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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 | } | ||