293 lines
9.4 KiB
JavaScript
293 lines
9.4 KiB
JavaScript
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/*! asn1hex-1.1.4.js (c) 2012-2013 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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* Copyright (c) 2010-2013 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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/**
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* @fileOverview
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* @name asn1hex-1.1.js
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* @author Kenji Urushima kenji.urushima@gmail.com
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* @version asn1hex 1.1.4 (2013-Oct-02)
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* @license <a href="http://kjur.github.io/jsrsasign/license/">MIT License</a>
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*/
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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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* ASN.1 DER encoded hexadecimal string utility class
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* @name ASN1HEX
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* @class ASN.1 DER encoded hexadecimal string utility class
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* @since jsrsasign 1.1
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*/
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var ASN1HEX = new function() {
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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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this.getByteLengthOfL_AtObj = function(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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this.getHexOfL_AtObj = function(s, pos) {
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var len = this.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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// 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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this.getIntOfL_AtObj = function(s, pos) {
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var hLength = this.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 = new BigInteger(hLength, 16);
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} else {
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bi = new BigInteger(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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this.getStartPosOfV_AtObj = function(s, pos) {
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var l_len = this.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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this.getHexOfV_AtObj = function(s, pos) {
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var pos1 = this.getStartPosOfV_AtObj(s, pos);
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var len = this.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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this.getHexOfTLV_AtObj = function(s, pos) {
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var hT = s.substr(pos, 2);
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var hL = this.getHexOfL_AtObj(s, pos);
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var hV = this.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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this.getPosOfNextSibling_AtObj = function(s, pos) {
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var pos1 = this.getStartPosOfV_AtObj(s, pos);
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var len = this.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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this.getPosArrayOfChildren_AtObj = function(h, pos) {
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var a = new Array();
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var p0 = this.getStartPosOfV_AtObj(h, pos);
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a.push(p0);
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var len = this.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 = this.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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this.getNthChildIndex_AtObj = function(h, idx, nth) {
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var a = this.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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* @example
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* The "nthList" is a index list of structured ASN.1 object
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* reference. Here is a sample structure and "nthList"s which
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* refers each objects.
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*
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* SQUENCE - [0]
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* SEQUENCE - [0, 0]
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* IA5STRING 000 - [0, 0, 0]
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* UTF8STRING 001 - [0, 0, 1]
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* SET - [0, 1]
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* IA5STRING 010 - [0, 1, 0]
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* UTF8STRING 011 - [0, 1, 1]
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*/
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this.getDecendantIndexByNthList = function(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 = this.getPosArrayOfChildren_AtObj(h, currentIndex);
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return this.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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this.getDecendantHexTLVByNthList = function(h, currentIndex, nthList) {
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var idx = this.getDecendantIndexByNthList(h, currentIndex, nthList);
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return this.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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this.getDecendantHexVByNthList = function(h, currentIndex, nthList) {
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var idx = this.getDecendantIndexByNthList(h, currentIndex, nthList);
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return this.getHexOfV_AtObj(h, idx);
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};
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};
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/*
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* @since asn1hex 1.1.4
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*/
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ASN1HEX.getVbyList = function(h, currentIndex, nthList, checkingTag) {
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var idx = this.getDecendantIndexByNthList(h, currentIndex, nthList);
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if (idx === undefined) {
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throw "can't find nthList object";
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}
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if (checkingTag !== undefined) {
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if (h.substr(idx, 2) != checkingTag) {
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throw "checking tag doesn't match: " + h.substr(idx,2) + "!=" + checkingTag;
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}
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}
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return this.getHexOfV_AtObj(h, idx);
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};
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