1 files changed, 49 insertions, 0 deletions
diff --git a/prov/src/main/java/org/spongycastle/pqc/jcajce/provider/rainbow/RainbowKeysToParams.java b/prov/src/main/java/org/spongycastle/pqc/jcajce/provider/rainbow/RainbowKeysToParams.java
new file mode 100644
index 00000000..0ae006ef
--- /dev/null
+++ b/prov/src/main/java/org/spongycastle/pqc/jcajce/provider/rainbow/RainbowKeysToParams.java
@@ -0,0 +1,49 @@
+package org.spongycastle.pqc.jcajce.provider.rainbow;
+
+import java.security.InvalidKeyException;
+import java.security.PrivateKey;
+import java.security.PublicKey;
+
+import org.spongycastle.crypto.params.AsymmetricKeyParameter;
+import org.spongycastle.pqc.crypto.rainbow.RainbowPrivateKeyParameters;
+import org.spongycastle.pqc.crypto.rainbow.RainbowPublicKeyParameters;
+
+
+/**
+ * utility class for converting jce/jca Rainbow objects
+ * objects into their org.spongycastle.crypto counterparts.
+ */
+
+public class RainbowKeysToParams
+{
+    static public AsymmetricKeyParameter generatePublicKeyParameter(
+        PublicKey key)
+        throws InvalidKeyException
+    {
+        if (key instanceof BCRainbowPublicKey)
+        {
+            BCRainbowPublicKey k = (BCRainbowPublicKey)key;
+
+            return new RainbowPublicKeyParameters(k.getDocLength(), k.getCoeffQuadratic(),
+                k.getCoeffSingular(), k.getCoeffScalar());
+        }
+
+        throw new InvalidKeyException("can't identify Rainbow public key: " + key.getClass().getName());
+    }
+
+    static public AsymmetricKeyParameter generatePrivateKeyParameter(
+        PrivateKey key)
+        throws InvalidKeyException
+    {
+        if (key instanceof BCRainbowPrivateKey)
+        {
+            BCRainbowPrivateKey k = (BCRainbowPrivateKey)key;
+            return new RainbowPrivateKeyParameters(k.getInvA1(), k.getB1(),
+                k.getInvA2(), k.getB2(), k.getVi(), k.getLayers());
+        }
+
+        throw new InvalidKeyException("can't identify Rainbow private key.");
+    }
+}
+
+