1 files changed, 34 insertions, 0 deletions
diff --git a/pkix/src/main/java/org/spongycastle/operator/MacCalculator.java b/pkix/src/main/java/org/spongycastle/operator/MacCalculator.java
new file mode 100644
index 00000000..df59ed65
--- /dev/null
+++ b/pkix/src/main/java/org/spongycastle/operator/MacCalculator.java
@@ -0,0 +1,34 @@
+package org.spongycastle.operator;
+
+import java.io.OutputStream;
+
+import org.spongycastle.asn1.x509.AlgorithmIdentifier;
+
+public interface MacCalculator
+{
+    AlgorithmIdentifier getAlgorithmIdentifier();
+
+    /**
+     * Returns a stream that will accept data for the purpose of calculating
+     * the MAC for later verification. Use org.spongycastle.util.io.TeeOutputStream if you want to accumulate
+     * the data on the fly as well.
+     *
+     * @return an OutputStream
+     */
+    OutputStream getOutputStream();
+
+    /**
+     * Return the calculated MAC based on what has been written to the stream.
+     *
+     * @return calculated MAC.
+     */
+    byte[] getMac();
+
+
+    /**
+     * Return the key used for calculating the MAC.
+     *
+     * @return the MAC key.
+     */
+    GenericKey getKey();
+}
+\ No newline at end of file