阅读加密电子邮件

Question

我有一个PFX证书，我用它来阅读Outlook中的加密电子邮件。 我想通过Java阅读这封电子邮件。 我设法得到了一个javax.mail.Message对象的列表。 使用我的PFX密钥解密这些最简单的方法是什么？

Answer 1

使用BouncyCastle的和JavaMail的：

Store store = session.getStore("imaps"); 
store.connect("imap.gmail.com", "user@gmail.com", "gmailPassword"); 
System.out.println(store); 

Folder inbox = store.getFolder("MyFolder"); 
inbox.open(Folder.READ_ONLY); 
Message messages[] = inbox.getMessages(); 

for (Message message : messages) { 
    KeyStore ks = KeyStore.getInstance("pkcs12"); 

    FileInputStream fis = new FileInputStream("c:\\key.pfx"); 
    String password = "pfxPassword"; 

    ks.load(fis, password.toCharArray()); 
    String alias = ks.aliases().nextElement(); 

    PrivateKey pKey = (PrivateKey) ks.getKey(alias, password.toCharArray()); 
    X509Certificate cert = (X509Certificate) ks.getCertificate(alias); 

    RecipientId recId = new RecipientId(); 

    recId.setSerialNumber(cert.getSerialNumber()); 
    recId.setIssuer(cert.getIssuerX500Principal().getEncoded()); 

    SMIMEEnveloped m = new SMIMEEnveloped((MimeMessage) message); 
    RecipientInformationStore recipients = m.getRecipientInfos(); 
    RecipientInformation recipient = recipients.get(recId); 

    MimeBodyPart res = SMIMEUtil.toMimeBodyPart(recipient.getContent(pKey, ks.getProvider().getName())); 

    MimeMultipart parts=(MimeMultipart) res.getContent(); 

    for (int i=0;i<parts.getCount();i++){ 
     BodyPart part=parts.getBodyPart(i); 
     if (part.getContentType().contains("application/octet-stream")){ 
      //System.out.println(IOUtils.toString((InputStream) part.getContent())); 
      ZipInputStream zin = new ZipInputStream((InputStream)part.getContent()); 
      ZipEntry entry; 
      while((entry = zin.getNextEntry()) != null) { 
       System.out.println(IOUtils.toString(zin)); 
      } 
     } 
    } 
}