemplate, src, PR_TRUE, 578 NULL /* __APPLE__ */); 579 580 if (encode_kind & SEC_ASN1_POINTER) { 581 /* 582 * XXX This used to PORT_Assert (encode_kind == SEC_ASN1_POINTER); 583 * but that was too restrictive. This needs to be fixed, 584 * probably copying what the decoder now checks for, and 585 * adding a big comment here to explain what the checks mean. 586 * Alternatively, the check here could be omitted altogether 587 * just letting sec_asn1e_init_state_based_on_template 588 * do it, since that routine can do better error handling, too. 589 */ 590 src = *(void **)src; 591 if (src == NULL) { 592 if (optional) 593 *noheaderp = PR_TRUE; 594 else 595 *noheaderp = PR_FALSE; 596 return 0; 597 } 598 } else if (encode_kind & SEC_ASN1_INLINE) { 599 /* check that there are no extraneous bits */ 600 PORT_Assert (encode_kind == SEC_ASN1_INLINE && !optional); 601 } 602 603 src = (char *)src + theTemplate->offset; 604 605 if (explicit) { 606 len = sec_asn1e_contents_length (theTemplate, src, PR_FALSE, 607 noheaderp); 608 if (len == 0 && optional) { 609 *noheaderp = PR_TRUE; 610 } else if (*noheaderp) { 611 /* Okay, *we* do not want to add in a header, but our caller still does. */ 612 *noheaderp = PR_FALSE; 613 } else { 614 /* if the inner content exists, our length is 615 * len(identifier) + len(length) + len(innercontent) 616 * XXX we currently assume len(identifier) == 1; 617 * to support a high-tag-number this would need to be smarter. 618 */ 619 len += 1 + SEC_ASN1LengthLength (len); 620 } 621 return len; 622 } 623 624 underlying_kind = theTemplate->kind; 625 underlying_kind &= ~SEC_ASN1_MAY_STREAM; 626 /* XXX Should we recurse here? */ 627 } else { 628 underlying_kind = encode_kind; 629 } 630 631 #ifdef __APPLE__ 632 signedInt = (underlying_kind & SEC_ASN1_SIGNED_INT) ? 633 PR_TRUE : PR_FALSE; 634 #endif 635 636 /* This is only used in decoding; it plays no part in encoding. */ 637 if (underlying_kind & SEC_ASN1_SAVE) { 638 /* check that there are no extraneous bits */ 639 PORT_Assert (underlying_kind == SEC_ASN1_SAVE); 640 *noheaderp = PR_TRUE; 641 return 0; 642 } 643 644 /* Having any of these bits is not expected here... */ 645 PORT_Assert ((underlying_kind & (SEC_ASN1_EXPLICIT | SEC_ASN1_OPTIONAL 646 | SEC_ASN1_INLINE | SEC_ASN1_POINTER 647 | SEC_ASN1_DYNAMIC | SEC_ASN1_MAY_STREAM 648 | SEC_ASN1_SAVE | SEC_ASN1_SKIP)) == 0); 649 650 if( underlying_kind & SEC_ASN1_CHOICE ) { 651 void *src2; 652 int indx = sec_asn1e_which_choice(src, theTemplate); 653 if( 0 == indx ) { 654 /* XXX set an error? "choice not found" */ 655 /* state->top->status = encodeError; */ 656 return 0; 657 } 658 659 src2 = (void *)((char *)src - theTemplate->offset + theTemplate[indx].offset); 660 len = sec_asn1e_contents_length(&theTemplate[indx], src2, PR_FALSE, 661 noheaderp); 662 } else 663 664 switch (underlying_kind) { 665 case SEC_ASN1_SEQUENCE_OF: 666 case SEC_ASN1_SET_OF: 667 { 668 const SecAsn1Template *tmpt; 669 void *sub_src; 670 unsigned long sub_len; 671 void **group; 672 673 len = 0; 674 675 group = *(void ***)src; 676 if (group == NULL) 677 break; 678 679 tmpt = SEC_ASN1GetSubtemplate (theTemplate, src, PR_TRUE, 680 NULL /* __APPLE__ */); 681 682 for (; *group != NULL; group++) { 683 sub_src = (char *)(*group) + tmpt->offset; 684 sub_len = sec_asn1e_contents_length (tmpt, sub_src, PR_FALSE, 685 noheaderp); 686 len += sub_len; 687 /* 688 * XXX The 1 below is the presumed length of the identifier; 689 * to support a high-tag-number this would need to be smarter. 690 */ 691 if (!*noheaderp) 692 len += 1 + SEC_ASN1LengthLength (sub_len); 693 } 694 } 695 break; 696 697 case SEC_ASN1_SEQUENCE: 698 case SEC_ASN1_SET: 699 { 700 const SecAsn1Template *tmpt; 701 void *sub_src; 702 unsigned long sub_len; 703 704 len = 0; 705 for (tmpt = theTemplate + 1; tmpt->kind; tmpt++) { 706 sub_src = (char *)src + tmpt->offset; 707 sub_len = sec_asn1e_contents_length (tmpt, sub_src, PR_FALSE, 708 noheaderp); 709 len += sub_len; 710 /* 711 * XXX The 1 below is the presumed length of the identifier; 712 * to support a high-tag-number this would need to be smarter. 713 */ 714 if (!*noheaderp) 715 len += 1 + SEC_ASN1LengthLength (sub_len); 716 } 717 } 718 break; 719 720 case SEC_ASN1_BIT_STRING: 721 /* convert bit length to byte */ 722 len = (((SecAsn1Item *)src)->Length + 7) >> 3; 723 /* bit string contents involve an extra octet */ 724 if (len) 725 len++; 726 break; 727 728 case SEC_ASN1_INTEGER: 729 /* ASN.1 INTEGERs are signed. 730 * If the source is an unsigned integer, the encoder will need 731 * to handle the conversion here. 732 */ 733 { 734 unsigned char *buf = ((SecAsn1Item *)src)->Data; 735 #ifndef __APPLE__ 736 SecAsn1ItemType integerType = ((SecAsn1Item *)src)->type; 737 #endif 738 len = ((SecAsn1Item *)src)->Length; 739 while (len > 0) { 740 if (*buf != 0) { 741 #ifdef __APPLE__ 742 if (*buf & 0x80 && !signedInt) { 743 #else 744 if (*buf & 0x80 && integerType == siUnsignedInteger) { 745 #endif // __APPLE__ 746 len++; /* leading zero needed to make number signed */ 747 } 748 break; /* reached beginning of number */ 749 } 750 if (len == 1) { 751 break; /* the number 0 */ 752 } 753 if (buf[1] & 0x80) { 754 break; /* leading zero already present */ 755 } 756 /* extraneous leading zero, keep going */ 757 buf++; 758 len--; 759 } 760 } 761 break; 762 763 default: 764 len = ((SecAsn1Item *)src)->Length; 765 if (may_stream && len == 0 && !ignoresubstream) 766 len = 1; /* if we're streaming, we may have a secitem w/len 0 as placeholder */ 767 break; 768 } 769 770 if ((len == 0 && optional) || underlying_kind == SEC_ASN1_ANY) 771 *noheaderp = PR_TRUE; 772 else 773 *noheaderp = PR_FALSE; 774 775 return len; 776} 777 778 779static void 780sec_asn1e_write_header (sec_asn1e_state *state) 781{ 782 unsigned long contents_length; 783 unsigned char tag_number, tag_modifiers; 784 PRBool noheader; 785 786 PORT_Assert (state->place == beforeHeader); 787 788 tag_number = state->tag_number; 789 tag_modifiers = state->tag_modifiers; 790 791 if (state->underlying_kind == SEC_ASN1_ANY) { 792 state->place = duringContents; 793 return; 794 } 795 796 if( state->underlying_kind & SEC_ASN1_CHOICE ) { 797 int indx = sec_asn1e_which_choice(state->src, state->theTemplate); 798 if( 0 == indx ) { 799 /* XXX set an error? "choice not found" */ 800 state->top->status = encodeError; 801 return; 802 } 803 804 state->place = afterChoice; 805 state = sec_asn1e_push_state(state->top, &state->theTemplate[indx], 806 (char *)state->src - state->theTemplate->offset, 807 PR_TRUE); 808 809 if( (sec_asn1e_state *)NULL != state ) { 810 /* 811 * Do the "before" field notification. 812 */ 813 sec_asn1e_notify_before (state->top, state->src, state->depth); 814 state = sec_asn1e_init_state_based_on_template (state); 815 } 816 817 return; 818 } 819 820 /* 821 * We are doing a definite-length encoding. First we have to 822 * walk the data structure to calculate the entire contents length. 823 */ 824 contents_length = sec_asn1e_contents_length (state->theTemplate, 825 state->src, 826 state->ignore_stream, 827 &noheader); 828 /* 829 * We might be told explicitly not to put out a header. 830 * But it can also be the case, via a pushed subtemplate, that 831 * sec_asn1e_contents_length could not know that this field is 832 * really optional. So check for that explicitly, too. 833 */ 834 if (noheader || (contents_length == 0 && state->optional)) { 835 state->place = afterContents; 836 if (state->top->streaming && state->may_stream && state->top->from_buf) 837 /* we did not find an optional indefinite string, so we don't encode it. 838 * However, if TakeFromBuf is on, we stop here anyway to give our caller 839 * a chance to intercept at the same point where we would stop if the 840 * field were present. */ 841 state->top->status = needBytes; 842 return; 843 } 844 845 if (state->top->streaming && state->may_stream 846 && (state->top->from_buf || !state->is_string)) { 847 /* 848 * We need to put out an indefinite-length encoding. 849 */ 850 state->indefinite = PR_TRUE; 851 /* 852 * The only universal types that can be constructed are SETs, 853 * SEQUENCEs, and strings; so check that it is one of those, 854 * or that it is not universal (e.g. context-specific). 855 */ 856 PORT_Assert ((tag_number == SEC_ASN1_SET) 857 || (tag_number == SEC_ASN1_SEQUENCE) 858 || ((tag_modifiers & SEC_ASN1_CLASS_MASK) != 0) 859 || state->is_string); 860 tag_modifiers |= SEC_ASN1_CONSTRUCTED; 861 contents_length = 0; 862 } 863 864 sec_asn1e_write_identifier_bytes (state, (unsigned char)(tag_number | tag_modifiers)); 865 sec_asn1e_write_length_bytes (state, contents_length, state->indefinite); 866 867 if (contents_length == 0 && !state->indefinite) { 868 /* 869 * If no real contents to encode, then we are done with this field. 870 */ 871 state->place = afterContents; 872 return; 873 } 874 875 /* 876 * An EXPLICIT is nothing but an outer header, which we have already 877 * written. Now we need to do the inner header and contents. 878 */ 879 if (state->explicit) { 880 state->place = afterContents; 881 state = sec_asn1e_push_state (state->top, 882 SEC_ASN1GetSubtemplate(state->theTemplate, 883 state->src, 884 PR_TRUE, 885 NULL /* __APPLE__ */), 886 state->src, PR_TRUE); 887 if (state != NULL) 888 state = sec_asn1e_init_state_based_on_template (state); 889 return; 890 } 891 892 switch (state->underlying_kind) { 893 case SEC_ASN1_SET_OF: 894 case SEC_ASN1_SEQUENCE_OF: 895 /* 896 * We need to push a child to handle each member. 897 */ 898 { 899 void **group; 900 const SecAsn1Template *subt; 901 902 group = *(void ***)state->src; 903 if (group == NULL || *group == NULL) { 904 /* 905 * Group is empty; we are done. 906 */ 907 state->place = afterContents; 908 return; 909 } 910 state->place = duringGroup; 911 subt = SEC_ASN1GetSubtemplate (state->theTemplate, state->src, 912 PR_TRUE, NULL /* __APPLE__ */); 913 state = sec_asn1e_push_state (state->top, subt, *group, PR_TRUE); 914 if (state != NULL) 915 state = sec_asn1e_init_state_based_on_template (state); 916 } 917 break; 918 919 case SEC_ASN1_SEQUENCE: 920 case SEC_ASN1_SET: 921 /* 922 * We need to push a child to handle the individual fields. 923 */ 924 state->place = duringSequence; 925 state = sec_asn1e_push_state (state->top, state->theTemplate + 1, 926 state->src, PR_TRUE); 927 if (state != NULL) { 928 /* 929 * Do the "before" field notification. 930 */ 931 sec_asn1e_notify_before (state->top, state->src, state->depth); 932 state = sec_asn1e_init_state_based_on_template (state); 933 } 934 break; 935 936 default: 937 /* 938 * I think we do not need to do anything else. 939 * XXX Correct? 940 */ 941 state->place = duringContents; 942 break; 943 } 944} 945 946 947static void 948sec_asn1e_write_contents (sec_asn1e_state *state, 949 const char *buf, unsigned long len) 950{ 951 PORT_Assert (state->place == duringContents); 952 953 if (state->top->from_buf) { 954 /* 955 * Probably they just turned on "take from buf", but have not 956 * yet given us any bytes. If there is nothing in the buffer 957 * then we have nothing to do but return and wait. 958 */ 959 if (buf == NULL || len == 0) { 960 state->top->status = needBytes; 961 return; 962 } 963 /* 964 * We are streaming, reading from a passed-in buffer. 965 * This means we are encoding a simple string or an ANY. 966 * For the former, we need to put out a substring, with its 967 * own identifier and length. For an ANY, we just write it 968 * out as is (our caller is required to ensure that it 969 * is a properly encoded entity). 970 */ 971 PORT_Assert (state->is_string); /* includes ANY */ 972 if (state->underlying_kind != SEC_ASN1_ANY) { 973 unsigned char identifier; 974 975 /* 976 * Create the identifier based on underlying_kind. We cannot 977 * use tag_number and tag_modifiers because this can be an 978 * implicitly encoded field. In that case, the underlying 979 * substrings *are* encoded with their real tag. 980 */ 981 identifier = (unsigned char)state->underlying_kind & SEC_ASN1_TAG_MASK; 982 /* 983 * The underlying kind should just be a simple string; there 984 * should be no bits like CONTEXT_SPECIFIC or CONSTRUCTED set. 985 */ 986 PORT_Assert ((identifier & SEC_ASN1_TAGNUM_MASK) == identifier); 987 /* 988 * Write out the tag and length for the substring. 989 */ 990 sec_asn1e_write_identifier_bytes (state, identifier); 991 if (state->underlying_kind == SEC_ASN1_BIT_STRING) { 992 char byte; 993 /* 994 * Assume we have a length in bytes but we need to output 995 * a proper bit string. This interface only works for bit 996 * strings that are full multiples of 8. If support for 997 * real, variable length bit strings is needed then the 998 * caller will have to know to pass in a bit length instead 999 * of a byte length and then this code will have to 1000 * perform the encoding necessary (length written is length 1001 * in bytes plus 1, and the first octet of string is the 1002 * number of bits remaining between the end of the bit 1003 * string and the next byte boundary). 1004 */ 1005 sec_asn1e_write_length_bytes (state, len + 1, PR_FALSE); 1006 byte = 0; 1007 sec_asn1e_write_contents_bytes (state, &byte, 1); 1008 } else { 1009 sec_asn1e_write_length_bytes (state, len, PR_FALSE); 1010 } 1011 } 1012 sec_asn1e_write_contents_bytes (state, buf, len); 1013 state->top->status = needBytes; 1014 } else { 1015 switch (state->underlying_kind) { 1016 case SEC_ASN1_SET: 1017 case SEC_ASN1_SEQUENCE: 1018 PORT_Assert (0); 1019 break; 1020 1021 case SEC_ASN1_BIT_STRING: 1022 { 1023 SecAsn1Item *item; 1024 char rem; 1025 1026 item = (SecAsn1Item *)state->src; 1027 len = (item->Length + 7) >> 3; 1028 rem = (unsigned char)((len << 3) - item->Length); /* remaining bits */ 1029 sec_asn1e_write_contents_bytes (state, &rem, 1); 1030 sec_asn1e_write_contents_bytes (state, (char *) item->Data, 1031 len); 1032 } 1033 break; 1034 1035 case SEC_ASN1_BMP_STRING: 1036 /* The number of bytes must be divisable by 2 */ 1037 if ((((SecAsn1Item *)state->src)->Length) % 2) { 1038 SEC_ASN1EncoderContext *cx; 1039 1040 cx = state->top; 1041 cx->status = encodeError; 1042 break; 1043 } 1044 /* otherwise, fall through to write the content */ 1045 goto process_string; 1046 1047 case SEC_ASN1_UNIVERSAL_STRING: 1048 /* The number of bytes must be divisable by 4 */ 1049 if ((((SecAsn1Item *)state->src)->Length) % 4) { 1050 SEC_ASN1EncoderContext *cx; 1051 1052 cx = state->top; 1053 cx->status = encodeError; 1054 break; 1055 } 1056 /* otherwise, fall through to write the content */ 1057 goto process_string; 1058 1059 case SEC_ASN1_INTEGER: 1060 /* ASN.1 INTEGERs are signed. If the source is an unsigned 1061 * integer, the encoder will need to handle the conversion here. 1062 */ 1063 { 1064 size_t blen; 1065 unsigned char *intbuf; 1066 #ifdef __APPLE__ 1067 PRBool signedInt = state->signedInt; 1068 #else 1069 SECItemType integerType = ((SecAsn1Item *)state->src)->type; 1070 #endif 1071 blen = ((SecAsn1Item *)state->src)->Length; 1072 intbuf = ((SecAsn1Item *)state->src)->Data; 1073 while (blen > 0) { 1074 #ifdef __APPLE__ 1075 if (*intbuf & 0x80 && !signedInt) { 1076 #else 1077 if (*intbuf & 0x80 && integerType == siUnsignedInteger) { 1078 #endif 1079 char zero = 0; /* write a leading 0 */ 1080 sec_asn1e_write_contents_bytes(state, &zero, 1); 1081 /* and then the remaining buffer */ 1082 sec_asn1e_write_contents_bytes(state, 1083 (char *)intbuf, blen); 1084 break; 1085 } 1086 /* Check three possibilities: 1087 * 1. No leading zeros, msb of MSB is not 1; 1088 * 2. The number is zero itself; 1089 * 3. Encoding a signed integer with a leading zero, 1090 * keep the zero so that the number is positive. 1091 */ 1092 if (*intbuf != 0 || 1093 blen == 1 || 1094 #ifdef __APPLE__ 1095 (intbuf[1] & 0x80 && signedInt) ) 1096 #else 1097 (intbuf[1] & 0x80 && integerType != siUnsignedInteger) ) 1098 #endif 1099 { 1100 sec_asn1e_write_contents_bytes(state, 1101 (char *)intbuf, blen); 1102 break; 1103 } 1104 /* byte is 0, continue */ 1105 intbuf++; 1106 blen--; 1107 } 1108 } 1109 /* done with this content */ 1110 break; 1111 1112process_string: 1113 default: 1114 { 1115 SecAsn1Item *item; 1116 1117 item = (SecAsn1Item *)state->src; 1118 sec_asn1e_write_contents_bytes (state, (char *) item->Data, 1119 item->Length); 1120 } 1121 break; 1122 } 1123 state->place = afterContents; 1124 } 1125} 1126 1127 1128/* 1129 * We are doing a SET OF or SEQUENCE OF, and have just finished an item. 1130 */ 1131static void 1132sec_asn1e_next_in_group (sec_asn1e_state *state) 1133{ 1134 sec_asn1e_state *child; 1135 void **group; 1136 void *member; 1137 1138 PORT_Assert (state->place == duringGroup); 1139 PORT_Assert (state->child != NULL); 1140 1141 child = state->child; 1142 1143 group = *(void ***)state->src; 1144 1145 /* 1146 * Find placement of current item. 1147 */ 1148 member = (char *)(state->child->src) - child->theTemplate->offset; 1149 while (*group != member) 1150 group++; 1151 1152 /* 1153 * Move forward to next item. 1154 */ 1155 group++; 1156 if (*group == NULL) { 1157 /* 1158 * That was our last one; we are done now. 1159 */ 1160 child->place = notInUse; 1161 state->place = afterContents; 1162 return; 1163 } 1164 child->src = (char *)(*group) + child->theTemplate->offset; 1165 1166 /* 1167 * Re-"push" child. 1168 */ 1169 sec_asn1e_scrub_state (child); 1170 state->top->current = child; 1171} 1172 1173 1174/* 1175 * We are moving along through a sequence; move forward by one, 1176 * (detecting end-of-sequence when it happens). 1177 */ 1178static void 1179sec_asn1e_next_in_sequence (sec_asn1e_state *state) 1180{ 1181 sec_asn1e_state *child; 1182 1183 PORT_Assert (state->place == duringSequence); 1184 PORT_Assert (state->child != NULL); 1185 1186 child = state->child; 1187 1188 /* 1189 * Do the "after" field notification. 1190 */ 1191 sec_asn1e_notify_after (state->top, child->src, child->depth); 1192 1193 /* 1194 * Move forward. 1195 */ 1196 child->theTemplate++; 1197 if (child->theTemplate->kind == 0) { 1198 /* 1199 * We are done with this sequence. 1200 */ 1201 child->place = notInUse; 1202 state->place = afterContents; 1203 return; 1204 } 1205 1206 /* 1207 * Reset state and push. 1208 */ 1209 1210 child->src = (char *)state->src + child->theTemplate->offset; 1211 1212 /* 1213 * Do the "before" field notification. 1214 */ 1215 sec_asn1e_notify_before (state->top, child->src, child->depth); 1216 1217 state->top->current = child; 1218 (void) sec_asn1e_init_state_based_on_template (child); 1219} 1220 1221 1222static void 1223sec_asn1e_after_contents (sec_asn1e_state *state) 1224{ 1225 PORT_Assert (state->place == afterContents); 1226 1227 if (state->indefinite) 1228 sec_asn1e_write_end_of_contents_bytes (state); 1229 1230 /* 1231 * Just make my parent be the current state. It will then clean 1232 * up after me and free me (or reuse me). 1233 */ 1234 state->top->current = state->parent; 1235} 1236 1237 1238/* 1239 * This function is called whether or not we are streaming; if we 1240 * *are* streaming, our caller can also instruct us to take bytes 1241 * from the passed-in buffer (at buf, for length len, which is likely 1242 * bytes but could even mean bits if the current field is a bit string). 1243 * If we have been so instructed, we will gobble up bytes from there 1244 * (rather than from our src structure) and output them, and then 1245 * we will just return, expecting to be called again -- either with 1246 * more bytes or after our caller has instructed us that we are done 1247 * (for now) with the buffer. 1248 */ 1249SECStatus 1250SEC_ASN1EncoderUpdate (SEC_ASN1EncoderContext *cx, 1251 const char *buf, unsigned long len) 1252{ 1253 sec_asn1e_state *state; 1254 1255 if (cx->status == needBytes) { 1256 PORT_Assert (buf != NULL && len != 0); 1257 cx->status = keepGoing; 1258 } 1259 1260 while (cx->status == keepGoing) { 1261 state = cx->current; 1262 switch (state->place) { 1263 case beforeHeader: 1264 sec_asn1e_write_header (state); 1265 break; 1266 case duringContents: 1267 sec_asn1e_write_contents (state, buf, len); 1268 break; 1269 case duringGroup: 1270 sec_asn1e_next_in_group (state); 1271 break; 1272 case duringSequence: 1273 sec_asn1e_next_in_sequence (state); 1274 break; 1275 case afterContents: 1276 sec_asn1e_after_contents (state); 1277 break; 1278 case afterImplicit: 1279 case afterInline: 1280 case afterPointer: 1281 case afterChoice: 1282 /* 1283 * These states are more documentation than anything. 1284 * They just need to force a pop. 1285 */ 1286 PORT_Assert (!state->indefinite); 1287 state->place = afterContents; 1288 break; 1289 case notInUse: 1290 default: 1291 /* This is not an error, but rather a plain old BUG! */ 1292 PORT_Assert (0); 1293 cx->status = encodeError; 1294 break; 1295 } 1296 1297 if (cx->status == encodeError) 1298 break; 1299 1300 /* It might have changed, so we have to update our local copy. */ 1301 state = cx->current; 1302 1303 /* If it is NULL, we have popped all the way to the top. */ 1304 if (state == NULL) { 1305 cx->status = allDone; 1306 break; 1307 } 1308 } 1309 1310 if (cx->status == encodeError) { 1311 return SECFailure; 1312 } 1313 1314 return SECSuccess; 1315} 1316 1317 1318void 1319SEC_ASN1EncoderFinish (SEC_ASN1EncoderContext *cx) 1320{ 1321 /* 1322 * XXX anything else that needs to be finished? 1323 */ 1324 1325 PORT_FreeArena (cx->our_pool, PR_FALSE); 1326} 1327 1328 1329SEC_ASN1EncoderContext * 1330SEC_ASN1EncoderStart (const void *src, const SecAsn1Template *theTemplate, 1331 SEC_ASN1WriteProc output_proc, void *output_arg) 1332{ 1333 PRArenaPool *our_pool; 1334 SEC_ASN1EncoderContext *cx; 1335 1336 our_pool = PORT_NewArena (SEC_ASN1_DEFAULT_ARENA_SIZE); 1337 if (our_pool == NULL) 1338 return NULL; 1339 1340 cx = (SEC_ASN1EncoderContext*)PORT_ArenaZAlloc (our_pool, sizeof(*cx)); 1341 if (cx == NULL) { 1342 PORT_FreeArena (our_pool, PR_FALSE); 1343 return NULL; 1344 } 1345 1346 cx->our_pool = our_pool; 1347 cx->output_proc = output_proc; 1348 cx->output_arg = output_arg; 1349 1350 cx->status = keepGoing; 1351 1352 if (sec_asn1e_push_state(cx, theTemplate, src, PR_FALSE) == NULL 1353 || sec_asn1e_init_state_based_on_template (cx->current) == NULL) { 1354 /* 1355 * Trouble initializing (probably due to failed allocations) 1356 * requires that we just give up. 1357 */ 1358 PORT_FreeArena (our_pool, PR_FALSE); 1359 return NULL; 1360 } 1361 1362 return cx; 1363} 1364 1365 1366/* 1367 * XXX Do we need a FilterProc, too? 1368 */ 1369 1370 1371void 1372SEC_ASN1EncoderSetNotifyProc (SEC_ASN1EncoderContext *cx, 1373 SEC_ASN1NotifyProc fn, void *arg) 1374{ 1375 cx->notify_proc = fn; 1376 cx->notify_arg = arg; 1377} 1378 1379 1380void 1381SEC_ASN1EncoderClearNotifyProc (SEC_ASN1EncoderContext *cx) 1382{ 1383 cx->notify_proc = NULL; 1384 cx->notify_arg = NULL; /* not necessary; just being clean */ 1385} 1386 1387 1388void 1389SEC_ASN1EncoderAbort(SEC_ASN1EncoderContext *cx, int error) 1390{ 1391 PORT_Assert(cx); 1392 PORT_SetError(error); 1393 cx->status = encodeError; 1394} 1395 1396 1397void 1398SEC_ASN1EncoderSetStreaming (SEC_ASN1EncoderContext *cx) 1399{ 1400 /* XXX is there a way to check that we are "between" fields here? */ 1401 1402 cx->streaming = PR_TRUE; 1403} 1404 1405 1406void 1407SEC_ASN1EncoderClearStreaming (SEC_ASN1EncoderContext *cx) 1408{ 1409 /* XXX is there a way to check that we are "between" fields here? */ 1410 1411 cx->streaming = PR_FALSE; 1412} 1413 1414 1415void 1416SEC_ASN1EncoderSetTakeFromBuf (SEC_ASN1EncoderContext *cx) 1417{ 1418 /* 1419 * XXX is there a way to check that we are "between" fields here? this 1420 * needs to include a check for being in between groups of items in 1421 * a SET_OF or SEQUENCE_OF. 1422 */ 1423 PORT_Assert (cx->streaming); 1424 1425 cx->from_buf = PR_TRUE; 1426} 1427 1428 1429void 1430SEC_ASN1EncoderClearTakeFromBuf (SEC_ASN1EncoderContext *cx) 1431{ 1432 /* we should actually be taking from buf *now* */ 1433 PORT_Assert (cx->from_buf); 1434 if (! cx->from_buf) /* if not, just do nothing */ 1435 return; 1436 1437 cx->from_buf = PR_FALSE; 1438 1439 if (cx->status == needBytes) { 1440 cx->status = keepGoing; 1441 cx->current->place = afterContents; 1442 } 1443} 1444 1445 1446SECStatus 1447SEC_ASN1Encode (const void *src, const SecAsn1Template *theTemplate, 1448 SEC_ASN1WriteProc output_proc, void *output_arg) 1449{ 1450 SEC_ASN1EncoderContext *ecx; 1451 SECStatus rv; 1452 1453 ecx = SEC_ASN1EncoderStart (src, theTemplate, output_proc, output_arg); 1454 if (ecx == NULL) 1455 return SECFailure; 1456 1457 rv = SEC_ASN1EncoderUpdate (ecx, NULL, 0); 1458 1459 SEC_ASN1EncoderFinish (ecx); 1460 return rv; 1461} 1462 1463 1464/* 1465 * XXX depth and data_kind are unused; is there a PC way to silence warnings? 1466 * (I mean "politically correct", not anything to do with intel/win platform) 1467 */ 1468void 1469sec_asn1e_encode_item_count (void *arg, const char *buf, size_t len, 1470 int depth, SEC_ASN1EncodingPart data_kind) 1471{ 1472 size_t *count; 1473 1474 count = (unsigned long*)arg; 1475 PORT_Assert (count != NULL); 1476 1477 *count += len; 1478} 1479 1480 1481/* XXX depth and data_kind are unused; is there a PC way to silence warnings? */ 1482void 1483sec_asn1e_encode_item_store (void *arg, const char *buf, size_t len, 1484 int depth, SEC_ASN1EncodingPart data_kind) 1485{ 1486 SecAsn1Item *dest; 1487 1488 dest = (SecAsn1Item*)arg; 1489 PORT_Assert (dest != NULL); 1490 1491 PORT_Memcpy (dest->Data + dest->Length, buf, len); 1492 dest->Length += len; 1493} 1494 1495 1496/* 1497 * Allocate an entire SecAsn1Item, or just the data part of it, to hold 1498 * "len" bytes of stuff. Allocate from the given pool, if specified, 1499 * otherwise just do a vanilla PORT_Alloc. 1500 * 1501 * XXX This seems like a reasonable general-purpose function (for SECITEM_)? 1502 */ 1503SecAsn1Item * 1504sec_asn1e_allocate_item (PRArenaPool *poolp, SecAsn1Item *dest, unsigned long len) 1505{ 1506 if (poolp != NULL) { 1507 void *release; 1508 1509 release = PORT_ArenaMark (poolp); 1510 if (dest == NULL) 1511 dest = (SecAsn1Item*)PORT_ArenaAlloc (poolp, sizeof(SecAsn1Item)); 1512 if (dest != NULL) { 1513 dest->Data = (unsigned char*)PORT_ArenaAlloc (poolp, len); 1514 if (dest->Data == NULL) { 1515 dest = NULL; 1516 } 1517 } 1518 if (dest == NULL) { 1519 /* one or both allocations failed; release everything */ 1520 PORT_ArenaRelease (poolp, release); 1521 } else { 1522 /* everything okay; unmark the arena */ 1523 PORT_ArenaUnmark (poolp, release); 1524 } 1525 } else { 1526 SecAsn1Item *indest; 1527 1528 indest = dest; 1529 if (dest == NULL) 1530 dest = (SecAsn1Item*)PORT_Alloc (sizeof(SecAsn1Item)); 1531 if (dest != NULL) { 1532 #ifndef __APPLE__ 1533 dest->type = siBuffer; 1534 #endif 1535 dest->Data = (unsigned char*)PORT_Alloc (len); 1536 if (dest->Data == NULL) { 1537 if (indest == NULL) 1538 PORT_Free (dest); 1539 dest = NULL; 1540 } 1541 } 1542 } 1543 1544 return dest; 1545} 1546 1547 1548SecAsn1Item * 1549SEC_ASN1EncodeItem (PRArenaPool *poolp, SecAsn1Item *dest, const void *src, 1550 const SecAsn1Template *theTemplate) 1551{ 1552 unsigned long encoding_length; 1553 SECStatus rv; 1554 1555 PORT_Assert (dest == NULL || dest->Data == NULL); 1556 1557 encoding_length = 0; 1558 rv = SEC_ASN1Encode (src, theTemplate, 1559 sec_asn1e_encode_item_count, &encoding_length); 1560 if (rv != SECSuccess) 1561 return NULL; 1562 1563 dest = sec_asn1e_allocate_item (poolp, dest, encoding_length); 1564 if (dest == NULL) 1565 return NULL; 1566 1567 /* XXX necessary? This really just checks for a bug in the allocate fn */ 1568 PORT_Assert (dest->Data != NULL); 1569 if (dest->Data == NULL) 1570 return NULL; 1571 1572 dest->Length = 0; 1573 (void) SEC_ASN1Encode (src, theTemplate, sec_asn1e_encode_item_store, dest); 1574 1575 PORT_Assert (encoding_length == dest->Length); 1576 return dest; 1577} 1578 1579 1580static SecAsn1Item * 1581sec_asn1e_integer(PRArenaPool *poolp, SecAsn1Item *dest, unsigned long value, 1582 PRBool make_unsigned) 1583{ 1584 unsigned long copy; 1585 unsigned char sign; 1586 int len = 0; 1587 1588 /* 1589 * Determine the length of the encoded value (minimum of 1). 1590 */ 1591 copy = value; 1592 do { 1593 len++; 1594 sign = (unsigned char)(copy & 0x80); 1595 copy >>= 8; 1596 } while (copy); 1597 1598 /* 1599 * If this is an unsigned encoding, and the high bit of the last 1600 * byte we counted was set, we need to add one to the length so 1601 * we put a high-order zero byte in the encoding. 1602 */ 1603 if (sign && make_unsigned) 1604 len++; 1605 1606 /* 1607 * Allocate the item (if necessary) and the data pointer within. 1608 */ 1609 dest = sec_asn1e_allocate_item (poolp, dest, len); 1610 if (dest == NULL) 1611 return NULL; 1612 1613 /* 1614 * Store the value, byte by byte, in the item. 1615 */ 1616 dest->Length = len; 1617 while (len) { 1618 dest->Data[--len] = (unsigned char)value; 1619 value >>= 8; 1620 } 1621 PORT_Assert (value == 0); 1622 1623 return dest; 1624} 1625 1626 1627SecAsn1Item * 1628SEC_ASN1EncodeInteger(PRArenaPool *poolp, SecAsn1Item *dest, long value) 1629{ 1630 return sec_asn1e_integer (poolp, dest, (unsigned long) value, PR_FALSE); 1631} 1632 1633 1634extern SecAsn1Item * 1635SEC_ASN1EncodeUnsignedInteger(PRArenaPool *poolp, 1636 SecAsn1Item *dest, unsigned long value) 1637{ 1638 return sec_asn1e_integer (poolp, dest, value, PR_TRUE); 1639} 1640