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package org.bouncycastle.mail.smime.examples;
import java.io.FileInputStream;
import java.security.cert.X509Certificate;
import java.util.Collection;
import java.util.Iterator;
import java.util.Properties;
import javax.mail.BodyPart;
import javax.mail.Multipart;
import javax.mail.Session;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import org.bouncycastle.cert.X509CertificateHolder;
import org.bouncycastle.cert.jcajce.JcaX509CertificateConverter;
import org.bouncycastle.cms.SignerInformation;
import org.bouncycastle.cms.SignerInformationStore;
import org.bouncycastle.cms.jcajce.JcaSimpleSignerInfoVerifierBuilder;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.mail.smime.SMIMESigned;
import org.bouncycastle.util.Store;
/**
* a simple example that reads a basic SMIME signed mail file.
*/
public class ReadSignedMail
{
private static final String BC = BouncyCastleProvider.PROVIDER_NAME;
/**
* verify the signature (assuming the cert is contained in the message)
*/
private static void verify(
SMIMESigned s)
throws Exception
{
//
// extract the information to verify the signatures.
//
//
// certificates and crls passed in the signature
//
Store certs = s.getCertificates();
//
// 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.getMatches(signer.getSID());
Iterator certIt = certCollection.iterator();
X509Certificate cert = new JcaX509CertificateConverter().setProvider(BC).getCertificate((X509CertificateHolder)certIt.next());
//
// verify that the sig is correct and that it was generated
// when the certificate was current
//
if (signer.verify(new JcaSimpleSignerInfoVerifierBuilder().setProvider(BC).build(cert)))
{
System.out.println("signature verified");
}
else
{
System.out.println("signature failed!");
}
}
}
public static void main(
String[] args)
throws Exception
{
//
// Get a Session object with the default properties.
//
Properties props = System.getProperties();
Session session = Session.getDefaultInstance(props, null);
MimeMessage msg = new MimeMessage(session, new FileInputStream("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"))
{
SMIMESigned s = new SMIMESigned(
(MimeMultipart)msg.getContent());
//
// extract the content
//
MimeBodyPart content = s.getContent();
System.out.println("Content:");
Object cont = content.getContent();
if (cont instanceof String)
{
System.out.println((String)cont);
}
else if (cont instanceof Multipart)
{
Multipart mp = (Multipart)cont;
int count = mp.getCount();
for (int i = 0; i < count; i++)
{
BodyPart m = mp.getBodyPart(i);
Object part = m.getContent();
System.out.println("Part " + i);
System.out.println("---------------------------");
if (part instanceof String)
{
System.out.println((String)part);
}
else
{
System.out.println("can't print...");
}
}
}
System.out.println("Status:");
verify(s);
}
else if (msg.isMimeType("application/pkcs7-mime")
|| msg.isMimeType("application/x-pkcs7-mime"))
{
//
// in this case the content is wrapped in the signature block.
//
SMIMESigned s = new SMIMESigned(msg);
//
// extract the content
//
MimeBodyPart content = s.getContent();
System.out.println("Content:");
Object cont = content.getContent();
if (cont instanceof String)
{
System.out.println((String)cont);
}
System.out.println("Status:");
verify(s);
}
else
{
System.err.println("Not a signed message!");
}
}
}
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