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280 lines
9.1 KiB
JavaScript
280 lines
9.1 KiB
JavaScript
/*! asn1hex-1.1.js (c) 2012 Kenji Urushima | kjur.github.com/jsrsasign/license
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*/
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//
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// asn1hex.js - Hexadecimal represented ASN.1 string library
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//
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// version: 1.1 (09-May-2012)
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//
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// Copyright (c) 2010-2012 Kenji Urushima (kenji.urushima@gmail.com)
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//
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// This software is licensed under the terms of the MIT License.
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// http://kjur.github.com/jsrsasign/license/
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//
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// The above copyright and license notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// Depends on:
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//
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// MEMO:
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// f('3082025b02...', 2) ... 82025b ... 3bytes
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// f('020100', 2) ... 01 ... 1byte
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// f('0203001...', 2) ... 03 ... 1byte
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// f('02818003...', 2) ... 8180 ... 2bytes
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// f('3080....0000', 2) ... 80 ... -1
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//
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// Requirements:
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// - ASN.1 type octet length MUST be 1.
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// (i.e. ASN.1 primitives like SET, SEQUENCE, INTEGER, OCTETSTRING ...)
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// -
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/**
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* get byte length for ASN.1 L(length) bytes
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* @name getByteLengthOfL_AtObj
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* @memberOf ASN1HEX
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* @function
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* @param {String} s hexadecimal string of ASN.1 DER encoded data
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* @param {Number} pos string index
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* @return byte length for ASN.1 L(length) bytes
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*/
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function _asnhex_getByteLengthOfL_AtObj(s, pos) {
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if (s.substring(pos + 2, pos + 3) != '8') return 1;
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var i = parseInt(s.substring(pos + 3, pos + 4));
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if (i == 0) return -1; // length octet '80' indefinite length
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if (0 < i && i < 10) return i + 1; // including '8?' octet;
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return -2; // malformed format
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}
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/**
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* get hexadecimal string for ASN.1 L(length) bytes
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* @name getHexOfL_AtObj
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* @memberOf ASN1HEX
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* @function
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* @param {String} s hexadecimal string of ASN.1 DER encoded data
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* @param {Number} pos string index
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* @return {String} hexadecimal string for ASN.1 L(length) bytes
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*/
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function _asnhex_getHexOfL_AtObj(s, pos) {
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var len = _asnhex_getByteLengthOfL_AtObj(s, pos);
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if (len < 1) return '';
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return s.substring(pos + 2, pos + 2 + len * 2);
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}
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//
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// getting ASN.1 length value at the position 'idx' of
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// hexa decimal string 's'.
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//
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// f('3082025b02...', 0) ... 82025b ... ???
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// f('020100', 0) ... 01 ... 1
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// f('0203001...', 0) ... 03 ... 3
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// f('02818003...', 0) ... 8180 ... 128
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/**
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* get integer value of ASN.1 length for ASN.1 data
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* @name getIntOfL_AtObj
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* @memberOf ASN1HEX
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* @function
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* @param {String} s hexadecimal string of ASN.1 DER encoded data
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* @param {Number} pos string index
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* @return ASN.1 L(length) integer value
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*/
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function _asnhex_getIntOfL_AtObj(s, pos) {
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var hLength = _asnhex_getHexOfL_AtObj(s, pos);
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if (hLength == '') return -1;
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var bi;
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if (parseInt(hLength.substring(0, 1)) < 8) {
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bi = parseBigInt(hLength, 16);
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} else {
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bi = parseBigInt(hLength.substring(2), 16);
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}
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return bi.intValue();
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}
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/**
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* get ASN.1 value starting string position for ASN.1 object refered by index 'idx'.
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* @name getStartPosOfV_AtObj
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* @memberOf ASN1HEX
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* @function
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* @param {String} s hexadecimal string of ASN.1 DER encoded data
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* @param {Number} pos string index
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*/
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function _asnhex_getStartPosOfV_AtObj(s, pos) {
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var l_len = _asnhex_getByteLengthOfL_AtObj(s, pos);
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if (l_len < 0) return l_len;
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return pos + (l_len + 1) * 2;
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}
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/**
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* get hexadecimal string of ASN.1 V(value)
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* @name getHexOfV_AtObj
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* @memberOf ASN1HEX
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* @function
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* @param {String} s hexadecimal string of ASN.1 DER encoded data
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* @param {Number} pos string index
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* @return {String} hexadecimal string of ASN.1 value.
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*/
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function _asnhex_getHexOfV_AtObj(s, pos) {
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var pos1 = _asnhex_getStartPosOfV_AtObj(s, pos);
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var len = _asnhex_getIntOfL_AtObj(s, pos);
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return s.substring(pos1, pos1 + len * 2);
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}
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/**
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* get hexadecimal string of ASN.1 TLV at
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* @name getHexOfTLV_AtObj
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* @memberOf ASN1HEX
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* @function
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* @param {String} s hexadecimal string of ASN.1 DER encoded data
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* @param {Number} pos string index
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* @return {String} hexadecimal string of ASN.1 TLV.
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* @since 1.1
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*/
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function _asnhex_getHexOfTLV_AtObj(s, pos) {
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var hT = s.substr(pos, 2);
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var hL = _asnhex_getHexOfL_AtObj(s, pos);
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var hV = _asnhex_getHexOfV_AtObj(s, pos);
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return hT + hL + hV;
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}
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/**
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* get next sibling starting index for ASN.1 object string
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* @name getPosOfNextSibling_AtObj
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* @memberOf ASN1HEX
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* @function
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* @param {String} s hexadecimal string of ASN.1 DER encoded data
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* @param {Number} pos string index
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* @return next sibling starting index for ASN.1 object string
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*/
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function _asnhex_getPosOfNextSibling_AtObj(s, pos) {
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var pos1 = _asnhex_getStartPosOfV_AtObj(s, pos);
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var len = _asnhex_getIntOfL_AtObj(s, pos);
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return pos1 + len * 2;
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}
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/**
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* get array of indexes of child ASN.1 objects
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* @name getPosArrayOfChildren_AtObj
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* @memberOf ASN1HEX
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* @function
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* @param {String} s hexadecimal string of ASN.1 DER encoded data
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* @param {Number} start string index of ASN.1 object
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* @return {Array of Number} array of indexes for childen of ASN.1 objects
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*/
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function _asnhex_getPosArrayOfChildren_AtObj(h, pos) {
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var a = new Array();
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var p0 = _asnhex_getStartPosOfV_AtObj(h, pos);
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a.push(p0);
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var len = _asnhex_getIntOfL_AtObj(h, pos);
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var p = p0;
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var k = 0;
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while (1) {
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var pNext = _asnhex_getPosOfNextSibling_AtObj(h, p);
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if (pNext == null || (pNext - p0 >= (len * 2))) break;
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if (k >= 200) break;
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a.push(pNext);
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p = pNext;
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k++;
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}
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return a;
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}
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/**
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* get string index of nth child object of ASN.1 object refered by h, idx
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* @name getNthChildIndex_AtObj
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* @memberOf ASN1HEX
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* @function
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* @param {String} h hexadecimal string of ASN.1 DER encoded data
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* @param {Number} idx start string index of ASN.1 object
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* @param {Number} nth for child
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* @return {Number} string index of nth child.
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* @since 1.1
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*/
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function _asnhex_getNthChildIndex_AtObj(h, idx, nth) {
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var a = _asnhex_getPosArrayOfChildren_AtObj(h, idx);
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return a[nth];
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}
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// ========== decendant methods ==============================
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/**
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* get string index of nth child object of ASN.1 object refered by h, idx
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* @name getDecendantIndexByNthList
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* @memberOf ASN1HEX
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* @function
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* @param {String} h hexadecimal string of ASN.1 DER encoded data
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* @param {Number} currentIndex start string index of ASN.1 object
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* @param {Array of Number} nthList array list of nth
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* @return {Number} string index refered by nthList
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* @since 1.1
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*/
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function _asnhex_getDecendantIndexByNthList(h, currentIndex, nthList) {
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if (nthList.length == 0) {
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return currentIndex;
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}
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var firstNth = nthList.shift();
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var a = _asnhex_getPosArrayOfChildren_AtObj(h, currentIndex);
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return _asnhex_getDecendantIndexByNthList(h, a[firstNth], nthList);
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}
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/**
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* get hexadecimal string of ASN.1 TLV refered by current index and nth index list.
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* @name getDecendantHexTLVByNthList
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* @memberOf ASN1HEX
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* @function
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* @param {String} h hexadecimal string of ASN.1 DER encoded data
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* @param {Number} currentIndex start string index of ASN.1 object
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* @param {Array of Number} nthList array list of nth
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* @return {Number} hexadecimal string of ASN.1 TLV refered by nthList
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* @since 1.1
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*/
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function _asnhex_getDecendantHexTLVByNthList(h, currentIndex, nthList) {
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var idx = _asnhex_getDecendantIndexByNthList(h, currentIndex, nthList);
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return _asnhex_getHexOfTLV_AtObj(h, idx);
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}
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/**
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* get hexadecimal string of ASN.1 V refered by current index and nth index list.
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* @name getDecendantHexVByNthList
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* @memberOf ASN1HEX
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* @function
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* @param {String} h hexadecimal string of ASN.1 DER encoded data
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* @param {Number} currentIndex start string index of ASN.1 object
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* @param {Array of Number} nthList array list of nth
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* @return {Number} hexadecimal string of ASN.1 V refered by nthList
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* @since 1.1
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*/
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function _asnhex_getDecendantHexVByNthList(h, currentIndex, nthList) {
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var idx = _asnhex_getDecendantIndexByNthList(h, currentIndex, nthList);
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return _asnhex_getHexOfV_AtObj(h, idx);
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}
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// ========== class definition ==============================
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/**
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* ASN.1 DER encoded hexadecimal string utility class
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* @class ASN.1 DER encoded hexadecimal string utility class
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* @author Kenji Urushima
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* @version 1.1 (09 May 2012)
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* @see <a href="http://kjur.github.com/jsrsasigns/">'jwrsasign'(RSA Sign JavaScript Library) home page http://kjur.github.com/jsrsasign/</a>
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* @since 1.1
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*/
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function ASN1HEX() {
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return ASN1HEX;
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}
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ASN1HEX.getByteLengthOfL_AtObj = _asnhex_getByteLengthOfL_AtObj;
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ASN1HEX.getHexOfL_AtObj = _asnhex_getHexOfL_AtObj;
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ASN1HEX.getIntOfL_AtObj = _asnhex_getIntOfL_AtObj;
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ASN1HEX.getStartPosOfV_AtObj = _asnhex_getStartPosOfV_AtObj;
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ASN1HEX.getHexOfV_AtObj = _asnhex_getHexOfV_AtObj;
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ASN1HEX.getHexOfTLV_AtObj = _asnhex_getHexOfTLV_AtObj;
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ASN1HEX.getPosOfNextSibling_AtObj = _asnhex_getPosOfNextSibling_AtObj;
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ASN1HEX.getPosArrayOfChildren_AtObj = _asnhex_getPosArrayOfChildren_AtObj;
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ASN1HEX.getNthChildIndex_AtObj = _asnhex_getNthChildIndex_AtObj;
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ASN1HEX.getDecendantIndexByNthList = _asnhex_getDecendantIndexByNthList;
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ASN1HEX.getDecendantHexVByNthList = _asnhex_getDecendantHexVByNthList;
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ASN1HEX.getDecendantHexTLVByNthList = _asnhex_getDecendantHexTLVByNthList;
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