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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.eac.operator.jcajce;

import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.Signature;
import java.util.Hashtable;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.eac.EACObjectIdentifiers;

abstract class EACHelper
{
    private static final Hashtable sigNames = new Hashtable();

    static
    {
        sigNames.put(EACObjectIdentifiers.id_TA_RSA_v1_5_SHA_1, "SHA1withRSA");
        sigNames.put(EACObjectIdentifiers.id_TA_RSA_v1_5_SHA_256, "SHA256withRSA");
        sigNames.put(EACObjectIdentifiers.id_TA_RSA_PSS_SHA_1, "SHA1withRSAandMGF1");
        sigNames.put(EACObjectIdentifiers.id_TA_RSA_PSS_SHA_256, "SHA256withRSAandMGF1");
        sigNames.put(EACObjectIdentifiers.id_TA_RSA_v1_5_SHA_512, "SHA512withRSA");
        sigNames.put(EACObjectIdentifiers.id_TA_RSA_PSS_SHA_512, "SHA512withRSAandMGF1");

        sigNames.put(EACObjectIdentifiers.id_TA_ECDSA_SHA_1, "SHA1withECDSA");
        sigNames.put(EACObjectIdentifiers.id_TA_ECDSA_SHA_224, "SHA224withECDSA");
        sigNames.put(EACObjectIdentifiers.id_TA_ECDSA_SHA_256, "SHA256withECDSA");
        sigNames.put(EACObjectIdentifiers.id_TA_ECDSA_SHA_384, "SHA384withECDSA");
        sigNames.put(EACObjectIdentifiers.id_TA_ECDSA_SHA_512, "SHA512withECDSA");
    }

    public Signature getSignature(ASN1ObjectIdentifier oid)
        throws NoSuchProviderException, NoSuchAlgorithmException
    {
        return createSignature((String)sigNames.get(oid));
    }

    protected abstract Signature createSignature(String type)
        throws NoSuchProviderException, NoSuchAlgorithmException;
}