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# JNDI Properties for Local interaction with OpenEJB Naming Provider java.naming.factory.initial=org.apache.openejb.client.LocalInitialContextFactory
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Stateless Session EJB: Encryption Example
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The stateless session bean is a fantastic implementation choice for business processes which require no server-side state to be retained in between client invocations. If all information needed to process a request can be found in the request itself, the SLSB may be used as a highly efficient endpoint. In this example we build an encryption service capable of performing both one-way hashing and encryption/decryption operations. Additionally, we show here that SLSBs may indeed have their own internal state, so long as that it s not leaked out to the client during requests. Finally, we introduce the use of XML via environment entries to externalize configurable elements of the service.
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Wiki article: http://community.jboss.org/docs/DOC-15567 Source location: http://github.com/jbossejb3/oreilly-ejb-6thedition-book-examples/tree/ master/ch05-encryption/
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Following is a full listing of all source code used in this runnable example.
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Implementation Resources
EncryptionBean.java
package org.jboss.ejb3.examples.ch05.encryption; import import import import import import import import import import import import import import import import java.io.UnsupportedEncodingException; java.security.MessageDigest; java.security.NoSuchAlgorithmException; java.security.spec.AlgorithmParameterSpec; java.security.spec.KeySpec; javax.annotation.PostConstruct; javax.annotation.Resource; javax.crypto.Cipher; javax.crypto.SecretKey; javax.crypto.SecretKeyFactory; javax.crypto.spec.PBEKeySpec; javax.crypto.spec.PBEParameterSpec; javax.ejb.Local; javax.ejb.Remote; javax.ejb.SessionContext; javax.ejb.Stateless;
import org.apache.commons.codec.binary.Base64; import org.jboss.logging.Logger; /** * Bean implementation class of the EncryptionEJB. Shows * how lifecycle callbacks are implemented (@PostConstruct), * and two ways of obtaining externalized environment * entries. * * @author <a href="mailto:alr@jboss.org">ALR</a> */ @Stateless(name = EncryptionBean.EJB_NAME) @Local(EncryptionLocalBusiness.class) @Remote(EncryptionRemoteBusiness.class) public class EncryptionBean implements EncryptionLocalBusiness, EncryptionRemote Business { // ---------------------------------------------------------------------------|| // Class Members -------------------------------------------------------------|| // ---------------------------------------------------------------------------|| /** * Logger */ private static final Logger log = Logger.getLogger(EncryptionBean.class); /** * Name we'll assign to this EJB, will be referenced in the corresponding * META-INF/ejb-jar.xml file */ static final String EJB_NAME = "EncryptionEJB";
430 | Appendix B: Stateless Session EJB: Encryption Example
/** * Name of the environment entry representing the ciphers' passphrase supplied * in ejb-jar.xml */ private static final String ENV_ENTRY_NAME_CIPHERS_PASSPHRASE = "ciphersPass phrase"; /** * Name of the environment entry representing the message digest algorithm supplied * in ejb-jar.xml */ private static final String ENV_ENTRY_NAME_MESSAGE_DIGEST_ALGORITHM = "message DigestAlgorithm"; /** * Default Algorithm used by the Digest for one-way hashing */ private static final String DEFAULT_ALGORITHM_MESSAGE_DIGEST = "MD5"; /** * Charset used for encoding/decoding Strings to/from byte representation */ private static final String CHARSET = "UTF-8"; /** * Default Algorithm used by the Cipher Key for symmetric encryption */ private static final String DEFAULT_ALGORITHM_CIPHER = "PBEWithMD5AndDES"; /** * The default passphrase for symmetric encryption/decryption */ private static final String DEFAULT_PASSPHRASE = "LocalTestingPassphrase"; /** * The salt used in symmetric encryption/decryption */ private static final byte[] DEFAULT_SALT_CIPHERS = {(byte) 0xB4, (byte) 0xA2, (byte) 0x43, (byte) 0x89, 0x3E, (byte) 0xC5, (byte) 0x78, (byte) 0x53}; /** * Iteration count used for symmetric encryption/decryption */ private static final int DEFAULT_ITERATION_COUNT_CIPHERS = 20; // ---------------------------------------------------------------------------|| // Instance Members ----------------------------------------------------------|| // ---------------------------------------------------------------------------|| /* * The following members represent the internal * state of the Service. Note how these are *not* leaked out
* via the end-user API, and are hence part of "internal state" * and not "conversational state". */ /** * SessionContext of this EJB; this will be injected by the EJB * Container because it's marked w/ @Resource */ @Resource private SessionContext context; /** * Passphrase to use for the key in cipher operations; lazily initialized * and loaded via SessionContext.lookup */ private String ciphersPassphrase; /** * Algorithm to use in message digest (hash) operations, injected * via @Resource annotation with name property equal to env-entry name */ @Resource(name = ENV_ENTRY_NAME_MESSAGE_DIGEST_ALGORITHM) private String messageDigestAlgorithm; /** * Digest used for one-way hashing */ private MessageDigest messageDigest; /** * Cipher used for symmetric encryption */ private Cipher encryptionCipher; /** * Cipher used for symmetric decryption */ private Cipher decryptionCipher; // ---------------------------------------------------------------------------|| // Lifecycle -----------------------------------------------------------------|| // ---------------------------------------------------------------------------|| /** * Initializes this service before it may handle requests * * @throws Exception If some unexpected error occurred */ @PostConstruct public void initialize() throws Exception { // Log that we're here log.info("Initializing, part of " + PostConstruct.class.getName() + " lifecycle");
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