1 files changed, 105 insertions, 0 deletions
diff --git a/libraries/spongycastle/mail/src/main/java/org/spongycastle/mail/smime/examples/CreateLargeEncryptedMail.java b/libraries/spongycastle/mail/src/main/java/org/spongycastle/mail/smime/examples/CreateLargeEncryptedMail.java
new file mode 100644
index 000000000..5fc7663a9
--- /dev/null
+++ b/libraries/spongycastle/mail/src/main/java/org/spongycastle/mail/smime/examples/CreateLargeEncryptedMail.java
@@ -0,0 +1,105 @@
+package org.bouncycastle.mail.smime.examples;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.security.KeyStore;
+import java.security.cert.Certificate;
+import java.security.cert.X509Certificate;
+import java.util.Properties;
+
+import javax.activation.DataHandler;
+import javax.activation.FileDataSource;
+import javax.mail.Address;
+import javax.mail.Message;
+import javax.mail.Session;
+import javax.mail.internet.InternetAddress;
+import javax.mail.internet.MimeBodyPart;
+import javax.mail.internet.MimeMessage;
+
+import org.bouncycastle.cms.CMSAlgorithm;
+import org.bouncycastle.cms.jcajce.JceCMSContentEncryptorBuilder;
+import org.bouncycastle.cms.jcajce.JceKeyTransRecipientInfoGenerator;
+import org.bouncycastle.mail.smime.SMIMEEnvelopedGenerator;
+
+/**
+ * a simple example that creates a single encrypted mail message.
+ * <p>
+ * The key store can be created using the class in
+ * org.bouncycastle.jce.examples.PKCS12Example - the program expects only one
+ * key to be present in the key file.
+ * <p>
+ * Note: while this means that both the private key is available to
+ * the program, the private key is retrieved from the keystore only for
+ * the purposes of locating the corresponding public key, in normal circumstances
+ * you would only be doing this with a certificate available.
+ */
+public class CreateLargeEncryptedMail
+{
+    public static void main(
+        String args[])
+        throws Exception
+    {
+        if (args.length != 3)
+        {
+            System.err.println("usage: CreateLargeEncryptedMail pkcs12Keystore password inputFile");
+            System.exit(0);
+        }
+
+        //
+        // Open the key store
+        //
+        KeyStore    ks = KeyStore.getInstance("PKCS12", "BC");
+        String      keyAlias = ExampleUtils.findKeyAlias(ks, args[0], args[1].toCharArray());
+
+        Certificate[]   chain = ks.getCertificateChain(keyAlias);
+
+        //
+        // create the generator for creating an smime/encrypted message
+        //
+        SMIMEEnvelopedGenerator  gen = new SMIMEEnvelopedGenerator();
+          
+        gen.addRecipientInfoGenerator(new JceKeyTransRecipientInfoGenerator((X509Certificate)chain[0]).setProvider("BC"));
+
+        //
+        // create a subject key id - this has to be done the same way as
+        // it is done in the certificate associated with the private key
+        // version 3 only.
+        //
+        /*
+        MessageDigest           dig = MessageDigest.getInstance("SHA1", "BC");
+
+        dig.update(cert.getPublicKey().getEncoded());
+              
+        gen.addKeyTransRecipient(cert.getPublicKey(), dig.digest());
+        */
+         
+        //
+        // create the base for our message
+        //
+        MimeBodyPart    msg = new MimeBodyPart();
+
+        msg.setDataHandler(new DataHandler(new FileDataSource(new File(args[2]))));
+        msg.setHeader("Content-Type", "application/octet-stream");
+        msg.setHeader("Content-Transfer-Encoding", "binary");
+
+        MimeBodyPart mp = gen.generate(msg, new JceCMSContentEncryptorBuilder(CMSAlgorithm.RC2_CBC).setProvider("BC").build());
+        
+        //
+        // Get a Session object and create the mail message
+        //
+        Properties props = System.getProperties();
+        Session session = Session.getDefaultInstance(props, null);
+
+        Address fromUser = new InternetAddress("\"Eric H. Echidna\"<eric@bouncycastle.org>");
+        Address toUser = new InternetAddress("example@bouncycastle.org");
+
+        MimeMessage body = new MimeMessage(session);
+        body.setFrom(fromUser);
+        body.setRecipient(Message.RecipientType.TO, toUser);
+        body.setSubject("example encrypted message");
+        body.setContent(mp.getContent(), mp.getContentType());
+        body.saveChanges();
+
+        body.writeTo(new FileOutputStream("encrypted.message"));
+    }
+}