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using System;
using Org.BouncyCastle.Asn1.X509;
namespace Org.BouncyCastle.Asn1.Cms
{
/**
* KEMRecipientInfo ::= SEQUENCE {
* version CMSVersion, -- always set to 0
* rid RecipientIdentifier,
* kem KEMAlgorithmIdentifier,
* kemct OCTET STRING,
* kdf KeyDerivationAlgorithmIdentifier,
* kekLength INTEGER (1..MAX),
* ukm [0] EXPLICIT UserKeyingMaterial OPTIONAL,
* wrap KeyEncryptionAlgorithmIdentifier,
* encryptedKey EncryptedKey }
*/
public sealed class KemRecipientInfo
: Asn1Encodable
{
public static KemRecipientInfo GetInstance(object obj)
{
if (obj == null)
return null;
if (obj is KemRecipientInfo kemRecipientInfo)
return kemRecipientInfo;
return new KemRecipientInfo(Asn1Sequence.GetInstance(obj));
}
public static KemRecipientInfo GetInstance(Asn1TaggedObject taggedObject, bool declaredExplicit)
{
return new KemRecipientInfo(Asn1Sequence.GetInstance(taggedObject, declaredExplicit));
}
private static readonly DerInteger V1 = DerInteger.Zero;
private readonly DerInteger m_cmsVersion;
private readonly RecipientIdentifier m_rid;
private readonly AlgorithmIdentifier m_kem;
private readonly Asn1OctetString m_kemct;
private readonly AlgorithmIdentifier m_kdf;
private readonly DerInteger m_kekLength;
private readonly Asn1OctetString m_ukm;
private readonly AlgorithmIdentifier m_wrap;
private readonly Asn1OctetString m_encryptedKey;
public KemRecipientInfo(RecipientIdentifier rid, AlgorithmIdentifier kem, Asn1OctetString kemct,
AlgorithmIdentifier kdf, DerInteger kekLength, Asn1OctetString ukm, AlgorithmIdentifier wrap,
Asn1OctetString encryptedKey)
{
m_cmsVersion = V1;
m_rid = rid ?? throw new ArgumentNullException(nameof(rid));
m_kem = kem ?? throw new ArgumentNullException(nameof(kem));
m_kemct = kemct ?? throw new ArgumentNullException(nameof(kemct));
m_kdf = kdf ?? throw new ArgumentNullException(nameof(kdf));
m_kekLength = kekLength ?? throw new ArgumentNullException(nameof(kekLength));
m_ukm = ukm;
m_wrap = wrap ?? throw new ArgumentNullException(nameof(wrap));
m_encryptedKey = encryptedKey ?? throw new ArgumentNullException(nameof(encryptedKey));
}
private KemRecipientInfo(Asn1Sequence seq)
{
int count = seq.Count, pos = 0;
if (count < 8 || count > 9)
throw new ArgumentException("Bad sequence size: " + count, nameof(seq));
m_cmsVersion = DerInteger.GetInstance(seq[pos++]);
m_rid = RecipientIdentifier.GetInstance(seq[pos++]);
m_kem = AlgorithmIdentifier.GetInstance(seq[pos++]);
m_kemct = Asn1OctetString.GetInstance(seq[pos++]);
m_kdf = AlgorithmIdentifier.GetInstance(seq[pos++]);
m_kekLength = DerInteger.GetInstance(seq[pos++]);
m_ukm = Asn1Utilities.ReadOptionalContextTagged(seq, ref pos, 0, true, Asn1OctetString.GetInstance);
m_wrap = AlgorithmIdentifier.GetInstance(seq[pos++]);
m_encryptedKey = Asn1OctetString.GetInstance(seq[pos++]);
if (pos != count)
throw new ArgumentException("Unexpected elements in sequence", nameof(seq));
if (!m_cmsVersion.HasValue(0))
throw new ArgumentException("Unsupported version (hex): " + m_cmsVersion.Value.ToString(16));
}
public RecipientIdentifier RecipientIdentifier => m_rid;
public AlgorithmIdentifier Kem => m_kem;
public Asn1OctetString Kemct => m_kemct;
public AlgorithmIdentifier Kdf => m_kdf;
public AlgorithmIdentifier Wrap => m_wrap;
public Asn1OctetString Ukm => m_ukm;
public Asn1OctetString EncryptedKey => m_encryptedKey;
public override Asn1Object ToAsn1Object()
{
Asn1EncodableVector v = new Asn1EncodableVector(9);
v.Add(m_cmsVersion, m_rid, m_kem, m_kemct, m_kdf, m_kekLength);
v.AddOptionalTagged(true, 0, m_ukm);
v.Add(m_wrap, m_encryptedKey);
return new DerSequence(v);
}
}
}
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