Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright (C) 2014 The Android Open Source Project
 *
 * 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.io.File;

import java.io.FileInputStream;

import java.security.PublicKey;
import java.security.KeyFactory;

import java.security.spec.X509EncodedKeySpec;

public class Main {
    static PublicKey loadDERPublicKeyFromFile(String keyFname) throws Exception {
        return loadDERPublicKey(read(keyFname));
    }

    static PublicKey loadDERPublicKey(byte[] der) throws Exception {
        X509EncodedKeySpec publicKeySpec = new X509EncodedKeySpec(der);
        KeyFactory factory = KeyFactory.getInstance("RSA");
        return factory.generatePublic(publicKeySpec);
    }

    static byte[] read(String fname) throws Exception {
        long offset = 0;
        File f = new File(fname);
        long length = f.length();
        byte[] image = new byte[(int) length];
        FileInputStream fis = new FileInputStream(f);
        while (offset < length) {
            offset += fis.read(image, (int) offset, (int) (length - offset));
        }
        fis.close();
        return image;
    }
}