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package org.spongycastle.cms;
import java.io.IOException;
import java.util.List;
import org.spongycastle.asn1.ASN1OctetString;
import org.spongycastle.asn1.ASN1Sequence;
import org.spongycastle.asn1.cms.IssuerAndSerialNumber;
import org.spongycastle.asn1.cms.KeyAgreeRecipientIdentifier;
import org.spongycastle.asn1.cms.KeyAgreeRecipientInfo;
import org.spongycastle.asn1.cms.OriginatorIdentifierOrKey;
import org.spongycastle.asn1.cms.OriginatorPublicKey;
import org.spongycastle.asn1.cms.RecipientEncryptedKey;
import org.spongycastle.asn1.cms.RecipientKeyIdentifier;
import org.spongycastle.asn1.x509.AlgorithmIdentifier;
import org.spongycastle.asn1.x509.SubjectKeyIdentifier;
import org.spongycastle.asn1.x509.SubjectPublicKeyInfo;
/**
* the RecipientInfo class for a recipient who has been sent a message
* encrypted using key agreement.
*/
public class KeyAgreeRecipientInformation
extends RecipientInformation
{
private KeyAgreeRecipientInfo info;
private ASN1OctetString encryptedKey;
static void readRecipientInfo(List infos, KeyAgreeRecipientInfo info,
AlgorithmIdentifier messageAlgorithm, CMSSecureReadable secureReadable, AuthAttributesProvider additionalData)
{
ASN1Sequence s = info.getRecipientEncryptedKeys();
for (int i = 0; i < s.size(); ++i)
{
RecipientEncryptedKey id = RecipientEncryptedKey.getInstance(
s.getObjectAt(i));
RecipientId rid;
KeyAgreeRecipientIdentifier karid = id.getIdentifier();
IssuerAndSerialNumber iAndSN = karid.getIssuerAndSerialNumber();
if (iAndSN != null)
{
rid = new KeyAgreeRecipientId(iAndSN.getName(), iAndSN.getSerialNumber().getValue());
}
else
{
RecipientKeyIdentifier rKeyID = karid.getRKeyID();
// Note: 'date' and 'other' fields of RecipientKeyIdentifier appear to be only informational
rid = new KeyAgreeRecipientId(rKeyID.getSubjectKeyIdentifier().getOctets());
}
infos.add(new KeyAgreeRecipientInformation(info, rid, id.getEncryptedKey(), messageAlgorithm,
secureReadable, additionalData));
}
}
KeyAgreeRecipientInformation(
KeyAgreeRecipientInfo info,
RecipientId rid,
ASN1OctetString encryptedKey,
AlgorithmIdentifier messageAlgorithm,
CMSSecureReadable secureReadable,
AuthAttributesProvider additionalData)
{
super(info.getKeyEncryptionAlgorithm(), messageAlgorithm, secureReadable, additionalData);
this.info = info;
this.rid = rid;
this.encryptedKey = encryptedKey;
}
private SubjectPublicKeyInfo getSenderPublicKeyInfo(AlgorithmIdentifier recKeyAlgId,
OriginatorIdentifierOrKey originator)
throws CMSException, IOException
{
OriginatorPublicKey opk = originator.getOriginatorKey();
if (opk != null)
{
return getPublicKeyInfoFromOriginatorPublicKey(recKeyAlgId, opk);
}
OriginatorId origID;
IssuerAndSerialNumber iAndSN = originator.getIssuerAndSerialNumber();
if (iAndSN != null)
{
origID = new OriginatorId(iAndSN.getName(), iAndSN.getSerialNumber().getValue());
}
else
{
SubjectKeyIdentifier ski = originator.getSubjectKeyIdentifier();
origID = new OriginatorId(ski.getKeyIdentifier());
}
return getPublicKeyInfoFromOriginatorId(origID);
}
private SubjectPublicKeyInfo getPublicKeyInfoFromOriginatorPublicKey(AlgorithmIdentifier recKeyAlgId,
OriginatorPublicKey originatorPublicKey)
{
SubjectPublicKeyInfo pubInfo = new SubjectPublicKeyInfo(
recKeyAlgId,
originatorPublicKey.getPublicKey().getBytes());
return pubInfo;
}
private SubjectPublicKeyInfo getPublicKeyInfoFromOriginatorId(OriginatorId origID)
throws CMSException
{
// TODO Support all alternatives for OriginatorIdentifierOrKey
// see RFC 3852 6.2.2
throw new CMSException("No support for 'originator' as IssuerAndSerialNumber or SubjectKeyIdentifier");
}
protected RecipientOperator getRecipientOperator(Recipient recipient)
throws CMSException, IOException
{
KeyAgreeRecipient agreeRecipient = (KeyAgreeRecipient)recipient;
AlgorithmIdentifier recKeyAlgId = agreeRecipient.getPrivateKeyAlgorithmIdentifier();
return ((KeyAgreeRecipient)recipient).getRecipientOperator(keyEncAlg, messageAlgorithm, getSenderPublicKeyInfo(recKeyAlgId,
info.getOriginator()), info.getUserKeyingMaterial(), encryptedKey.getOctets());
}
}
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