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*
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
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package com.sun.crypto.provider;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactorySpi;
import javax.crypto.spec.DESedeKeySpec;
import java.security.InvalidKeyException;
import java.security.spec.KeySpec;
import java.security.spec.InvalidKeySpecException;
/**
* This class implements the DES-EDE key factory of the Sun provider.
*
* @author Jan Luehe
*
*/
public final class DESedeKeyFactory extends SecretKeyFactorySpi {
/**
* Verify the SunJCE provider in the constructor.
*
* @exception SecurityException if fails to verify
* its own integrity
*/
public DESedeKeyFactory() {
if (!SunJCE.verifySelfIntegrity(this.getClass())) {
throw new SecurityException("The SunJCE provider may have been " +
"tampered.");
}
}
/**
* 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 {
DESedeKey desEdeKey = null;
try {
if (keySpec instanceof DESedeKeySpec) {
DESedeKeySpec desEdeKeySpec = (DESedeKeySpec)keySpec;
desEdeKey = new DESedeKey(desEdeKeySpec.getKey());
} else {
throw new InvalidKeySpecException
("Inappropriate key specification");
}
} catch (InvalidKeyException e) {
}
return desEdeKey;
}
/**
* 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("DESede"))
&& (key.getFormat().equalsIgnoreCase("RAW"))) {
// Check if requested key spec is amongst the valid ones
if (DESedeKeySpec.class.isAssignableFrom(keySpec)) {
return new DESedeKeySpec(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 <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("DESede"))
&& (key.getFormat().equalsIgnoreCase("RAW"))) {
// Check if key originates from this factory
if (key instanceof com.sun.crypto.provider.DESedeKey) {
return key;
}
// Convert key to spec
DESedeKeySpec desEdeKeySpec
= (DESedeKeySpec)engineGetKeySpec(key,
DESedeKeySpec.class);
// Create key from spec, and return it
return engineGenerateSecret(desEdeKeySpec);
} else {
throw new InvalidKeyException
("Inappropriate key format/algorithm");
}
} catch (InvalidKeySpecException e) {
throw new InvalidKeyException("Cannot translate key");
}
}
}