Java SHA256 sha256encrypt(String phrase)

Description

shaencrypt

License

Open Source License

Declaration

public static String sha256encrypt(String phrase)
            throws NoSuchAlgorithmException 

Method Source Code

//package com.java2s;
/*//  w ww  .ja  v  a  2s .  c  om
 Copyright Julia Hippisley-Cox, University of Nottingham 2011 
    
 This file is part of the OpenPseudonymiser CryptoLib
    
 OpenPseudonymiser CryptoLib is free software: you can redistribute it and/or modify
 it under the terms of the GNU Lesser General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.

 OpenPseudonymiser CryptoLib 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 for more details.

 You should have received a copy of the GNU Lesser General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
    
 For more information about this project, see  http://www.openpseudonymiser.org 
 * 
 *     This software is issued under the GNU General Public License. The university
 has made reasonable enquiries regarding granted and pending patent
 applications in the general area of this technology and is not aware of any
 granted or pending patent in Europe which restricts the use of this
 software. In the event that the university receives a notice of perceived patent
 infringement, then the university will inform users that their use of the
 software may need to or, if appropriate, must cease in the appropriate
 territory. The university does not make any warranties in this respect and each
 user shall be solely responsible for ensuring that they do not infringe any
 third party patent.
    
 */

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Main {
    public static String sha256encrypt(String phrase)
            throws NoSuchAlgorithmException {
        return generateHash(phrase, "SHA-256");
    }

    private static String generateHash(String plainText, String hashType)
            throws NoSuchAlgorithmException {
        MessageDigest md = MessageDigest.getInstance(hashType); // SHA or MD5

        byte[] data = plainText.getBytes();

        md.update(data); // Reads it all at one go. Might be better to chunk it.

        byte[] digest = md.digest();

        return byteArrayToString(digest).toUpperCase();
    }

    public static String byteArrayToString(byte[] inputArray) {
        String output = "";

        for (int i = 0; i < inputArray.length; i++) {
            String hex = Integer.toHexString(inputArray[i]);
            if (hex.length() == 1)
                hex = "0" + hex;
            hex = hex.substring(hex.length() - 2);
            output += hex;
        }

        return output;
    }
}

Related

1. SHA256byte(String input)
2. sha256digest(@Nonnull byte[] data)
3. sha256Digest(byte[] bytes)
4. sha256Digest(final InputStream data)
5. sha256Encode(String message)
6. sha256Hash()
7. sha256Hash(byte[] data)
8. sha256Hash(File file)
9. sha256Hash(final String tohash)