1 files changed, 89 insertions, 0 deletions
diff --git a/crypto/src/asn1/cms/SignerIdentifier.cs b/crypto/src/asn1/cms/SignerIdentifier.cs
new file mode 100644
index 000000000..5742cee75
--- /dev/null
+++ b/crypto/src/asn1/cms/SignerIdentifier.cs
@@ -0,0 +1,89 @@
+using System;
+
+using Org.BouncyCastle.Asn1;
+
+namespace Org.BouncyCastle.Asn1.Cms
+{
+    public class SignerIdentifier
+        : Asn1Encodable, IAsn1Choice
+    {
+        private Asn1Encodable id;
+
+		public SignerIdentifier(
+            IssuerAndSerialNumber id)
+        {
+            this.id = id;
+        }
+
+		public SignerIdentifier(
+            Asn1OctetString id)
+        {
+            this.id = new DerTaggedObject(false, 0, id);
+        }
+
+		public SignerIdentifier(
+            Asn1Object id)
+        {
+            this.id = id;
+        }
+
+		/**
+         * return a SignerIdentifier object from the given object.
+         *
+         * @param o the object we want converted.
+         * @exception ArgumentException if the object cannot be converted.
+         */
+        public static SignerIdentifier GetInstance(
+            object o)
+        {
+            if (o == null || o is SignerIdentifier)
+                return (SignerIdentifier) o;
+
+			if (o is IssuerAndSerialNumber)
+                return new SignerIdentifier((IssuerAndSerialNumber) o);
+
+			if (o is Asn1OctetString)
+                return new SignerIdentifier((Asn1OctetString) o);
+
+			if (o is Asn1Object)
+                return new SignerIdentifier((Asn1Object) o);
+
+			throw new ArgumentException(
+				"Illegal object in SignerIdentifier: " + o.GetType().Name);
+        }
+
+		public bool IsTagged
+		{
+			get { return (id is Asn1TaggedObject); }
+		}
+
+		public Asn1Encodable ID
+        {
+            get
+            {
+                if (id is Asn1TaggedObject)
+                {
+                    return Asn1OctetString.GetInstance((Asn1TaggedObject)id, false);
+                }
+
+				return id;
+            }
+        }
+
+		/**
+         * Produce an object suitable for an Asn1OutputStream.
+         * <pre>
+         * SignerIdentifier ::= CHOICE {
+         *     issuerAndSerialNumber IssuerAndSerialNumber,
+         *     subjectKeyIdentifier [0] SubjectKeyIdentifier
+         * }
+         *
+         * SubjectKeyIdentifier ::= OCTET STRING
+         * </pre>
+         */
+        public override Asn1Object ToAsn1Object()
+        {
+            return id.ToAsn1Object();
+        }
+    }
+}