133 lines
5 KiB
Java
133 lines
5 KiB
Java
/*
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* Copyright (c) 2011 Jan Dittberner
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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package de.communardo.jdi.bcsmime_demo;
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import java.security.KeyStore;
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import java.security.cert.CertStore;
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import java.security.cert.CertStoreParameters;
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import java.security.cert.Certificate;
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import java.security.cert.CollectionCertStoreParameters;
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import java.security.cert.X509CertSelector;
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import java.security.cert.X509Certificate;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.Enumeration;
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import java.util.List;
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import javax.mail.Address;
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import javax.mail.internet.InternetAddress;
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import javax.mail.internet.MimeBodyPart;
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import javax.mail.internet.MimeMessage;
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import org.bouncycastle.asn1.x509.GeneralName;
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import org.bouncycastle.cms.CMSAlgorithm;
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import org.bouncycastle.cms.RecipientInfoGenerator;
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import org.bouncycastle.cms.jcajce.JceCMSContentEncryptorBuilder;
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import org.bouncycastle.cms.jcajce.JceKeyTransRecipientInfoGenerator;
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import org.bouncycastle.mail.smime.SMIMEEnvelopedGenerator;
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import org.bouncycastle.operator.OutputEncryptor;
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/**
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* S/MIME encryption using the new BouncyCastle 1.46 APIs.
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*
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* @author Jan Dittberner
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*/
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public class SMIMEEncrypt {
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private final CertStore certs;
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/**
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* Creates a new SMIMEEncrypt instance.
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*
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* @param keystore
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* key store to use for recipient certificates
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*/
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public SMIMEEncrypt(KeyStore keystore) {
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List<Certificate> certificates = new ArrayList<Certificate>();
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try {
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Enumeration<String> aliases = keystore.aliases();
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while (aliases.hasMoreElements()) {
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Certificate cert = keystore.getCertificate(aliases
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.nextElement());
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if (cert != null) {
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certificates.add(cert);
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}
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}
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CertStoreParameters params = new CollectionCertStoreParameters(
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certificates);
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this.certs = CertStore.getInstance("Collection", params);
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} catch (Exception e) {
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throw new RuntimeException(e);
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}
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}
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/**
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* Encrypts a MimeMessage to all its recipients.
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*
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* @param message
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* MIME message to encrypt
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* @return encrypted S/MIME message
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* @throws Exception
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* if an error occurs
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*/
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public MimeMessage encryptMessage(MimeMessage message) throws Exception {
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SMIMEEnvelopedGenerator smeg = new SMIMEEnvelopedGenerator();
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for (Address recipient : message.getAllRecipients()) {
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Collection<? extends Certificate> certificates = getCertificates((InternetAddress) recipient);
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for (Certificate cert : certificates) {
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RecipientInfoGenerator recipientInfoGen = new JceKeyTransRecipientInfoGenerator(
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(X509Certificate) cert);
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smeg.addRecipientInfoGenerator(recipientInfoGen);
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}
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}
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OutputEncryptor encryptor = new JceCMSContentEncryptorBuilder(
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CMSAlgorithm.AES256_CBC).build();
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MimeBodyPart encryptedContent = smeg.generate(message, encryptor);
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MimeMessage result = new MimeMessage(message);
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result.setContent(encryptedContent.getContent(), encryptedContent
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.getContentType());
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result.saveChanges();
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return result;
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}
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/**
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* Helper method for getting certificates from a keystore.
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*
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* @param recipient
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* recipient address
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* @return X.509 certificate for recipient
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* @throws Exception
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* if an error occurs
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*/
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private Collection<? extends Certificate> getCertificates(
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InternetAddress recipient) throws Exception {
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X509CertSelector selector = new X509CertSelector();
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selector.setMatchAllSubjectAltNames(false);
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selector.addSubjectAlternativeName(GeneralName.rfc822Name, recipient
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.getAddress());
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return this.certs.getCertificates(selector);
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}
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}
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