| package org.bouncycastle.asn1.anssi; |
| |
| import java.math.BigInteger; |
| import java.util.Enumeration; |
| import java.util.Hashtable; |
| |
| import org.bouncycastle.asn1.ASN1ObjectIdentifier; |
| import org.bouncycastle.asn1.x9.X9ECParameters; |
| import org.bouncycastle.asn1.x9.X9ECParametersHolder; |
| import org.bouncycastle.asn1.x9.X9ECPoint; |
| import org.bouncycastle.math.ec.ECCurve; |
| import org.bouncycastle.util.Strings; |
| import org.bouncycastle.util.encoders.Hex; |
| |
| /** |
| * ANSSI Elliptic curve table. |
| */ |
| public class ANSSINamedCurves |
| { |
| private static ECCurve configureCurve(ECCurve curve) |
| { |
| return curve; |
| } |
| |
| private static BigInteger fromHex( |
| String hex) |
| { |
| return new BigInteger(1, Hex.decode(hex)); |
| } |
| |
| /* |
| * FRP256v1 |
| */ |
| static X9ECParametersHolder FRP256v1 = new X9ECParametersHolder() |
| { |
| protected X9ECParameters createParameters() |
| { |
| BigInteger p = fromHex("F1FD178C0B3AD58F10126DE8CE42435B3961ADBCABC8CA6DE8FCF353D86E9C03"); |
| BigInteger a = fromHex("F1FD178C0B3AD58F10126DE8CE42435B3961ADBCABC8CA6DE8FCF353D86E9C00"); |
| BigInteger b = fromHex("EE353FCA5428A9300D4ABA754A44C00FDFEC0C9AE4B1A1803075ED967B7BB73F"); |
| byte[] S = null; |
| BigInteger n = fromHex("F1FD178C0B3AD58F10126DE8CE42435B53DC67E140D2BF941FFDD459C6D655E1"); |
| BigInteger h = BigInteger.valueOf(1); |
| |
| ECCurve curve = configureCurve(new ECCurve.Fp(p, a, b, n, h)); |
| X9ECPoint G = new X9ECPoint(curve, Hex.decode("04" |
| + "B6B3D4C356C139EB31183D4749D423958C27D2DCAF98B70164C97A2DD98F5CFF" |
| + "6142E0F7C8B204911F9271F0F3ECEF8C2701C307E8E4C9E183115A1554062CFB")); |
| |
| return new X9ECParameters(curve, G, n, h, 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(Strings.toLowerCase(name), oid); |
| names.put(oid, name); |
| curves.put(oid, holder); |
| } |
| |
| static |
| { |
| defineCurve("FRP256v1", ANSSIObjectIdentifiers.FRP256v1, FRP256v1); |
| } |
| |
| public static X9ECParameters getByName( |
| String name) |
| { |
| ASN1ObjectIdentifier oid = getOID(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 names.elements(); |
| } |
| } |