oracle.toplink.essentials.internal.security.JCEEncryptor Maven / Gradle / Ivy
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package oracle.toplink.essentials.internal.security;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.SecretKeyFactory;
import javax.crypto.CipherInputStream;
import javax.crypto.CipherOutputStream;
import oracle.toplink.essentials.internal.helper.Helper;
import oracle.toplink.essentials.exceptions.ValidationException;
import oracle.toplink.essentials.exceptions.ConversionException;
/**
* TopLink reference implementation for password encryption.
*
* @author Guy Pelletier
*/
public class JCEEncryptor implements Securable {
private Cipher m_cipher;
private final String m_algorithm = "DES";
private final String m_padding = "DES/ECB/PKCS5Padding";
public JCEEncryptor() throws Exception {
/*
* We want to force the initialization of the cipher here. This is a fix
* for bug #2696486.
* JDev with JDK 1.3 in some cases will allow a JCE object to be created
* when it shouldn't. That is, JDev includes an incompletely configured JCE
* library for JDK 1.3, meaning JCE will not run properly in the VM. So, JDev
* allows you to create a JCEEncryptor object, but eventually throw's
* errors when trying to make JCE library calls from encryptPassword.
*
* Confusing??? Well, don't move this code before talking to Guy first!
*/
m_cipher = Cipher.getInstance(m_padding);
}
/**
* Encrypts a string. Will throw a validation exception.
*/
public synchronized String encryptPassword(String password) {
try {
m_cipher.init(Cipher.ENCRYPT_MODE, Synergizer.getMultitasker(m_algorithm));
ByteArrayOutputStream baos = new ByteArrayOutputStream();
CipherOutputStream cos = new CipherOutputStream(baos, m_cipher);
ObjectOutputStream oos = new ObjectOutputStream(cos);
oos.writeObject(password);
oos.flush();
oos.close();
return Helper.buildHexStringFromBytes(baos.toByteArray());
} catch (Exception e) {
throw ValidationException.errorEncryptingPassword(e);
}
}
/**
* Decrypts a string. Will throw a validation exception.
* Handles backwards compatability for older encrypted strings.
*/
public synchronized String decryptPassword(String encryptedPswd) {
String password = "";
try {
m_cipher.init(Cipher.DECRYPT_MODE, Synergizer.getMultitasker(m_algorithm));
byte[] bytePassword = Helper.buildBytesFromHexString(encryptedPswd);
ByteArrayInputStream bais = new ByteArrayInputStream(bytePassword);
CipherInputStream cis = new CipherInputStream(bais, m_cipher);
ObjectInputStream ois = new ObjectInputStream(cis);
password = (String)ois.readObject();
ois.close();
} catch (IOException e) {
// JCE 1.2.2 couldn't decrypt it, assume clear text
password = encryptedPswd;
} catch (ArrayIndexOutOfBoundsException e) {
// JCE 1.2.1 couldn't decrypt it, assume clear text
password = encryptedPswd;
} catch (ConversionException e) {
// Never prepared (buildBytesFromHexString failed), assume clear text
password = encryptedPswd;
} catch (Exception e) {
throw ValidationException.errorDecryptingPassword(e);
}
return password;
}
private static class Synergizer {
private static String multitasker = "E60B80C7AEC78038";
static public SecretKey getMultitasker(String algorithm) throws Exception {
SecretKeyFactory skf = SecretKeyFactory.getInstance(algorithm);
return skf.generateSecret(new DESKeySpec(Helper.buildBytesFromHexString(multitasker)));
}
}
}