Flex 4.0 HMAC.hash binary data

I've solved this problem by adding self-made function in HMAC Class:

/**
* Performs the HMAC hash algorithm using string.
* This function equals php "hash_hmac" function when "raw_output" parameter is set to true.
* @param secret The secret key
* @param message The message to hash
* @param algorithm Hash object to use
* @return raw binary data as ByteArray
*/
public static function getRawHash(secret:String, message:String, algorithm:Object = null):ByteArray {
          var hexHash:String = hash(secret, message, algorithm); 
          var hashBinary:ByteArray = new ByteArray();
          for (var i:uint = 0; i < hexHash.length; i += 2) {
               var c:String = hexHash.charAt(i) + hexHash.charAt(i + 1);
               hashBinary.writeByte(parseInt(c, 16));
          }
          return hashBinary; 
}

After, if you neen "base64" string you can do something like that:

private function createHashForSign(secretKey:String, message:String):String {
          var hash:ByteArray = HMAC.getRawHash(secretKey, message, SHA1); 
          var baseEncoder:Base64Encoder = new Base64Encoder();
          baseEncoder.encodeBytes(hash, 0, hash.length); 
          return baseEncoder.toString(); 
}