1 files changed, 42 insertions, 0 deletions
diff --git a/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/io/MacOutputStream.java b/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/io/MacOutputStream.java
new file mode 100644
index 000000000..340b994eb
--- /dev/null
+++ b/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/io/MacOutputStream.java
@@ -0,0 +1,42 @@
+package org.spongycastle.crypto.io;
+
+import java.io.IOException;
+import java.io.OutputStream;
+
+import org.spongycastle.crypto.Mac;
+
+public class MacOutputStream
+    extends OutputStream
+{
+    protected Mac mac;
+
+    public MacOutputStream(
+        Mac          mac)
+    {
+        this.mac = mac;
+    }
+
+    public void write(int b)
+        throws IOException
+    {
+        mac.update((byte)b);
+    }
+
+    public void write(
+        byte[] b,
+        int off,
+        int len)
+        throws IOException
+    {
+        mac.update(b, off, len);
+    }
+
+    public byte[] getMac()
+    {
+        byte[] res = new byte[mac.getMacSize()];
+
+        mac.doFinal(res, 0);
+
+        return res;
+    }
+}