Android AES Encrypt encrypt(Context context, String text)

Description

encrypt

Declaration

public static String encrypt(Context context, String text)
            throws Exception 

Method Source Code

//package com.java2s;

import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.KeySpec;
import android.content.Context;
import android.content.pm.PackageManager;

import android.util.Base64;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;

public class Main {
    public static String encrypt(Context context, String text)
            throws Exception {
        byte[] message = Base64.encode(text.getBytes(), Base64.DEFAULT);
        SecretKey skeySpec = generateKey(getSeed(context),
                "edu.uoc.esquelet.app".getBytes());
        Cipher cipher = Cipher.getInstance("AES");
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
        byte[] encrypted = cipher.doFinal(message);
        return Base64.encodeToString(encrypted, Base64.DEFAULT);
    }/*ww w. j  av a 2s.  co m*/

    public static SecretKey generateKey(char[] passphraseOrPin, byte[] salt)
            throws NoSuchAlgorithmException, InvalidKeySpecException {

        final int iterations = 1000;

        final int outputKeyLength = 128;

        SecretKeyFactory secretKeyFactory = SecretKeyFactory
                .getInstance("PBKDF2WithHmacSHA1");
        KeySpec keySpec = new PBEKeySpec(passphraseOrPin, salt, iterations,
                outputKeyLength);
        return secretKeyFactory.generateSecret(keySpec);
    }

    private static char[] getSeed(Context context) {
        long installed = 0;
        try {
            installed = context.getPackageManager().getPackageInfo(
                    "edu.uoc.esquelet.app", 0).firstInstallTime;
        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
        }
        return Long.toString(installed).toCharArray();
    }
}

Related

1. encryptUrlEncode(String dataPassword, String cleartext)
2. encryptWithKey(String key, String src)
3. crypt(byte[] text, byte[] key, int mode)
4. aesEncode(String seed, String cleartext)
5. encrypt(byte[] raw, byte[] clear)
6. encrypt(Context context, String text)
7. encryptedData(String userkey, String userData)
8. encryptedPassword(String key, String userData)
9. generateEncryptionSecret()