1 files changed, 49 insertions, 0 deletions
diff --git a/Crypto/src/crypto/digests/NullDigest.cs b/Crypto/src/crypto/digests/NullDigest.cs
new file mode 100644
index 000000000..e598cb145
--- /dev/null
+++ b/Crypto/src/crypto/digests/NullDigest.cs
@@ -0,0 +1,49 @@
+using System;
+using System.IO;
+
+namespace Org.BouncyCastle.Crypto.Digests
+{
+ public class NullDigest : IDigest
+ {
+ private readonly MemoryStream bOut = new MemoryStream();
+
+ public string AlgorithmName
+ {
+ get { return "NULL"; }
+ }
+
+ public int GetByteLength()
+ {
+ // TODO Is this okay?
+ return 0;
+ }
+
+ public int GetDigestSize()
+ {
+ return (int) bOut.Length;
+ }
+
+ public void Update(byte b)
+ {
+ bOut.WriteByte(b);
+ }
+
+ public void BlockUpdate(byte[] inBytes, int inOff, int len)
+ {
+ bOut.Write(inBytes, inOff, len);
+ }
+
+ public int DoFinal(byte[] outBytes, int outOff)
+ {
+ byte[] res = bOut.ToArray();
+ res.CopyTo(outBytes, outOff);
+ Reset();
+ return res.Length;
+ }
+
+ public void Reset()
+ {
+ bOut.SetLength(0);
+ }
+ }
+}
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