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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.pkcs.bc;

import java.io.IOException;

import org.bouncycastle.asn1.pkcs.CertificationRequest;
import org.bouncycastle.crypto.params.AsymmetricKeyParameter;
import org.bouncycastle.crypto.util.PublicKeyFactory;
import org.bouncycastle.pkcs.PKCS10CertificationRequest;
import org.bouncycastle.pkcs.PKCSException;

public class BcPKCS10CertificationRequest
    extends PKCS10CertificationRequest
{
    public BcPKCS10CertificationRequest(CertificationRequest certificationRequest)
    {
        super(certificationRequest);
    }

    public BcPKCS10CertificationRequest(byte[] encoding)
        throws IOException
    {
        super(encoding);
    }

    public BcPKCS10CertificationRequest(PKCS10CertificationRequest requestHolder)
    {
        super(requestHolder.toASN1Structure());
    }

    public AsymmetricKeyParameter getPublicKey()
        throws PKCSException
    {
        try
        {
            return PublicKeyFactory.createKey(this.getSubjectPublicKeyInfo());
        }
        catch (IOException e)
        {
            throw new PKCSException("error extracting key encoding: " + e.getMessage(), e);
        }
    }
}