certService/src/main/java/org/onap/aaf/certservice/certification/RsaContentSignerBuilder.java


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/*
 * ============LICENSE_START=======================================================
 * Cert Service
 * ================================================================================
 * 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;

import java.io.IOException;
import java.security.PrivateKey;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.crypto.util.PrivateKeyFactory;
import org.bouncycastle.operator.ContentSigner;
import org.bouncycastle.operator.DefaultDigestAlgorithmIdentifierFinder;
import org.bouncycastle.operator.OperatorCreationException;
import org.bouncycastle.operator.bc.BcRSAContentSignerBuilder;
import org.bouncycastle.pkcs.PKCS10CertificationRequest;
import org.springframework.stereotype.Component;

@Component
public class RsaContentSignerBuilder {

    ContentSigner build(PKCS10CertificationRequest csr, PrivateKey privateKey)
            throws IOException, OperatorCreationException {
        AlgorithmIdentifier sigAlgId = csr.getSignatureAlgorithm();
        AlgorithmIdentifier digAlgId = new DefaultDigestAlgorithmIdentifierFinder().find(sigAlgId);

        return new BcRSAContentSignerBuilder(sigAlgId, digAlgId)
                       .build(PrivateKeyFactory.createKey(privateKey.getEncoded()));
    }

}