1 /* 2 * Created on 13 Jun 2006 3 * Created by Paul Gardner 4 * Copyright (C) Azureus Software, Inc, All Rights Reserved. 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 2 9 * of the License, or (at your option) any later version. 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write to the Free Software 16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 17 * 18 */ 19 20 package org.gudy.azureus2.core3.util; 21 22 import java.io.BufferedInputStream; 23 import java.io.ByteArrayOutputStream; 24 import java.io.File; 25 import java.io.FileInputStream; 26 import java.math.BigInteger; 27 import java.security.KeyFactory; 28 import java.security.Signature; 29 import java.security.interfaces.RSAPublicKey; 30 import java.security.spec.RSAPublicKeySpec; 31 import java.util.zip.ZipEntry; 32 import java.util.zip.ZipInputStream; 33 34 35 public class 36 AEVerifier 37 { 38 private static final String pub_exp = "10001"; 39 private static final String modulus = "9a68296f49bf47b2a83ae4ba3cdb5a840a2689e5b36a6f2bfc27b916fc4dc9437f9087c4f0b5ae2fc5127a901b3c048753aa63d29cd7f9da7c81d475380de68236bd919230b0074aa6f40f29a78ac4a14e84fb8946cbcb5a840d1c2f77d83c795c289e37135843b8da008e082654a83b8bd3341b9f2ff6064e20b6c7ba89a707a1f3e1d8b2e0035dae539b04e49775eba23e5cbe89e22290da6c84ec3f450d07"; 40 41 public static void verifyData( File file )42 verifyData( 43 File file ) 44 45 throws AEVerifierException, Exception 46 { 47 KeyFactory key_factory = KeyFactory.getInstance("RSA"); 48 49 RSAPublicKeySpec public_key_spec = 50 new RSAPublicKeySpec( new BigInteger(modulus,16), new BigInteger(pub_exp,16)); 51 52 RSAPublicKey public_key = (RSAPublicKey)key_factory.generatePublic( public_key_spec ); 53 54 verifyData( file, public_key ); 55 } 56 57 protected static void verifyData( File file, RSAPublicKey key )58 verifyData( 59 File file, 60 RSAPublicKey key ) 61 62 throws AEVerifierException, Exception 63 { 64 ZipInputStream zis = null; 65 66 try{ 67 zis = new ZipInputStream( 68 new BufferedInputStream( new FileInputStream( file ) )); 69 70 byte[] signature = null; 71 72 Signature sig = Signature.getInstance("MD5withRSA" ); 73 74 sig.initVerify( key ); 75 76 while( true ){ 77 78 ZipEntry entry = zis.getNextEntry(); 79 80 if ( entry == null ){ 81 82 break; 83 } 84 85 if ( entry.isDirectory()){ 86 87 continue; 88 } 89 90 String name = entry.getName(); 91 92 ByteArrayOutputStream output = null; 93 94 if ( name.equalsIgnoreCase("azureus.sig")){ 95 96 output = new ByteArrayOutputStream(); 97 } 98 99 byte[] buffer = new byte[65536]; 100 101 while( true ){ 102 103 int len = zis.read( buffer ); 104 105 if ( len <= 0 ){ 106 107 break; 108 } 109 110 if ( output == null ){ 111 112 sig.update( buffer, 0, len ); 113 114 }else{ 115 116 output.write( buffer, 0, len ); 117 } 118 } 119 120 if ( output != null ){ 121 122 signature = output.toByteArray(); 123 } 124 } 125 126 if ( signature == null ){ 127 128 throw( new AEVerifierException( AEVerifierException.FT_SIGNATURE_MISSING, "Signature missing from file" )); 129 } 130 131 if ( !sig.verify( signature )){ 132 133 throw( new AEVerifierException( AEVerifierException.FT_SIGNATURE_BAD, "Signature doesn't match data" )); 134 } 135 }finally{ 136 137 if ( zis != null ){ 138 139 zis.close(); 140 } 141 } 142 } 143 144 public static void verifyData( String data, byte[] signature )145 verifyData( 146 String data, 147 byte[] signature ) 148 149 throws AEVerifierException, Exception 150 { 151 KeyFactory key_factory = KeyFactory.getInstance("RSA"); 152 153 RSAPublicKeySpec public_key_spec = 154 new RSAPublicKeySpec( new BigInteger(modulus,16), new BigInteger(pub_exp,16)); 155 156 RSAPublicKey public_key = (RSAPublicKey)key_factory.generatePublic( public_key_spec ); 157 158 Signature sig = Signature.getInstance("MD5withRSA" ); 159 160 sig.initVerify( public_key ); 161 162 sig.update( data.getBytes( "UTF-8" )); 163 164 if ( !sig.verify( signature )){ 165 166 throw( new AEVerifierException( AEVerifierException.FT_SIGNATURE_BAD, "Data verification failed, signature doesn't match data" )); 167 } 168 } 169 } 170