get AES Key from password - Java Security

Java examples for Security:AES

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Description

get AES Key from password

Demo Code


//package com.java2s;

import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.Base64;

import javax.crypto.KeyGenerator;

import javax.crypto.SecretKey;

public class Main {
    public static void main(String[] argv) throws Exception {
        String pwd = "java2s.com";
        System.out.println(getKey(pwd));
    }// w ww. j  a v a 2 s .  co m

    private static final String KEY_ALGORITHM = "AES";

     static String getKey(String pwd) {
        try {
            KeyGenerator kgen = KeyGenerator.getInstance("AES");
            SecureRandom sr = new SecureRandom();
            sr.setSeed(pwd.getBytes());
            kgen.init(128, sr);

            System.out.println("genkey1: "
                    + Base64.getEncoder().encodeToString(
                            kgen.generateKey().getEncoded()));
            System.out.println("genkey2: "
                    + Base64.getEncoder().encodeToString(
                            kgen.generateKey().getEncoded()));
            System.out.println("genkey3: "
                    + Base64.getEncoder().encodeToString(
                            kgen.generateKey().getEncoded()));

            return Base64.getEncoder().encodeToString(
                    kgen.generateKey().getEncoded());
        } catch (NoSuchAlgorithmException e) {

            // TODO Auto-generated catch block
            e.printStackTrace();

        }
        return "";

    }

    private static SecretKey generateKey(String pwd)
            throws NoSuchAlgorithmException {
        KeyGenerator kgen = KeyGenerator.getInstance(KEY_ALGORITHM);
        kgen.init(128, new SecureRandom(pwd.getBytes()));
        SecretKey secretKey = kgen.generateKey();
        return secretKey;
    }
}

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