Java example source code file (DSAKeyFactory.java)
The DSAKeyFactory.java Java example source code/*
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* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* 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 sun.security.provider;
import java.security.Key;
import java.security.PublicKey;
import java.security.PrivateKey;
import java.security.KeyFactorySpi;
import java.security.InvalidKeyException;
import java.security.AccessController;
import java.security.interfaces.DSAParams;
import java.security.spec.DSAPublicKeySpec;
import java.security.spec.DSAPrivateKeySpec;
import java.security.spec.KeySpec;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.X509EncodedKeySpec;
import java.security.spec.PKCS8EncodedKeySpec;
import sun.security.action.GetPropertyAction;
/**
* This class implements the DSA key factory of the Sun provider.
*
* @author Jan Luehe
*
*
* @since 1.2
*/
public class DSAKeyFactory extends KeyFactorySpi {
// package private for DSAKeyPairGenerator
static final boolean SERIAL_INTEROP;
private static final String SERIAL_PROP = "sun.security.key.serial.interop";
static {
/**
* Check to see if we need to maintain interoperability for serialized
* keys between JDK 5.0 -> JDK 1.4. In other words, determine whether
* a key object serialized in JDK 5.0 must be deserializable in
* JDK 1.4.
*
* If true, then we generate sun.security.provider.DSAPublicKey.
* If false, then we generate sun.security.provider.DSAPublicKeyImpl.
*
* By default this is false.
* This incompatibility was introduced by 4532506.
*/
String prop = AccessController.doPrivileged
(new GetPropertyAction(SERIAL_PROP, null));
SERIAL_INTEROP = "true".equalsIgnoreCase(prop);
}
/**
* Generates a public key object from the provided key specification
* (key material).
*
* @param keySpec the specification (key material) of the public key
*
* @return the public key
*
* @exception InvalidKeySpecException if the given key specification
* is inappropriate for this key factory to produce a public key.
*/
protected PublicKey engineGeneratePublic(KeySpec keySpec)
throws InvalidKeySpecException {
try {
if (keySpec instanceof DSAPublicKeySpec) {
DSAPublicKeySpec dsaPubKeySpec = (DSAPublicKeySpec)keySpec;
if (SERIAL_INTEROP) {
return new DSAPublicKey(dsaPubKeySpec.getY(),
dsaPubKeySpec.getP(),
dsaPubKeySpec.getQ(),
dsaPubKeySpec.getG());
} else {
return new DSAPublicKeyImpl(dsaPubKeySpec.getY(),
dsaPubKeySpec.getP(),
dsaPubKeySpec.getQ(),
dsaPubKeySpec.getG());
}
} else if (keySpec instanceof X509EncodedKeySpec) {
if (SERIAL_INTEROP) {
return new DSAPublicKey
(((X509EncodedKeySpec)keySpec).getEncoded());
} else {
return new DSAPublicKeyImpl
(((X509EncodedKeySpec)keySpec).getEncoded());
}
} else {
throw new InvalidKeySpecException
("Inappropriate key specification");
}
} catch (InvalidKeyException e) {
throw new InvalidKeySpecException
("Inappropriate key specification: " + e.getMessage());
}
}
/**
* Generates a private key object from the provided key specification
* (key material).
*
* @param keySpec the specification (key material) of the private key
*
* @return the private key
*
* @exception InvalidKeySpecException if the given key specification
* is inappropriate for this key factory to produce a private key.
*/
protected PrivateKey engineGeneratePrivate(KeySpec keySpec)
throws InvalidKeySpecException {
try {
if (keySpec instanceof DSAPrivateKeySpec) {
DSAPrivateKeySpec dsaPrivKeySpec = (DSAPrivateKeySpec)keySpec;
return new DSAPrivateKey(dsaPrivKeySpec.getX(),
dsaPrivKeySpec.getP(),
dsaPrivKeySpec.getQ(),
dsaPrivKeySpec.getG());
} else if (keySpec instanceof PKCS8EncodedKeySpec) {
return new DSAPrivateKey
(((PKCS8EncodedKeySpec)keySpec).getEncoded());
} else {
throw new InvalidKeySpecException
("Inappropriate key specification");
}
} catch (InvalidKeyException e) {
throw new InvalidKeySpecException
("Inappropriate key specification: " + e.getMessage());
}
}
/**
* Returns a specification (key material) of the given key object
* 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 <T extends KeySpec>
T engineGetKeySpec(Key key, Class<T> keySpec)
throws InvalidKeySpecException {
DSAParams params;
try {
if (key instanceof java.security.interfaces.DSAPublicKey) {
// Determine valid key specs
Class<?> dsaPubKeySpec = Class.forName
("java.security.spec.DSAPublicKeySpec");
Class<?> x509KeySpec = Class.forName
("java.security.spec.X509EncodedKeySpec");
if (dsaPubKeySpec.isAssignableFrom(keySpec)) {
java.security.interfaces.DSAPublicKey dsaPubKey
= (java.security.interfaces.DSAPublicKey)key;
params = dsaPubKey.getParams();
return keySpec.cast(new DSAPublicKeySpec(dsaPubKey.getY(),
params.getP(),
params.getQ(),
params.getG()));
} else if (x509KeySpec.isAssignableFrom(keySpec)) {
return keySpec.cast(new X509EncodedKeySpec(key.getEncoded()));
} else {
throw new InvalidKeySpecException
("Inappropriate key specification");
}
} else if (key instanceof java.security.interfaces.DSAPrivateKey) {
// Determine valid key specs
Class<?> dsaPrivKeySpec = Class.forName
("java.security.spec.DSAPrivateKeySpec");
Class<?> pkcs8KeySpec = Class.forName
("java.security.spec.PKCS8EncodedKeySpec");
if (dsaPrivKeySpec.isAssignableFrom(keySpec)) {
java.security.interfaces.DSAPrivateKey dsaPrivKey
= (java.security.interfaces.DSAPrivateKey)key;
params = dsaPrivKey.getParams();
return keySpec.cast(new DSAPrivateKeySpec(dsaPrivKey.getX(),
params.getP(),
params.getQ(),
params.getG()));
} else if (pkcs8KeySpec.isAssignableFrom(keySpec)) {
return keySpec.cast(new PKCS8EncodedKeySpec(key.getEncoded()));
} else {
throw new InvalidKeySpecException
("Inappropriate key specification");
}
} else {
throw new InvalidKeySpecException("Inappropriate key type");
}
} catch (ClassNotFoundException e) {
throw new InvalidKeySpecException
("Unsupported key specification: " + e.getMessage());
}
}
/**
* Translates a key object, whose provider may be unknown or potentially
* untrusted, into a corresponding key 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 Key engineTranslateKey(Key key) throws InvalidKeyException {
try {
if (key instanceof java.security.interfaces.DSAPublicKey) {
// Check if key originates from this factory
if (key instanceof sun.security.provider.DSAPublicKey) {
return key;
}
// Convert key to spec
DSAPublicKeySpec dsaPubKeySpec
= engineGetKeySpec(key, DSAPublicKeySpec.class);
// Create key from spec, and return it
return engineGeneratePublic(dsaPubKeySpec);
} else if (key instanceof java.security.interfaces.DSAPrivateKey) {
// Check if key originates from this factory
if (key instanceof sun.security.provider.DSAPrivateKey) {
return key;
}
// Convert key to spec
DSAPrivateKeySpec dsaPrivKeySpec
= engineGetKeySpec(key, DSAPrivateKeySpec.class);
// Create key from spec, and return it
return engineGeneratePrivate(dsaPrivKeySpec);
} else {
throw new InvalidKeyException("Wrong algorithm type");
}
} catch (InvalidKeySpecException e) {
throw new InvalidKeyException("Cannot translate key: "
+ e.getMessage());
}
}
}
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