org.bouncycastle.asn1.cms.KeyAgreeRecipientInfo 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.ASN1Integer;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1OctetString;
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;

/**
 * RFC 5652:
 * Content encryption key delivery mechanisms.
 * 
 * 
 * KeyAgreeRecipientInfo ::= SEQUENCE {
 *     version CMSVersion,  -- always set to 3
 *     originator [0] EXPLICIT OriginatorIdentifierOrKey,
 *     ukm [1] EXPLICIT UserKeyingMaterial OPTIONAL,
 *     keyEncryptionAlgorithm KeyEncryptionAlgorithmIdentifier,
 *     recipientEncryptedKeys RecipientEncryptedKeys 
 * }
 *
 * UserKeyingMaterial ::= OCTET STRING
 * 
 */
public class KeyAgreeRecipientInfo
    extends ASN1Object
{
    private ASN1Integer                  version;
    private OriginatorIdentifierOrKey   originator;
    private ASN1OctetString             ukm;
    private AlgorithmIdentifier         keyEncryptionAlgorithm;
    private ASN1Sequence                recipientEncryptedKeys;
    
    public KeyAgreeRecipientInfo(
        OriginatorIdentifierOrKey   originator,
        ASN1OctetString             ukm,
        AlgorithmIdentifier         keyEncryptionAlgorithm,
        ASN1Sequence                recipientEncryptedKeys)
    {
        this.version = new ASN1Integer(3);
        this.originator = originator;
        this.ukm = ukm;
        this.keyEncryptionAlgorithm = keyEncryptionAlgorithm;
        this.recipientEncryptedKeys = recipientEncryptedKeys;
    }

    private KeyAgreeRecipientInfo(
        ASN1Sequence seq)
    {
        int index = 0;
        
        version = (ASN1Integer)seq.getObjectAt(index++);
        originator = OriginatorIdentifierOrKey.getInstance(
                            (ASN1TaggedObject)seq.getObjectAt(index++), true);

        if (seq.getObjectAt(index) instanceof ASN1TaggedObject)
        {
            ukm = ASN1OctetString.getInstance(
                            (ASN1TaggedObject)seq.getObjectAt(index++), true);
        }

        keyEncryptionAlgorithm = AlgorithmIdentifier.getInstance(
                                                seq.getObjectAt(index++));

        recipientEncryptedKeys = (ASN1Sequence)seq.getObjectAt(index++);
    }
    
    /**
     * Return a KeyAgreeRecipientInfo object from a tagged object.
     *
     * @param obj the tagged object holding the object we want.
     * @param explicit true if the object is meant to be explicitly
     *              tagged false otherwise.
     * @exception IllegalArgumentException if the object held by the
     *          tagged object cannot be converted.
     */
    public static KeyAgreeRecipientInfo getInstance(
        ASN1TaggedObject    obj,
        boolean             explicit)
    {
        return getInstance(ASN1Sequence.getInstance(obj, explicit));
    }
    
    /**
     * Return a KeyAgreeRecipientInfo object from the given object.
     * 
     * Accepted inputs:
     * 

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

    public ASN1Integer getVersion()
    {
        return version;
    }

    public OriginatorIdentifierOrKey getOriginator()
    {
        return originator;
    }

    public ASN1OctetString getUserKeyingMaterial()
    {
        return ukm;
    }

    public AlgorithmIdentifier getKeyEncryptionAlgorithm()
    {
        return keyEncryptionAlgorithm;
    }

    public ASN1Sequence getRecipientEncryptedKeys()
    {
        return recipientEncryptedKeys;
    }

    /** 
     * Produce an object suitable for an ASN1OutputStream.
     */
    public ASN1Primitive toASN1Primitive()
    {
        ASN1EncodableVector  v = new ASN1EncodableVector();

        v.add(version);
        v.add(new DERTaggedObject(true, 0, originator));
        
        if (ukm != null)
        {
            v.add(new DERTaggedObject(true, 1, ukm));
        }
        
        v.add(keyEncryptionAlgorithm);
        v.add(recipientEncryptedKeys);

        return new DERSequence(v);
    }
}