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

Go to download
Show more of this group Show more artifacts with this name
Show all versions of bcutil-debug-jdk18on Show documentation
The Bouncy Castle Java APIs for ASN.1 extension and utility APIs used to support bcpkix and bctls. This jar contains APIs for JDK 1.8 and up.
There is a newer version: 1.79
Show newest version
package org.bouncycastle.asn1.cms;

import org.bouncycastle.asn1.ASN1Choice;
import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DERTaggedObject;

/**
 * RFC 5652:
 * Content encryption key delivery mechanisms.
 * 
 * 
 * RecipientInfo ::= CHOICE {
 *     ktri      KeyTransRecipientInfo,
 *     kari  [1] KeyAgreeRecipientInfo,
 *     kekri [2] KEKRecipientInfo,
 *     pwri  [3] PasswordRecipientInfo,
 *     ori   [4] OtherRecipientInfo }
 * 
 */
public class RecipientInfo
    extends ASN1Object
    implements ASN1Choice
{
    ASN1Encodable    info;

    public RecipientInfo(
        KeyTransRecipientInfo info)
    {
        this.info = info;
    }

    public RecipientInfo(
        KeyAgreeRecipientInfo info)
    {
        this.info = new DERTaggedObject(false, 1, info);
    }

    public RecipientInfo(
        KEKRecipientInfo info)
    {
        this.info = new DERTaggedObject(false, 2, info);
    }

    public RecipientInfo(
        PasswordRecipientInfo info)
    {
        this.info = new DERTaggedObject(false, 3, info);
    }

    public RecipientInfo(
        OtherRecipientInfo info)
    {
        this.info = new DERTaggedObject(false, 4, info);
    }

    public RecipientInfo(
        ASN1Primitive   info)
    {
        this.info = info;
    }

    /**
     * Return a RecipientInfo object from the given object.
     * 
     * Accepted inputs:
     * 

     *  null → null
     * 
 {@link RecipientInfo} object
     * 
 {@link org.bouncycastle.asn1.ASN1Sequence#getInstance(java.lang.Object) ASN1Sequence} input formats with RecipientInfo structure inside
     * 
 {@link org.bouncycastle.asn1.ASN1TaggedObject#getInstance(java.lang.Object) ASN1TaggedObject} input formats with RecipientInfo structure inside
     * 
     *
     * @param o the object we want converted.
     * @exception IllegalArgumentException if the object cannot be converted.
     */
    public static RecipientInfo getInstance(
        Object  o)
    {
        if (o == null || o instanceof RecipientInfo)
        {
            return (RecipientInfo)o;
        }
        else if (o instanceof ASN1Sequence)
        {
            return new RecipientInfo((ASN1Sequence)o);
        }
        else if (o instanceof ASN1TaggedObject)
        {
            return new RecipientInfo((ASN1TaggedObject)o);
        }

        throw new IllegalArgumentException("unknown object in factory: "
                                                    + o.getClass().getName());
    }

    public ASN1Integer getVersion()
    {
        if (info instanceof ASN1TaggedObject)
        {
            ASN1TaggedObject o = (ASN1TaggedObject)info;

            switch (o.getTagNo())
            {
            case 1:
                return KeyAgreeRecipientInfo.getInstance(o, false).getVersion();
            case 2:
                return getKEKInfo(o).getVersion();
            case 3:
                return PasswordRecipientInfo.getInstance(o, false).getVersion();
            case 4:
                return new ASN1Integer(0);    // no syntax version for OtherRecipientInfo
            default:
                throw new IllegalStateException("unknown tag");
            }
        }

        return KeyTransRecipientInfo.getInstance(info).getVersion();
    }

    public boolean isTagged()
    {
        return (info instanceof ASN1TaggedObject);
    }

    public ASN1Encodable getInfo()
    {
        if (info instanceof ASN1TaggedObject)
        {
            ASN1TaggedObject o = (ASN1TaggedObject)info;

            switch (o.getTagNo())
            {
            case 1:
                return KeyAgreeRecipientInfo.getInstance(o, false);
            case 2:
                return getKEKInfo(o);
            case 3:
                return PasswordRecipientInfo.getInstance(o, false);
            case 4:
                return OtherRecipientInfo.getInstance(o, false);
            default:
                throw new IllegalStateException("unknown tag");
            }
        }

        return KeyTransRecipientInfo.getInstance(info);
    }

    private KEKRecipientInfo getKEKInfo(ASN1TaggedObject o)
    {
        if (o.isExplicit())
        {                        // compatibilty with erroneous version
            return KEKRecipientInfo.getInstance(o, true);
        }
        else
        {
            return KEKRecipientInfo.getInstance(o, false);
        }
    }

    /**
     * Produce an object suitable for an ASN1OutputStream.
     */
    public ASN1Primitive toASN1Primitive()
    {
        return info.toASN1Primitive();
    }
}