private static byte[] deserializeIVRecord(DataInputStream dataStream) throws IOException, MessageFormatException {
      int ivSize = dataStream.readInt();
      return Utils.readBytesFromStream(dataStream, ivSize);
    }
Deserializes the iv from the stream
@param dataStream the {@link DataInputStream} from which iv needs to be deserialized
@return the iv thus deserialized from the stream
@throws IOException
@throws MessageFormatException
ambry-router/src/main/java/com/github/ambry/router/GCMCryptoService.java