| /* |
| * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * 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 |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| 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. |
| * |
| * <p>In case the client does not explicitly initialize the KeyGenerator |
| * (via a call to an {@code init} method), each provider must |
| * supply (and document) a default initialization. |
| * See the Keysize Restriction sections of the |
| * {@extLink security_guide_jdk_providers JDK Providers} |
| * document for information on the KeyGenerator defaults used by |
| * JDK providers. |
| * However, note that defaults may vary across different providers. |
| * Additionally, the default value for a provider may change in a future |
| * version. Therefore, it is recommended to explicitly initialize the |
| * KeyGenerator instead of relying on provider-specific defaults. |
| * |
| * @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(); |
| } |