1 files changed, 123 insertions, 0 deletions
diff --git a/libraries/spongycastle/prov/src/main/java/org/spongycastle/pqc/jcajce/spec/RainbowParameterSpec.java b/libraries/spongycastle/prov/src/main/java/org/spongycastle/pqc/jcajce/spec/RainbowParameterSpec.java
new file mode 100644
index 000000000..936c00462
--- /dev/null
+++ b/libraries/spongycastle/prov/src/main/java/org/spongycastle/pqc/jcajce/spec/RainbowParameterSpec.java
@@ -0,0 +1,123 @@
+package org.spongycastle.pqc.jcajce.spec;
+
+import java.security.spec.AlgorithmParameterSpec;
+
+import org.spongycastle.util.Arrays;
+
+/**
+ * This class provides methods for setting and getting the Rainbow-parameters
+ * like number of Vinegar-variables in the layers, number of layers and so on.
+ * <p/>
+ * More detailed information about the needed parameters for the Rainbow
+ * Signature Scheme is to be found in the paper of Jintai Ding, Dieter Schmidt:
+ * Rainbow, a New Multivariable Polynomial Signature Scheme. ACNS 2005: 164-175
+ * (http://dx.doi.org/10.1007/11496137_12)
+ */
+public class RainbowParameterSpec
+    implements AlgorithmParameterSpec
+{
+
+    /**
+     * DEFAULT PARAMS
+     */
+    /*
+      * Vi = vinegars per layer whereas n is vu (vu = 33 = n) such that
+      *
+      * v1 = 6; o1 = 12-6 = 6
+      *
+      * v2 = 12; o2 = 17-12 = 5
+      *
+      * v3 = 17; o3 = 22-17 = 5
+      *
+      * v4 = 22; o4 = 33-22 = 11
+      *
+      * v5 = 33; (o5 = 0)
+      */
+    private static final int[] DEFAULT_VI = {6, 12, 17, 22, 33};
+
+    private int[] vi;// set of vinegar vars per layer.
+
+    /**
+     * Default Constructor The elements of the array containing the number of
+     * Vinegar variables in each layer are set to the default values here.
+     */
+    public RainbowParameterSpec()
+    {
+        this.vi = DEFAULT_VI;
+    }
+
+    /**
+     * Constructor with parameters
+     *
+     * @param vi The elements of the array containing the number of Vinegar
+     *           variables per layer are set to the values of the input array.
+     * @throws IllegalArgumentException if the variables are invalid.
+     */
+    public RainbowParameterSpec(int[] vi)
+    {
+        this.vi = vi;
+        try
+        {
+            checkParams();
+        }
+        catch (Exception e)
+        {
+            e.printStackTrace();
+        }
+    }
+
+    private void checkParams()
+        throws Exception
+    {
+        if (vi == null)
+        {
+            throw new IllegalArgumentException("no layers defined.");
+        }
+        if (vi.length > 1)
+        {
+            for (int i = 0; i < vi.length - 1; i++)
+            {
+                if (vi[i] >= vi[i + 1])
+                {
+                    throw new IllegalArgumentException(
+                        "v[i] has to be smaller than v[i+1]");
+                }
+            }
+        }
+        else
+        {
+            throw new IllegalArgumentException(
+                "Rainbow needs at least 1 layer, such that v1 < v2.");
+        }
+    }
+
+    /**
+     * Getter for the number of layers
+     *
+     * @return the number of layers
+     */
+    public int getNumOfLayers()
+    {
+        return this.vi.length - 1;
+    }
+
+    /**
+     * Getter for the number of all the polynomials in Rainbow
+     *
+     * @return the number of the polynomials
+     */
+    public int getDocumentLength()
+    {
+        return vi[vi.length - 1] - vi[0];
+    }
+
+    /**
+     * Getter for the array containing the number of Vinegar-variables per layer
+     *
+     * @return the numbers of vinegars per layer
+     */
+    public int[] getVi()
+    {
+        return Arrays.clone(this.vi);
+    }
+}