org.bouncycastle.asn1.cms.CMSAlgorithmProtection Maven / Gradle / Ivy

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The Bouncy Castle Java APIs for ASN.1 extension and utility APIs used to support bcpkix and bctls with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified and used appropriately.

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/***************************************************************/
/******    DO NOT EDIT THIS CLASS bc-java SOURCE FILE     ******/
/***************************************************************/
package org.bouncycastle.asn1.cms;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.DERTaggedObject;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;

/**
 * From RFC 6211
 *  * CMSAlgorithmProtection ::= SEQUENCE {
 *    digestAlgorithm         DigestAlgorithmIdentifier,
 *    signatureAlgorithm  [1] SignatureAlgorithmIdentifier OPTIONAL,
 *    macAlgorithm        [2] MessageAuthenticationCodeAlgorithm
 *                                     OPTIONAL
 * }
 * (WITH COMPONENTS { signatureAlgorithm PRESENT,
 *                    macAlgorithm ABSENT } |
 *  WITH COMPONENTS { signatureAlgorithm ABSENT,
 *                    macAlgorithm PRESENT })
 * 
 */
public class CMSAlgorithmProtection
    extends ASN1Object
{
    public static final int SIGNATURE = 1;
    public static final int MAC = 2;

    private final AlgorithmIdentifier digestAlgorithm;
    private final AlgorithmIdentifier signatureAlgorithm;
    private final AlgorithmIdentifier macAlgorithm;

    public CMSAlgorithmProtection(AlgorithmIdentifier digestAlgorithm, int type, AlgorithmIdentifier algorithmIdentifier)
    {
        if (digestAlgorithm == null || algorithmIdentifier == null)
        {
            throw new NullPointerException("AlgorithmIdentifiers cannot be null");
        }

        this.digestAlgorithm = digestAlgorithm;

        if (type == 1)
        {
            this.signatureAlgorithm = algorithmIdentifier;
            this.macAlgorithm = null;
        }
        else if (type == 2)
        {
            this.signatureAlgorithm = null;
            this.macAlgorithm = algorithmIdentifier;
        }
        else
        {
            throw new IllegalArgumentException("Unknown type: " + type);
        }
    }

    private CMSAlgorithmProtection(ASN1Sequence sequence)
    {
        if (sequence.size() != 2)
        {
            throw new IllegalArgumentException("Sequence wrong size: One of signatureAlgorithm or macAlgorithm must be present");
        }

        this.digestAlgorithm = AlgorithmIdentifier.getInstance(sequence.getObjectAt(0));

        ASN1TaggedObject tagged = ASN1TaggedObject.getInstance(sequence.getObjectAt(1));
        if (tagged.getTagNo() == 1)
        {
            this.signatureAlgorithm = AlgorithmIdentifier.getInstance(tagged, false);
            this.macAlgorithm = null;
        }
        else if (tagged.getTagNo() == 2)
        {
            this.signatureAlgorithm = null;

            this.macAlgorithm = AlgorithmIdentifier.getInstance(tagged, false);
        }
        else
        {
            throw new IllegalArgumentException("Unknown tag found: " + tagged.getTagNo());
        }
    }

    public static CMSAlgorithmProtection getInstance(
        Object obj)
    {
        if (obj instanceof CMSAlgorithmProtection)
        {
            return (CMSAlgorithmProtection)obj;
        }
        else if (obj != null)
        {
            return new CMSAlgorithmProtection(ASN1Sequence.getInstance(obj));
        }

        return null;
    }


    public AlgorithmIdentifier getDigestAlgorithm()
    {
        return digestAlgorithm;
    }

    public AlgorithmIdentifier getMacAlgorithm()
    {
        return macAlgorithm;
    }

    public AlgorithmIdentifier getSignatureAlgorithm()
    {
        return signatureAlgorithm;
    }

    public ASN1Primitive toASN1Primitive()
    {
        ASN1EncodableVector v = new ASN1EncodableVector();

        v.add(digestAlgorithm);
        if (signatureAlgorithm != null)
        {
            v.add(new DERTaggedObject(false, 1, signatureAlgorithm));
        }
        if (macAlgorithm != null)
        {
            v.add(new DERTaggedObject(false, 2, macAlgorithm));
        }

        return new DERSequence(v);
    }
}