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/*
* Copyright 2019 Nokia
* <p>
* 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
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* 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.onap.cvc.csar.rsa;
import org.apache.commons.codec.binary.Base64;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.PublicKey;
import java.security.Signature;
import java.security.SignatureException;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
public class X509RsaCertification {
private static final Logger LOG = LoggerFactory.getLogger(X509RsaCertification.class);
PublicKey generatePublicKey(String cert) throws CertificateException {
byte[] encodedCert = cert.getBytes(StandardCharsets.UTF_8);
byte[] decodedCert = Base64.decodeBase64(encodedCert);
CertificateFactory certFactory = CertificateFactory.getInstance("X.509");
InputStream in = new ByteArrayInputStream(decodedCert);
X509Certificate certificate = (X509Certificate) certFactory.generateCertificate(in);
LOG.info(String.format("Subject DN : %s", certificate.getSubjectDN().getName()));
LOG.info(String.format("Issuer : %s", certificate.getIssuerDN().getName()));
LOG.info(String.format("Not After: %s", certificate.getNotAfter()));
LOG.info(String.format("Not Before: %s", certificate.getNotBefore()));
LOG.info(String.format("version: %d", certificate.getVersion()));
LOG.info(String.format("serial number : %s", certificate.getSerialNumber()));
return certificate.getPublicKey();
}
boolean verify(byte[] content, String signature, PublicKey publicKey) throws NoSuchAlgorithmException, InvalidKeyException, SignatureException {
Signature publicSignature = Signature.getInstance("SHA256withRSA");
publicSignature.initVerify(publicKey);
publicSignature.update(content);
byte[] signatureBytes = java.util.Base64.getDecoder().decode(signature);
return publicSignature.verify(signatureBytes);
}
}
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