01: /*
02: * @(#)SecureRandomSpi.java 1.13 06/10/10
03: *
04: * Copyright 1990-2006 Sun Microsystems, Inc. All Rights Reserved.
05: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
06: *
07: * This program is free software; you can redistribute it and/or
08: * modify it under the terms of the GNU General Public License version
09: * 2 only, as published by the Free Software Foundation.
10: *
11: * This program is distributed in the hope that it will be useful, but
12: * WITHOUT ANY WARRANTY; without even the implied warranty of
13: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14: * General Public License version 2 for more details (a copy is
15: * included at /legal/license.txt).
16: *
17: * You should have received a copy of the GNU General Public License
18: * version 2 along with this work; if not, write to the Free Software
19: * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20: * 02110-1301 USA
21: *
22: * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
23: * Clara, CA 95054 or visit www.sun.com if you need additional
24: * information or have any questions.
25: *
26: */
27:
28: package java.security;
29:
30: /**
31: * This class defines the <i>Service Provider Interface</i> (<b>SPI</b>)
32: * for the <code>SecureRandom</code> class.
33: * All the abstract methods in this class must be implemented by each
34: * service provider who wishes to supply the implementation
35: * of a cryptographically strong pseudo-random number generator.
36: *
37: * @version 1.7, 02/02/00
38: *
39: * @see SecureRandom
40: * @since 1.2
41: */
42:
43: public abstract class SecureRandomSpi implements java.io.Serializable {
44:
45: /**
46: * Reseeds this random object. The given seed supplements, rather than
47: * replaces, the existing seed. Thus, repeated calls are guaranteed
48: * never to reduce randomness.
49: *
50: * @param seed the seed.
51: */
52: protected abstract void engineSetSeed(byte[] seed);
53:
54: /**
55: * Generates a user-specified number of random bytes.
56: *
57: * @param bytes the array to be filled in with random bytes.
58: */
59: protected abstract void engineNextBytes(byte[] bytes);
60:
61: /**
62: * Returns the given number of seed bytes. This call may be used to
63: * seed other random number generators.
64: *
65: * @param numBytes the number of seed bytes to generate.
66: *
67: * @return the seed bytes.
68: */
69: protected abstract byte[] engineGenerateSeed(int numBytes);
70: }
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