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/*
* ============LICENSE_START=======================================================
* PROJECT
* ================================================================================
* Copyright (C) 2020 Nokia. 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.aaf.certservice.certification.model;
import java.io.IOException;
import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Objects;
import java.util.stream.Collectors;
import org.bouncycastle.asn1.x500.X500Name;
import org.bouncycastle.asn1.x509.Extension;
import org.bouncycastle.asn1.x509.Extensions;
import org.bouncycastle.asn1.x509.GeneralName;
import org.bouncycastle.asn1.x509.GeneralNames;
import org.bouncycastle.pkcs.PKCS10CertificationRequest;
import org.bouncycastle.util.io.pem.PemObject;
import org.onap.aaf.certservice.certification.exception.CsrDecryptionException;
import org.onap.aaf.certservice.certification.exception.DecryptionException;
import org.onap.aaf.certservice.certification.exception.KeyDecryptionException;
public class CsrModel {
private final PKCS10CertificationRequest csr;
private final X500Name subjectData;
private final PrivateKey privateKey;
private final PublicKey publicKey;
private final List<String> sans;
public CsrModel(PKCS10CertificationRequest csr, X500Name subjectData, PrivateKey privateKey, PublicKey publicKey,
List<String> sans) {
this.csr = csr;
this.subjectData = subjectData;
this.privateKey = privateKey;
this.publicKey = publicKey;
this.sans = sans;
}
public PKCS10CertificationRequest getCsr() {
return csr;
}
public X500Name getSubjectData() {
return subjectData;
}
public PrivateKey getPrivateKey() {
return privateKey;
}
public PublicKey getPublicKey() {
return publicKey;
}
public List<String> getSans() {
return sans;
}
@Override
public String toString() {
return "Subject: { " + subjectData + " ,SANs: " + sans + " }";
}
public static class CsrModelBuilder {
private final PKCS10CertificationRequest csr;
private final PemObject privateKey;
public CsrModel build() throws DecryptionException {
X500Name subjectData = getSubjectData();
PrivateKey javaPrivateKey = convertingPemPrivateKeyToJavaSecurityPrivateKey(getPrivateKey());
PublicKey javaPublicKey = convertingPemPublicKeyToJavaSecurityPublicKey(getPublicKey());
List<String> sans = getSansData();
return new CsrModel(csr, subjectData, javaPrivateKey, javaPublicKey, sans);
}
public CsrModelBuilder(PKCS10CertificationRequest csr, PemObject privateKey) {
this.csr = csr;
this.privateKey = privateKey;
}
private PemObject getPublicKey() throws CsrDecryptionException {
try {
return new PemObject("PUBLIC KEY", csr.getSubjectPublicKeyInfo().getEncoded());
} catch (IOException e) {
throw new CsrDecryptionException("Reading Public Key from CSR failed", e.getCause());
}
}
private PemObject getPrivateKey() {
return privateKey;
}
private X500Name getSubjectData() {
return csr.getSubject();
}
private List<String> getSansData() {
if (!isAttrsEmpty() && !isAttrsValuesEmpty()) {
Extensions extensions = Extensions.getInstance(csr.getAttributes()[0].getAttrValues().getObjectAt(0));
GeneralName[] arrayOfAlternativeNames =
GeneralNames.fromExtensions(extensions, Extension.subjectAlternativeName).getNames();
return Arrays.stream(arrayOfAlternativeNames).map(GeneralName::getName).map(Objects::toString)
.collect(Collectors.toList());
}
return Collections.emptyList();
}
private boolean isAttrsValuesEmpty() {
return csr.getAttributes()[0].getAttrValues().size() == 0;
}
private boolean isAttrsEmpty() {
return csr.getAttributes().length == 0;
}
private PrivateKey convertingPemPrivateKeyToJavaSecurityPrivateKey(PemObject privateKey)
throws KeyDecryptionException {
try {
KeyFactory factory = KeyFactory.getInstance("RSA");
PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(privateKey.getContent());
return factory.generatePrivate(keySpec);
} catch (NoSuchAlgorithmException | InvalidKeySpecException e) {
throw new KeyDecryptionException("Converting Private Key failed", e.getCause());
}
}
private PublicKey convertingPemPublicKeyToJavaSecurityPublicKey(PemObject publicKey)
throws KeyDecryptionException {
try {
KeyFactory factory = KeyFactory.getInstance("RSA");
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(publicKey.getContent());
return factory.generatePublic(keySpec);
} catch (InvalidKeySpecException | NoSuchAlgorithmException e) {
throw new KeyDecryptionException("Converting Public Key from CSR failed", e.getCause());
}
}
}
}
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