dorkbox.util.crypto.signers.BcECDSAContentVerifierProviderBuilder Maven / Gradle / Ivy

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/*
 * Copyright 2013 dorkbox, llc
 *
 * 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.
 */
package dorkbox.util.crypto.signers;

import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
import org.bouncycastle.crypto.Digest;
import org.bouncycastle.crypto.Signer;
import org.bouncycastle.crypto.params.AsymmetricKeyParameter;
import org.bouncycastle.crypto.signers.DSADigestSigner;
import org.bouncycastle.crypto.signers.ECDSASigner;
import org.bouncycastle.crypto.util.PublicKeyFactory;
import org.bouncycastle.jcajce.provider.util.DigestFactory;
import org.bouncycastle.operator.DefaultDigestAlgorithmIdentifierFinder;
import org.bouncycastle.operator.DigestAlgorithmIdentifierFinder;
import org.bouncycastle.operator.OperatorCreationException;
import org.bouncycastle.operator.bc.BcContentVerifierProviderBuilder;

import java.io.IOException;

public
class BcECDSAContentVerifierProviderBuilder extends BcContentVerifierProviderBuilder {

    public
    BcECDSAContentVerifierProviderBuilder(DigestAlgorithmIdentifierFinder digestAlgorithmFinder) {
    }

    @Override
    protected
    AsymmetricKeyParameter extractKeyParameters(SubjectPublicKeyInfo publicKeyInfo) throws IOException {
        return PublicKeyFactory.createKey(publicKeyInfo);
    }

    @Override
    protected
    Signer createSigner(AlgorithmIdentifier sigAlgId) throws OperatorCreationException {
        AlgorithmIdentifier digAlgId = new DefaultDigestAlgorithmIdentifierFinder().find(sigAlgId);

        Digest digest = DigestFactory.getDigest(digAlgId.getAlgorithm()
                                                        .getId()); // 1.2.23.4.5.6, etc
        return new DSADigestSigner(new ECDSASigner(), digest);
    }
}