org.spongycastle.operator.bc.BcRSAContentVerifierProviderBuilder Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of scprov-jdk15 Show documentation

Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for Android. Android ships with a stripped-down version of Bouncy Castle - this causes classloader collisions if you try to add an alternative (updated/complete) Bouncy Castle jar. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5.

There is a newer version: 1.46.99.3-UNOFFICIAL-ROBERTO-RELEASE

Show newest version

package org.spongycastle.operator.bc;

import java.io.IOException;

import org.spongycastle.asn1.x509.AlgorithmIdentifier;
import org.spongycastle.asn1.x509.SubjectPublicKeyInfo;
import org.spongycastle.crypto.Digest;
import org.spongycastle.crypto.Signer;
import org.spongycastle.crypto.params.AsymmetricKeyParameter;
import org.spongycastle.crypto.signers.RSADigestSigner;
import org.spongycastle.crypto.util.PublicKeyFactory;
import org.spongycastle.operator.DigestAlgorithmIdentifierFinder;
import org.spongycastle.operator.OperatorCreationException;

public class BcRSAContentVerifierProviderBuilder
    extends BcContentVerifierProviderBuilder
{
    private DigestAlgorithmIdentifierFinder digestAlgorithmFinder;

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

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

        return new RSADigestSigner(dig);
    }

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