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//------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//------------------------------------------------------------
namespace System.IdentityModel.Tokens
{
using System.Globalization;
using System.Security.Cryptography.X509Certificates;
public class X509SubjectKeyIdentifierClause : BinaryKeyIdentifierClause
{
const string SubjectKeyIdentifierOid = "2.5.29.14";
const int SkiDataOffset = 2;
public X509SubjectKeyIdentifierClause(byte[] ski)
: this(ski, true)
{
}
internal X509SubjectKeyIdentifierClause(byte[] ski, bool cloneBuffer)
: base(null, ski, cloneBuffer)
{
}
static byte[] GetSkiRawData(X509Certificate2 certificate)
{
if (certificate == null)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("certificate");
X509SubjectKeyIdentifierExtension skiExtension =
certificate.Extensions[SubjectKeyIdentifierOid] as X509SubjectKeyIdentifierExtension;
if (skiExtension != null)
{
return skiExtension.RawData;
}
else
{
return null;
}
}
public byte[] GetX509SubjectKeyIdentifier()
{
return GetBuffer();
}
public bool Matches(X509Certificate2 certificate)
{
if (certificate == null)
return false;
byte[] data = GetSkiRawData(certificate);
return data != null && Matches(data, SkiDataOffset);
}
public static bool TryCreateFrom(X509Certificate2 certificate, out X509SubjectKeyIdentifierClause keyIdentifierClause)
{
byte[] data = GetSkiRawData(certificate);
keyIdentifierClause = null;
if (data != null)
{
byte[] ski = SecurityUtils.CloneBuffer(data, SkiDataOffset, data.Length - SkiDataOffset);
keyIdentifierClause = new X509SubjectKeyIdentifierClause(ski, false);
}
return keyIdentifierClause != null;
}
public static bool CanCreateFrom(X509Certificate2 certificate)
{
return null != GetSkiRawData(certificate);
}
public override string ToString()
{
return string.Format(CultureInfo.InvariantCulture, "X509SubjectKeyIdentifierClause(SKI = 0x{0})", ToHexString());
}
}
}
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