/usr/share/php/File/ASN1.php is in php-seclib 1.0.9-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 | <?php
/**
* Pure-PHP ASN.1 Parser
*
* PHP versions 4 and 5
*
* ASN.1 provides the semantics for data encoded using various schemes. The most commonly
* utilized scheme is DER or the "Distinguished Encoding Rules". PEM's are base64 encoded
* DER blobs.
*
* File_ASN1 decodes and encodes DER formatted messages and places them in a semantic context.
*
* Uses the 1988 ASN.1 syntax.
*
* LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
* @category File
* @package File_ASN1
* @author Jim Wigginton <terrafrost@php.net>
* @copyright 2012 Jim Wigginton
* @license http://www.opensource.org/licenses/mit-license.html MIT License
* @link http://phpseclib.sourceforge.net
*/
/**#@+
* Tag Classes
*
* @access private
* @link http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf#page=12
*/
define('FILE_ASN1_CLASS_UNIVERSAL', 0);
define('FILE_ASN1_CLASS_APPLICATION', 1);
define('FILE_ASN1_CLASS_CONTEXT_SPECIFIC', 2);
define('FILE_ASN1_CLASS_PRIVATE', 3);
/**#@-*/
/**#@+
* Tag Classes
*
* @access private
* @link http://www.obj-sys.com/asn1tutorial/node124.html
*/
define('FILE_ASN1_TYPE_BOOLEAN', 1);
define('FILE_ASN1_TYPE_INTEGER', 2);
define('FILE_ASN1_TYPE_BIT_STRING', 3);
define('FILE_ASN1_TYPE_OCTET_STRING', 4);
define('FILE_ASN1_TYPE_NULL', 5);
define('FILE_ASN1_TYPE_OBJECT_IDENTIFIER', 6);
//define('FILE_ASN1_TYPE_OBJECT_DESCRIPTOR', 7);
//define('FILE_ASN1_TYPE_INSTANCE_OF', 8); // EXTERNAL
define('FILE_ASN1_TYPE_REAL', 9);
define('FILE_ASN1_TYPE_ENUMERATED', 10);
//define('FILE_ASN1_TYPE_EMBEDDED', 11);
define('FILE_ASN1_TYPE_UTF8_STRING', 12);
//define('FILE_ASN1_TYPE_RELATIVE_OID', 13);
define('FILE_ASN1_TYPE_SEQUENCE', 16); // SEQUENCE OF
define('FILE_ASN1_TYPE_SET', 17); // SET OF
/**#@-*/
/**#@+
* More Tag Classes
*
* @access private
* @link http://www.obj-sys.com/asn1tutorial/node10.html
*/
define('FILE_ASN1_TYPE_NUMERIC_STRING', 18);
define('FILE_ASN1_TYPE_PRINTABLE_STRING', 19);
define('FILE_ASN1_TYPE_TELETEX_STRING', 20); // T61String
define('FILE_ASN1_TYPE_VIDEOTEX_STRING', 21);
define('FILE_ASN1_TYPE_IA5_STRING', 22);
define('FILE_ASN1_TYPE_UTC_TIME', 23);
define('FILE_ASN1_TYPE_GENERALIZED_TIME', 24);
define('FILE_ASN1_TYPE_GRAPHIC_STRING', 25);
define('FILE_ASN1_TYPE_VISIBLE_STRING', 26); // ISO646String
define('FILE_ASN1_TYPE_GENERAL_STRING', 27);
define('FILE_ASN1_TYPE_UNIVERSAL_STRING', 28);
//define('FILE_ASN1_TYPE_CHARACTER_STRING', 29);
define('FILE_ASN1_TYPE_BMP_STRING', 30);
/**#@-*/
/**#@+
* Tag Aliases
*
* These tags are kinda place holders for other tags.
*
* @access private
*/
define('FILE_ASN1_TYPE_CHOICE', -1);
define('FILE_ASN1_TYPE_ANY', -2);
/**#@-*/
/**
* ASN.1 Element
*
* Bypass normal encoding rules in File_ASN1::encodeDER()
*
* @package File_ASN1
* @author Jim Wigginton <terrafrost@php.net>
* @access public
*/
class File_ASN1_Element
{
/**
* Raw element value
*
* @var string
* @access private
*/
var $element;
/**
* Constructor
*
* @param string $encoded
* @return File_ASN1_Element
* @access public
*/
function __construct($encoded)
{
$this->element = $encoded;
}
/**
* PHP4 compatible Default Constructor.
*
* @see self::__construct()
* @param int $mode
* @access public
*/
function File_ASN1_Element($encoded)
{
$this->__construct($encoded);
}
}
/**
* Pure-PHP ASN.1 Parser
*
* @package File_ASN1
* @author Jim Wigginton <terrafrost@php.net>
* @access public
*/
class File_ASN1
{
/**
* ASN.1 object identifier
*
* @var array
* @access private
* @link http://en.wikipedia.org/wiki/Object_identifier
*/
var $oids = array();
/**
* Default date format
*
* @var string
* @access private
* @link http://php.net/class.datetime
*/
var $format = 'D, d M Y H:i:s O';
/**
* Default date format
*
* @var array
* @access private
* @see self::setTimeFormat()
* @see self::asn1map()
* @link http://php.net/class.datetime
*/
var $encoded;
/**
* Filters
*
* If the mapping type is FILE_ASN1_TYPE_ANY what do we actually encode it as?
*
* @var array
* @access private
* @see self::_encode_der()
*/
var $filters;
/**
* Type mapping table for the ANY type.
*
* Structured or unknown types are mapped to a FILE_ASN1_Element.
* Unambiguous types get the direct mapping (int/real/bool).
* Others are mapped as a choice, with an extra indexing level.
*
* @var array
* @access public
*/
var $ANYmap = array(
FILE_ASN1_TYPE_BOOLEAN => true,
FILE_ASN1_TYPE_INTEGER => true,
FILE_ASN1_TYPE_BIT_STRING => 'bitString',
FILE_ASN1_TYPE_OCTET_STRING => 'octetString',
FILE_ASN1_TYPE_NULL => 'null',
FILE_ASN1_TYPE_OBJECT_IDENTIFIER => 'objectIdentifier',
FILE_ASN1_TYPE_REAL => true,
FILE_ASN1_TYPE_ENUMERATED => 'enumerated',
FILE_ASN1_TYPE_UTF8_STRING => 'utf8String',
FILE_ASN1_TYPE_NUMERIC_STRING => 'numericString',
FILE_ASN1_TYPE_PRINTABLE_STRING => 'printableString',
FILE_ASN1_TYPE_TELETEX_STRING => 'teletexString',
FILE_ASN1_TYPE_VIDEOTEX_STRING => 'videotexString',
FILE_ASN1_TYPE_IA5_STRING => 'ia5String',
FILE_ASN1_TYPE_UTC_TIME => 'utcTime',
FILE_ASN1_TYPE_GENERALIZED_TIME => 'generalTime',
FILE_ASN1_TYPE_GRAPHIC_STRING => 'graphicString',
FILE_ASN1_TYPE_VISIBLE_STRING => 'visibleString',
FILE_ASN1_TYPE_GENERAL_STRING => 'generalString',
FILE_ASN1_TYPE_UNIVERSAL_STRING => 'universalString',
//FILE_ASN1_TYPE_CHARACTER_STRING => 'characterString',
FILE_ASN1_TYPE_BMP_STRING => 'bmpString'
);
/**
* String type to character size mapping table.
*
* Non-convertable types are absent from this table.
* size == 0 indicates variable length encoding.
*
* @var array
* @access public
*/
var $stringTypeSize = array(
FILE_ASN1_TYPE_UTF8_STRING => 0,
FILE_ASN1_TYPE_BMP_STRING => 2,
FILE_ASN1_TYPE_UNIVERSAL_STRING => 4,
FILE_ASN1_TYPE_PRINTABLE_STRING => 1,
FILE_ASN1_TYPE_TELETEX_STRING => 1,
FILE_ASN1_TYPE_IA5_STRING => 1,
FILE_ASN1_TYPE_VISIBLE_STRING => 1,
);
/**
* Default Constructor.
*
* @access public
*/
function __construct()
{
static $static_init = null;
if (!$static_init) {
$static_init = true;
if (!class_exists('Math_BigInteger')) {
include_once 'Math/BigInteger.php';
}
}
}
/**
* PHP4 compatible Default Constructor.
*
* @see self::__construct()
* @access public
*/
function File_ASN1()
{
$this->__construct($mode);
}
/**
* Parse BER-encoding
*
* Serves a similar purpose to openssl's asn1parse
*
* @param string $encoded
* @return array
* @access public
*/
function decodeBER($encoded)
{
if (is_object($encoded) && strtolower(get_class($encoded)) == 'file_asn1_element') {
$encoded = $encoded->element;
}
$this->encoded = $encoded;
// encapsulate in an array for BC with the old decodeBER
return array($this->_decode_ber($encoded));
}
/**
* Parse BER-encoding (Helper function)
*
* Sometimes we want to get the BER encoding of a particular tag. $start lets us do that without having to reencode.
* $encoded is passed by reference for the recursive calls done for FILE_ASN1_TYPE_BIT_STRING and
* FILE_ASN1_TYPE_OCTET_STRING. In those cases, the indefinite length is used.
*
* @param string $encoded
* @param int $start
* @param int $encoded_pos
* @return array
* @access private
*/
function _decode_ber($encoded, $start = 0, $encoded_pos = 0)
{
$current = array('start' => $start);
$type = ord($encoded[$encoded_pos++]);
$start++;
$constructed = ($type >> 5) & 1;
$tag = $type & 0x1F;
if ($tag == 0x1F) {
$tag = 0;
// process septets (since the eighth bit is ignored, it's not an octet)
do {
$loop = ord($encoded[0]) >> 7;
$tag <<= 7;
$tag |= ord($encoded[$encoded_pos++]) & 0x7F;
$start++;
} while ($loop);
}
// Length, as discussed in paragraph 8.1.3 of X.690-0207.pdf#page=13
$length = ord($encoded[$encoded_pos++]);
$start++;
if ($length == 0x80) { // indefinite length
// "[A sender shall] use the indefinite form (see 8.1.3.6) if the encoding is constructed and is not all
// immediately available." -- paragraph 8.1.3.2.c
$length = strlen($encoded) - $encoded_pos;
} elseif ($length & 0x80) { // definite length, long form
// technically, the long form of the length can be represented by up to 126 octets (bytes), but we'll only
// support it up to four.
$length&= 0x7F;
$temp = substr($encoded, $encoded_pos, $length);
$encoded_pos += $length;
// tags of indefinte length don't really have a header length; this length includes the tag
$current+= array('headerlength' => $length + 2);
$start+= $length;
extract(unpack('Nlength', substr(str_pad($temp, 4, chr(0), STR_PAD_LEFT), -4)));
} else {
$current+= array('headerlength' => 2);
}
if ($length > (strlen($encoded) - $encoded_pos)) {
return false;
}
$content = substr($encoded, $encoded_pos, $length);
$content_pos = 0;
// at this point $length can be overwritten. it's only accurate for definite length things as is
/* Class is UNIVERSAL, APPLICATION, PRIVATE, or CONTEXT-SPECIFIC. The UNIVERSAL class is restricted to the ASN.1
built-in types. It defines an application-independent data type that must be distinguishable from all other
data types. The other three classes are user defined. The APPLICATION class distinguishes data types that
have a wide, scattered use within a particular presentation context. PRIVATE distinguishes data types within
a particular organization or country. CONTEXT-SPECIFIC distinguishes members of a sequence or set, the
alternatives of a CHOICE, or universally tagged set members. Only the class number appears in braces for this
data type; the term CONTEXT-SPECIFIC does not appear.
-- http://www.obj-sys.com/asn1tutorial/node12.html */
$class = ($type >> 6) & 3;
switch ($class) {
case FILE_ASN1_CLASS_APPLICATION:
case FILE_ASN1_CLASS_PRIVATE:
case FILE_ASN1_CLASS_CONTEXT_SPECIFIC:
if (!$constructed) {
return array(
'type' => $class,
'constant' => $tag,
'content' => $content,
'length' => $length + $start - $current['start']
);
}
$newcontent = array();
$remainingLength = $length;
while ($remainingLength > 0) {
$temp = $this->_decode_ber($content, $start, $content_pos);
$length = $temp['length'];
// end-of-content octets - see paragraph 8.1.5
if (substr($content, $content_pos + $length, 2) == "\0\0") {
$length+= 2;
$start+= $length;
$newcontent[] = $temp;
break;
}
$start+= $length;
$remainingLength-= $length;
$newcontent[] = $temp;
$content_pos += $length;
}
return array(
'type' => $class,
'constant' => $tag,
// the array encapsulation is for BC with the old format
'content' => $newcontent,
// the only time when $content['headerlength'] isn't defined is when the length is indefinite.
// the absence of $content['headerlength'] is how we know if something is indefinite or not.
// technically, it could be defined to be 2 and then another indicator could be used but whatever.
'length' => $start - $current['start']
) + $current;
}
$current+= array('type' => $tag);
// decode UNIVERSAL tags
switch ($tag) {
case FILE_ASN1_TYPE_BOOLEAN:
// "The contents octets shall consist of a single octet." -- paragraph 8.2.1
//if (strlen($content) != 1) {
// return false;
//}
$current['content'] = (bool) ord($content[$content_pos]);
break;
case FILE_ASN1_TYPE_INTEGER:
case FILE_ASN1_TYPE_ENUMERATED:
$current['content'] = new Math_BigInteger(substr($content, $content_pos), -256);
break;
case FILE_ASN1_TYPE_REAL: // not currently supported
return false;
case FILE_ASN1_TYPE_BIT_STRING:
// The initial octet shall encode, as an unsigned binary integer with bit 1 as the least significant bit,
// the number of unused bits in the final subsequent octet. The number shall be in the range zero to
// seven.
if (!$constructed) {
$current['content'] = substr($content, $content_pos);
} else {
$temp = $this->_decode_ber($content, $start, $content_pos);
$length-= (strlen($content) - $content_pos);
$last = count($temp) - 1;
for ($i = 0; $i < $last; $i++) {
// all subtags should be bit strings
//if ($temp[$i]['type'] != FILE_ASN1_TYPE_BIT_STRING) {
// return false;
//}
$current['content'].= substr($temp[$i]['content'], 1);
}
// all subtags should be bit strings
//if ($temp[$last]['type'] != FILE_ASN1_TYPE_BIT_STRING) {
// return false;
//}
$current['content'] = $temp[$last]['content'][0] . $current['content'] . substr($temp[$i]['content'], 1);
}
break;
case FILE_ASN1_TYPE_OCTET_STRING:
if (!$constructed) {
$current['content'] = substr($content, $content_pos);
} else {
$current['content'] = '';
$length = 0;
while (substr($content, $content_pos, 2) != "\0\0") {
$temp = $this->_decode_ber($content, $length + $start, $content_pos);
$content_pos += $temp['length'];
// all subtags should be octet strings
//if ($temp['type'] != FILE_ASN1_TYPE_OCTET_STRING) {
// return false;
//}
$current['content'].= $temp['content'];
$length+= $temp['length'];
}
if (substr($content, $content_pos, 2) == "\0\0") {
$length+= 2; // +2 for the EOC
}
}
break;
case FILE_ASN1_TYPE_NULL:
// "The contents octets shall not contain any octets." -- paragraph 8.8.2
//if (strlen($content)) {
// return false;
//}
break;
case FILE_ASN1_TYPE_SEQUENCE:
case FILE_ASN1_TYPE_SET:
$offset = 0;
$current['content'] = array();
$content_len = strlen($content);
while ($content_pos < $content_len) {
// if indefinite length construction was used and we have an end-of-content string next
// see paragraphs 8.1.1.3, 8.1.3.2, 8.1.3.6, 8.1.5, and (for an example) 8.6.4.2
if (!isset($current['headerlength']) && substr($content, $content_pos, 2) == "\0\0") {
$length = $offset + 2; // +2 for the EOC
break 2;
}
$temp = $this->_decode_ber($content, $start + $offset, $content_pos);
$content_pos += $temp['length'];
$current['content'][] = $temp;
$offset+= $temp['length'];
}
break;
case FILE_ASN1_TYPE_OBJECT_IDENTIFIER:
$temp = ord($content[$content_pos++]);
$current['content'] = sprintf('%d.%d', floor($temp / 40), $temp % 40);
$valuen = 0;
// process septets
$content_len = strlen($content);
while ($content_pos < $content_len) {
$temp = ord($content[$content_pos++]);
$valuen <<= 7;
$valuen |= $temp & 0x7F;
if (~$temp & 0x80) {
$current['content'].= ".$valuen";
$valuen = 0;
}
}
// the eighth bit of the last byte should not be 1
//if ($temp >> 7) {
// return false;
//}
break;
/* Each character string type shall be encoded as if it had been declared:
[UNIVERSAL x] IMPLICIT OCTET STRING
-- X.690-0207.pdf#page=23 (paragraph 8.21.3)
Per that, we're not going to do any validation. If there are any illegal characters in the string,
we don't really care */
case FILE_ASN1_TYPE_NUMERIC_STRING:
// 0,1,2,3,4,5,6,7,8,9, and space
case FILE_ASN1_TYPE_PRINTABLE_STRING:
// Upper and lower case letters, digits, space, apostrophe, left/right parenthesis, plus sign, comma,
// hyphen, full stop, solidus, colon, equal sign, question mark
case FILE_ASN1_TYPE_TELETEX_STRING:
// The Teletex character set in CCITT's T61, space, and delete
// see http://en.wikipedia.org/wiki/Teletex#Character_sets
case FILE_ASN1_TYPE_VIDEOTEX_STRING:
// The Videotex character set in CCITT's T.100 and T.101, space, and delete
case FILE_ASN1_TYPE_VISIBLE_STRING:
// Printing character sets of international ASCII, and space
case FILE_ASN1_TYPE_IA5_STRING:
// International Alphabet 5 (International ASCII)
case FILE_ASN1_TYPE_GRAPHIC_STRING:
// All registered G sets, and space
case FILE_ASN1_TYPE_GENERAL_STRING:
// All registered C and G sets, space and delete
case FILE_ASN1_TYPE_UTF8_STRING:
// ????
case FILE_ASN1_TYPE_BMP_STRING:
$current['content'] = substr($content, $content_pos);
break;
case FILE_ASN1_TYPE_UTC_TIME:
case FILE_ASN1_TYPE_GENERALIZED_TIME:
$current['content'] = class_exists('DateTime') ?
$this->_decodeDateTime(substr($content, $content_pos), $tag) :
$this->_decodeUnixTime(substr($content, $content_pos), $tag);
default:
}
$start+= $length;
// ie. length is the length of the full TLV encoding - it's not just the length of the value
return $current + array('length' => $start - $current['start']);
}
/**
* ASN.1 Map
*
* Provides an ASN.1 semantic mapping ($mapping) from a parsed BER-encoding to a human readable format.
*
* "Special" mappings may be applied on a per tag-name basis via $special.
*
* @param array $decoded
* @param array $mapping
* @param array $special
* @return array
* @access public
*/
function asn1map($decoded, $mapping, $special = array())
{
if (isset($mapping['explicit']) && is_array($decoded['content'])) {
$decoded = $decoded['content'][0];
}
switch (true) {
case $mapping['type'] == FILE_ASN1_TYPE_ANY:
$intype = $decoded['type'];
if (isset($decoded['constant']) || !isset($this->ANYmap[$intype]) || (ord($this->encoded[$decoded['start']]) & 0x20)) {
return new File_ASN1_Element(substr($this->encoded, $decoded['start'], $decoded['length']));
}
$inmap = $this->ANYmap[$intype];
if (is_string($inmap)) {
return array($inmap => $this->asn1map($decoded, array('type' => $intype) + $mapping, $special));
}
break;
case $mapping['type'] == FILE_ASN1_TYPE_CHOICE:
foreach ($mapping['children'] as $key => $option) {
switch (true) {
case isset($option['constant']) && $option['constant'] == $decoded['constant']:
case !isset($option['constant']) && $option['type'] == $decoded['type']:
$value = $this->asn1map($decoded, $option, $special);
break;
case !isset($option['constant']) && $option['type'] == FILE_ASN1_TYPE_CHOICE:
$v = $this->asn1map($decoded, $option, $special);
if (isset($v)) {
$value = $v;
}
}
if (isset($value)) {
if (isset($special[$key])) {
$value = call_user_func($special[$key], $value);
}
return array($key => $value);
}
}
return null;
case isset($mapping['implicit']):
case isset($mapping['explicit']):
case $decoded['type'] == $mapping['type']:
break;
default:
// if $decoded['type'] and $mapping['type'] are both strings, but different types of strings,
// let it through
switch (true) {
case $decoded['type'] < 18: // FILE_ASN1_TYPE_NUMERIC_STRING == 18
case $decoded['type'] > 30: // FILE_ASN1_TYPE_BMP_STRING == 30
case $mapping['type'] < 18:
case $mapping['type'] > 30:
return null;
}
}
if (isset($mapping['implicit'])) {
$decoded['type'] = $mapping['type'];
}
switch ($decoded['type']) {
case FILE_ASN1_TYPE_SEQUENCE:
$map = array();
// ignore the min and max
if (isset($mapping['min']) && isset($mapping['max'])) {
$child = $mapping['children'];
foreach ($decoded['content'] as $content) {
if (($map[] = $this->asn1map($content, $child, $special)) === null) {
return null;
}
}
return $map;
}
$n = count($decoded['content']);
$i = 0;
foreach ($mapping['children'] as $key => $child) {
$maymatch = $i < $n; // Match only existing input.
if ($maymatch) {
$temp = $decoded['content'][$i];
if ($child['type'] != FILE_ASN1_TYPE_CHOICE) {
// Get the mapping and input class & constant.
$childClass = $tempClass = FILE_ASN1_CLASS_UNIVERSAL;
$constant = null;
if (isset($temp['constant'])) {
$tempClass = isset($temp['class']) ? $temp['class'] : FILE_ASN1_CLASS_CONTEXT_SPECIFIC;
}
if (isset($child['class'])) {
$childClass = $child['class'];
$constant = $child['cast'];
} elseif (isset($child['constant'])) {
$childClass = FILE_ASN1_CLASS_CONTEXT_SPECIFIC;
$constant = $child['constant'];
}
if (isset($constant) && isset($temp['constant'])) {
// Can only match if constants and class match.
$maymatch = $constant == $temp['constant'] && $childClass == $tempClass;
} else {
// Can only match if no constant expected and type matches or is generic.
$maymatch = !isset($child['constant']) && array_search($child['type'], array($temp['type'], FILE_ASN1_TYPE_ANY, FILE_ASN1_TYPE_CHOICE)) !== false;
}
}
}
if ($maymatch) {
// Attempt submapping.
$candidate = $this->asn1map($temp, $child, $special);
$maymatch = $candidate !== null;
}
if ($maymatch) {
// Got the match: use it.
if (isset($special[$key])) {
$candidate = call_user_func($special[$key], $candidate);
}
$map[$key] = $candidate;
$i++;
} elseif (isset($child['default'])) {
$map[$key] = $child['default']; // Use default.
} elseif (!isset($child['optional'])) {
return null; // Syntax error.
}
}
// Fail mapping if all input items have not been consumed.
return $i < $n ? null: $map;
// the main diff between sets and sequences is the encapsulation of the foreach in another for loop
case FILE_ASN1_TYPE_SET:
$map = array();
// ignore the min and max
if (isset($mapping['min']) && isset($mapping['max'])) {
$child = $mapping['children'];
foreach ($decoded['content'] as $content) {
if (($map[] = $this->asn1map($content, $child, $special)) === null) {
return null;
}
}
return $map;
}
for ($i = 0; $i < count($decoded['content']); $i++) {
$temp = $decoded['content'][$i];
$tempClass = FILE_ASN1_CLASS_UNIVERSAL;
if (isset($temp['constant'])) {
$tempClass = isset($temp['class']) ? $temp['class'] : FILE_ASN1_CLASS_CONTEXT_SPECIFIC;
}
foreach ($mapping['children'] as $key => $child) {
if (isset($map[$key])) {
continue;
}
$maymatch = true;
if ($child['type'] != FILE_ASN1_TYPE_CHOICE) {
$childClass = FILE_ASN1_CLASS_UNIVERSAL;
$constant = null;
if (isset($child['class'])) {
$childClass = $child['class'];
$constant = $child['cast'];
} elseif (isset($child['constant'])) {
$childClass = FILE_ASN1_CLASS_CONTEXT_SPECIFIC;
$constant = $child['constant'];
}
if (isset($constant) && isset($temp['constant'])) {
// Can only match if constants and class match.
$maymatch = $constant == $temp['constant'] && $childClass == $tempClass;
} else {
// Can only match if no constant expected and type matches or is generic.
$maymatch = !isset($child['constant']) && array_search($child['type'], array($temp['type'], FILE_ASN1_TYPE_ANY, FILE_ASN1_TYPE_CHOICE)) !== false;
}
}
if ($maymatch) {
// Attempt submapping.
$candidate = $this->asn1map($temp, $child, $special);
$maymatch = $candidate !== null;
}
if (!$maymatch) {
break;
}
// Got the match: use it.
if (isset($special[$key])) {
$candidate = call_user_func($special[$key], $candidate);
}
$map[$key] = $candidate;
break;
}
}
foreach ($mapping['children'] as $key => $child) {
if (!isset($map[$key])) {
if (isset($child['default'])) {
$map[$key] = $child['default'];
} elseif (!isset($child['optional'])) {
return null;
}
}
}
return $map;
case FILE_ASN1_TYPE_OBJECT_IDENTIFIER:
return isset($this->oids[$decoded['content']]) ? $this->oids[$decoded['content']] : $decoded['content'];
case FILE_ASN1_TYPE_UTC_TIME:
case FILE_ASN1_TYPE_GENERALIZED_TIME:
if (class_exists('DateTime')) {
if (isset($mapping['implicit'])) {
$decoded['content'] = $this->_decodeDateTime($decoded['content'], $decoded['type']);
}
if (!$decoded['content']) {
return false;
}
return $decoded['content']->format($this->format);
} else {
if (isset($mapping['implicit'])) {
$decoded['content'] = $this->_decodeUnixTime($decoded['content'], $decoded['type']);
}
return @date($this->format, $decoded['content']);
}
case FILE_ASN1_TYPE_BIT_STRING:
if (isset($mapping['mapping'])) {
$offset = ord($decoded['content'][0]);
$size = (strlen($decoded['content']) - 1) * 8 - $offset;
/*
From X.680-0207.pdf#page=46 (21.7):
"When a "NamedBitList" is used in defining a bitstring type ASN.1 encoding rules are free to add (or remove)
arbitrarily any trailing 0 bits to (or from) values that are being encoded or decoded. Application designers should
therefore ensure that different semantics are not associated with such values which differ only in the number of trailing
0 bits."
*/
$bits = count($mapping['mapping']) == $size ? array() : array_fill(0, count($mapping['mapping']) - $size, false);
for ($i = strlen($decoded['content']) - 1; $i > 0; $i--) {
$current = ord($decoded['content'][$i]);
for ($j = $offset; $j < 8; $j++) {
$bits[] = (bool) ($current & (1 << $j));
}
$offset = 0;
}
$values = array();
$map = array_reverse($mapping['mapping']);
foreach ($map as $i => $value) {
if ($bits[$i]) {
$values[] = $value;
}
}
return $values;
}
case FILE_ASN1_TYPE_OCTET_STRING:
return base64_encode($decoded['content']);
case FILE_ASN1_TYPE_NULL:
return '';
case FILE_ASN1_TYPE_BOOLEAN:
return $decoded['content'];
case FILE_ASN1_TYPE_NUMERIC_STRING:
case FILE_ASN1_TYPE_PRINTABLE_STRING:
case FILE_ASN1_TYPE_TELETEX_STRING:
case FILE_ASN1_TYPE_VIDEOTEX_STRING:
case FILE_ASN1_TYPE_IA5_STRING:
case FILE_ASN1_TYPE_GRAPHIC_STRING:
case FILE_ASN1_TYPE_VISIBLE_STRING:
case FILE_ASN1_TYPE_GENERAL_STRING:
case FILE_ASN1_TYPE_UNIVERSAL_STRING:
case FILE_ASN1_TYPE_UTF8_STRING:
case FILE_ASN1_TYPE_BMP_STRING:
return $decoded['content'];
case FILE_ASN1_TYPE_INTEGER:
case FILE_ASN1_TYPE_ENUMERATED:
$temp = $decoded['content'];
if (isset($mapping['implicit'])) {
$temp = new Math_BigInteger($decoded['content'], -256);
}
if (isset($mapping['mapping'])) {
$temp = (int) $temp->toString();
return isset($mapping['mapping'][$temp]) ?
$mapping['mapping'][$temp] :
false;
}
return $temp;
}
}
/**
* ASN.1 Encode
*
* DER-encodes an ASN.1 semantic mapping ($mapping). Some libraries would probably call this function
* an ASN.1 compiler.
*
* "Special" mappings can be applied via $special.
*
* @param string $source
* @param string $mapping
* @param int $idx
* @return string
* @access public
*/
function encodeDER($source, $mapping, $special = array())
{
$this->location = array();
return $this->_encode_der($source, $mapping, null, $special);
}
/**
* ASN.1 Encode (Helper function)
*
* @param string $source
* @param string $mapping
* @param int $idx
* @return string
* @access private
*/
function _encode_der($source, $mapping, $idx = null, $special = array())
{
if (is_object($source) && strtolower(get_class($source)) == 'file_asn1_element') {
return $source->element;
}
// do not encode (implicitly optional) fields with value set to default
if (isset($mapping['default']) && $source === $mapping['default']) {
return '';
}
if (isset($idx)) {
if (isset($special[$idx])) {
$source = call_user_func($special[$idx], $source);
}
$this->location[] = $idx;
}
$tag = $mapping['type'];
switch ($tag) {
case FILE_ASN1_TYPE_SET: // Children order is not important, thus process in sequence.
case FILE_ASN1_TYPE_SEQUENCE:
$tag|= 0x20; // set the constructed bit
// ignore the min and max
if (isset($mapping['min']) && isset($mapping['max'])) {
$value = array();
$child = $mapping['children'];
foreach ($source as $content) {
$temp = $this->_encode_der($content, $child, null, $special);
if ($temp === false) {
return false;
}
$value[]= $temp;
}
/* "The encodings of the component values of a set-of value shall appear in ascending order, the encodings being compared
as octet strings with the shorter components being padded at their trailing end with 0-octets.
NOTE - The padding octets are for comparison purposes only and do not appear in the encodings."
-- sec 11.6 of http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf */
if ($mapping['type'] == FILE_ASN1_TYPE_SET) {
sort($value);
}
$value = implode($value, '');
break;
}
$value = '';
foreach ($mapping['children'] as $key => $child) {
if (!array_key_exists($key, $source)) {
if (!isset($child['optional'])) {
return false;
}
continue;
}
$temp = $this->_encode_der($source[$key], $child, $key, $special);
if ($temp === false) {
return false;
}
// An empty child encoding means it has been optimized out.
// Else we should have at least one tag byte.
if ($temp === '') {
continue;
}
// if isset($child['constant']) is true then isset($child['optional']) should be true as well
if (isset($child['constant'])) {
/*
From X.680-0207.pdf#page=58 (30.6):
"The tagging construction specifies explicit tagging if any of the following holds:
...
c) the "Tag Type" alternative is used and the value of "TagDefault" for the module is IMPLICIT TAGS or
AUTOMATIC TAGS, but the type defined by "Type" is an untagged choice type, an untagged open type, or
an untagged "DummyReference" (see ITU-T Rec. X.683 | ISO/IEC 8824-4, 8.3)."
*/
if (isset($child['explicit']) || $child['type'] == FILE_ASN1_TYPE_CHOICE) {
$subtag = chr((FILE_ASN1_CLASS_CONTEXT_SPECIFIC << 6) | 0x20 | $child['constant']);
$temp = $subtag . $this->_encodeLength(strlen($temp)) . $temp;
} else {
$subtag = chr((FILE_ASN1_CLASS_CONTEXT_SPECIFIC << 6) | (ord($temp[0]) & 0x20) | $child['constant']);
$temp = $subtag . substr($temp, 1);
}
}
$value.= $temp;
}
break;
case FILE_ASN1_TYPE_CHOICE:
$temp = false;
foreach ($mapping['children'] as $key => $child) {
if (!isset($source[$key])) {
continue;
}
$temp = $this->_encode_der($source[$key], $child, $key, $special);
if ($temp === false) {
return false;
}
// An empty child encoding means it has been optimized out.
// Else we should have at least one tag byte.
if ($temp === '') {
continue;
}
$tag = ord($temp[0]);
// if isset($child['constant']) is true then isset($child['optional']) should be true as well
if (isset($child['constant'])) {
if (isset($child['explicit']) || $child['type'] == FILE_ASN1_TYPE_CHOICE) {
$subtag = chr((FILE_ASN1_CLASS_CONTEXT_SPECIFIC << 6) | 0x20 | $child['constant']);
$temp = $subtag . $this->_encodeLength(strlen($temp)) . $temp;
} else {
$subtag = chr((FILE_ASN1_CLASS_CONTEXT_SPECIFIC << 6) | (ord($temp[0]) & 0x20) | $child['constant']);
$temp = $subtag . substr($temp, 1);
}
}
}
if (isset($idx)) {
array_pop($this->location);
}
if ($temp && isset($mapping['cast'])) {
$temp[0] = chr(($mapping['class'] << 6) | ($tag & 0x20) | $mapping['cast']);
}
return $temp;
case FILE_ASN1_TYPE_INTEGER:
case FILE_ASN1_TYPE_ENUMERATED:
if (!isset($mapping['mapping'])) {
if (is_numeric($source)) {
$source = new Math_BigInteger($source);
}
$value = $source->toBytes(true);
} else {
$value = array_search($source, $mapping['mapping']);
if ($value === false) {
return false;
}
$value = new Math_BigInteger($value);
$value = $value->toBytes(true);
}
if (!strlen($value)) {
$value = chr(0);
}
break;
case FILE_ASN1_TYPE_UTC_TIME:
case FILE_ASN1_TYPE_GENERALIZED_TIME:
$format = $mapping['type'] == FILE_ASN1_TYPE_UTC_TIME ? 'y' : 'Y';
$format.= 'mdHis';
if (!class_exists('DateTime')) {
$value = @gmdate($format, strtotime($source)) . 'Z';
} else {
$date = new DateTime($source, new DateTimeZone('GMT'));
$value = $date->format($format) . 'Z';
}
break;
case FILE_ASN1_TYPE_BIT_STRING:
if (isset($mapping['mapping'])) {
$bits = array_fill(0, count($mapping['mapping']), 0);
$size = 0;
for ($i = 0; $i < count($mapping['mapping']); $i++) {
if (in_array($mapping['mapping'][$i], $source)) {
$bits[$i] = 1;
$size = $i;
}
}
if (isset($mapping['min']) && $mapping['min'] >= 1 && $size < $mapping['min']) {
$size = $mapping['min'] - 1;
}
$offset = 8 - (($size + 1) & 7);
$offset = $offset !== 8 ? $offset : 0;
$value = chr($offset);
for ($i = $size + 1; $i < count($mapping['mapping']); $i++) {
unset($bits[$i]);
}
$bits = implode('', array_pad($bits, $size + $offset + 1, 0));
$bytes = explode(' ', rtrim(chunk_split($bits, 8, ' ')));
foreach ($bytes as $byte) {
$value.= chr(bindec($byte));
}
break;
}
case FILE_ASN1_TYPE_OCTET_STRING:
/* The initial octet shall encode, as an unsigned binary integer with bit 1 as the least significant bit,
the number of unused bits in the final subsequent octet. The number shall be in the range zero to seven.
-- http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf#page=16 */
$value = base64_decode($source);
break;
case FILE_ASN1_TYPE_OBJECT_IDENTIFIER:
$oid = preg_match('#(?:\d+\.)+#', $source) ? $source : array_search($source, $this->oids);
if ($oid === false) {
user_error('Invalid OID');
return false;
}
$value = '';
$parts = explode('.', $oid);
$value = chr(40 * $parts[0] + $parts[1]);
for ($i = 2; $i < count($parts); $i++) {
$temp = '';
if (!$parts[$i]) {
$temp = "\0";
} else {
while ($parts[$i]) {
$temp = chr(0x80 | ($parts[$i] & 0x7F)) . $temp;
$parts[$i] >>= 7;
}
$temp[strlen($temp) - 1] = $temp[strlen($temp) - 1] & chr(0x7F);
}
$value.= $temp;
}
break;
case FILE_ASN1_TYPE_ANY:
$loc = $this->location;
if (isset($idx)) {
array_pop($this->location);
}
switch (true) {
case !isset($source):
return $this->_encode_der(null, array('type' => FILE_ASN1_TYPE_NULL) + $mapping, null, $special);
case is_int($source):
case is_object($source) && strtolower(get_class($source)) == 'math_biginteger':
return $this->_encode_der($source, array('type' => FILE_ASN1_TYPE_INTEGER) + $mapping, null, $special);
case is_float($source):
return $this->_encode_der($source, array('type' => FILE_ASN1_TYPE_REAL) + $mapping, null, $special);
case is_bool($source):
return $this->_encode_der($source, array('type' => FILE_ASN1_TYPE_BOOLEAN) + $mapping, null, $special);
case is_array($source) && count($source) == 1:
$typename = implode('', array_keys($source));
$outtype = array_search($typename, $this->ANYmap, true);
if ($outtype !== false) {
return $this->_encode_der($source[$typename], array('type' => $outtype) + $mapping, null, $special);
}
}
$filters = $this->filters;
foreach ($loc as $part) {
if (!isset($filters[$part])) {
$filters = false;
break;
}
$filters = $filters[$part];
}
if ($filters === false) {
user_error('No filters defined for ' . implode('/', $loc));
return false;
}
return $this->_encode_der($source, $filters + $mapping, null, $special);
case FILE_ASN1_TYPE_NULL:
$value = '';
break;
case FILE_ASN1_TYPE_NUMERIC_STRING:
case FILE_ASN1_TYPE_TELETEX_STRING:
case FILE_ASN1_TYPE_PRINTABLE_STRING:
case FILE_ASN1_TYPE_UNIVERSAL_STRING:
case FILE_ASN1_TYPE_UTF8_STRING:
case FILE_ASN1_TYPE_BMP_STRING:
case FILE_ASN1_TYPE_IA5_STRING:
case FILE_ASN1_TYPE_VISIBLE_STRING:
case FILE_ASN1_TYPE_VIDEOTEX_STRING:
case FILE_ASN1_TYPE_GRAPHIC_STRING:
case FILE_ASN1_TYPE_GENERAL_STRING:
$value = $source;
break;
case FILE_ASN1_TYPE_BOOLEAN:
$value = $source ? "\xFF" : "\x00";
break;
default:
user_error('Mapping provides no type definition for ' . implode('/', $this->location));
return false;
}
if (isset($idx)) {
array_pop($this->location);
}
if (isset($mapping['cast'])) {
if (isset($mapping['explicit']) || $mapping['type'] == FILE_ASN1_TYPE_CHOICE) {
$value = chr($tag) . $this->_encodeLength(strlen($value)) . $value;
$tag = ($mapping['class'] << 6) | 0x20 | $mapping['cast'];
} else {
$tag = ($mapping['class'] << 6) | (ord($temp[0]) & 0x20) | $mapping['cast'];
}
}
return chr($tag) . $this->_encodeLength(strlen($value)) . $value;
}
/**
* DER-encode the length
*
* DER supports lengths up to (2**8)**127, however, we'll only support lengths up to (2**8)**4. See
* {@link http://itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf#p=13 X.690 paragraph 8.1.3} for more information.
*
* @access private
* @param int $length
* @return string
*/
function _encodeLength($length)
{
if ($length <= 0x7F) {
return chr($length);
}
$temp = ltrim(pack('N', $length), chr(0));
return pack('Ca*', 0x80 | strlen($temp), $temp);
}
/**
* BER-decode the time (using UNIX time)
*
* Called by _decode_ber() and in the case of implicit tags asn1map().
*
* @access private
* @param string $content
* @param int $tag
* @return string
*/
function _decodeUnixTime($content, $tag)
{
/* UTCTime:
http://tools.ietf.org/html/rfc5280#section-4.1.2.5.1
http://www.obj-sys.com/asn1tutorial/node15.html
GeneralizedTime:
http://tools.ietf.org/html/rfc5280#section-4.1.2.5.2
http://www.obj-sys.com/asn1tutorial/node14.html */
$pattern = $tag == FILE_ASN1_TYPE_UTC_TIME ?
'#^(..)(..)(..)(..)(..)(..)?(.*)$#' :
'#(....)(..)(..)(..)(..)(..).*([Z+-].*)$#';
preg_match($pattern, $content, $matches);
list(, $year, $month, $day, $hour, $minute, $second, $timezone) = $matches;
if ($tag == FILE_ASN1_TYPE_UTC_TIME) {
$year = $year >= 50 ? "19$year" : "20$year";
}
if ($timezone == 'Z') {
$mktime = 'gmmktime';
$timezone = 0;
} elseif (preg_match('#([+-])(\d\d)(\d\d)#', $timezone, $matches)) {
$mktime = 'gmmktime';
$timezone = 60 * $matches[3] + 3600 * $matches[2];
if ($matches[1] == '-') {
$timezone = -$timezone;
}
} else {
$mktime = 'mktime';
$timezone = 0;
}
return @$mktime((int)$hour, (int)$minute, (int)$second, (int)$month, (int)$day, (int)$year) + $timezone;
}
/**
* BER-decode the time (using DateTime)
*
* Called by _decode_ber() and in the case of implicit tags asn1map().
*
* @access private
* @param string $content
* @param int $tag
* @return string
*/
function _decodeDateTime($content, $tag)
{
/* UTCTime:
http://tools.ietf.org/html/rfc5280#section-4.1.2.5.1
http://www.obj-sys.com/asn1tutorial/node15.html
GeneralizedTime:
http://tools.ietf.org/html/rfc5280#section-4.1.2.5.2
http://www.obj-sys.com/asn1tutorial/node14.html */
$format = 'YmdHis';
if ($tag == FILE_ASN1_TYPE_UTC_TIME) {
// https://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf#page=28 says "the seconds
// element shall always be present" but none-the-less I've seen X509 certs where it isn't and if the
// browsers parse it phpseclib ought to too
if (preg_match('#^(\d{10})(Z|[+-]\d{4})$#', $content, $matches)) {
$content = $matches[1] . '00' . $matches[2];
}
$prefix = substr($content, 0, 2) >= 50 ? '19' : '20';
$content = $prefix . $content;
} elseif (strpos($content, '.') !== false) {
$format.= '.u';
}
if ($content[strlen($content) - 1] == 'Z') {
$content = substr($content, 0, -1) . '+0000';
}
if (strpos($content, '-') !== false || strpos($content, '+') !== false) {
$format.= 'O';
}
// error supression isn't necessary as of PHP 7.0:
// http://php.net/manual/en/migration70.other-changes.php
return @DateTime::createFromFormat($format, $content);
}
/**
* Set the time format
*
* Sets the time / date format for asn1map().
*
* @access public
* @param string $format
*/
function setTimeFormat($format)
{
$this->format = $format;
}
/**
* Load OIDs
*
* Load the relevant OIDs for a particular ASN.1 semantic mapping.
*
* @access public
* @param array $oids
*/
function loadOIDs($oids)
{
$this->oids = $oids;
}
/**
* Load filters
*
* See File_X509, etc, for an example.
*
* @access public
* @param array $filters
*/
function loadFilters($filters)
{
$this->filters = $filters;
}
/**
* String Shift
*
* Inspired by array_shift
*
* @param string $string
* @param int $index
* @return string
* @access private
*/
function _string_shift(&$string, $index = 1)
{
$substr = substr($string, 0, $index);
$string = substr($string, $index);
return $substr;
}
/**
* String type conversion
*
* This is a lazy conversion, dealing only with character size.
* No real conversion table is used.
*
* @param string $in
* @param int $from
* @param int $to
* @return string
* @access public
*/
function convert($in, $from = FILE_ASN1_TYPE_UTF8_STRING, $to = FILE_ASN1_TYPE_UTF8_STRING)
{
if (!isset($this->stringTypeSize[$from]) || !isset($this->stringTypeSize[$to])) {
return false;
}
$insize = $this->stringTypeSize[$from];
$outsize = $this->stringTypeSize[$to];
$inlength = strlen($in);
$out = '';
for ($i = 0; $i < $inlength;) {
if ($inlength - $i < $insize) {
return false;
}
// Get an input character as a 32-bit value.
$c = ord($in[$i++]);
switch (true) {
case $insize == 4:
$c = ($c << 8) | ord($in[$i++]);
$c = ($c << 8) | ord($in[$i++]);
case $insize == 2:
$c = ($c << 8) | ord($in[$i++]);
case $insize == 1:
break;
case ($c & 0x80) == 0x00:
break;
case ($c & 0x40) == 0x00:
return false;
default:
$bit = 6;
do {
if ($bit > 25 || $i >= $inlength || (ord($in[$i]) & 0xC0) != 0x80) {
return false;
}
$c = ($c << 6) | (ord($in[$i++]) & 0x3F);
$bit += 5;
$mask = 1 << $bit;
} while ($c & $bit);
$c &= $mask - 1;
break;
}
// Convert and append the character to output string.
$v = '';
switch (true) {
case $outsize == 4:
$v .= chr($c & 0xFF);
$c >>= 8;
$v .= chr($c & 0xFF);
$c >>= 8;
case $outsize == 2:
$v .= chr($c & 0xFF);
$c >>= 8;
case $outsize == 1:
$v .= chr($c & 0xFF);
$c >>= 8;
if ($c) {
return false;
}
break;
case ($c & 0x80000000) != 0:
return false;
case $c >= 0x04000000:
$v .= chr(0x80 | ($c & 0x3F));
$c = ($c >> 6) | 0x04000000;
case $c >= 0x00200000:
$v .= chr(0x80 | ($c & 0x3F));
$c = ($c >> 6) | 0x00200000;
case $c >= 0x00010000:
$v .= chr(0x80 | ($c & 0x3F));
$c = ($c >> 6) | 0x00010000;
case $c >= 0x00000800:
$v .= chr(0x80 | ($c & 0x3F));
$c = ($c >> 6) | 0x00000800;
case $c >= 0x00000080:
$v .= chr(0x80 | ($c & 0x3F));
$c = ($c >> 6) | 0x000000C0;
default:
$v .= chr($c);
break;
}
$out .= strrev($v);
}
return $out;
}
}
|