Source Code Cross Referenced for KeyFactory.java in  » Database-DBMS » Quadcap-Embeddable-Database » com » quadcap » crypto » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » Quadcap Embeddable Database » com.quadcap.crypto 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package com.quadcap.crypto;
002:
003:        /* Copyright 2002 - 2003 Quadcap Software.  All rights reserved.
004:         *
005:         * This software is distributed under the Quadcap Free Software License.
006:         * This software may be used or modified for any purpose, personal or
007:         * commercial.  Open Source redistributions are permitted.  Commercial
008:         * redistribution of larger works derived from, or works which bundle
009:         * this software requires a "Commercial Redistribution License"; see
010:         * http://www.quadcap.com/purchase.
011:         *
012:         * Redistributions qualify as "Open Source" under  one of the following terms:
013:         *   
014:         *    Redistributions are made at no charge beyond the reasonable cost of
015:         *    materials and delivery.
016:         *
017:         *    Redistributions are accompanied by a copy of the Source Code or by an
018:         *    irrevocable offer to provide a copy of the Source Code for up to three
019:         *    years at the cost of materials and delivery.  Such redistributions
020:         *    must allow further use, modification, and redistribution of the Source
021:         *    Code under substantially the same terms as this license.
022:         *
023:         * Redistributions of source code must retain the copyright notices as they
024:         * appear in each source code file, these license terms, and the
025:         * disclaimer/limitation of liability set forth as paragraph 6 below.
026:         *
027:         * Redistributions in binary form must reproduce this Copyright Notice,
028:         * these license terms, and the disclaimer/limitation of liability set
029:         * forth as paragraph 6 below, in the documentation and/or other materials
030:         * provided with the distribution.
031:         *
032:         * The Software is provided on an "AS IS" basis.  No warranty is
033:         * provided that the Software is free of defects, or fit for a
034:         * particular purpose.  
035:         *
036:         * Limitation of Liability. Quadcap Software shall not be liable
037:         * for any damages suffered by the Licensee or any third party resulting
038:         * from use of the Software.
039:         */
040:
041:        import java.util.Random;
042:
043:        /**
044:         * A simple key factory to localize the (hardcoded) choice of ciphers.
045:         *
046:         * @author Stan Bailes
047:         */
048:        public class KeyFactory {
049:            /**
050:             * Create a symmetric key using the specified random number generator
051:             * and the default symmetric key algorithm
052:             */
053:            public static SymmetricKey createSymmetricKey(Random r) {
054:                SymmetricKey k = new Tea();
055:                k.init(r);
056:                return k;
057:            }
058:
059:            /**
060:             * Create a symmetric key seeded with the specified pass phrase
061:             * This fellow creates a Rijndael 128 bit key
062:             */
063:            public static SymmetricKey createSymmetricKey(String passphrase) {
064:                return createSymmetricKey("aes:128", passphrase);
065:            }
066:
067:            /**
068:             * Make the passphrase into a fixed size byte array with smearing
069:             */
070:            public static byte[] bytesFromPassphrase(int len, String passphrase) {
071:                byte[] key = new byte[len];
072:                long seed = 13 * passphrase.length();
073:                for (int i = 0; i < key.length; i++) {
074:                    int c = passphrase.charAt(i % passphrase.length());
075:                    seed += (c << 18) ^ c;
076:                    seed = (seed * 0x5DEECE66DL + 0xBL) & ((1L << 48) - 1);
077:                    key[i] = (byte) ((seed >> 5) & 0xff);
078:                }
079:                return key;
080:            }
081:
082:            /**
083:             * Create a symmetric key from an algorithm specification and a pass
084:             * phrase.
085:             *
086:             */
087:            public static SymmetricKey createSymmetricKey(String algo,
088:                    String passphrase) {
089:                SymmetricKey k = null;
090:
091:                algo = algo.toLowerCase();
092:                if (algo.startsWith("aes")) {
093:                    int len = 16;
094:                    int idx = algo.indexOf(':');
095:                    if (idx > 0) {
096:                        len = Integer.parseInt(algo.substring(idx + 1)) / 8;
097:                    }
098:                    Rijndael rk = new Rijndael();
099:                    rk.init(bytesFromPassphrase(len, passphrase));
100:                    k = rk;
101:                } else if (algo.startsWith("tea:256")) {
102:                    Tea256 tk = new Tea256();
103:                    tk.init(bytesFromPassphrase(256, passphrase));
104:                    k = tk;
105:                } else if (algo.startsWith("tea:128")) {
106:                    Tea tk = new Tea();
107:                    tk.init(bytesFromPassphrase(128, passphrase));
108:                    k = tk;
109:                }
110:                return k;
111:            }
112:
113:            /**
114:             * Create a public/private key pair and return the private portion
115:             */
116:            public static PrivateKey createPrivateKey(Random r, String alg,
117:                    String name) {
118:                RSAPrivateKey k = new RSAPrivateKey();
119:                k.init(name, 1024, r);
120:                return k;
121:            }
122:
123:            /**
124:             * Restore a symmetric key from its serialized form
125:             */
126:            public static SymmetricKey readSymmetricKey(String s) {
127:                Tea t = new Tea();
128:                t.init(s);
129:                return t;
130:            }
131:
132:            /**
133:             * Restore a public key from its serialized form
134:             */
135:            public static PublicKey readPublicKey(String s) {
136:                RSAPublicKey k = new RSAPublicKey();
137:                k.init(s);
138:                return k;
139:            }
140:
141:            /**
142:             * Restore a private key from its serialized form
143:             */
144:            public static PrivateKey readPrivateKey(String s) {
145:                RSAPrivateKey k = new RSAPrivateKey();
146:                k.init(s);
147:                return k;
148:            }
149:
150:            /**
151:             * Create a digest
152:             */
153:            public static Digest createDigest(String alg) {
154:                return new SHA1Digest();
155:            }
156:
157:            public static Random createRandom(String seed) {
158:                Random r = new java.util.Random();
159:                r.setSeed(System.currentTimeMillis() * 1003 + seed.hashCode());
160:                return r;
161:            }
162:
163:        }
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