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using System;
using Org.BouncyCastle.Asn1.X509;
namespace Org.BouncyCastle.Asn1.Cms
{
public class KeyAgreeRecipientInfo
: Asn1Encodable
{
public static KeyAgreeRecipientInfo GetInstance(object obj)
{
if (obj == null)
return null;
if (obj is KeyAgreeRecipientInfo keyAgreeRecipientInfo)
return keyAgreeRecipientInfo;
#pragma warning disable CS0618 // Type or member is obsolete
return new KeyAgreeRecipientInfo(Asn1Sequence.GetInstance(obj));
#pragma warning restore CS0618 // Type or member is obsolete
}
public static KeyAgreeRecipientInfo GetInstance(Asn1TaggedObject obj, bool explicitly)
{
#pragma warning disable CS0618 // Type or member is obsolete
return new KeyAgreeRecipientInfo(Asn1Sequence.GetInstance(obj, explicitly));
#pragma warning restore CS0618 // Type or member is obsolete
}
private readonly DerInteger m_version;
private readonly OriginatorIdentifierOrKey m_originator;
private readonly Asn1OctetString m_ukm;
private readonly AlgorithmIdentifier m_keyEncryptionAlgorithm;
private readonly Asn1Sequence m_recipientEncryptedKeys;
public KeyAgreeRecipientInfo(OriginatorIdentifierOrKey originator, Asn1OctetString ukm,
AlgorithmIdentifier keyEncryptionAlgorithm, Asn1Sequence recipientEncryptedKeys)
{
m_version = DerInteger.Three;
m_originator = originator ?? throw new ArgumentNullException(nameof(originator));
m_ukm = ukm;
m_keyEncryptionAlgorithm = keyEncryptionAlgorithm ?? throw new ArgumentNullException(nameof(keyEncryptionAlgorithm));
m_recipientEncryptedKeys = recipientEncryptedKeys ?? throw new ArgumentNullException(nameof(recipientEncryptedKeys));
}
[Obsolete("Use 'GetInstance' instead")]
public KeyAgreeRecipientInfo(Asn1Sequence seq)
{
int count = seq.Count, pos = 0;
if (count < 4 || count > 5)
throw new ArgumentException("Bad sequence size: " + count, nameof(seq));
m_version = DerInteger.GetInstance(seq[pos++]);
m_originator = Asn1Utilities.ReadContextTagged(seq, ref pos, 0, true, OriginatorIdentifierOrKey.GetInstance);
m_ukm = Asn1Utilities.ReadOptionalContextTagged(seq, ref pos, 1, true, Asn1OctetString.GetInstance);
m_keyEncryptionAlgorithm = AlgorithmIdentifier.GetInstance(seq[pos++]);
m_recipientEncryptedKeys = Asn1Sequence.GetInstance(seq[pos++]);
if (pos != count)
throw new ArgumentException("Unexpected elements in sequence", nameof(seq));
}
public DerInteger Version => m_version;
public OriginatorIdentifierOrKey Originator => m_originator;
public Asn1OctetString UserKeyingMaterial => m_ukm;
public AlgorithmIdentifier KeyEncryptionAlgorithm => m_keyEncryptionAlgorithm;
public Asn1Sequence RecipientEncryptedKeys => m_recipientEncryptedKeys;
/**
* Produce an object suitable for an Asn1OutputStream.
* <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 override Asn1Object ToAsn1Object()
{
Asn1EncodableVector v = new Asn1EncodableVector(5);
v.Add(m_version, new DerTaggedObject(true, 0, m_originator));
v.AddOptionalTagged(true, 1, m_ukm);
v.Add(m_keyEncryptionAlgorithm, m_recipientEncryptedKeys);
return new DerSequence(v);
}
}
}
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