Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
import java.math.BigInteger;

import java.security.spec.RSAPrivateKeySpec;

import android.content.Context;
import android.content.SharedPreferences;
import android.util.Base64;
import android.util.Log;

public class Main {
    private static final String TAG = "MyKeyUtils";
    public static final String PREFS_MY_KEYS = "MyKeys";
    public static final String PREF_PRIVATE_MOD = "PrivateModulus";
    public static final String PREF_PRIVATE_EXP = "PrivateExponent";

    public static void savePrivateKey(RSAPrivateKeySpec privateKey, Context context) {
        BigInteger privateModBI = privateKey.getModulus();
        BigInteger privateExpBI = privateKey.getPrivateExponent();

        byte[] privateModBA = privateModBI.toByteArray();// Base64.encodeInteger(pubModBI);
        // // for some
        // strange reason
        // this throws
        // NoSuchMethodError
        byte[] privateExpBA = privateExpBI.toByteArray();// Base64.encodeInteger(pubExpBI);

        try {
            String privateModBase64Str = Base64.encodeToString(privateModBA, Base64.NO_WRAP);
            String privateExpBase64Str = Base64.encodeToString(privateExpBA, Base64.NO_WRAP);
            savePrivateKey(privateModBase64Str, privateExpBase64Str, context);

        } catch (NoSuchMethodError e) {
            Log.e(TAG, "Base64.encode() method not available", e);
        }
    }

    private static void savePrivateKey(String mod, String exp, Context context) {
        SharedPreferences prefs = context.getSharedPreferences(PREFS_MY_KEYS, Context.MODE_PRIVATE);
        SharedPreferences.Editor prefsEditor = prefs.edit();

        prefsEditor.putString(PREF_PRIVATE_MOD, mod);
        prefsEditor.putString(PREF_PRIVATE_EXP, exp);
        // prefsEditor.putString(PREF_PRIVATE_MOD, DEFAULT_PRIVATE_MOD);
        prefsEditor.commit();
    }
}