1 files changed, 64 insertions, 0 deletions
diff --git a/crypto/src/asn1/esf/SignaturePolicyIdentifier.cs b/crypto/src/asn1/esf/SignaturePolicyIdentifier.cs
new file mode 100644
index 000000000..3a639f444
--- /dev/null
+++ b/crypto/src/asn1/esf/SignaturePolicyIdentifier.cs
@@ -0,0 +1,64 @@
+using System;
+
+namespace Org.BouncyCastle.Asn1.Esf
+{
+	/// <remarks>
+	/// <code>
+	/// SignaturePolicyIdentifier ::= CHOICE {
+	///		SignaturePolicyId		SignaturePolicyId,
+	///		SignaturePolicyImplied	SignaturePolicyImplied
+	/// }
+	/// 
+	/// SignaturePolicyImplied ::= NULL
+	/// </code>
+	/// </remarks>
+	public class SignaturePolicyIdentifier
+		: Asn1Encodable, IAsn1Choice
+	{
+		private readonly SignaturePolicyId sigPolicy;
+
+		public static SignaturePolicyIdentifier GetInstance(
+			object obj)
+		{
+			if (obj == null || obj is SignaturePolicyIdentifier)
+				return (SignaturePolicyIdentifier) obj;
+
+			if (obj is SignaturePolicyId)
+				return new SignaturePolicyIdentifier((SignaturePolicyId) obj);
+
+			if (obj is Asn1Null)
+				return new SignaturePolicyIdentifier();
+
+			throw new ArgumentException(
+				"Unknown object in 'SignaturePolicyIdentifier' factory: "
+					+ obj.GetType().Name,
+				"obj");
+		}
+
+		public SignaturePolicyIdentifier()
+		{
+			this.sigPolicy = null;
+		}
+
+		public SignaturePolicyIdentifier(
+			SignaturePolicyId signaturePolicyId)
+		{
+			if (signaturePolicyId == null)
+				throw new ArgumentNullException("signaturePolicyId");
+
+			this.sigPolicy = signaturePolicyId;
+		}
+
+		public SignaturePolicyId SignaturePolicyId
+		{
+			get { return sigPolicy; }
+		}
+
+		public override Asn1Object ToAsn1Object()
+		{
+			return sigPolicy == null
+				?	DerNull.Instance
+				:	sigPolicy.ToAsn1Object();
+		}
+	}
+}