1 files changed, 32 insertions, 0 deletions
diff --git a/libraries/spongycastle/prov/src/main/java/org/spongycastle/jcajce/provider/asymmetric/util/IESUtil.java b/libraries/spongycastle/prov/src/main/java/org/spongycastle/jcajce/provider/asymmetric/util/IESUtil.java
new file mode 100644
index 000000000..fb93838e6
--- /dev/null
+++ b/libraries/spongycastle/prov/src/main/java/org/spongycastle/jcajce/provider/asymmetric/util/IESUtil.java
@@ -0,0 +1,32 @@
+package org.spongycastle.jcajce.provider.asymmetric.util;
+
+import org.spongycastle.crypto.engines.IESEngine;
+import org.spongycastle.jce.spec.IESParameterSpec;
+
+public class IESUtil
+{
+    public static IESParameterSpec guessParameterSpec(IESEngine engine)
+    {
+        if (engine.getCipher() == null)
+        {
+            return new IESParameterSpec(null, null, 128);
+        }
+        else if (engine.getCipher().getUnderlyingCipher().getAlgorithmName().equals("DES") ||
+                engine.getCipher().getUnderlyingCipher().getAlgorithmName().equals("RC2") ||
+                engine.getCipher().getUnderlyingCipher().getAlgorithmName().equals("RC5-32") ||
+                engine.getCipher().getUnderlyingCipher().getAlgorithmName().equals("RC5-64"))
+        {
+            return new IESParameterSpec(null, null, 64, 64);
+        }
+        else if (engine.getCipher().getUnderlyingCipher().getAlgorithmName().equals("SKIPJACK"))
+        {
+            return new IESParameterSpec(null, null, 80, 80);
+        }
+        else if (engine.getCipher().getUnderlyingCipher().getAlgorithmName().equals("GOST28147"))
+        {
+            return new IESParameterSpec(null, null, 256, 256);
+        }
+
+        return new IESParameterSpec(null, null, 128, 128);
+    }
+}