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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.openssl;

import java.io.IOException;

import org.bouncycastle.asn1.ASN1InputStream;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.cert.X509CertificateHolder;
import org.bouncycastle.util.Arrays;

/**
 * Holder for an OpenSSL trusted certificate block.
 */
public class X509TrustedCertificateBlock
{
    private final X509CertificateHolder certificateHolder;
    private final CertificateTrustBlock trustBlock;

    public X509TrustedCertificateBlock(X509CertificateHolder certificateHolder, CertificateTrustBlock trustBlock)
    {
        this.certificateHolder = certificateHolder;
        this.trustBlock = trustBlock;
    }

    public X509TrustedCertificateBlock(byte[] encoding)
        throws IOException
    {
        ASN1InputStream aIn = new ASN1InputStream(encoding);

        this.certificateHolder = new X509CertificateHolder(aIn.readObject().getEncoded());

        ASN1Object tBlock = aIn.readObject();

        if (tBlock != null)
        {
            this.trustBlock = new CertificateTrustBlock(tBlock.getEncoded());
        }
        else
        {
            this.trustBlock = null;
        }
    }

    public byte[] getEncoded()
        throws IOException
    {
        return Arrays.concatenate(certificateHolder.getEncoded(), trustBlock.toASN1Sequence().getEncoded());
    }

    /**
     * Return the certificate associated with this Trusted Certificate
     *
     * @return the certificate holder.
     */
    public X509CertificateHolder getCertificateHolder()
    {
        return certificateHolder;
    }

    /**
     * Return the trust block associated with this Trusted Certificate
     *
     * @return the trust block.
     */
    public CertificateTrustBlock getTrustBlock()
    {
        return trustBlock;
    }
}