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/*
* ============LICENSE_START=======================================================
* ONAP : ccsdk features
* ================================================================================
* Copyright (C) 2020 highstreet technologies GmbH Intellectual Property.
* All rights reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*
*/
package org.onap.ccsdk.features.sdnr.wt.oauthprovider.providers;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.spec.EncodedKeySpec;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import org.bouncycastle.util.io.pem.PemObject;
import org.bouncycastle.util.io.pem.PemReader;
public class PemUtils {
private static byte[] parsePEMFile(File pemFile) throws IOException {
if (!pemFile.isFile() || !pemFile.exists()) {
throw new FileNotFoundException(String.format("The file '%s' doesn't exist.", pemFile.getAbsolutePath()));
}
return parsePEMFile(new FileReader(pemFile));
}
private static byte[] parsePEMFile(Reader inputReader) throws IOException {
PemReader reader = new PemReader(inputReader);
PemObject pemObject = reader.readPemObject();
byte[] content = pemObject.getContent();
reader.close();
return content;
}
private static PublicKey getPublicKey(byte[] keyBytes, String algorithm) {
PublicKey publicKey = null;
try {
KeyFactory kf = KeyFactory.getInstance(algorithm);
EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
publicKey = kf.generatePublic(keySpec);
} catch (NoSuchAlgorithmException e) {
System.out.println("Could not reconstruct the public key, the given algorithm could not be found.");
} catch (InvalidKeySpecException e) {
System.out.println("Could not reconstruct the public key");
}
return publicKey;
}
private static PrivateKey getPrivateKey(byte[] keyBytes, String algorithm) {
PrivateKey privateKey = null;
try {
KeyFactory kf = KeyFactory.getInstance(algorithm);
EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes);
privateKey = kf.generatePrivate(keySpec);
} catch (NoSuchAlgorithmException e) {
System.out.println("Could not reconstruct the private key, the given algorithm could not be found.");
} catch (InvalidKeySpecException e) {
System.out.println("Could not reconstruct the private key");
}
return privateKey;
}
public static PublicKey readPublicKeyFromFile(String filepath, String algorithm) throws IOException {
byte[] bytes = PemUtils.parsePEMFile(new File(filepath));
return PemUtils.getPublicKey(bytes, algorithm);
}
public static PublicKey readPublicKey(String filecontent, String algorithm) throws IOException {
byte[] bytes = PemUtils.parsePEMFile(new StringReader(filecontent));
return PemUtils.getPublicKey(bytes, algorithm);
}
public static PrivateKey readPrivateKeyFromFile(String filepath, String algorithm) throws IOException {
byte[] bytes = PemUtils.parsePEMFile(new File(filepath));
return PemUtils.getPrivateKey(bytes, algorithm);
}
public static PrivateKey readPrivateKey(String filecontent, String algorithm) throws IOException {
byte[] bytes = PemUtils.parsePEMFile(new StringReader(filecontent));
return PemUtils.getPrivateKey(bytes, algorithm);
}
}
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