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ReadLargeSignedMail.javaAPI DocBouncy Castle Crypto API 1.41 (Java 1.5)3537Wed Oct 01 10:55:30 BST 2008org.bouncycastle.mail.smime.examples

ReadLargeSignedMail

public class ReadLargeSignedMail extends Object
a simple example that reads a basic SMIME signed mail file.

Fields Summary
Constructors Summary
Methods Summary
public static voidmain(java.lang.String[] args)

        //
        // Get a Session object with the default properties.
        //         
        Properties props = System.getProperties();

        Session session = Session.getDefaultInstance(props, null);

        MimeMessage msg = new MimeMessage(session, new SharedFileInputStream("signed.message"));

        //
        // make sure this was a multipart/signed message - there should be
        // two parts as we have one part for the content that was signed and
        // one part for the actual signature.
        //
        if (msg.isMimeType("multipart/signed"))
        {
            SMIMESignedParser             s = new SMIMESignedParser(
                                            (MimeMultipart)msg.getContent());

            System.out.println("Status:");

            verify(s);
        }
        else if (msg.isMimeType("application/pkcs7-mime"))
        {
            //
            // in this case the content is wrapped in the signature block.
            //
            SMIMESignedParser       s = new SMIMESignedParser(msg);

            System.out.println("Status:");

            verify(s);
        }
        else
        {
            System.err.println("Not a signed message!");
        }
private static voidverify(org.bouncycastle.mail.smime.SMIMESignedParser s)
verify the signature (assuming the cert is contained in the message)

        //
        // extract the information to verify the signatures.
        //

        //
        // certificates and crls passed in the signature - this must happen before
        // s.getSignerInfos()
        //
        CertStore               certs = s.getCertificatesAndCRLs(
                                                "Collection", "BC");

        //
        // SignerInfo blocks which contain the signatures
        //
        SignerInformationStore  signers = s.getSignerInfos();

        Collection              c = signers.getSigners();
        Iterator                it = c.iterator();

        //
        // check each signer
        //
        while (it.hasNext())
        {
            SignerInformation   signer = (SignerInformation)it.next();
            Collection          certCollection = certs.getCertificates(signer.getSID());

            Iterator        certIt = certCollection.iterator();
            X509Certificate cert = (X509Certificate)certIt.next();

            //
            // verify that the sig is correct and that it was generated
            // when the certificate was current
            //
            if (signer.verify(cert, "BC"))
            {
                System.out.println("signature verified");
            }
            else
            {
                System.out.println("signature failed!");
            }
        }