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 * published by the Free Software Foundation.  Oracle designates this

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 * by Oracle in the LICENSE file that accompanied this code.

 *

 * 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

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 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

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package javax.crypto;

import java.security.*;

import java.security.spec.*;

/**

 * This class defines the <i>Service Provider Interface</i> (<b>SPI</b>)

 * for the <code>KeyGenerator</code> class.

 * All the abstract methods in this class must be implemented by each

 * cryptographic service provider who wishes to supply the implementation

 * of a key generator for a particular algorithm.

 *

 * @author Jan Luehe

 *

 * @see SecretKey

 * @since 1.4

 */

public abstract class KeyGeneratorSpi {

    /**

     * Initializes the key generator.

     *

     * @param random the source of randomness for this generator

     */

    protected abstract void engineInit(SecureRandom random);

    /**

     * Initializes the key generator with the specified parameter

     * set and a user-provided source of randomness.

     *

     * @param params the key generation parameters

     * @param random the source of randomness for this key generator

     *

     * @exception InvalidAlgorithmParameterException if <code>params</code> is

     * inappropriate for this key generator

     */

    protected abstract void engineInit(AlgorithmParameterSpec params,

                                       SecureRandom random)

        throws InvalidAlgorithmParameterException;

    /**

     * Initializes this key generator for a certain keysize, using the given

     * source of randomness.

     *

     * @param keysize the keysize. This is an algorithm-specific metric,

     * specified in number of bits.

     * @param random the source of randomness for this key generator

     *

     * @exception InvalidParameterException if the keysize is wrong or not

     * supported.

     */

    protected abstract void engineInit(int keysize, SecureRandom random);

    /**

     * Generates a secret key.

     *

     * @return the new key

     */

    protected abstract SecretKey engineGenerateKey();

}