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copied!<p>I finally found exactly what I was looking for. I had just been confused by all the terms like <code>S/MIME</code>, <code>ASN.1</code>, <code>DER</code>, and so on. But finally, and seemingly by coincident, I reached the <code>CMS</code> (whatever that means) package from bouncycastle, which does everything I want. So here is my code:</p> <pre><code>package de.roland_illig.crypto; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.security.GeneralSecurityException; import java.security.Security; import java.security.cert.CertificateFactory; import java.security.cert.X509Certificate; import org.apache.commons.io.IOUtils; import org.bouncycastle.cms.CMSEnvelopedDataStreamGenerator; import org.bouncycastle.cms.CMSEnvelopedGenerator; import org.bouncycastle.cms.CMSException; import org.bouncycastle.jce.provider.BouncyCastleProvider; public class CryptDemo { private static final File DIR = new File("c:/program files/cygwin/home/roland/crypto/"); private static X509Certificate certificate() throws IOException, GeneralSecurityException { InputStream is = new FileInputStream(new File(DIR, "key.pub.der")); CertificateFactory cf = CertificateFactory.getInstance("X.509"); X509Certificate cert = (X509Certificate) cf.generateCertificate(is); is.close(); return cert; } private static void encrypt() throws IOException, GeneralSecurityException, CMSException { CMSEnvelopedDataStreamGenerator gen = new CMSEnvelopedDataStreamGenerator(); gen.addKeyTransRecipient(certificate()); InputStream is = new FileInputStream(new File(DIR, "secret")); OutputStream out = new FileOutputStream(new File(DIR, "secret.encrypted")); OutputStream encryptingOut = gen.open(out, CMSEnvelopedGenerator.AES128_CBC, "BC"); IOUtils.copy(is, encryptingOut); is.close(); encryptingOut.close(); out.close(); } public static void main(String[] args) throws Exception { Security.addProvider(new BouncyCastleProvider()); encrypt(); } } </code></pre>

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