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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;
/**
* <a href="http://tools.ietf.org/html/rfc5652#section-6.2.2">RFC 5652</a>:
* Content encryption key delivery mechanisms.
* <p>
* <pre>
* KeyAgreeRecipientInfo ::= SEQUENCE {
* version CMSVersion, -- always set to 3
* originator [0] EXPLICIT OriginatorIdentifierOrKey,
* ukm [1] EXPLICIT UserKeyingMaterial OPTIONAL,
* keyEncryptionAlgorithm KeyEncryptionAlgorithmIdentifier,
* recipientEncryptedKeys RecipientEncryptedKeys
* }
*
* UserKeyingMaterial ::= OCTET STRING
* </pre>
*/
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;
}
/**
* @deprecated use getInstance()
*/
public 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.
* <p>
* Accepted inputs:
* <ul>
* <li> null → null
* <li> {@link KeyAgreeRecipientInfo} object
* <li> {@link org.bouncycastle.asn1.ASN1Sequence#getInstance(java.lang.Object) ASN1Sequence} input formats with KeyAgreeRecipientInfo structure inside
* </ul>
*
* @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);
}
}
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