1 files changed, 46 insertions, 0 deletions
diff --git a/libraries/spongycastle/core/src/test/java/org/spongycastle/crypto/prng/test/TestEntropySourceProvider.java b/libraries/spongycastle/core/src/test/java/org/spongycastle/crypto/prng/test/TestEntropySourceProvider.java
new file mode 100644
index 000000000..d630f4c97
--- /dev/null
+++ b/libraries/spongycastle/core/src/test/java/org/spongycastle/crypto/prng/test/TestEntropySourceProvider.java
@@ -0,0 +1,46 @@
+package org.spongycastle.crypto.prng.test;
+
+import org.spongycastle.crypto.prng.EntropySource;
+import org.spongycastle.crypto.prng.EntropySourceProvider;
+
+public class TestEntropySourceProvider
+    implements EntropySourceProvider
+{
+    private final byte[] data;
+    private final boolean isPredictionResistant;
+
+    protected TestEntropySourceProvider(byte[] data, boolean isPredictionResistant)
+    {
+        this.data = data;
+        this.isPredictionResistant = isPredictionResistant;
+    }
+
+    public EntropySource get(final int bitsRequired)
+    {
+        return new EntropySource()
+        {
+            int index = 0;
+
+            public boolean isPredictionResistant()
+            {
+                return isPredictionResistant;
+            }
+
+            public byte[] getEntropy()
+            {
+                byte[] rv = new byte[bitsRequired / 8];
+
+                System.arraycopy(data, index, rv, 0, rv.length);
+
+                index += bitsRequired / 8;
+
+                return rv;
+            }
+
+            public int entropySize()
+            {
+                return bitsRequired;
+            }
+        };
+    }
+}