Standard Verifier

Question

hi,
I need to have a standard verifier, that is a file will be signed using CAPICOM and a digital Certificate(This is a attached signature) in windows platform and the same file should be verified using Java in solaris platform, if the signature is correct then it should extract the original contents from the file.
Kindly let me know how to go about this situation. which API's i shuld use. If some one can send me the code it wuld be really helpful
thnx & regards
Vinodh

Answer 1

hi
thnx for the code, following is how i have implemented, i'm getting a exeception saying: "java.lang.IllegalArgumentException: unknown object in factory" i tied giving file input stream, object input stream and byte array input stream i get the same error. can you tell me how do i go about this
try {
                              FileInputStream datafis1 = new FileInputStream("bes.pdf.ssig");
                              //ObjectInputStream ois = new ObjectInputStream(datafis1);
                              byte bb[] = new byte[datafis1.available()];
                              datafis1.read(bb);
                              String st =new String(bb);
                              System.out.println("The Value 0 ");
                              ByteArrayInputStream bis = new ByteArrayInputStream(bb);
                              CMSSignedData s = new CMSSignedData(datafis1);
                              System.out.println(" Value 1 ");
               // the following line list the cert in the PKCS#7
               CertStore certs = s.getCertificatesAndCRLs("Collection","BC");
               // list the signers information
               SignerInformationStore signers = s.getSignerInfos();
               System.out.println(" Value 2 ");
               // Get Signers Infos
               Collection c = signers.getSigners();
               Iterator it = c.iterator();
               System.out.println(" Value 3 ");
               while(it.hasNext())
                                   SignerInformation signer = (SignerInformation)it.next();
                                        // for each signers get the ceritificate into cerCollection
                                   Collection certCollection = certs.getCertificates(signer.getSID());
                                   Iterator certIt = certCollection.iterator();
                                   X509Certificate cert = (X509Certificate) certIt.next();
                                   // Check the signature of the data was done by the certificate of the signer
                                   if(signer.verify(cert.getPublicKey(),"BC") )
                                        System.out.println("Verified TRUE");
                              System.out.println(" Value 4 ");
                         }catch(Exception e) {
                              System.out.println(" At BC Verifiyier "+e.toString());
Thnx in advance
Vinodh