using System; using System.Collections.Generic; using Org.BouncyCastle.Utilities; namespace Org.BouncyCastle.Asn1.X509 { /** * The extendedKeyUsage object. *
     *      extendedKeyUsage ::= Sequence SIZE (1..MAX) OF KeyPurposeId
     * 
*/ public class ExtendedKeyUsage : Asn1Encodable { public static ExtendedKeyUsage GetInstance( Asn1TaggedObject obj, bool explicitly) { return GetInstance(Asn1Sequence.GetInstance(obj, explicitly)); } public static ExtendedKeyUsage GetInstance( object obj) { if (obj is ExtendedKeyUsage) return (ExtendedKeyUsage)obj; if (obj is X509Extension) return GetInstance(X509Extension.ConvertValueToObject((X509Extension)obj)); if (obj == null) return null; return new ExtendedKeyUsage(Asn1Sequence.GetInstance(obj)); } public static ExtendedKeyUsage FromExtensions(X509Extensions extensions) { return GetInstance(X509Extensions.GetExtensionParsedValue(extensions, X509Extensions.ExtendedKeyUsage)); } internal readonly ISet m_usageTable = new HashSet(); internal readonly Asn1Sequence seq; private ExtendedKeyUsage(Asn1Sequence seq) { this.seq = seq; foreach (Asn1Encodable element in seq) { DerObjectIdentifier oid = DerObjectIdentifier.GetInstance(element); m_usageTable.Add(oid); } } public ExtendedKeyUsage(params KeyPurposeID[] usages) { this.seq = new DerSequence(usages); foreach (KeyPurposeID usage in usages) { m_usageTable.Add(usage); } } public ExtendedKeyUsage(IEnumerable usages) { Asn1EncodableVector v = new Asn1EncodableVector(); foreach (var oid in usages) { v.Add(oid); m_usageTable.Add(oid); } this.seq = new DerSequence(v); } public bool HasKeyPurposeId(KeyPurposeID keyPurposeId) { return m_usageTable.Contains(keyPurposeId); } /** * Returns all extended key usages. * The returned ArrayList contains DerObjectIdentifier instances. * @return An ArrayList with all key purposes. */ public IList GetAllUsages() { return new List(m_usageTable); } public int Count { get { return m_usageTable.Count; } } public override Asn1Object ToAsn1Object() { return seq; } } }