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/**
* ObjectIdentifier
*
* An ASN1 type for an ObjectIdentifier
* We store the oid in an Array.
* Copyright (c) 2007 Henri Torgemane
*
* See LICENSE.txt for full license information.
*/
package com.hurlant.util.der
{
import flash.utils.ByteArray;
public class ObjectIdentifier implements IAsn1Type
{
private var type:uint;
private var len:uint;
private var oid:Array;
public function ObjectIdentifier(type:uint, length:uint, b:*) {
this.type = type;
this.len = length;
if (b is ByteArray) {
parse(b as ByteArray);
} else if (b is String) {
generate(b as String);
} else {
throw new Error("Invalid call to new ObjectIdentifier");
}
}
private function generate(s:String):void {
oid = s.split(".");
}
private function parse(b:ByteArray):void {
// parse stuff
// first byte = 40*value1 + value2
var o:uint = b.readUnsignedByte();
var a:Array = []
a.push(uint(o/40));
a.push(uint(o%40));
var v:uint = 0;
while (b.bytesAvailable>0) {
o = b.readUnsignedByte();
var last:Boolean = (o&0x80)==0;
o &= 0x7f;
v = v*128 + o;
if (last) {
a.push(v);
v = 0;
}
}
oid = a;
}
public function getLength():uint
{
return len;
}
public function getType():uint
{
return type;
}
public function toDER():ByteArray {
var tmp:Array = [];
tmp[0] = oid[0]*40 + oid[1];
for (var i:int=2;i<oid.length;i++) {
var v:int = parseInt(oid[i]);
if (v<128) {
tmp.push(v);
} else if (v<128*128) {
tmp.push( (v>>7)|0x80 );
tmp.push( v&0x7f );
} else if (v<128*128*128) {
tmp.push( (v>>14)|0x80 );
tmp.push( (v>>7)&0x7f | 0x80 );
tmp.push( v&0x7f);
} else if (v<128*128*128*128) {
tmp.push( (v>>21)|0x80 );
tmp.push( (v>>14) & 0x7f | 0x80 );
tmp.push( (v>>7) & 0x7f | 0x80 );
tmp.push( v & 0x7f );
} else {
throw new Error("OID element bigger than we thought. :(");
}
}
len = tmp.length;
if (type==0) {
type = 6;
}
tmp.unshift(len); // assume length is small enough to fit here.
tmp.unshift(type);
var b:ByteArray = new ByteArray;
for (i=0;i<tmp.length;i++) {
b[i] = tmp[i];
}
return b;
}
public function toString():String {
return DER.indent+oid.join(".");
}
public function dump():String {
return "OID["+type+"]["+len+"]["+toString()+"]";
}
}
}
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