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The Bouncy Castle Java S/MIME APIs for handling S/MIME protocols. This jar contains S/MIME APIs for JDK 1.5 and up. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs. The JavaMail API and the Java activation framework will also be needed.

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package org.bouncycastle.operator.bc;

import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.crypto.Digest;
import org.bouncycastle.crypto.Signer;
import org.bouncycastle.crypto.signers.RSADigestSigner;
import org.bouncycastle.operator.OperatorCreationException;

public class BcRSAContentSignerBuilder
    extends BcContentSignerBuilder
{
    public BcRSAContentSignerBuilder(AlgorithmIdentifier sigAlgId, AlgorithmIdentifier digAlgId)
    {
        super(sigAlgId, digAlgId);
    }

    protected Signer createSigner(AlgorithmIdentifier sigAlgId, AlgorithmIdentifier digAlgId)
        throws OperatorCreationException
    {
        Digest dig = BcUtil.createDigest(digAlgId);

        return new RSADigestSigner(dig);
    }
}