/*
* @(#)sha1.java 1.2 06/10/10
*
* Copyright 1990-2008 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 only, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License version 2 for more details (a copy is
* included at /legal/license.txt).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this work; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 or visit www.sun.com if you need additional
* information or have any questions.
*/
/*
* This tool takes a file as the input and computes the hash
* value using SHA-1 cryptographic algorithm for the input
* file. The output is the SHA-1 hash value.
*/
import java.io.*;
import java.security.*;
public class sha1 {
private static final int BUFSIZE = 16*1024; // 16k buffer
public static void main(String[] args) {
try {
MessageDigest sha = MessageDigest.getInstance("SHA-1");
FileInputStream fis = new FileInputStream(args[0]);
byte[] data = new byte[BUFSIZE];
do {
int numread = fis.read(data);
if (numread == -1) {
break;
} else {
sha.update(data, 0, numread);
}
} while (true);
fis.close();
byte[] hash = sha.digest();
System.out.println(stringForm(hash));
} catch (Exception e) {
e.printStackTrace();
}
}
private static String stringForm(byte[] h) {
String s = "";
for (int i = 0; i < h.length; i++) {
String prefix;
int ub = h[i] & 0xff;
if (ub <= 0xf) {
prefix = "0";
} else {
prefix = "";
}
s += prefix + Integer.toHexString(ub);
}
return s;
}
}