Source Code Cross Referenced for RandomData.java in  » Portal » Open-Portal » com » sun » portal » ksecurity » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Portal » Open Portal » com.sun.portal.ksecurity 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*
02:         * @(#)RandomData.java	1.5 02/07/24 @(#)
03:         *
04:         * Copyright (c) 2000-2001 Sun Microsystems, Inc.  All rights reserved.
05:         * PROPRIETARY/CONFIDENTIAL
06:         * Use is subject to license terms.
07:         */
08:
09:        package com.sun.portal.ksecurity;
10:
11:        /**
12:         * Implements an abstract class that generalizes random number
13:         * generators.
14:         */
15:        public abstract class RandomData {
16:            /** Identifies a utility pseudo random number generation algorithm. */
17:            public static final byte ALG_PSEUDO_RANDOM = 1;
18:
19:            /** 
20:             * Identifies a cryptographically secure random number generation
21:             * algorithm.
22:             */
23:            public static final byte ALG_SECURE_RANDOM = 2;
24:
25:            /**
26:             * Protected constructor for subclassing.
27:             */
28:            protected RandomData() {
29:            }
30:
31:            /**
32:             * Creates a RandomData instance of the selected algorithm. <BR />
33:             * @param alg the desired random number generation algorithm, e.g. 
34:             * ALG_PSEUDO_RANDOM
35:             * @return a RandomData instance implementing the selected algorithm.
36:             * @exception CryptoException with reason code set to NO_SUCH_ALGORITHM
37:             * if an unsupported algorithm is requested. 
38:             * <P />
39:             * <B>WARNING:</B>  Requests for a secure random number generator
40:             * are currently redirected to a class that implements a weakly 
41:             * unpredictable source of random data. Licensees of this reference
42:             * implementation are strongly urged to link requests for 
43:             * ALG_SECURE_RANDOM to better generators that may be available
44:             * on their specific platforms.
45:             */
46:            public static RandomData getInstance(byte alg)
47:                    throws CryptoException {
48:                switch (alg) {
49:                case ALG_SECURE_RANDOM:
50:                    // return (new SRand());
51:                case ALG_PSEUDO_RANDOM:
52:                    return (new PRand());
53:                default:
54:                    throw new CryptoException(CryptoException.NO_SUCH_ALGORITHM);
55:                }
56:            }
57:
58:            /**
59:             * Generates random data. <BR />
60:             * @param buf output buffer in which the random data is to be placed
61:             * @param off starting offset within buf for the random data
62:             * @param len number of bytes of random data to be placed in buf
63:             */
64:            public abstract void generateData(byte[] buf, short off, short len);
65:
66:            /**
67:             * Seeds the random number generator. <BR />
68:             * @param buf input buffer containing the seed
69:             * @param off offset within buf where the seed starts
70:             * @param len number of bytes of seed data in buf
71:             */
72:            public abstract void setSeed(byte[] buf, short off, short len);
73:        }
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