Android AES Key Get getRawKey(byte[] seed)

Description

get Raw Key

Declaration

private static byte[] getRawKey(byte[] seed) throws Exception 

Method Source Code

//package com.java2s;
import java.security.SecureRandom;

import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;

import android.os.Build;

public class Main {
    private static byte[] getRawKey(byte[] seed) throws Exception {
        KeyGenerator kgen = KeyGenerator.getInstance("AES");
        SecureRandom sr = null;/*w  ww.  ja v  a 2  s .  c  o  m*/
        if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            sr = SecureRandom.getInstance("SHA1PRNG", "Crypto");
        } else if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
            sr = SecureRandom.getInstance("SHA1PRNG", "Crypto");
        } else {
            sr = SecureRandom.getInstance("SHA1PRNG");
        }
        sr.setSeed(seed);
        kgen.init(256, sr); //256 bits or 128 bits,192bits  
        SecretKey skey = kgen.generateKey();
        byte[] raw = skey.getEncoded();
        return raw;
    }
}

Related

1. getKeyBytes(String key)
2. getRawKey(String key)
3. getRawKey(byte[] seed)
4. getRawKey(byte[] seed)
5. getRawKey(byte[] seed)
6. getRawKey(byte[] seed)
7. getRawKey(byte[] seed)
8. getSecretKey(String key)
9. initSecretKey()