1 files changed, 48 insertions, 0 deletions
diff --git a/core/src/main/java/org/bouncycastle/crypto/digests/NullDigest.java b/core/src/main/java/org/bouncycastle/crypto/digests/NullDigest.java
new file mode 100644
index 00000000..6cb0d4ac
--- /dev/null
+++ b/core/src/main/java/org/bouncycastle/crypto/digests/NullDigest.java
@@ -0,0 +1,48 @@
+package org.bouncycastle.crypto.digests;
+
+import java.io.ByteArrayOutputStream;
+
+import org.bouncycastle.crypto.Digest;
+
+
+public class NullDigest
+    implements Digest
+{
+    private ByteArrayOutputStream bOut = new ByteArrayOutputStream();
+
+    public String getAlgorithmName()
+    {
+        return "NULL";
+    }
+
+    public int getDigestSize()
+    {
+        return bOut.size();
+    }
+
+    public void update(byte in)
+    {
+        bOut.write(in);
+    }
+
+    public void update(byte[] in, int inOff, int len)
+    {
+        bOut.write(in, inOff, len);
+    }
+
+    public int doFinal(byte[] out, int outOff)
+    {
+        byte[] res = bOut.toByteArray();
+
+        System.arraycopy(res, 0, out, outOff, res.length);
+
+        reset();
+        
+        return res.length;
+    }
+
+    public void reset()
+    {
+        bOut.reset();
+    }
+}
+\ No newline at end of file