| package org.apache.maven.it; |
| |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.security.DigestInputStream; |
| import java.security.MessageDigest; |
| |
| /** |
| * @author Benjamin Bentmann |
| */ |
| class ItUtils |
| { |
| |
| public static String calcHash( File file, String algo ) |
| throws Exception |
| { |
| MessageDigest digester = MessageDigest.getInstance( algo ); |
| |
| DigestInputStream dis; |
| try ( FileInputStream is = new FileInputStream( file ) ) |
| { |
| dis = new DigestInputStream( is, digester ); |
| |
| for ( byte[] buffer = new byte[1024 * 4]; dis.read( buffer ) >= 0; ) |
| { |
| // just read it |
| } |
| } |
| |
| byte[] digest = digester.digest(); |
| |
| StringBuilder hash = new StringBuilder( digest.length * 2 ); |
| |
| for ( byte aDigest : digest ) |
| { |
| int b = aDigest & 0xFF; |
| |
| if ( b < 0x10 ) |
| { |
| hash.append( '0' ); |
| } |
| |
| hash.append( Integer.toHexString( b ) ); |
| } |
| |
| return hash.toString(); |
| } |
| |
| } |