1 files changed, 71 insertions, 0 deletions
diff --git a/libraries/spongycastle/mail/src/main/java/org/spongycastle/mail/smime/examples/ReadLargeEncryptedMail.java b/libraries/spongycastle/mail/src/main/java/org/spongycastle/mail/smime/examples/ReadLargeEncryptedMail.java
new file mode 100644
index 000000000..8389b443b
--- /dev/null
+++ b/libraries/spongycastle/mail/src/main/java/org/spongycastle/mail/smime/examples/ReadLargeEncryptedMail.java
@@ -0,0 +1,71 @@
+package org.bouncycastle.mail.smime.examples;
+
+import java.security.KeyStore;
+import java.security.PrivateKey;
+import java.security.cert.X509Certificate;
+import java.util.Properties;
+
+import javax.mail.Session;
+import javax.mail.internet.MimeBodyPart;
+import javax.mail.internet.MimeMessage;
+
+import org.bouncycastle.cms.RecipientId;
+import org.bouncycastle.cms.RecipientInformation;
+import org.bouncycastle.cms.RecipientInformationStore;
+import org.bouncycastle.cms.jcajce.JceKeyTransEnvelopedRecipient;
+import org.bouncycastle.cms.jcajce.JceKeyTransRecipientId;
+import org.bouncycastle.mail.smime.SMIMEEnvelopedParser;
+import org.bouncycastle.mail.smime.SMIMEUtil;
+import org.bouncycastle.mail.smime.util.SharedFileInputStream;
+
+/**
+ * a simple example that reads an encrypted email using the large file model.
+ * <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.
+ */
+public class ReadLargeEncryptedMail
+{
+    public static void main(
+        String args[])
+        throws Exception
+    {
+        if (args.length != 3)
+        {
+            System.err.println("usage: ReadLargeEncryptedMail pkcs12Keystore password outputFile");
+            System.exit(0);
+        }
+
+        //
+        // Open the key store
+        //
+        KeyStore    ks = KeyStore.getInstance("PKCS12", "BC");
+        String      keyAlias = ExampleUtils.findKeyAlias(ks, args[0], args[1].toCharArray());
+
+        //
+        // find the certificate for the private key and generate a 
+        // suitable recipient identifier.
+        //
+        X509Certificate cert = (X509Certificate)ks.getCertificate(keyAlias);
+        RecipientId     recId = new JceKeyTransRecipientId(cert);
+
+        //
+        // Get a Session object with the default properties.
+        //         
+        Properties props = System.getProperties();
+
+        Session session = Session.getDefaultInstance(props, null);
+
+        MimeMessage msg = new MimeMessage(session, new SharedFileInputStream("encrypted.message"));
+
+        SMIMEEnvelopedParser       m = new SMIMEEnvelopedParser(msg);
+
+        RecipientInformationStore   recipients = m.getRecipientInfos();
+        RecipientInformation        recipient = recipients.get(recId);
+
+        MimeBodyPart        res = SMIMEUtil.toMimeBodyPart(recipient.getContentStream(new JceKeyTransEnvelopedRecipient((PrivateKey)ks.getKey(keyAlias, null)).setProvider("BC")));
+
+        ExampleUtils.dumpContent(res, args[2]);
+    }
+}