1 files changed, 13 insertions, 0 deletions
diff --git a/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/DigestDerivationFunction.java b/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/DigestDerivationFunction.java
new file mode 100644
index 000000000..7ed0fe15d
--- /dev/null
+++ b/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/DigestDerivationFunction.java
@@ -0,0 +1,13 @@
+package org.spongycastle.crypto;
+
+/**
+ * base interface for general purpose Digest based byte derivation functions.
+ */
+public interface DigestDerivationFunction
+    extends DerivationFunction
+{
+    /**
+     * return the message digest used as the basis for the function
+     */
+    public Digest getDigest();
+}