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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.8 and up. The APIs are designed primarily to be used in conjunction with the BC LTS provider but may also be used with other providers providing cryptographic services.

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package org.bouncycastle.operator.bc;

import java.io.IOException;

import org.bouncycastle.asn1.edec.EdECObjectIdentifiers;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
import org.bouncycastle.crypto.Signer;
import org.bouncycastle.crypto.params.AsymmetricKeyParameter;
import org.bouncycastle.crypto.signers.Ed25519Signer;
import org.bouncycastle.crypto.signers.Ed448Signer;
import org.bouncycastle.crypto.util.PublicKeyFactory;
import org.bouncycastle.operator.OperatorCreationException;

public class BcEdDSAContentVerifierProviderBuilder
    extends BcContentVerifierProviderBuilder
{
    public static final byte[] DEFAULT_CONTEXT = new byte[0];

    public BcEdDSAContentVerifierProviderBuilder()
    {
    }

    protected Signer createSigner(AlgorithmIdentifier sigAlgId)
        throws OperatorCreationException
    {
        if (sigAlgId.getAlgorithm().equals(EdECObjectIdentifiers.id_Ed448))
        {
            return new Ed448Signer(DEFAULT_CONTEXT);
        }
        else
        {
            return new Ed25519Signer();
        }
    }

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