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The Bouncy Castle Java CMS and S/MIME APIs for handling the CMS and S/MIME protocols. This jar contains CMS and S/MIME APIs for JDK 1.6. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs. If the S/MIME API is used, the JavaMail API and the Java activation framework will also be needed.
package org.bouncycastle.mail.smime.examples;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.security.KeyStore;
import java.util.Enumeration;
import javax.mail.MessagingException;
import javax.mail.internet.MimeBodyPart;
public class ExampleUtils
{
/**
* Dump the content of the passed in BodyPart to the file fileName.
*
* @throws MessagingException
* @throws IOException
*/
public static void dumpContent(
MimeBodyPart bodyPart,
String fileName)
throws MessagingException, IOException
{
//
// print mime type of compressed content
//
System.out.println("content type: " + bodyPart.getContentType());
//
// recover the compressed content
//
OutputStream out = new FileOutputStream(fileName);
InputStream in = bodyPart.getInputStream();
byte[] buf = new byte[10000];
int len;
while ((len = in.read(buf, 0, buf.length)) > 0)
{
out.write(buf, 0, len);
}
out.close();
}
public static String findKeyAlias(
KeyStore store,
String storeName,
char[] password)
throws Exception
{
store.load(new FileInputStream(storeName), password);
Enumeration e = store.aliases();
String keyAlias = null;
while (e.hasMoreElements())
{
String alias = (String)e.nextElement();
if (store.isKeyEntry(alias))
{
keyAlias = alias;
}
}
if (keyAlias == null)
{
throw new IllegalArgumentException("can't find a private key in keyStore: " + storeName);
}
return keyAlias;
}
}