| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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. |
| * |
| */ |
| package org.apache.kerby.kerberos.kerb.common; |
| |
| import java.io.ByteArrayInputStream; |
| import java.io.InputStream; |
| import java.nio.charset.StandardCharsets; |
| import java.security.KeyFactory; |
| import java.security.PublicKey; |
| import java.security.cert.Certificate; |
| import java.security.cert.CertificateFactory; |
| import java.security.spec.InvalidKeySpecException; |
| import java.security.spec.X509EncodedKeySpec; |
| |
| import org.apache.commons.io.IOUtils; |
| import org.apache.kerby.util.Base64; |
| |
| public class PublicKeyReader { |
| |
| public static PublicKey loadPublicKey(InputStream in) throws Exception { |
| byte[] keyBytes = IOUtils.toByteArray(in); |
| |
| try { |
| return loadPublicKey(keyBytes); |
| } catch (InvalidKeySpecException ex) { |
| // It might be a Certificate and not a PublicKey... |
| Certificate cert = |
| CertificateFactory.getInstance("X.509").generateCertificate(new ByteArrayInputStream(keyBytes)); |
| return cert.getPublicKey(); |
| } |
| } |
| |
| |
| public static PublicKey loadPublicKey(byte[] publicKeyBytes) throws Exception { |
| String pubKey = new String(publicKeyBytes, StandardCharsets.UTF_8); |
| if (pubKey.startsWith("-----BEGIN PUBLIC KEY-----")) { |
| // PEM format |
| pubKey = pubKey.replace("-----BEGIN PUBLIC KEY-----", ""); |
| pubKey = pubKey.replace("-----END PUBLIC KEY-----", ""); |
| |
| Base64 base64 = new Base64(); |
| byte[] buffer = base64.decode(pubKey.trim()); |
| |
| KeyFactory keyFactory = KeyFactory.getInstance("RSA"); |
| X509EncodedKeySpec keySpec = new X509EncodedKeySpec(buffer); |
| return keyFactory.generatePublic(keySpec); |
| } else { |
| // DER format |
| KeyFactory keyFactory = KeyFactory.getInstance("RSA"); |
| X509EncodedKeySpec keySpec = new X509EncodedKeySpec(publicKeyBytes); |
| return keyFactory.generatePublic(keySpec); |
| } |
| } |
| |
| } |