1 files changed, 93 insertions, 0 deletions
diff --git a/crypto/src/asn1/ess/ESSCertID.cs b/crypto/src/asn1/ess/ESSCertID.cs
new file mode 100644
index 000000000..4d449a746
--- /dev/null
+++ b/crypto/src/asn1/ess/ESSCertID.cs
@@ -0,0 +1,93 @@
+using System;
+
+using Org.BouncyCastle.Asn1.X509;
+
+namespace Org.BouncyCastle.Asn1.Ess
+{
+	public class EssCertID
+		: Asn1Encodable
+	{
+		private Asn1OctetString certHash;
+		private IssuerSerial issuerSerial;
+
+		public static EssCertID GetInstance(
+			object o)
+		{
+			if (o == null || o is EssCertID)
+			{
+				return (EssCertID) o;
+			}
+
+			if (o is Asn1Sequence)
+			{
+				return new EssCertID((Asn1Sequence) o);
+			}
+
+			throw new ArgumentException(
+				"unknown object in 'EssCertID' factory : "
+				+ o.GetType().Name + ".");
+		}
+
+		/**
+		 * constructor
+		 */
+		public EssCertID(
+			Asn1Sequence seq)
+		{
+			if (seq.Count < 1 || seq.Count > 2)
+			{
+				throw new ArgumentException("Bad sequence size: " + seq.Count);
+			}
+
+			this.certHash = Asn1OctetString.GetInstance(seq[0]);
+
+			if (seq.Count > 1)
+			{
+				issuerSerial = IssuerSerial.GetInstance(seq[1]);
+			}
+		}
+
+		public EssCertID(
+			byte[] hash)
+		{
+			certHash = new DerOctetString(hash);
+		}
+
+		public EssCertID(
+			byte[]			hash,
+			IssuerSerial	issuerSerial)
+		{
+			this.certHash = new DerOctetString(hash);
+			this.issuerSerial = issuerSerial;
+		}
+
+		public byte[] GetCertHash()
+		{
+			return certHash.GetOctets();
+		}
+
+		public IssuerSerial IssuerSerial
+		{
+			get { return issuerSerial; }
+		}
+
+		/**
+		 * <pre>
+		 * EssCertID ::= SEQUENCE {
+		 *     certHash Hash,
+		 *     issuerSerial IssuerSerial OPTIONAL }
+		 * </pre>
+		 */
+		public override Asn1Object ToAsn1Object()
+		{
+			Asn1EncodableVector v = new Asn1EncodableVector(certHash);
+
+			if (issuerSerial != null)
+			{
+				v.Add(issuerSerial);
+			}
+
+			return new DerSequence(v);
+		}
+	}
+}