1 files changed, 120 insertions, 0 deletions
diff --git a/core/src/main/java/org/bouncycastle/crypto/ec/CustomNamedCurves.java b/core/src/main/java/org/bouncycastle/crypto/ec/CustomNamedCurves.java
new file mode 100644
index 00000000..96039c6c
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+++ b/core/src/main/java/org/bouncycastle/crypto/ec/CustomNamedCurves.java
@@ -0,0 +1,120 @@
+package org.bouncycastle.crypto.ec;
+
+import java.util.Enumeration;
+import java.util.Hashtable;
+
+import org.bouncycastle.asn1.ASN1ObjectIdentifier;
+import org.bouncycastle.asn1.sec.SECObjectIdentifiers;
+import org.bouncycastle.asn1.x9.X9ECParameters;
+import org.bouncycastle.asn1.x9.X9ECParametersHolder;
+import org.bouncycastle.math.ec.ECCurve;
+import org.bouncycastle.math.ec.ECPoint;
+import org.bouncycastle.math.ec.custom.sec.SecP256K1Curve;
+import org.bouncycastle.math.ec.custom.sec.SecP256R1Curve;
+import org.bouncycastle.util.Strings;
+import org.bouncycastle.util.encoders.Hex;
+
+public class CustomNamedCurves
+{
+    private static ECCurve configureCurve(ECCurve curve)
+    {
+        return curve;
+    }
+
+    /*
+     * secp256k1
+     */
+    static X9ECParametersHolder secp256k1 = new X9ECParametersHolder()
+    {
+        protected X9ECParameters createParameters()
+        {
+            byte[] S = null;
+            ECCurve curve = configureCurve(new SecP256K1Curve());
+            ECPoint G = curve.decodePoint(Hex.decode("04"
+                + "79BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798"
+                + "483ADA7726A3C4655DA4FBFC0E1108A8FD17B448A68554199C47D08FFB10D4B8"));
+            return new X9ECParameters(curve, G, curve.getOrder(), curve.getCofactor(), S);
+        }
+    };
+
+    /*
+     * secp256r1
+     */
+    static X9ECParametersHolder secp256r1 = new X9ECParametersHolder()
+    {
+        protected X9ECParameters createParameters()
+        {
+            byte[] S = Hex.decode("C49D360886E704936A6678E1139D26B7819F7E90");
+            ECCurve curve = configureCurve(new SecP256R1Curve());
+            ECPoint G = curve.decodePoint(Hex.decode("04"
+                + "6B17D1F2E12C4247F8BCE6E563A440F277037D812DEB33A0F4A13945D898C296"
+                + "4FE342E2FE1A7F9B8EE7EB4A7C0F9E162BCE33576B315ECECBB6406837BF51F5"));
+            return new X9ECParameters(curve, G, curve.getOrder(), curve.getCofactor(), S);
+        }
+    };
+
+    static final Hashtable objIds = new Hashtable();
+    static final Hashtable curves = new Hashtable();
+    static final Hashtable names = new Hashtable();
+
+    static void defineCurve(String name, ASN1ObjectIdentifier oid, X9ECParametersHolder holder)
+    {
+        objIds.put(name, oid);
+        names.put(oid, name);
+        curves.put(oid, holder);
+    }
+
+    static
+    {
+        defineCurve("secp256k1", SECObjectIdentifiers.secp256k1, secp256k1);
+        defineCurve("secp256r1", SECObjectIdentifiers.secp256r1, secp256r1);
+
+        objIds.put(Strings.toLowerCase("P-256"), SECObjectIdentifiers.secp256r1);
+    }
+
+    public static X9ECParameters getByName(String name)
+    {
+        ASN1ObjectIdentifier oid = (ASN1ObjectIdentifier)objIds.get(Strings.toLowerCase(name));
+        return oid == null ? null : getByOID(oid);
+    }
+
+    /**
+     * return the X9ECParameters object for the named curve represented by the passed in object
+     * identifier. Null if the curve isn't present.
+     * 
+     * @param oid
+     *            an object identifier representing a named curve, if present.
+     */
+    public static X9ECParameters getByOID(ASN1ObjectIdentifier oid)
+    {
+        X9ECParametersHolder holder = (X9ECParametersHolder)curves.get(oid);
+        return holder == null ? null : holder.getParameters();
+    }
+
+    /**
+     * return the object identifier signified by the passed in name. Null if there is no object
+     * identifier associated with name.
+     * 
+     * @return the object identifier associated with name, if present.
+     */
+    public static ASN1ObjectIdentifier getOID(String name)
+    {
+        return (ASN1ObjectIdentifier)objIds.get(Strings.toLowerCase(name));
+    }
+
+    /**
+     * return the named curve name represented by the given object identifier.
+     */
+    public static String getName(ASN1ObjectIdentifier oid)
+    {
+        return (String)names.get(oid);
+    }
+
+    /**
+     * returns an enumeration containing the name strings for curves contained in this structure.
+     */
+    public static Enumeration getNames()
+    {
+        return objIds.keys();
+    }
+}