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1: /* FortunaImpl.java -- Fortuna SecureRandom adapter. 2: Copyright (C) 2006 Free Software Foundation, Inc. 3: 4: This file is a part of GNU Classpath. 5: 6: GNU Classpath is free software; you can redistribute it and/or modify 7: it under the terms of the GNU General Public License as published by 8: the Free Software Foundation; either version 2 of the License, or (at 9: your option) any later version. 10: 11: GNU Classpath 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 for more details. 15: 16: You should have received a copy of the GNU General Public License 17: along with GNU Classpath; if not, write to the Free Software 18: Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 19: USA 20: 21: Linking this library statically or dynamically with other modules is 22: making a combined work based on this library. Thus, the terms and 23: conditions of the GNU General Public License cover the whole 24: combination. 25: 26: As a special exception, the copyright holders of this library give you 27: permission to link this library with independent modules to produce an 28: executable, regardless of the license terms of these independent 29: modules, and to copy and distribute the resulting executable under 30: terms of your choice, provided that you also meet, for each linked 31: independent module, the terms and conditions of the license of that 32: module. An independent module is a module which is not derived from 33: or based on this library. If you modify this library, you may extend 34: this exception to your version of the library, but you are not 35: obligated to do so. If you do not wish to do so, delete this 36: exception statement from your version. */ 37: 38: 39: package gnu.javax.crypto.jce.prng; 40: 41: import gnu.java.security.prng.LimitReachedException; 42: import gnu.javax.crypto.prng.Fortuna; 43: 44: import java.security.SecureRandomSpi; 45: import java.util.Collections; 46: 47: public final class FortunaImpl 48: extends SecureRandomSpi 49: { 50: private final Fortuna adaptee; 51: 52: public FortunaImpl() 53: { 54: adaptee = new Fortuna(); 55: adaptee.init(Collections.singletonMap(Fortuna.SEED, new byte[0])); 56: } 57: 58: protected void engineSetSeed(byte[] seed) 59: { 60: synchronized (adaptee) 61: { 62: adaptee.addRandomBytes(seed); 63: } 64: } 65: 66: protected void engineNextBytes(byte[] buffer) 67: { 68: synchronized (adaptee) 69: { 70: try 71: { 72: adaptee.nextBytes(buffer); 73: } 74: catch (LimitReachedException shouldNotHappen) 75: { 76: throw new Error(shouldNotHappen); 77: } 78: } 79: } 80: 81: protected byte[] engineGenerateSeed(int numbytes) 82: { 83: byte[] seed = new byte[numbytes]; 84: engineNextBytes(seed); 85: return seed; 86: } 87: }