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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 1.5 to JDK 1.8. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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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);
    }
}