decrypt using PBE With MD5 And DES - Android java.security

Android examples for java.security:DES

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Description

decrypt using PBE With MD5 And DES

Demo Code

/**/*from  ww w  .  j  av a 2s .  c om*/
 *   This file is part of TuCan Mobile.
 *
 *   TuCan Mobile is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   TuCan Mobile 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 General Public License
 *   along with TuCan Mobile.  If not, see <http://www.gnu.org/licenses/>.
 */
//package com.java2s;
import android.os.Build;
import android.util.Base64;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;

public class Main {
    private static final byte[] SALT = { (byte) 0xde, (byte) 0x33,
            (byte) 0x10, (byte) 0x12, (byte) 0xde, (byte) 0x33,
            (byte) 0x10, (byte) 0x12, };
    private static final String SALT2 = "TUCewqwertr1233dt1337";

    public static String decrypt(String cryptedString) {
        if (cryptedString == null || cryptedString.equals(""))
            return "";

        try {
            SecretKeyFactory keyFactory = SecretKeyFactory
                    .getInstance("PBEWithMD5AndDES");
            SecretKey key = keyFactory.generateSecret(new PBEKeySpec(SALT2
                    .toCharArray()));
            Cipher pbeCipher = Cipher.getInstance("PBEWithMD5AndDES");
            pbeCipher.init(Cipher.DECRYPT_MODE, key, new PBEParameterSpec(
                    SALT, 20));
            return new String(
                    pbeCipher.doFinal(base64Decode(cryptedString)), "UTF-8");
        } catch (Exception e) {
            throw new RuntimeException("failed to decrypt", e);
        }
    }

    private static byte[] base64Decode(String string) {
        // TODO implement me for api 7
        if (Build.VERSION.SDK_INT > 7)
            return Base64.decode(string, Base64.DEFAULT);
        else
            return string.getBytes();
    }
}

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