Android Key Create getCipherFromPassphrase(String passphrase, byte[] salt, int opMode)

Description

get Cipher From Passphrase

License

Open Source License

Declaration

private static Cipher getCipherFromPassphrase(String passphrase,
            byte[] salt, int opMode) throws GeneralSecurityException 

Method Source Code

//package com.java2s;
/** // w w  w .  ja v a2 s.  c o m
 * Copyright (C) 2011 Whisper Systems
 * 
 * This program 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.
 *
 * 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 for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

import java.security.GeneralSecurityException;

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 Cipher getCipherFromPassphrase(String passphrase,
            byte[] salt, int opMode) throws GeneralSecurityException {
        SecretKey key = getKeyFromPassphrase(passphrase, salt);
        Cipher cipher = Cipher.getInstance(key.getAlgorithm());
        cipher.init(opMode, key, new PBEParameterSpec(salt, 100));

        return cipher;
    }

    private static SecretKey getKeyFromPassphrase(String passphrase,
            byte[] salt) throws GeneralSecurityException {
        PBEKeySpec keyspec = new PBEKeySpec(passphrase.toCharArray(), salt,
                100);
        SecretKeyFactory skf = SecretKeyFactory
                .getInstance("PBEWITHSHA1AND128BITAES-CBC-BC");
        return skf.generateSecret(keyspec);
    }
}

Related

1. createDESedeKeySpec(SecretKey key)
2. createSecretKey(byte[] rawkey)
3. generatePBEKey(char[] password, byte[] salt, String algorthm, int iterations, int keyLength)
4. generateSymmetricKey()
5. getCipherFromPassphrase(String passphrase, byte[] salt, int iterations, int opMode)
6. getMacForPassphrase(String passphrase, byte[] salt)
7. getMacForPassphrase(String passphrase, byte[] salt, int iterations)
8. katakanaToHiragana(byte[] b)