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1: /* Random.java -- SSL Random structure. 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.net.ssl.provider; 40: 41: import java.io.ByteArrayOutputStream; 42: import java.io.InputStream; 43: import java.io.IOException; 44: import java.io.OutputStream; 45: import java.io.PrintWriter; 46: import java.io.StringWriter; 47: 48: import java.nio.ByteBuffer; 49: import java.nio.ByteOrder; 50: 51: /** 52: * An SSL nonce. 53: * 54: * <pre> 55: struct 56: { 57: uint32 gmt_unix_time; 58: opaque random_bytes[28]; 59: } Random; 60: */ 61: public class Random implements Builder, Constructed 62: { 63: 64: // Fields. 65: // ------------------------------------------------------------------------- 66: 67: static final int RANDOM_LENGTH = 28; 68: 69: private final ByteBuffer buffer; 70: 71: // Constructors. 72: // ------------------------------------------------------------------------- 73: 74: public Random (final ByteBuffer buffer) 75: { 76: this.buffer = buffer.duplicate().order(ByteOrder.BIG_ENDIAN); 77: } 78: 79: public Random copy() 80: { 81: ByteBuffer buffer = ByteBuffer.allocate(32); 82: buffer.put((ByteBuffer) this.buffer.duplicate().position(0)); 83: return new Random(buffer); 84: } 85: 86: public int length() 87: { 88: return RANDOM_LENGTH + 4; 89: } 90: 91: public ByteBuffer buffer() 92: { 93: return ((ByteBuffer) buffer.duplicate().position(0).limit(length())).slice(); 94: } 95: 96: public int gmtUnixTime () 97: { 98: return buffer.getInt(0); 99: } 100: 101: public byte[] randomBytes() 102: { 103: byte[] buf = new byte[28]; 104: buffer.position (4); 105: buffer.get (buf); 106: return buf; 107: } 108: 109: public void setGmtUnixTime (final int gmtUnixTime) 110: { 111: buffer.putInt (0, gmtUnixTime); 112: } 113: 114: public void setRandomBytes (final byte[] randomBytes) 115: { 116: setRandomBytes (randomBytes, 0); 117: } 118: 119: public void setRandomBytes (final byte[] randomBytes, final int offset) 120: { 121: if (randomBytes.length - offset < RANDOM_LENGTH) 122: throw new IllegalArgumentException ("random value too short"); 123: buffer.position (4); 124: buffer.put (randomBytes, offset, RANDOM_LENGTH); 125: } 126: 127: public String toString (final String prefix) 128: { 129: StringWriter str = new StringWriter(); 130: PrintWriter out = new PrintWriter(str); 131: if (prefix != null) 132: out.print (prefix); 133: out.println("struct {"); 134: if (prefix != null) 135: out.print (prefix); 136: out.print (" gmt_unix_time: "); 137: out.print (gmtUnixTime ()); 138: out.println (";"); 139: if (prefix != null) 140: out.print (prefix); 141: out.print (" random_bytes: "); 142: out.print (Util.toHexString (randomBytes (), ':')); 143: out.println (";"); 144: if (prefix != null) 145: out.print (prefix); 146: out.print ("} Random;"); 147: return str.toString(); 148: } 149: 150: public String toString () 151: { 152: return toString (null); 153: } 154: }