Below code works fine to unzip the zipped file (.zip), not password protected one.

ParameterPage MyParam = tools.getParameterPage(); ClipboardPage WorkPage = tools.getPrimaryPage(); ClipboardProperty StreamList = WorkPage.getProperty("pyModeList"); ClipboardProperty NamesList = WorkPage.getProperty("pyNames"); String TemplateName = MyParam.getString("TemplateName"); java.util.zip.ZipEntry entry = null; try { java.util.zip.ZipInputStream zipStream = new java.util.zip.ZipInputStream(new java.io.ByteArrayInputStream(Base64Util.decodeToByteArray(tools.findPage("AttachmentPage").getString("pyAttachStream")))); ArrayList<String> OutputList = new ArrayList<String>(); ArrayList<String> NameList = new ArrayList<String>();

     while((entry=zipStream.getNextEntry())!=null)   {    String entryName= entry.getName();     if (entryName != null)     {        NameList.add(entryName);      }    Boolean IsDirectory = false;    if (entryName.endsWith(java.io.File.separator))    {      IsDirectory = true;    }    int bytesRead = -1 ;    java.io.ByteArrayOutputStream outStream = new java.io.ByteArrayOutputStream();     int len= (int) entry.getSize();    byte[] tempBuffer = new byte[8192];    while((bytesRead = zipStream.read(tempBuffer))!= -1)    {      outStream.write(tempBuffer,0,bytesRead);    }         if (outStream!=null)    {           String EncodedOut = new com.pega.pegarules.pub.util.Base64Util().encodeToString( outStream.toByteArray());      OutputList.add(EncodedOut);    }        }   if(zipStream!=null)   {     zipStream.closeEntry();     zipStream.close();   } for(int i=0; i<OutputList.size();i++) {   StreamList.add(OutputList.get(i));   NamesList.add(NameList.get(i)); }

}  catch (Exception ex)  {oLog.infoForced("failed " + ex.getMessage());}