1 files changed, 122 insertions, 0 deletions
diff --git a/libraries/spongycastle/prov/src/main/java/org/spongycastle/jce/spec/ECNamedCurveSpec.java b/libraries/spongycastle/prov/src/main/java/org/spongycastle/jce/spec/ECNamedCurveSpec.java
new file mode 100644
index 000000000..68b64a2a0
--- /dev/null
+++ b/libraries/spongycastle/prov/src/main/java/org/spongycastle/jce/spec/ECNamedCurveSpec.java
@@ -0,0 +1,122 @@
+package org.spongycastle.jce.spec;
+
+import java.math.BigInteger;
+import java.security.spec.ECFieldF2m;
+import java.security.spec.ECFieldFp;
+import java.security.spec.ECPoint;
+import java.security.spec.EllipticCurve;
+
+import org.spongycastle.math.ec.ECCurve;
+
+/**
+ * specification signifying that the curve parameters can also be
+ * referred to by name.
+ */
+public class ECNamedCurveSpec
+    extends java.security.spec.ECParameterSpec
+{
+    private String  name;
+
+    private static EllipticCurve convertCurve(
+        ECCurve  curve,
+        byte[]   seed)
+    {
+        if (curve instanceof ECCurve.Fp)
+        {
+            return new EllipticCurve(new ECFieldFp(((ECCurve.Fp)curve).getQ()), curve.getA().toBigInteger(), curve.getB().toBigInteger(), seed);
+        }
+        else
+        {
+            ECCurve.F2m curveF2m = (ECCurve.F2m)curve;
+            int ks[];
+            
+            if (curveF2m.isTrinomial())
+            {
+                ks = new int[] { curveF2m.getK1() };
+                
+                return new EllipticCurve(new ECFieldF2m(curveF2m.getM(), ks), curve.getA().toBigInteger(), curve.getB().toBigInteger(), seed);
+            }
+            else
+            {
+                ks = new int[] { curveF2m.getK3(), curveF2m.getK2(), curveF2m.getK1() };
+
+                return new EllipticCurve(new ECFieldF2m(curveF2m.getM(), ks), curve.getA().toBigInteger(), curve.getB().toBigInteger(), seed);
+            } 
+        }
+
+    }
+    
+    private static ECPoint convertPoint(
+        org.spongycastle.math.ec.ECPoint  g)
+    {
+        g = g.normalize();
+        return new ECPoint(g.getAffineXCoord().toBigInteger(), g.getAffineYCoord().toBigInteger());
+    }
+    
+    public ECNamedCurveSpec(
+        String                              name,
+        ECCurve                             curve,
+        org.spongycastle.math.ec.ECPoint    g,
+        BigInteger                          n)
+    {
+        super(convertCurve(curve, null), convertPoint(g), n, 1);
+
+        this.name = name;
+    }
+
+    public ECNamedCurveSpec(
+        String          name,
+        EllipticCurve   curve,
+        ECPoint         g,
+        BigInteger      n)
+    {
+        super(curve, g, n, 1);
+
+        this.name = name;
+    }
+    
+    public ECNamedCurveSpec(
+        String                              name,
+        ECCurve                             curve,
+        org.spongycastle.math.ec.ECPoint    g,
+        BigInteger                          n,
+        BigInteger                          h)
+    {
+        super(convertCurve(curve, null), convertPoint(g), n, h.intValue());
+
+        this.name = name;
+    }
+
+    public ECNamedCurveSpec(
+        String          name,
+        EllipticCurve   curve,
+        ECPoint         g,
+        BigInteger      n,
+        BigInteger      h)
+    {
+        super(curve, g, n, h.intValue());
+
+        this.name = name;
+    }
+    
+    public ECNamedCurveSpec(
+        String                              name,
+        ECCurve                             curve,
+        org.spongycastle.math.ec.ECPoint    g,
+        BigInteger                          n,
+        BigInteger                          h,
+        byte[]                              seed)
+    {
+        super(convertCurve(curve, seed), convertPoint(g), n, h.intValue());
+        
+        this.name = name;
+    }
+
+    /**
+     * return the name of the curve the EC domain parameters belong to.
+     */
+    public String getName()
+    {
+        return name;
+    }
+}