Java SHA1 sha1(final File file)

Description

sha

License

Open Source License

Declaration

public static String sha1(final File file) throws NoSuchAlgorithmException, IOException 

Method Source Code

//package com.java2s;
/**********/*from www.  j a v  a2s.  c om*/
Copyright ? 2013-2014 Olanto Foundation Geneva
    
   This file is part of myTERM.
    
   myCAT is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of
the License, or (at your option) any later version.
    
myCAT 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 Affero General Public License for more details.
    
You should have received a copy of the GNU Affero General Public License
along with myCAT.  If not, see <http://www.gnu.org/licenses/>.
    
**********/

import java.io.BufferedInputStream;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Formatter;

public class Main {
    public static String sha1(final File file) throws NoSuchAlgorithmException, IOException {
        final MessageDigest messageDigest = MessageDigest.getInstance("SHA1");

        try (InputStream is = new BufferedInputStream(new FileInputStream(file))) {
            final byte[] buffer = new byte[1024];
            for (int read = 0; (read = is.read(buffer)) != -1;) {
                messageDigest.update(buffer, 0, read);
            }
        }

        return sha12String(messageDigest);

    }

    public static String sha1(String content) throws NoSuchAlgorithmException, IOException {
        final MessageDigest messageDigest = MessageDigest.getInstance("SHA1");

        try (InputStream is = new ByteArrayInputStream(content.getBytes("UTF-8"))) {
            final byte[] buffer = new byte[1024];
            for (int read = 0; (read = is.read(buffer)) != -1;) {
                messageDigest.update(buffer, 0, read);
            }
        }

        return sha12String(messageDigest);

    }

    public static String sha12String(MessageDigest messageDigest) {
        // Conversion des bytes en   format hex
        try (Formatter formatter = new Formatter()) {
            for (final byte b : messageDigest.digest()) {
                formatter.format("%02x", b);
            }
            return formatter.toString();
        }
    }
}

Related

1. sha1(File f)
2. sha1(File file)
3. sha1(File file)
4. sha1(File sourceFile)
5. sha1(final byte[] bytes)
6. sha1(final String data)
7. sha1(final String str)
8. sha1(final String string)
9. SHA1(final String text)