1 files changed, 17 insertions, 0 deletions
diff --git a/core/src/main/java/org/bouncycastle/crypto/DerivationFunction.java b/core/src/main/java/org/bouncycastle/crypto/DerivationFunction.java
new file mode 100644
index 00000000..ef6e29eb
--- /dev/null
+++ b/core/src/main/java/org/bouncycastle/crypto/DerivationFunction.java
@@ -0,0 +1,17 @@
+package org.bouncycastle.crypto;
+
+/**
+ * base interface for general purpose byte derivation functions.
+ */
+public interface DerivationFunction
+{
+    public void init(DerivationParameters param);
+
+    /**
+     * return the message digest used as the basis for the function
+     */
+    public Digest getDigest();
+
+    public int generateBytes(byte[] out, int outOff, int len)
+        throws DataLengthException, IllegalArgumentException;
+}