1 files changed, 25 insertions, 0 deletions
diff --git a/core/src/main/java/org/spongycastle/crypto/prng/EntropySource.java b/core/src/main/java/org/spongycastle/crypto/prng/EntropySource.java
new file mode 100644
index 00000000..783f375c
--- /dev/null
+++ b/core/src/main/java/org/spongycastle/crypto/prng/EntropySource.java
@@ -0,0 +1,25 @@
+package org.spongycastle.crypto.prng;
+
+public interface EntropySource
+{
+    /**
+     * Return whether or not this entropy source is regarded as prediction resistant.
+     *
+     * @return true if it is, false otherwise.
+     */
+    boolean isPredictionResistant();
+
+    /**
+     * Return a byte array of entropy.
+     *
+     * @return  entropy bytes.
+     */
+    byte[] getEntropy();
+
+    /**
+     * Return the number of bits of entropy this source can produce.
+     *
+     * @return size in bits of the return value of getEntropy.
+     */
+    int entropySize();
+}