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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.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
import org.bouncycastle.crypto.AsymmetricBlockCipher;
import org.bouncycastle.crypto.encodings.PKCS1Encoding;
import org.bouncycastle.crypto.engines.RSAEngine;
import org.bouncycastle.crypto.params.AsymmetricKeyParameter;
import org.bouncycastle.crypto.util.PublicKeyFactory;

public class BcRSAAsymmetricKeyWrapper
    extends BcAsymmetricKeyWrapper
{
    public BcRSAAsymmetricKeyWrapper(AlgorithmIdentifier encAlgId, AsymmetricKeyParameter publicKey)
    {
        super(encAlgId, publicKey);
    }

    public BcRSAAsymmetricKeyWrapper(AlgorithmIdentifier encAlgId, SubjectPublicKeyInfo publicKeyInfo)
        throws IOException
    {
        super(encAlgId, PublicKeyFactory.createKey(publicKeyInfo));
    }

    protected AsymmetricBlockCipher createAsymmetricWrapper(ASN1ObjectIdentifier algorithm)
    {
        return new PKCS1Encoding(new RSAEngine());
    }
}