base/runtime/org.argeo.util/src/main/java/org/argeo/util/security/DigestUtils.java

   1 /*
   2  * Copyright (C) 2007-2012 Mathieu Baudier
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *         http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package org.argeo.util.security;
  17
  18 import java.io.File;
  19 import java.io.FileInputStream;
  20 import java.io.IOException;
  21 import java.io.InputStream;
  22 import java.nio.ByteBuffer;
  23 import java.nio.channels.FileChannel;
  24 import java.security.MessageDigest;
  25 import java.security.NoSuchAlgorithmException;
  26
  27 import org.argeo.ArgeoException;
  28 import org.argeo.StreamUtils;
  29
  30 /** Utilities around cryptographic digests */
  31 public class DigestUtils {
  32         private static Boolean debug = true;
  33         // TODO: make it writable
  34         private final static Integer byteBufferCapacity = 100 * 1024;// 100 KB
  35
  36         public static String digest(String algorithm, InputStream in) {
  37                 try {
  38                         MessageDigest digest = MessageDigest.getInstance(algorithm);
  39                         // ReadableByteChannel channel = Channels.newChannel(in);
  40                         // ByteBuffer bb = ByteBuffer.allocateDirect(byteBufferCapacity);
  41                         // while (channel.read(bb) > 0)
  42                         // digest.update(bb);
  43                         byte[] buffer = new byte[byteBufferCapacity];
  44                         int read = 0;
  45                         while ((read = in.read(buffer)) > 0) {
  46                                 digest.update(buffer, 0, read);
  47                         }
  48
  49                         byte[] checksum = digest.digest();
  50                         String res = StreamUtils.encodeHexString(checksum);
  51                         return res;
  52                 } catch (Exception e) {
  53                         throw new ArgeoException("Cannot digest with algorithm "
  54                                         + algorithm, e);
  55                 } finally {
  56                         StreamUtils.closeQuietly(in);
  57                 }
  58         }
  59
  60         public static String digest(String algorithm, File file) {
  61                 FileInputStream fis = null;
  62                 FileChannel fc = null;
  63                 try {
  64                         fis = new FileInputStream(file);
  65                         fc = fis.getChannel();
  66
  67                         // Get the file's size and then map it into memory
  68                         int sz = (int) fc.size();
  69                         ByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0, sz);
  70                         return digest(algorithm, bb);
  71                 } catch (IOException e) {
  72                         throw new ArgeoException("Cannot digest " + file
  73                                         + " with algorithm " + algorithm, e);
  74                 } finally {
  75                         StreamUtils.closeQuietly(fis);
  76                         if (fc.isOpen())
  77                                 try {
  78                                         fc.close();
  79                                 } catch (IOException e) {
  80                                         // silent
  81                                 }
  82                 }
  83         }
  84
  85         protected static String digest(String algorithm, ByteBuffer bb) {
  86                 long begin = System.currentTimeMillis();
  87                 try {
  88                         MessageDigest digest = MessageDigest.getInstance(algorithm);
  89                         digest.update(bb);
  90                         byte[] checksum = digest.digest();
  91                         String res = StreamUtils.encodeHexString(checksum);
  92                         long end = System.currentTimeMillis();
  93                         if (debug)
  94                                 System.out.println((end - begin) + " ms / "
  95                                                 + ((end - begin) / 1000) + " s");
  96                         return res;
  97                 } catch (NoSuchAlgorithmException e) {
  98                         throw new ArgeoException("Cannot digest with algorithm "
  99                                         + algorithm, e);
 100                 }
 101         }
 102
 103         public static void main(String[] args) {
 104                 File file;
 105                 if (args.length > 0)
 106                         file = new File(args[0]);
 107                 else {
 108                         System.err.println("Usage: <file> [<algorithm>]"
 109                                         + " (see http://java.sun.com/j2se/1.5.0/"
 110                                         + "docs/guide/security/CryptoSpec.html#AppA)");
 111                         return;
 112                 }
 113
 114                 if (args.length > 1) {
 115                         String algorithm = args[1];
 116                         System.out.println(digest(algorithm, file));
 117                 } else {
 118                         String algorithm = "MD5";
 119                         System.out.println(algorithm + ": " + digest(algorithm, file));
 120                         algorithm = "SHA";
 121                         System.out.println(algorithm + ": " + digest(algorithm, file));
 122                         algorithm = "SHA-256";
 123                         System.out.println(algorithm + ": " + digest(algorithm, file));
 124                         algorithm = "SHA-512";
 125                         System.out.println(algorithm + ": " + digest(algorithm, file));
 126                 }
 127         }
 128
 129 }