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| 1 | +/* | |
| 2 | + * Copyright (c) 1998, 2005, Oracle and/or its affiliates. All rights reserved. | |
| 3 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 | + * | |
| 5 | + * This code is free software; you can redistribute it and/or modify it | |
| 6 | + * under the terms of the GNU General Public License version 2 only, as | |
| 7 | + * published by the Free Software Foundation. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | + | |
| 26 | +package java.security; | |
| 27 | + | |
| 28 | +/** | |
| 29 | + * This class defines the <i>Service Provider Interface</i> (<b>SPI</b>) | |
| 30 | + * for the <code>SecureRandom</code> class. | |
| 31 | + * All the abstract methods in this class must be implemented by each | |
| 32 | + * service provider who wishes to supply the implementation | |
| 33 | + * of a cryptographically strong pseudo-random number generator. | |
| 34 | + * | |
| 35 | + * | |
| 36 | + * @see SecureRandom | |
| 37 | + * @since 1.2 | |
| 38 | + */ | |
| 39 | + | |
| 40 | +public abstract class SecureRandomSpi implements java.io.Serializable { | |
| 41 | + | |
| 42 | + private static final long serialVersionUID = -2991854161009191830L; | |
| 43 | + | |
| 44 | + /** | |
| 45 | + * Reseeds this random object. The given seed supplements, rather than | |
| 46 | + * replaces, the existing seed. Thus, repeated calls are guaranteed | |
| 47 | + * never to reduce randomness. | |
| 48 | + * | |
| 49 | + * @param seed the seed. | |
| 50 | + */ | |
| 51 | + protected abstract void engineSetSeed(byte[] seed); | |
| 52 | + | |
| 53 | + /** | |
| 54 | + * Generates a user-specified number of random bytes. | |
| 55 | + * | |
| 56 | + * <p> If a call to <code>engineSetSeed</code> had not occurred previously, | |
| 57 | + * the first call to this method forces this SecureRandom implementation | |
| 58 | + * to seed itself. This self-seeding will not occur if | |
| 59 | + * <code>engineSetSeed</code> was previously called. | |
| 60 | + * | |
| 61 | + * @param bytes the array to be filled in with random bytes. | |
| 62 | + */ | |
| 63 | + protected abstract void engineNextBytes(byte[] bytes); | |
| 64 | + | |
| 65 | + /** | |
| 66 | + * Returns the given number of seed bytes. This call may be used to | |
| 67 | + * seed other random number generators. | |
| 68 | + * | |
| 69 | + * @param numBytes the number of seed bytes to generate. | |
| 70 | + * | |
| 71 | + * @return the seed bytes. | |
| 72 | + */ | |
| 73 | + protected abstract byte[] engineGenerateSeed(int numBytes); | |
| 74 | +} | |