no commit message

2020-09-17 18:40:01 +08:00
parent 4382915d09
commit d957abceaa
283 changed files with 86935 additions and 63 deletions
@@ -0,0 +1,110 @@
+package com.hurlant.util.der
+{
+	import com.hurlant.math.BigInteger;
+	
+	import flash.utils.ByteArray;
+	import com.hurlant.util.der.Sequence;
+	
+	// goal 1: to be able to parse an RSA Private Key PEM file.
+	// goal 2: to parse an X509v3 cert. kinda.
+	
+	/**
+	 * DER for dummies:
+	 * http://luca.ntop.org/Teaching/Appunti/asn1.html
+	 * 
+	 * This class does the bare minimum to get by. if that.
+	 */
+	public class DER
+	{
+		public static var indent:String = "";
+		
+		public static function parse(der:ByteArray, structure:*=null):IAsn1Type {
+			// type
+			var type:int = der.readUnsignedByte();
+			var constructed:Boolean = (type&0x20)!=0;
+			type &=0x1F;
+			// length
+			var len:int = der.readUnsignedByte();
+			if (len>=0x80) {
+				// long form of length
+				var count:int = len & 0x7f;
+				len = 0;
+				while (count>0) {
+					len = (len<<8) | der.readUnsignedByte();
+					count--;
+				}
+			}
+			// data
+			var b:ByteArray
+			switch (type) {
+				case 0x00: // WHAT IS THIS THINGY? (seen as 0xa0)
+					// (note to self: read a spec someday.)
+					// for now, treat as a sequence.
+				case 0x10: // SEQUENCE/SEQUENCE OF. whatever
+					// treat as an array
+					var p:int = der.position;
+					var o:Sequence = new Sequence(type, len);
+					var arrayStruct:Array = structure as Array;
+					while (der.position < p+len) {
+						var tmpStruct:Object = null
+						if (arrayStruct!=null) {
+							tmpStruct = arrayStruct.shift();
+						}
+						if (tmpStruct!=null) {
+							var name:String = tmpStruct.name;
+							var value:* = tmpStruct.value;
+							var obj:IAsn1Type = DER.parse(der, value);
+							o.push(obj);
+							o[name] = obj;
+						} else {
+							o.push(DER.parse(der));
+						}
+					}
+					return o;
+				case 0x11: // SET/SET OF
+					p = der.position;
+					var s:Set = new Set(type, len);
+					while (der.position < p+len) {
+						s.push(DER.parse(der));
+					}
+					return s;
+				case 0x02: // INTEGER
+					// put in a BigInteger
+					b = new ByteArray;
+					der.readBytes(b,0,len);
+					b.position=0;
+					return new Integer(type, len, b);
+				case 0x06: // OBJECT IDENTIFIER:
+					b = new ByteArray;
+					der.readBytes(b,0,len);
+					b.position=0;
+					return new ObjectIdentifier(type, len, b);
+				default:
+					trace("I DONT KNOW HOW TO HANDLE DER stuff of TYPE "+type);
+					// fall through
+				case 0x04: // OCTET STRING
+				case 0x03: // BIT STRING
+					// stuff in a ByteArray for now.
+					var bs:ByteString = new ByteString(type, len);
+					der.readBytes(bs,0,len);
+					return bs;
+				case 0x05: // NULL
+					// if len!=0, something's horribly wrong.
+					// should I check?
+					return null;
+				case 0x13: // PrintableString
+					var ps:PrintableString = new PrintableString(type, len);
+					ps.setString(der.readMultiByte(len, "US-ASCII"));
+					return ps;
+				case 0x14: // T61String
+					ps = new PrintableString(type, len);
+					ps.setString(der.readMultiByte(len, "latin1"));
+					return ps;
+				case 0x17: // UTCTime
+					var ut:UTCTime = new UTCTime(type, len);
+					ut.setUTCTime(der.readMultiByte(len, "US-ASCII"));
+					return ut;
+			}
+		}
+	}
+}