SubjectKeyIdentifier
using Org.BouncyCastle.Asn1.Oiw;
using Org.BouncyCastle.Security;
using Org.BouncyCastle.Utilities;
using System;
namespace Org.BouncyCastle.Asn1.X509
{
public class SubjectKeyIdentifier : Asn1Encodable
{
private readonly byte[] m_keyIdentifier;
public static SubjectKeyIdentifier GetInstance(object obj)
{
if (obj == null)
return null;
SubjectKeyIdentifier subjectKeyIdentifier = obj as SubjectKeyIdentifier;
if (subjectKeyIdentifier != null)
return subjectKeyIdentifier;
SubjectPublicKeyInfo subjectPublicKeyInfo = obj as SubjectPublicKeyInfo;
if (subjectPublicKeyInfo != null)
return new SubjectKeyIdentifier(subjectPublicKeyInfo);
X509Extension x509Extension = obj as X509Extension;
if (x509Extension != null)
return GetInstance(X509Extension.ConvertValueToObject(x509Extension));
return new SubjectKeyIdentifier(Asn1OctetString.GetInstance(obj));
}
public static SubjectKeyIdentifier GetInstance(Asn1TaggedObject obj, bool explicitly)
{
return new SubjectKeyIdentifier(Asn1OctetString.GetInstance(obj, explicitly));
}
public static SubjectKeyIdentifier GetTagged(Asn1TaggedObject taggedObject, bool declaredExplicit)
{
return new SubjectKeyIdentifier(Asn1OctetString.GetTagged(taggedObject, declaredExplicit));
}
public static SubjectKeyIdentifier FromExtensions(X509Extensions extensions)
{
return GetInstance(X509Extensions.GetExtensionParsedValue(extensions, X509Extensions.SubjectKeyIdentifier));
}
public SubjectKeyIdentifier(byte[] keyID)
{
if (keyID == null)
throw new ArgumentNullException("keyID");
m_keyIdentifier = Arrays.Clone(keyID);
}
public SubjectKeyIdentifier(Asn1OctetString keyID)
: this(keyID.GetOctets())
{
}
[Obsolete("Use 'X509ExtensionUtilities' methods instead")]
public SubjectKeyIdentifier(SubjectPublicKeyInfo spki)
{
m_keyIdentifier = GetDigest(spki);
}
public byte[] GetKeyIdentifier()
{
return Arrays.Clone(m_keyIdentifier);
}
public override Asn1Object ToAsn1Object()
{
return DerOctetString.FromContents(m_keyIdentifier);
}
[Obsolete("Use 'X509ExtensionUtilities' methods instead")]
public static SubjectKeyIdentifier CreateSha1KeyIdentifier(SubjectPublicKeyInfo keyInfo)
{
return new SubjectKeyIdentifier(keyInfo);
}
[Obsolete("Use 'X509ExtensionUtilities' methods instead")]
public static SubjectKeyIdentifier CreateTruncatedSha1KeyIdentifier(SubjectPublicKeyInfo keyInfo)
{
byte[] digest = GetDigest(keyInfo);
byte[] array = new byte[8];
Array.Copy(digest, digest.Length - 8, array, 0, array.Length);
array[0] &= 15;
array[0] |= 64;
return new SubjectKeyIdentifier(array);
}
private static byte[] GetDigest(SubjectPublicKeyInfo spki)
{
return DigestUtilities.CalculateDigest(OiwObjectIdentifiers.IdSha1, spki.PublicKey.GetBytes());
}
}
}