1 files changed, 73 insertions, 0 deletions
diff --git a/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/paddings/ZeroBytePadding.java b/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/paddings/ZeroBytePadding.java
new file mode 100644
index 000000000..53c805999
--- /dev/null
+++ b/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/paddings/ZeroBytePadding.java
@@ -0,0 +1,73 @@
+package org.spongycastle.crypto.paddings;
+
+import java.security.SecureRandom;
+
+import org.spongycastle.crypto.InvalidCipherTextException;
+
+/**
+ * A padder that adds NULL byte padding to a block.
+ */
+public class ZeroBytePadding
+    implements BlockCipherPadding
+{
+    /**
+     * Initialise the padder.
+     *
+     * @param random - a SecureRandom if available.
+     */
+    public void init(SecureRandom random)
+        throws IllegalArgumentException
+    {
+        // nothing to do.
+    }
+
+    /**
+     * Return the name of the algorithm the padder implements.
+     *
+     * @return the name of the algorithm the padder implements.
+     */
+    public String getPaddingName()
+    {
+        return "ZeroByte";
+    }
+
+    /**
+     * add the pad bytes to the passed in block, returning the
+     * number of bytes added.
+     */
+    public int addPadding(
+        byte[]  in,
+        int     inOff)
+    {
+        int added = (in.length - inOff);
+
+        while (inOff < in.length)
+        {
+            in[inOff] = (byte) 0;
+            inOff++;
+        }
+
+        return added;
+    }
+
+    /**
+     * return the number of pad bytes present in the block.
+     */
+    public int padCount(byte[] in)
+        throws InvalidCipherTextException
+    {
+        int count = in.length;
+
+        while (count > 0)
+        {
+            if (in[count - 1] != 0)
+            {
+                break;
+            }
+
+            count--;
+        }
+
+        return in.length - count;
+    }
+}