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/*
* Copyright 2020 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.security;
import org.bouncycastle.asn1.cms.ContentInfo;
import org.bouncycastle.cert.X509CertificateHolder;
import org.bouncycastle.cms.CMSException;
import org.bouncycastle.cms.CMSProcessableByteArray;
import org.bouncycastle.cms.CMSSignedData;
import org.bouncycastle.cms.CMSTypedData;
import org.bouncycastle.cms.SignerInformation;
import org.bouncycastle.openssl.PEMParser;
import org.bouncycastle.util.Store;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.nio.charset.Charset;
import java.util.Collection;
import java.util.Optional;
public class CmsSignatureDataFactory {
public CmsSignatureData createForFirstSigner(final byte[] cmsSignature, final byte[] fileContent)
throws CmsSignatureLoadingException{
try (ByteArrayInputStream cmsSignatureStream = new ByteArrayInputStream(cmsSignature)) {
CMSSignedData signedData = getCMSSignedData(fileContent, cmsSignatureStream);
Collection<SignerInformation> signers = signedData.getSignerInfos().getSigners();
Store<X509CertificateHolder> certificates = signedData.getCertificates();
SignerInformation firstSigner = getFirstSigner(signers);
CmsSignatureData signatureData = new CmsSignatureData(firstSigner);
getFirstSignerCertificate(certificates, firstSigner).ifPresent(
signatureData::loadCertificate
);
return signatureData;
} catch (CertificateLoadingException | IOException | CMSException e) {
throw new CmsSignatureLoadingException("Unexpected error occurred during signature validation!", e);
}
}
private SignerInformation getFirstSigner(Collection<SignerInformation> signers) {
return signers.iterator().next();
}
private Optional<byte[]> getFirstSignerCertificate(
Store<X509CertificateHolder> certificates,
SignerInformation firstSigner)
throws IOException {
Collection<X509CertificateHolder> firstSignerCertificates = certificates.getMatches(firstSigner.getSID());
Optional<byte[]> cert;
if (!firstSignerCertificates.isEmpty()) {
X509CertificateHolder firstSignerFirstCertificate = firstSignerCertificates.iterator().next();
cert = Optional.of(firstSignerFirstCertificate.getEncoded());
} else {
cert = Optional.empty();
}
return cert;
}
private CMSSignedData getCMSSignedData(byte[] innerPackageFileCSAR, ByteArrayInputStream signatureStream) throws IOException, CmsSignatureLoadingException, CMSException {
ContentInfo signature = produceSignature(signatureStream);
CMSTypedData signedContent = new CMSProcessableByteArray(innerPackageFileCSAR);
return new CMSSignedData(signedContent, signature);
}
private ContentInfo produceSignature(ByteArrayInputStream signatureStream) throws IOException, CmsSignatureLoadingException {
Object parsedObject = new PEMParser(new InputStreamReader(signatureStream, Charset.defaultCharset())).readObject();
if (!(parsedObject instanceof ContentInfo)) {
throw new CmsSignatureLoadingException("Signature is not recognized!");
}
return ContentInfo.getInstance(parsedObject);
}
}
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