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package com.sun.crypto.provider;

import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactorySpi;
import javax.crypto.spec.DESKeySpec;
import java.security.InvalidKeyException;
import java.security.spec.KeySpec;
import java.security.spec.InvalidKeySpecException;

This class implements the DES key factory of the Sun provider.
Author:Jan Luehe
/** * This class implements the DES key factory of the Sun provider. * * @author Jan Luehe * */
public final class DESKeyFactory extends SecretKeyFactorySpi {
Empty constructor
/** * Empty constructor */
public DESKeyFactory() { }
Generates a SecretKey object from the provided key specification (key material).
Params:
  • keySpec – the specification (key material) of the secret key
Throws:
  • InvalidKeySpecException – if the given key specification is inappropriate for this key factory to produce a public key.
Returns:the secret key
/** * Generates a <code>SecretKey</code> object from the provided key * specification (key material). * * @param keySpec the specification (key material) of the secret key * * @return the secret key * * @exception InvalidKeySpecException if the given key specification * is inappropriate for this key factory to produce a public key. */
protected SecretKey engineGenerateSecret(KeySpec keySpec) throws InvalidKeySpecException { DESKey desKey = null; try { if (!(keySpec instanceof DESKeySpec)) { throw new InvalidKeySpecException ("Inappropriate key specification"); } else { DESKeySpec desKeySpec = (DESKeySpec)keySpec; desKey = new DESKey(desKeySpec.getKey()); } } catch (InvalidKeyException e) { } return desKey; }
Returns a specification (key material) of the given key in the requested format.
Params:
  • key – the key
  • keySpec – the requested format in which the key material shall be returned
Throws:
  • InvalidKeySpecException – if the requested key specification is inappropriate for the given key, or the given key cannot be processed (e.g., the given key has an unrecognized algorithm or format).
Returns:the underlying key specification (key material) in the requested format
/** * Returns a specification (key material) of the given key * in the requested format. * * @param key the key * * @param keySpec the requested format in which the key material shall be * returned * * @return the underlying key specification (key material) in the * requested format * * @exception InvalidKeySpecException if the requested key specification is * inappropriate for the given key, or the given key cannot be processed * (e.g., the given key has an unrecognized algorithm or format). */
protected KeySpec engineGetKeySpec(SecretKey key, Class keySpec) throws InvalidKeySpecException { try { if ((key instanceof SecretKey) && (key.getAlgorithm().equalsIgnoreCase("DES")) && (key.getFormat().equalsIgnoreCase("RAW"))) { // Check if requested key spec is amongst the valid ones if ((keySpec != null) && DESKeySpec.class.isAssignableFrom(keySpec)) { return new DESKeySpec(key.getEncoded()); } else { throw new InvalidKeySpecException ("Inappropriate key specification"); } } else { throw new InvalidKeySpecException ("Inappropriate key format/algorithm"); } } catch (InvalidKeyException e) { throw new InvalidKeySpecException("Secret key has wrong size"); } }
Translates a SecretKey object, whose provider may be unknown or potentially untrusted, into a corresponding SecretKey object of this key factory.
Params:
  • key – the key whose provider is unknown or untrusted
Throws:
Returns:the translated key
/** * Translates a <code>SecretKey</code> object, whose provider may be * unknown or potentially untrusted, into a corresponding * <code>SecretKey</code> object of this key factory. * * @param key the key whose provider is unknown or untrusted * * @return the translated key * * @exception InvalidKeyException if the given key cannot be processed by * this key factory. */
protected SecretKey engineTranslateKey(SecretKey key) throws InvalidKeyException { try { if ((key != null) && (key.getAlgorithm().equalsIgnoreCase("DES")) && (key.getFormat().equalsIgnoreCase("RAW"))) { // Check if key originates from this factory if (key instanceof com.sun.crypto.provider.DESKey) { return key; } // Convert key to spec DESKeySpec desKeySpec = (DESKeySpec)engineGetKeySpec(key, DESKeySpec.class); // Create key from spec, and return it return engineGenerateSecret(desKeySpec); } else { throw new InvalidKeyException ("Inappropriate key format/algorithm"); } } catch (InvalidKeySpecException e) { throw new InvalidKeyException("Cannot translate key"); } } }