| package org.bouncycastle.asn1.gm; |
| |
| 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; |
| |
| /** |
| * Chinese standard GM named curves. |
| */ |
| public class GMNamedCurves |
| { |
| private static ECCurve configureCurve(ECCurve curve) |
| { |
| return curve; |
| } |
| |
| private static BigInteger fromHex( |
| String hex) |
| { |
| return new BigInteger(1, Hex.decode(hex)); |
| } |
| |
| /* |
| * SM2SysParams |
| */ |
| static X9ECParametersHolder sm2p256v1 = new X9ECParametersHolder() |
| { |
| protected X9ECParameters createParameters() |
| { |
| |
| BigInteger p = fromHex("FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFF"); |
| BigInteger a = fromHex("FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFC"); |
| BigInteger b = fromHex("28E9FA9E9D9F5E344D5A9E4BCF6509A7F39789F515AB8F92DDBCBD414D940E93"); |
| byte[] S = null; |
| BigInteger n = fromHex("FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFF7203DF6B21C6052B53BBF40939D54123"); |
| BigInteger h = BigInteger.valueOf(1); |
| |
| ECCurve curve = configureCurve(new ECCurve.Fp(p, a, b, n, h)); |
| X9ECPoint G = new X9ECPoint(curve, Hex.decode("04" |
| + "32C4AE2C1F1981195F9904466A39C9948FE30BBFF2660BE1715A4589334C74C7" |
| + "BC3736A2F4F6779C59BDCEE36B692153D0A9877CC62A474002DF32E52139F0A0")); |
| |
| return new X9ECParameters(curve, G, n, h, S); |
| } |
| }; |
| |
| static X9ECParametersHolder wapip192v1 = new X9ECParametersHolder() |
| { |
| protected X9ECParameters createParameters() |
| { |
| BigInteger p = fromHex("BDB6F4FE3E8B1D9E0DA8C0D46F4C318CEFE4AFE3B6B8551F"); |
| BigInteger a = fromHex("BB8E5E8FBC115E139FE6A814FE48AAA6F0ADA1AA5DF91985"); |
| BigInteger b = fromHex("1854BEBDC31B21B7AEFC80AB0ECD10D5B1B3308E6DBF11C1"); |
| byte[] S = null; |
| BigInteger n = fromHex("BDB6F4FE3E8B1D9E0DA8C0D40FC962195DFAE76F56564677"); |
| BigInteger h = BigInteger.valueOf(1); |
| |
| ECCurve curve = configureCurve(new ECCurve.Fp(p, a, b, n, h)); |
| X9ECPoint G = new X9ECPoint(curve, Hex.decode("04" |
| + "4AD5F7048DE709AD51236DE6" + "5E4D4B482C836DC6E4106640" |
| + "02BB3A02D4AAADACAE24817A" + "4CA3A1B014B5270432DB27D2")); |
| |
| 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("wapip192v1", GMObjectIdentifiers.wapip192v1, wapip192v1); |
| defineCurve("sm2p256v1", GMObjectIdentifiers.sm2p256v1, sm2p256v1); |
| } |
| |
| 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(); |
| } |
| } |
| |