101 lines
3.6 KiB
Java
101 lines
3.6 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.io.ByteArrayInputStream;
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import java.security.KeyStore;
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import java.security.PrivateKey;
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import java.security.cert.X509Certificate;
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import java.util.Enumeration;
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import javax.mail.MessagingException;
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import javax.mail.Session;
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import javax.mail.internet.MimeMessage;
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import org.bouncycastle.cms.RecipientInformation;
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import org.bouncycastle.cms.RecipientInformationStore;
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import org.bouncycastle.cms.jcajce.JceKeyTransEnvelopedRecipient;
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import org.bouncycastle.cms.jcajce.JceKeyTransRecipientId;
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import org.bouncycastle.mail.smime.SMIMEEnveloped;
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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 SMIMEDecrypt {
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private final KeyStore keystore;
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/**
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* Create a new SMIMEDecrypt instance.
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*
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* @param argKeystore
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* keystore with private keys.
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*/
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public SMIMEDecrypt(KeyStore argKeystore) {
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this.keystore = argKeystore;
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}
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/**
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* Decrypt an encrypted S/MIME message.
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*
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* @param encrypted
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* encrypted S/MIME message
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* @return decrypted 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 decryptMessage(MimeMessage encrypted)
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throws MessagingException, Exception {
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SMIMEEnveloped message = new SMIMEEnveloped(encrypted);
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RecipientInformationStore recinfos = message.getRecipientInfos();
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Enumeration<String> aliases = this.keystore.aliases();
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RecipientInformation recid = null;
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String alias = null;
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while ((recid == null) && aliases.hasMoreElements()) {
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alias = aliases.nextElement();
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if (this.keystore.isKeyEntry(alias)) {
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recid = recinfos.get(new JceKeyTransRecipientId(
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(X509Certificate) this.keystore.getCertificate(alias)));
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}
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}
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if (recid == null) {
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throw new RuntimeException("No decryption key found");
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}
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JceKeyTransEnvelopedRecipient recipient = new JceKeyTransEnvelopedRecipient(
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(PrivateKey) this.keystore.getKey(alias, "changeit"
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.toCharArray()));
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byte[] content = recid.getContent(recipient);
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MimeMessage decrypted = new MimeMessage(Session
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.getDefaultInstance(System.getProperties()),
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new ByteArrayInputStream(content));
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decrypted.saveChanges();
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return decrypted;
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}
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}
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