Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * 
 * Copyright (C) 2015 Orange Labs
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *    http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 */

import java.math.BigInteger;

import java.security.KeyFactory;

import java.security.interfaces.RSAPrivateKey;

import java.security.spec.RSAPrivateKeySpec;

import org.json.JSONObject;
import android.util.Base64;

public class Main {
    public static RSAPrivateKey privKeyFromJwk(String jwkp) {
        RSAPrivateKey privKey = null;

        try {
            JSONObject jk = new JSONObject(jwkp).getJSONArray("keys").getJSONObject(0);

            BigInteger n = new BigInteger(1, decodeB64(jk.getString("n")));
            BigInteger d = new BigInteger(1, decodeB64(jk.getString("d")));

            RSAPrivateKeySpec privRsaSpec = new RSAPrivateKeySpec(n, d);
            KeyFactory keyfact = KeyFactory.getInstance("RSA", "SC");
            privKey = (RSAPrivateKey) keyfact.generatePrivate(privRsaSpec);
        } catch (Exception e) {
            e.printStackTrace();
        }

        return privKey;
    }

    static byte[] decodeB64(String s64) {
        return Base64.decode(s64, Base64.URL_SAFE);
    }
}