1 files changed, 62 insertions, 0 deletions
diff --git a/crypto/src/crypto/digests/NonMemoableDigest.cs b/crypto/src/crypto/digests/NonMemoableDigest.cs
new file mode 100644
index 000000000..02c49b887
--- /dev/null
+++ b/crypto/src/crypto/digests/NonMemoableDigest.cs
@@ -0,0 +1,62 @@
+using System;
+
+namespace Org.BouncyCastle.Crypto.Digests
+{
+    /**
+     * Wrapper removes exposure to the IMemoable interface on an IDigest implementation.
+     */
+    public class NonMemoableDigest
+        :   IDigest
+    {
+        protected readonly IDigest mBaseDigest;
+
+        /**
+         * Base constructor.
+         *
+         * @param baseDigest underlying digest to use.
+         * @exception IllegalArgumentException if baseDigest is null
+         */
+        public NonMemoableDigest(IDigest baseDigest)
+        {
+            if (baseDigest == null)
+                throw new ArgumentNullException("baseDigest");
+
+            this.mBaseDigest = baseDigest;
+        }
+
+        public virtual string AlgorithmName
+        {
+            get { return mBaseDigest.AlgorithmName; }
+        }
+
+        public virtual int GetDigestSize()
+        {
+            return mBaseDigest.GetDigestSize();
+        }
+
+        public virtual void Update(byte input)
+        {
+            mBaseDigest.Update(input);
+        }
+
+        public virtual void BlockUpdate(byte[] input, int inOff, int len)
+        {
+            mBaseDigest.BlockUpdate(input, inOff, len);
+        }
+
+        public virtual int DoFinal(byte[] output, int outOff)
+        {
+            return mBaseDigest.DoFinal(output, outOff);
+        }
+
+        public virtual void Reset()
+        {
+            mBaseDigest.Reset();
+        }
+
+        public virtual int GetByteLength()
+        {
+            return mBaseDigest.GetByteLength();
+        }
+    }
+}