SHA1Helper.java

/**
 * This file is part of CrashCatcher library.
 * Copyright (c) 2014, Sibext Ltd. (http://www.sibext.com), 
 * All rights reserved.
 * 
 * This library 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 3.0 of the License, or (at your option) any later version.
 * 
 * This library 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 Lesser General Public License 
 * for more details (http://www.gnu.org/licenses/lgpl-3.0.txt).
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library.
 */

package com.sibext.android.tools;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class SHA1Helper {

    private static String convertToHex(byte[] data) {
        StringBuilder buf = new StringBuilder();
        for (byte b : data) {
            int halfbyte = (b >>> 4) & 0x0F;
            int two_halfs = 0;
            do {
                buf.append((0 <= halfbyte) && (halfbyte <= 9) ? (char) ('0' + halfbyte) : (char) ('a' + (halfbyte - 10)));
                halfbyte = b & 0x0F;
            } while (two_halfs++ < 1);
        }
        return buf.toString();
    }

    public static String getSHA1(String text) {
        MessageDigest md;
        try {
            md = MessageDigest.getInstance("SHA-1");
            md.update(text.getBytes("iso-8859-1"), 0, text.length());
            byte[] sha1hash = md.digest();
            return convertToHex(sha1hash);
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return null;
    }
}