我找不到任何可以帮助我的东西。我在保持smime电子邮件的签名时遇到问题。 我正在尝试获取加密的smime消息，解密它然后将其保存到数据库（这是工作的东西）。由于邮件首先被签名然后被加密，因此我认为在解密后保留签名没有问题。我可以成功解密消息。就在我尝试使用已签名和加密的邮件时，它无效。 我正在使用Java（1.8）和bouncycastle（jdk15on_154）。这一切都发生在一个静态方法的类中（因为我实际上是从delphi程序调用解密）。
这是班级：
public static void startSMimeDecryption (final String encryptedPath, String decryptedPath) {
logger.info("*** Start of sMIME decryption ***"); //$NON-NLS-1$
Properties props = System.getProperties();
Session session = Session.getDefaultInstance(props, null);
try {
logger.info("Encrypted message: [" + encryptedPath + "]"); //$NON-NLS-1$ //$NON-NLS-2$
File messageFile = new File(encryptedPath);
String fileExtension = getFileExtension(messageFile);
if (fileExtension != null) {
MimeMessage m = null;
if (fileExtension.toUpperCase().equals("EML")) { //$NON-NLS-1$
try (FileInputStream streamIn = new FileInputStream(encryptedPath);) {
logger.info("Created FileInputStream."); //$NON-NLS-1$
m = new MimeMessage(session, streamIn);
logger.info("Created MimeMessage."); //$NON-NLS-1$
} catch (IOException e) {
logger.error("Error while trying to read in message via stream. " + e.getMessage());
return;
}
} else if (fileExtension.toUpperCase().equals("MSG")) { //$NON-NLS-1$
m = createMimeMessageFromMsg(session, messageFile);
logger.info("Created MimeMessage."); //$NON-NLS-1$
} else {
throw new InvalidFileException("Not a supported file type (extension). Only '*.eml' and '*.msg' are accepted."); //$NON-NLS-1$
}
if ((m.getFileName() != null) && (m.getFileName().toUpperCase().equals("SMIME.P7M") || Pattern.compile("^\\s*application\\/(x-)?pkcs7-mime.*$", Pattern.DOTALL).matcher(m.getContentType()).matches())) { //$NON-NLS-1$ //$NON-NLS-2$
m = decryptMessage(m);
logger.info("Saving decrypted message to file..."); //$NON-NLS-1$
if (decryptedPath == null) {
String tempPath = messageFile.getAbsolutePath().substring(0, messageFile.getAbsolutePath().lastIndexOf(File.separator));
decryptedPath = tempPath + File.separator + FilenameUtils.removeExtension(messageFile.getName()) + "_decrypted.eml"; //$NON-NLS-1$
}
try (OutputStream str = Files.newOutputStream(Paths.get(decryptedPath))) {
m.writeTo(str);
} catch (IOException e) {
logger.error("Failed to write to output stream. " + e.getMessage()); //$NON-NLS-1$
return;
}
logger.info("Decrypted message: [" + decryptedPath + "]"); //$NON-NLS-1$ //$NON-NLS-2$
} else {
throw new NotEncryptedMessageException("Not an encrypted message. Breaking up decryption."); //$NON-NLS-1$
}
} else {
throw new InvalidFileException("No file extension found."); //$NON-NLS-1$
}
} catch (MessagingException | UnrecoverableKeyException | KeyStoreException | NoSuchAlgorithmException
| CMSException | InvalidFileException | InvalidMessageException e) {
logger.error("Failed to read message. " + e.getMessage()); //$NON-NLS-1$
} catch (NotEncryptedMessageException e) {
logger.error(e.getMessage());
System.exit(RETURNCODE_NODECRYPTION);
}
logger.info("*** End of sMIME decryption ***"); //$NON-NLS-1$
}
private static MimeMessage createMimeMessageFromMsg (final Session session, final File messageFile) {
MimeMessage mimeMsg = null;
if (messageFile != null) {
MAPIMessage mapiMsg = null;
logger.info("Converting .msg to MimeMessage."); //$NON-NLS-1$
try (NPOIFSFileSystem npoi = new NPOIFSFileSystem(messageFile)) {
logger.info("Created NPOIFSFileSystem."); //$NON-NLS-1$
mapiMsg = new MAPIMessage(npoi);
logger.info("Created MAPIMessage."); //$NON-NLS-1$
mimeMsg = new MimeMessage(session);
logger.info("Creating MimeMessage..."); //$NON-NLS-1$
// Header übertragen
try {
for (String current : mapiMsg.getHeaders()) {
try {
mimeMsg.addHeaderLine(current);
} catch (MessagingException e) {
logger.error("Could not add header line to MimeMessage. " + e.getMessage()); //$NON-NLS-1$
}
}
logger.info("Added header to MimeMessage."); //$NON-NLS-1$
} catch (ChunkNotFoundException e) {
logger.error("Could not retrieve header. " + e.getMessage()); //$NON-NLS-1$
}
// "Attachment" übertragen
for (AttachmentChunks current : mapiMsg.getAttachmentFiles()) {
try {
ByteArrayDataSource ds = new ByteArrayDataSource(current.getEmbeddedAttachmentObject(), "application/pkcs7-mime"); //$NON-NLS-1$
DataHandler dh = new DataHandler(ds);
mimeMsg.setDataHandler(dh);
logger.info("Added attachment to MimeMessage."); //$NON-NLS-1$
} catch (MessagingException e) {
logger.error("Could not transfer attachment into MimeMessage. " + e.getMessage()); //$NON-NLS-1$
}
}
} catch (IOException e) {
logger.error("Error while trying to build MimeMessage. " + e.getMessage()); //$NON-NLS-1$
mimeMsg = null;
}
}
return mimeMsg;
}
private static MimeMessage decryptMessage(final MimeMessage encrypted) throws MessagingException, CMSException,
KeyStoreException, UnrecoverableKeyException,
NoSuchAlgorithmException, InvalidMessageException {
if (encrypted != null) {
logger.info("Starting decrypting message..."); //$NON-NLS-1$
KeyStore keystore = getKeyStore();
SMIMEEnveloped message = new SMIMEEnveloped(encrypted);
RecipientInformationStore recinfos = message.getRecipientInfos();
Enumeration<String> aliases = keystore.aliases();
RecipientInformation recid = null;
String alias = null;
logger.info("Decrypting message..."); //$NON-NLS-1$
while ((recid == null) && aliases.hasMoreElements()) {
alias = aliases.nextElement();
if (keystore.isKeyEntry(alias)) {
Certificate cert = keystore.getCertificate(alias);
recid = recinfos.get(new JceKeyTransRecipientId((X509Certificate) cert));
}
}
if (recid == null) {
throw new RuntimeException("No decryption key found"); //$NON-NLS-1$
}
JceKeyTransEnvelopedRecipient recipient = new JceKeyTransEnvelopedRecipient((PrivateKey) keystore.getKey(alias, "changeit".toCharArray())); //$NON-NLS-1$
byte[] content = recid.getContent(recipient);
logger.info("Setting MimeMessage properties."); //$NON-NLS-1$
MimeMessage decrypted = new MimeMessage(Session.getDefaultInstance(System.getProperties()), new ByteArrayInputStream(content));
Enumeration<Header> headers = encrypted.getAllHeaders();
while (headers.hasMoreElements()) {
Header h = headers.nextElement();
if (decrypted.getHeader(h.getName()) == null) {
decrypted.addHeader(h.getName(), h.getValue());
}
}
decrypted.saveChanges();
logger.info("Decrypted message."); //$NON-NLS-1$
return decrypted;
} else {
throw new InvalidMessageException("Encrypted MimeMessage is null."); //$NON-NLS-1$
}
}
任何人都可以帮助我或解释，为什么加密的邮件工作完全正常，签名和加密根本不起作用（我得到一个无意义的损坏的文件）。 如果我没有正确发布（这是我的第一篇文章），我很抱歉。 谢谢你的回复。
编辑：当我使用加密和签名的电子邮件运行上述代码时，我收到一条看起来像这样的mime消息：
Content-Type: application/x-pkcs7-mime; name=smime.p7m; smime-
type=signed-data
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename=smime.p7m
MIME-Version: 1.0
Message-ID: <29771042.0.1481123386349.JavaMail.NAME@COMPUTER_NAME>
MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgMFADCABgkqhkiG9w0BBwGggCSABIIP
0ENvbnRlbnQtVHlwZTogbXVsdGlwYXJ0L2FsdGVybmF0aXZlOw0KCWJvdW5kYXJ5PSItLS0tPV9O [...]
答案 0 :(得分：1)
您的程序失败，因为“签名并加密”的S / MIME邮件不是SMIMEE开发的。它的数据格式错误。
如果您只是签署一条消息，则会得到类似
的结构如果您只是加密消息，则会得到类似
的结构应用此概念时没有独特的结构。相反，它只使用前两个结构：
所以发送时的操作是
作为收件人，您需要按其他顺序执行操作：
因此，对于签名和加密，您需要先将其作为签名邮件进行阅读，然后提取已签名的内容并将其作为封套邮件进行阅读。
这实际意味着您不能只保留签名和解密内容，因为签名涵盖了加密内容。您需要保存完整的原始签名邮件，以便稍后验证签名。