org.bouncycastle.operator.bc.BcDSAContentVerifierProviderBuilder.java Source code

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Here is the source code for org.bouncycastle.operator.bc.BcDSAContentVerifierProviderBuilder.java

Source

package org.bouncycastle.operator.bc;

import java.io.IOException;

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.DSASigner;
import org.bouncycastle.crypto.util.PublicKeyFactory;
import org.bouncycastle.operator.DigestAlgorithmIdentifierFinder;
import org.bouncycastle.operator.OperatorCreationException;

public class BcDSAContentVerifierProviderBuilder extends BcContentVerifierProviderBuilder {
    private DigestAlgorithmIdentifierFinder digestAlgorithmFinder;

    public BcDSAContentVerifierProviderBuilder(DigestAlgorithmIdentifierFinder digestAlgorithmFinder) {
        this.digestAlgorithmFinder = digestAlgorithmFinder;
    }

    protected Signer createSigner(AlgorithmIdentifier sigAlgId) throws OperatorCreationException {
        AlgorithmIdentifier digAlg = digestAlgorithmFinder.find(sigAlgId);
        Digest dig = digestProvider.get(digAlg);

        return new DSADigestSigner(new DSASigner(), dig);
    }

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