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using System;
using System.Collections.Generic;
using Org.BouncyCastle.Asn1.Misc;
using Org.BouncyCastle.Asn1.Nist;
using Org.BouncyCastle.Asn1.Oiw;
using Org.BouncyCastle.Asn1.Pkcs;
using Org.BouncyCastle.Asn1.X509;
namespace Org.BouncyCastle.Asn1.Smime
{
/**
* Handler class for dealing with S/MIME Capabilities
*/
public class SmimeCapabilities
: Asn1Encodable
{
/**
* general preferences
*/
public static readonly DerObjectIdentifier PreferSignedData = PkcsObjectIdentifiers.PreferSignedData;
public static readonly DerObjectIdentifier CannotDecryptAny = PkcsObjectIdentifiers.CannotDecryptAny;
public static readonly DerObjectIdentifier SmimeCapabilitesVersions = PkcsObjectIdentifiers.SmimeCapabilitiesVersions;
/**
* encryption algorithms preferences
*/
public static readonly DerObjectIdentifier Aes256Cbc = NistObjectIdentifiers.IdAes256Cbc;
public static readonly DerObjectIdentifier Aes192Cbc = NistObjectIdentifiers.IdAes192Cbc;
public static readonly DerObjectIdentifier Aes128Cbc = NistObjectIdentifiers.IdAes128Cbc;
public static readonly DerObjectIdentifier IdeaCbc = MiscObjectIdentifiers.as_sys_sec_alg_ideaCBC;
public static readonly DerObjectIdentifier Cast5Cbc = MiscObjectIdentifiers.cast5CBC;
public static readonly DerObjectIdentifier DesCbc = OiwObjectIdentifiers.DesCbc;
public static readonly DerObjectIdentifier DesEde3Cbc = PkcsObjectIdentifiers.DesEde3Cbc;
public static readonly DerObjectIdentifier RC2Cbc = PkcsObjectIdentifiers.RC2Cbc;
public static SmimeCapabilities GetInstance(object obj)
{
if (obj == null)
return null;
if (obj is SmimeCapabilities smimeCapabilities)
return smimeCapabilities;
// TODO[api] Remove this handler
if (obj is AttributeX509 attributeX509)
return new SmimeCapabilities((Asn1Sequence)attributeX509.AttrValues[0]);
return new SmimeCapabilities(Asn1Sequence.GetInstance(obj));
}
public static SmimeCapabilities GetInstance(Asn1TaggedObject taggedObject, bool declaredExplicit) =>
new SmimeCapabilities(Asn1Sequence.GetInstance(taggedObject, declaredExplicit));
public static SmimeCapabilities GetTagged(Asn1TaggedObject taggedObject, bool declaredExplicit) =>
new SmimeCapabilities(Asn1Sequence.GetTagged(taggedObject, declaredExplicit));
private readonly Asn1Sequence m_capabilities;
public SmimeCapabilities(Asn1Sequence seq)
{
m_capabilities = seq ?? throw new ArgumentNullException(nameof(seq));
}
/**
* returns an ArrayList with 0 or more objects of all the capabilities
* matching the passed in capability Oid. If the Oid passed is null the
* entire set is returned.
*/
public IList<SmimeCapability> GetCapabilitiesForOid(DerObjectIdentifier capability)
{
var list = new List<SmimeCapability>();
DoGetCapabilitiesForOid(capability, list);
return list;
}
private void DoGetCapabilitiesForOid(DerObjectIdentifier capability, List<SmimeCapability> list)
{
foreach (var element in m_capabilities)
{
SmimeCapability smimeCapability = SmimeCapability.GetInstance(element);
if (smimeCapability.CapabilityID.Equals(capability))
{
list.Add(smimeCapability);
}
}
}
/**
* Produce an object suitable for an Asn1OutputStream.
* <pre>
* SMIMECapabilities ::= Sequence OF SMIMECapability
* </pre>
*/
public override Asn1Object ToAsn1Object() => m_capabilities;
}
}
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