1 files changed, 58 insertions, 0 deletions
diff --git a/crypto/src/cms/RecipientId.cs b/crypto/src/cms/RecipientId.cs
new file mode 100644
index 000000000..9b6eb093b
--- /dev/null
+++ b/crypto/src/cms/RecipientId.cs
@@ -0,0 +1,58 @@
+using System;
+
+using Org.BouncyCastle.Asn1.X509;
+using Org.BouncyCastle.Math;
+using Org.BouncyCastle.Utilities;
+using Org.BouncyCastle.X509.Store;
+
+namespace Org.BouncyCastle.Cms
+{
+    public class RecipientID
+        : X509CertStoreSelector
+    {
+        private byte[] keyIdentifier;
+
+		public byte[] KeyIdentifier
+		{
+			get { return Arrays.Clone(keyIdentifier); }
+			set { keyIdentifier = Arrays.Clone(value); }
+		}
+
+		public override int GetHashCode()
+        {
+            int code = Arrays.GetHashCode(keyIdentifier)
+				^ Arrays.GetHashCode(this.SubjectKeyIdentifier);
+
+			BigInteger serialNumber = this.SerialNumber;
+			if (serialNumber != null)
+            {
+                code ^= serialNumber.GetHashCode();
+            }
+
+			X509Name issuer = this.Issuer;
+            if (issuer != null)
+            {
+                code ^= issuer.GetHashCode();
+            }
+
+            return code;
+        }
+
+        public override bool Equals(
+            object obj)
+        {
+			if (obj == this)
+				return true;
+
+			RecipientID id = obj as RecipientID;
+
+			if (id == null)
+				return false;
+
+			return Arrays.AreEqual(keyIdentifier, id.keyIdentifier)
+				&& Arrays.AreEqual(SubjectKeyIdentifier, id.SubjectKeyIdentifier)
+				&& Platform.Equals(SerialNumber, id.SerialNumber)
+				&& IssuersMatch(Issuer, id.Issuer);
+        }
+    }
+}