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1: /* CSPRNGSpi.java -- 2: Copyright (C) 2004, 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.IRandom; 42: import gnu.java.security.prng.LimitReachedException; 43: import gnu.javax.crypto.prng.CSPRNG; 44: 45: import java.net.MalformedURLException; 46: import java.security.SecureRandomSpi; 47: 48: /** 49: * The implementation of the continuously-seeded SecureRandom <i>Service 50: * Provider Interface</i> (<b>SPI</b>) adapter. 51: */ 52: public class CSPRNGSpi 53: extends SecureRandomSpi 54: { 55: private final IRandom adaptee; 56: 57: public CSPRNGSpi() throws ClassNotFoundException, MalformedURLException, 58: NumberFormatException 59: { 60: super(); 61: 62: adaptee = CSPRNG.getSystemInstance(); 63: } 64: 65: protected byte[] engineGenerateSeed(final int count) 66: { 67: if (count < 0) 68: throw new IllegalArgumentException("count must be nonnegative"); 69: byte[] buf = new byte[count]; 70: if (count == 0) 71: return buf; 72: engineNextBytes(buf); 73: return buf; 74: } 75: 76: protected void engineNextBytes(final byte[] buffer) 77: { 78: if (buffer == null) 79: throw new NullPointerException(); 80: try 81: { 82: adaptee.nextBytes(buffer, 0, buffer.length); 83: } 84: catch (LimitReachedException lre) 85: { 86: throw new RuntimeException("random-number generator has been exhausted"); 87: } 88: } 89: 90: protected void engineSetSeed(final byte[] seed) 91: { 92: if (seed == null) 93: throw new NullPointerException(); 94: adaptee.addRandomBytes(seed, 0, seed.length); 95: } 96: }