Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

import java.security.Key;

import java.security.PublicKey;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

import android.util.Base64;

public class Main {
    public static PublicKey publicKey = null;

    public static String encryption(String string) throws Exception {
        // TODO Auto-generated method stub

        //generate symmetric key
        KeyGenerator keygt = KeyGenerator.getInstance("AES");
        keygt.init(128);
        SecretKey symkey = keygt.generateKey();

        //get it encoded
        byte[] aes_ba = symkey.getEncoded();

        //create cipher
        SecretKeySpec skeySpec = new SecretKeySpec(aes_ba, "AES");
        Cipher cipher = Cipher.getInstance("AES");
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec);

        //encryption
        byte[] EncSymbyteArray = cipher.doFinal(string.getBytes());

        //encrypt symKey with PublicKey
        //        Key pubKey = getPublicKey();

        Key pubKey = publicKey;

        //RSA cipher
        Cipher cipherAsm = Cipher.getInstance("RSA", "BC");
        cipherAsm.init(Cipher.ENCRYPT_MODE, pubKey);

        //RSA encryption
        byte[] asymEncsymKey = cipherAsm.doFinal(aes_ba);

        //           File f3 = new File(BASE_PATH,"enc.txt");
        //           File f3key = new File(BASE_PATH,"enckey.txt");
        //           File f3file = new File(BASE_PATH,"encfile.txt");
        //           writeToFile2(f3,f3key,f3file, asymEncsymKey, EncSymbyteArray);

        //byte != new String
        //return new String(byteMerger(asymEncsymKey, EncSymbyteArray));
        return Base64.encodeToString(byteMerger(asymEncsymKey, EncSymbyteArray), Base64.DEFAULT);

    }

    public static byte[] byteMerger(byte[] byte_1, byte[] byte_2) {
        byte[] byte_3 = new byte[byte_1.length + byte_2.length];
        System.arraycopy(byte_1, 0, byte_3, 0, byte_1.length);
        System.arraycopy(byte_2, 0, byte_3, byte_1.length, byte_2.length);
        return byte_3;
    }
}