jarsigner -verify -verbose -certs messagedigest.jar

         149 Sat Mar 19 07:20:06 EST 2005 META-INF/MANIFEST.MF
         270 Sat Mar 19 07:20:06 EST 2005 META-INF/MVP.SF
        5232 Sat Mar 19 07:20:06 EST 2005 META-INF/MVP.RSA
           0 Sat Mar 19 07:19:42 EST 2005 META-INF/
sm      5134 Sat Mar 19 07:19:38 EST 2005 MessageDigestApplet.class

      [entry was signed on 3/19/05 7:21 AM]
      X.509, CN=JavaScience Consulting, OU=Development, OU=Digital ID Class 3 - Microsoft Software Validation v2, O=JavaScience Consulting, L=Ottawa, ST=Ontario, C=CA
      [certificate is valid from 3/10/05 7:00 PM to 3/11/06 6:59 PM]
      X.509, CN=VeriSign Class 3 Code Signing 2004 CA, OU=Terms of use at https://www.verisign.com/rpa (c)04, OU=VeriSign Trust Network, O="VeriSign, Inc.", C=US
      [certificate is valid from 7/15/04 8:00 PM to 7/15/09 7:59 PM]
      X.509, OU=Class 3 Public Primary Certification Authority, O="VeriSign, Inc.", C=US
      [certificate is valid from 1/28/96 7:00 PM to 8/1/28 7:59 PM]


  s = signature was verified 
  m = entry is listed in manifest
  k = at least one certificate was found in keystore
  i = at least one certificate was found in identity scope

jar verified.