hadoop CertificateUtil 源码
haddop CertificateUtil 代码
文件路径：/hadoop-common-project/hadoop-auth/src/main/java/org/apache/hadoop/security/authentication/util/CertificateUtil.java
/**
* 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.hadoop.security.authentication.util;
import java.io.ByteArrayInputStream;
import java.nio.charset.StandardCharsets;
import java.security.PublicKey;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
import java.security.interfaces.RSAPublicKey;
import javax.servlet.ServletException;
public class CertificateUtil {
private static final String PEM_HEADER = "-----BEGIN CERTIFICATE-----\n";
private static final String PEM_FOOTER = "\n-----END CERTIFICATE-----";
/**
* Gets an RSAPublicKey from the provided PEM encoding.
*
* @param pem
* - the pem encoding from config without the header and footer
* @return RSAPublicKey the RSA public key
* @throws ServletException thrown if a processing error occurred
*/
public static RSAPublicKey parseRSAPublicKey(String pem) throws ServletException {
String fullPem = PEM_HEADER + pem + PEM_FOOTER;
PublicKey key = null;
try {
CertificateFactory fact = CertificateFactory.getInstance("X.509");
ByteArrayInputStream is = new ByteArrayInputStream(
fullPem.getBytes(StandardCharsets.UTF_8));
X509Certificate cer = (X509Certificate) fact.generateCertificate(is);
key = cer.getPublicKey();
} catch (CertificateException ce) {
String message = null;
if (pem.startsWith(PEM_HEADER)) {
message = "CertificateException - be sure not to include PEM header "
+ "and footer in the PEM configuration element.";
} else {
message = "CertificateException - PEM may be corrupt";
}
throw new ServletException(message, ce);
}
return (RSAPublicKey) key;
}
}
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