1 files changed, 58 insertions, 0 deletions
diff --git a/crypto/src/asn1/x9/KeySpecificInfo.cs b/crypto/src/asn1/x9/KeySpecificInfo.cs
new file mode 100644
index 000000000..46298646b
--- /dev/null
+++ b/crypto/src/asn1/x9/KeySpecificInfo.cs
@@ -0,0 +1,58 @@
+using System.Collections;
+
+namespace Org.BouncyCastle.Asn1.X9
+{
+    /**
+     * ASN.1 def for Diffie-Hellman key exchange KeySpecificInfo structure. See
+     * RFC 2631, or X9.42, for further details.
+     */
+    public class KeySpecificInfo
+        : Asn1Encodable
+    {
+        private DerObjectIdentifier	algorithm;
+        private Asn1OctetString		counter;
+
+		public KeySpecificInfo(
+            DerObjectIdentifier	algorithm,
+            Asn1OctetString		counter)
+        {
+            this.algorithm = algorithm;
+            this.counter = counter;
+        }
+
+		public KeySpecificInfo(
+            Asn1Sequence seq)
+        {
+            IEnumerator e = seq.GetEnumerator();
+
+			e.MoveNext();
+            algorithm = (DerObjectIdentifier)e.Current;
+            e.MoveNext();
+            counter = (Asn1OctetString)e.Current;
+        }
+
+		public DerObjectIdentifier Algorithm
+        {
+            get { return algorithm; }
+        }
+
+		public Asn1OctetString Counter
+        {
+            get { return counter; }
+        }
+
+		/**
+         * Produce an object suitable for an Asn1OutputStream.
+         * <pre>
+         *  KeySpecificInfo ::= Sequence {
+         *      algorithm OBJECT IDENTIFIER,
+         *      counter OCTET STRING SIZE (4..4)
+         *  }
+         * </pre>
+         */
+        public override Asn1Object ToAsn1Object()
+        {
+			return new DerSequence(algorithm, counter);
+        }
+    }
+}