本文介绍了BouncyCastle的加密邮件与SMIME和X.509的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我试图发送加密邮件与的JavaMail 库和 BouncyCastle的库：
I'm trying to send a encrypted mail with JavaMail Library and BouncyCastle Library:
这是在code我已经写了，或者我也跟着教程：
This is the code I've written, or I followed a tutorial:
public class SendMail extends javax.mail.Authenticator {
private String _user;
private String _pass;
private String[] _to;
private String _from;
private String _port;
private String _sport;
private String _host;
private String _subject;
private String _body;
private boolean _auth;
private boolean _debuggable;
private Multipart _multipart;
SharedPreferences sharedPrefs;
InputStream privateKeyStoreInputStream;
InputStream publicCertificateInputStream;
InputStream publicKeystoreInputStream;
public static final String ksPassword = "mobile";
Certificate[] chain;
PrivateKey privateKey;
Certificate rcptCert;
CertificateFactory cf;
public SendMail() {
_user = ""; // username
_pass = ""; // password
_from = ""; // email sent from
_subject = ""; // email subject
_body = ""; // email body
_debuggable = false; // debug mode on or off - default off
_auth = true; // smtp authentication - default on
_multipart = new MimeMultipart();
// There is something wrong with MailCap, javamail can not find a
// handler for the multipart/mixed part, so this bit needs to be added.
MailcapCommandMap mc = (MailcapCommandMap) CommandMap
.getDefaultCommandMap();
mc.addMailcap("application/pkcs7-signature;; x-java-content-handler=org.bouncycastle.mail.smime.handlers.pkcs7_signature");
mc.addMailcap("application/pkcs7-mime;; x-java-content-handler=org.bouncycastle.mail.smime.handlers.pkcs7_mime");
mc.addMailcap("application/x-pkcs7-signature;; x-java-content-handler=org.bouncycastle.mail.smime.handlers.x_pkcs7_signature");
mc.addMailcap("application/x-pkcs7-mime;; x-java-content-handler=org.bouncycastle.mail.smime.handlers.x_pkcs7_mime");
mc.addMailcap("multipart/signed;; x-java-content-handler=org.bouncycastle.mail.smime.handlers.multipart_signed");
CommandMap.setDefaultCommandMap(mc);
Security.addProvider(new BouncyCastleProvider());
}
public SendMail(Context c, InputStream privateKeyStoreInputStream,
InputStream publicCertificateInputStream,
InputStream publicKeystoreInputStream) {
this();
this.privateKeyStoreInputStream = privateKeyStoreInputStream;
this.publicCertificateInputStream = publicCertificateInputStream;
this.publicKeystoreInputStream = publicKeystoreInputStream;
_host = "removed";
_port = "25";
_sport = "25";
_user = "removed";
_pass = "removed";
try {
KeyStore keystore = KeyStore.getInstance("PKCS12", "BC");
keystore.load(privateKeyStoreInputStream, ksPassword.toCharArray());
Enumeration e = keystore.aliases();
String keyAlias = null;
while (e.hasMoreElements() && (keyAlias == null)) {
String alias = (String) e.nextElement();
keyAlias = keystore.isKeyEntry(alias) ? alias : null;
}
if (keyAlias == null) {
Log.e("KEY ALIAS: ", "NULL");
return;
}
chain = keystore.getCertificateChain(keyAlias);
/* Get the private key to sign the message */
privateKey = (PrivateKey) keystore.getKey(keyAlias,
ksPassword.toCharArray());
if (privateKey == null) {
Log.e("No Private key for: ", keyAlias);
}
/* Get the public key of reciepient */
BufferedInputStream bis = new BufferedInputStream(
publicCertificateInputStream);
cf = CertificateFactory.getInstance("X.509");
rcptCert = cf.generateCertificate(bis);
} catch (KeyStoreException e) {
Log.e("KeyStore Exception: ", e.getMessage());
} catch (NoSuchProviderException e) {
Log.e("NoSuchProvider Exception: ", e.getMessage());
} catch (CertificateException ce) {
Log.e("Certification Exception: ", ce.getMessage());
} catch (NoSuchAlgorithmException ns) {
Log.e("NoSuchAlgorithm Exception: ", ns.getMessage());
} catch (IOException e) {
Log.e("IO Exception: ", e.getMessage());
} catch (UnrecoverableKeyException uke) {
Log.e("UnrecoverableKeyException: ", uke.getMessage());
}
}
public boolean send() throws Exception {
Properties props = _setProperties();
if (!_user.equals("") && !_pass.equals("") && _to.length > 0
&& !_from.equals("") && !_subject.equals("")
&& !_body.equals("")) {
Session session = Session.getInstance(props,
new GMailAuthenticator(_user, _pass));
MimeMessage msg = new MimeMessage(session);
msg.setFrom(new InternetAddress(_from));
InternetAddress[] addressTo = new InternetAddress[_to.length];
for (int i = 0; i < _to.length; i++) {
addressTo[i] = new InternetAddress(_to[i]);
}
msg.setRecipients(MimeMessage.RecipientType.TO, addressTo);
msg.setSubject(_subject);
msg.setSentDate(new Date());
// setup message body
BodyPart messageBodyPart = new MimeBodyPart();
messageBodyPart.setText(_body);
_multipart.addBodyPart(messageBodyPart);
// Put parts in message
msg.setContent(_multipart);
/* Create SMIMESignedGenerator */
SMIMECapabilityVector capabilities = new SMIMECapabilityVector();
capabilities.addCapability(SMIMECapability.dES_EDE3_CBC);
capabilities.addCapability(SMIMECapability.rC2_CBC, 128);
capabilities.addCapability(SMIMECapability.dES_CBC);
ASN1EncodableVector attributes = new ASN1EncodableVector();
// attributes.add(new SMIMEEncryptionKeyPreferenceAttribute(new
// org.bouncycastle.asn1.cms.IssuerAndSerialNumber(new
// X509Name(((X509Certificate)chain[0]).getIssuerDN().getName()),
// ((X509Certificate)chain[0]).getSerialNumber())));
attributes.add(new SMIMECapabilitiesAttribute(capabilities));
SMIMESignedGenerator signer = new SMIMESignedGenerator();
signer.addSigner(
privateKey,
(X509Certificate) chain[0],
"DSA".equals(privateKey.getAlgorithm()) ? SMIMESignedGenerator.DIGEST_SHA1
: SMIMESignedGenerator.DIGEST_MD5,
new AttributeTable(attributes), null);
/* Add the list of certs to the generator */
List certList = new ArrayList();
certList.add(chain[0]);
CertStore certs = CertStore.getInstance("Collection",
new CollectionCertStoreParameters(certList), "BC");
signer.addCertificatesAndCRLs(certs);
/* Sign the message and copy all headers from original message */
MimeMultipart multipart = signer.generate(msg, "BC");
MimeMessage signedMessage = new MimeMessage(session);
Enumeration headers = msg.getAllHeaderLines();
while (headers.hasMoreElements()) {
signedMessage.addHeaderLine((String) headers.nextElement());
}
signedMessage.setContent(_multipart);
signedMessage.saveChanges();
/* Create the encrypter and encrypt the message */
SMIMEEnvelopedGenerator encrypter = new SMIMEEnvelopedGenerator();
encrypter.addKeyTransRecipient((X509Certificate) chain[0]);
encrypter.addKeyTransRecipient((X509Certificate) rcptCert);
MimeBodyPart encryptedPart = encrypter.generate(signedMessage,
SMIMEEnvelopedGenerator.RC2_CBC, 128, "BC");
ByteArrayOutputStream out = new ByteArrayOutputStream();
encryptedPart.writeTo(out);
Session smtpSession = Session.getInstance(props, null);
MimeMessage smtpMessage = new MimeMessage(smtpSession,
new ByteArrayInputStream(out.toByteArray()));
smtpMessage.saveChanges();
Transport.send(smtpMessage);
return true;
} else {
return false;
}
}
public void addAttachment(String filename) throws Exception {
BodyPart messageBodyPart = new MimeBodyPart();
DataSource source = new FileDataSource(filename);
messageBodyPart.setDataHandler(new DataHandler(source));
messageBodyPart.setFileName(filename);
_multipart.addBodyPart(messageBodyPart);
}
class GMailAuthenticator extends Authenticator {
String user;
String pw;
public GMailAuthenticator(String username, String password) {
super();
this.user = username;
this.pw = password;
}
public PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(user, pw);
}
}
private Properties _setProperties() {
Properties props = new Properties();
props.put("mail.smtp.host", _host);
props.put("mail.smtp.starttls.enable", "true");
props.put("mail.smtp.connectiontimeout", "20000"); // timeout with mail
// 20 sec.
if (_debuggable) {
props.put("mail.debug", "true");
}
if (_auth) {
props.put("mail.smtp.auth", "true");
}
props.put("mail.smtp.port", _port);
props.put("mail.smtp.socketFactory.port", _sport);
props.put("mail.smtp.socketFactory.fallback", "true");
return props;
}
public String getBody() {
return _body;
}
public void setBody(String _body) {
this._body = _body;
}
public void setTo(String[] toArr) {
this._to = toArr;
}
public void setFrom(String string) {
this._from = string;
}
public void setSubject(String string) {
this._subject = string;
}
}
当我调试应用程序，唯一的应用程序崩溃，在此以下行：
When I debug the application, the only app crashes at this following line:
SMIMESignedGenerator signer = new SMIMESignedGenerator();
这是我Dalvik的得到的唯一错误消息：
This is the only error message I get from dalvik:
DexOpt: unable to optimize static field ref 0x0991 at 0x18 in Lorg/bouncycastle/mail/smime/SMIMESignedGenerator;.<clinit>
我所有的外部的.jar 文件所在的文件夹下库。
All of my external .jar files is located under the folder libs.
是否有人知道为什么会这样？已经有人成功了加密与SMIME / X.509邮件？或者是有一个更简单的方法来做到这一点？
Does anybody know why this happens? Have anybody succeeded encrypting a mail with SMIME/X.509? Or is there a much simpler way to do this?
推荐答案
如果我明白你想实现的，你不只是加密MIME消息，你是签名和加密（并且必须按照这个顺序做）
If I understand what you try to achieve, you are not just encrypting a MIME message, you are signing and encrypting it (and it must be done in that order)
该BouncyCastle的规定为例，签署电子邮件是here该BouncyCastle的提供的例子来加密电子邮件是here
The BouncyCastle provided example to signing an email is hereThe BouncyCastle provided example to encrypting an email is here
最后，签订BodyPart的让你一个多部分，你必须包装在一个MimeBodyPart你加密，它可以让你的加密MimeBodyPart你在的MimeMessage插入（见加密例子）
Finally, signing a BodyPart gets you a Multipart that you must wrap in a MimeBodyPart that you encrypt, which gets you an encrypted MimeBodyPart which you "insert" in a MimeMessage (see encryption example)
这篇关于BouncyCastle的加密邮件与SMIME和X.509的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！