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//
// asn1hex.js - Hexadecimal represented ASN.1 string library
//
//
// version: 1.0 (2010-Jun-03)
//
// Copyright (c) 2010 Kenji Urushima (kenji.urushima@gmail.com)
//
// This software is licensed under the terms of the MIT License.
// http://www.opensource.org/licenses/mit-license.php
//
// The above copyright and license notice shall be
// included in all copies or substantial portions of the Software.
//
//
// Depends on:
//
// MEMO:
// f('3082025b02...', 2) ... 82025b ... 3bytes
// f('020100', 2) ... 01 ... 1byte
// f('0203001...', 2) ... 03 ... 1byte
// f('02818003...', 2) ... 8180 ... 2bytes
// f('3080....0000', 2) ... 80 ... -1
//
// Requirements:
// - ASN.1 type octet length MUST be 1.
// (i.e. ASN.1 primitives like SET, SEQUENCE, INTEGER, OCTETSTRING ...)
// -
function _asnhex_getByteLengthOfL_AtObj(s, pos) {
if (s.substring(pos + 2, pos + 3) != '8') return 1;
var i = parseInt(s.substring(pos + 3, pos + 4));
if (i == 0) return -1; // length octet '80' indefinite length
if (0 < i && i < 10) return i + 1; // including '8?' octet;
return -2; // malformed format
}
function _asnhex_getHexOfL_AtObj(s, pos) {
var len = _asnhex_getByteLengthOfL_AtObj(s, pos);
if (len < 1) return '';
return s.substring(pos + 2, pos + 2 + len * 2);
}
//
// getting ASN.1 length value at the position 'idx' of
// hexa decimal string 's'.
//
// f('3082025b02...', 0) ... 82025b ... ???
// f('020100', 0) ... 01 ... 1
// f('0203001...', 0) ... 03 ... 3
// f('02818003...', 0) ... 8180 ... 128
function _asnhex_getIntOfL_AtObj(s, pos) {
var hLength = _asnhex_getHexOfL_AtObj(s, pos);
if (hLength == '') return -1;
var bi;
if (parseInt(hLength.substring(0, 1)) < 8) {
bi = parseBigInt(hLength, 16);
} else {
bi = parseBigInt(hLength.substring(2), 16);
}
return bi.intValue();
}
//
// get ASN.1 value starting string position
// for ASN.1 object refered by index 'idx'.
//
function _asnhex_getStartPosOfV_AtObj(s, pos) {
var l_len = _asnhex_getByteLengthOfL_AtObj(s, pos);
if (l_len < 0) return l_len;
return pos + (l_len + 1) * 2;
}
function _asnhex_getHexOfV_AtObj(s, pos) {
var pos1 = _asnhex_getStartPosOfV_AtObj(s, pos);
var len = _asnhex_getIntOfL_AtObj(s, pos);
return s.substring(pos1, pos1 + len * 2);
}
function _asnhex_getPosOfNextSibling_AtObj(s, pos) {
var pos1 = _asnhex_getStartPosOfV_AtObj(s, pos);
var len = _asnhex_getIntOfL_AtObj(s, pos);
return pos1 + len * 2;
}
function _asnhex_getPosArrayOfChildren_AtObj(h, pos) {
var a = new Array();
var p0 = _asnhex_getStartPosOfV_AtObj(h, pos);
a.push(p0);
var len = _asnhex_getIntOfL_AtObj(h, pos);
var p = p0;
var k = 0;
while (1) {
var pNext = _asnhex_getPosOfNextSibling_AtObj(h, p);
if (pNext == null || (pNext - p0 >= (len * 2))) break;
if (k >= 200) break;
a.push(pNext);
p = pNext;
k++;
}
return a;
}
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