Java Key Public getPublicKey(String filename)

Description

get Public Key

License

Apache License

Declaration

public static PublicKey getPublicKey(String filename) throws Exception 

Method Source Code

//package com.java2s;
/**// w  w  w  . ja  va 2s .  co m
 * Copyright (C) 2011-2018 Red Hat, Inc. (https://github.com/Commonjava/indy)
 *
 * 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.nio.file.Files;
import java.nio.file.Paths;

import java.security.KeyFactory;

import java.security.PublicKey;

import java.security.spec.X509EncodedKeySpec;

public class Main {
    public static final String KEY_TYPE_RSA = "RSA";

    public static PublicKey getPublicKey(String filename) throws Exception {
        byte[] keyBytes = Files.readAllBytes(Paths.get(filename));

        X509EncodedKeySpec spec = new X509EncodedKeySpec(keyBytes);
        KeyFactory kf = KeyFactory.getInstance(KEY_TYPE_RSA);
        return kf.generatePublic(spec);
    }
}

Related

1. getPublicKey(KeyStore ks, String alias, char[] password)
2. getPublicKey(String algo)
3. getPublicKey(String alias)
4. getPublicKey(String certificatePath)
5. getPublicKey(String certPath)
6. getPublicKey(String filename)
7. getPublicKey(String filename)
8. getPublicKey(String key)
9. getPublicKey(String modulus, String exponent)