Base64 Encoding Problem

Question

I have a String representation of an hexadecimal number such
that :
var s:String = "5300ca"; // 0x53, 0x00, 0xca
I want to cut this string into 3 bytes (0x53, 0x00, 0xca) to
use base64 encoding (3 x 8 bits returns 4 characters with base64
encoding). Here is my code :
import mx.utils.*;
import flash.utils.*;
var byte1:int = parseInt("0x53");
var byte2:int = parseInt("0x00");
var byte3:int = parseInt("0xca");
var b:ByteArray = new ByteArray();
b.writeMultiByte(String.fromCharCode(byte1) +
String.fromCharCode(byte2) + String.fromCharCode(byte3), "utf-16");
var base64Encoder:Base64Encoder = new Base64Encoder();
base64Encoder.encodeBytes(b);
var result:String = base64Encoder.drain(); // result = "Uw=="
The result string is "Uw==" whereas it should be "UwDK"
according to the normalized base64-encoding !
Is it a bug in the base-64 encoding ?

Answer 1

Very important because this limitation is very blocking
according to me. Nobody has an answer ?