Source Code Cross Referenced for KeyPairGeneratorSpi.java in  » 6.0-JDK-Modules » j2me » java » security » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » java.security 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * @(#)KeyPairGeneratorSpi.java	1.17 06/10/10
003:         *
004:         * Copyright  1990-2006 Sun Microsystems, Inc. All Rights Reserved.  
005:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER  
006:         *   
007:         * This program is free software; you can redistribute it and/or  
008:         * modify it under the terms of the GNU General Public License version  
009:         * 2 only, as published by the Free Software Foundation.   
010:         *   
011:         * This program is distributed in the hope that it will be useful, but  
012:         * WITHOUT ANY WARRANTY; without even the implied warranty of  
013:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU  
014:         * General Public License version 2 for more details (a copy is  
015:         * included at /legal/license.txt).   
016:         *   
017:         * You should have received a copy of the GNU General Public License  
018:         * version 2 along with this work; if not, write to the Free Software  
019:         * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  
020:         * 02110-1301 USA   
021:         *   
022:         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa  
023:         * Clara, CA 95054 or visit www.sun.com if you need additional  
024:         * information or have any questions. 
025:         *
026:         */
027:
028:        package java.security;
029:
030:        import java.security.spec.AlgorithmParameterSpec;
031:
032:        /**
033:         * <p> This class defines the <i>Service Provider Interface</i> (<b>SPI</b>)
034:         * for the <code>KeyPairGenerator</code> class, which is used to generate
035:         * pairs of public and private keys.
036:         *
037:         * <p> All the abstract methods in this class must be implemented by each
038:         * cryptographic service provider who wishes to supply the implementation
039:         * of a key pair generator for a particular algorithm.
040:         * 
041:         * <p> In case the client does not explicitly initialize the KeyPairGenerator
042:         * (via a call to an <code>initialize</code> method), each provider must
043:         * supply (and document) a default initialization.
044:         * For example, the <i>Sun</i> provider uses a default modulus size (keysize)
045:         * of 1024 bits.
046:         *
047:         * @author Benjamin Renaud
048:         *
049:         * @version 1.11, 02/02/00
050:         *
051:         * @see KeyPairGenerator
052:         * @see java.security.spec.AlgorithmParameterSpec
053:         */
054:
055:        public abstract class KeyPairGeneratorSpi {
056:
057:            /**
058:             * Initializes the key pair generator for a certain keysize, using
059:             * the default parameter set.
060:             *
061:             * @param keysize the keysize. This is an
062:             * algorithm-specific metric, such as modulus length, specified in
063:             * number of bits.
064:             *
065:             * @param random the source of randomness for this generator.
066:             *
067:             * @exception InvalidParameterException if the <code>keysize</code> is not
068:             * supported by this KeyPairGeneratorSpi object.
069:             */
070:            public abstract void initialize(int keysize, SecureRandom random);
071:
072:            /**
073:             * Initializes the key pair generator using the specified parameter
074:             * set and user-provided source of randomness.
075:             *
076:             * <p>This concrete method has been added to this previously-defined
077:             * abstract class. (For backwards compatibility, it cannot be abstract.)
078:             * It may be overridden by a provider to initialize the key pair 
079:             * generator. Such an override
080:             * is expected to throw an InvalidAlgorithmParameterException if
081:             * a parameter is inappropriate for this key pair generator.
082:             * If this method is not overridden, it always throws an
083:             * UnsupportedOperationException.
084:             *
085:             * @param params the parameter set used to generate the keys.
086:             *
087:             * @param random the source of randomness for this generator.
088:             *
089:             * @exception InvalidAlgorithmParameterException if the given parameters
090:             * are inappropriate for this key pair generator.
091:             *
092:             * @since 1.2
093:             */
094:            public void initialize(AlgorithmParameterSpec params,
095:                    SecureRandom random)
096:                    throws InvalidAlgorithmParameterException {
097:                throw new UnsupportedOperationException();
098:            }
099:
100:            /**
101:             * Generates a key pair. Unless an initialization method is called
102:             * using a KeyPairGenerator interface, algorithm-specific defaults
103:             * will be used. This will generate a new key pair every time it
104:             * is called.
105:             *
106:             * @return the newly generated <tt>KeyPair</tt>
107:             */
108:            public abstract KeyPair generateKeyPair();
109:        }
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