Java ECCurve.F2m方法代码示例

import org.bouncycastle.math.ec.ECCurve; //导入方法依赖的package包/类
protected X9ECParameters createParameters()
{
    BigInteger c2m163v3n = new BigInteger("03FFFFFFFFFFFFFFFFFFFE1AEE140F110AFF961309", 16);
    BigInteger c2m163v3h = BigInteger.valueOf(2);

    ECCurve c2m163v3 = new ECCurve.F2m(
        163,
        1, 2, 8,
        new BigInteger("07A526C63D3E25A256A007699F5447E32AE456B50E", 16),
        new BigInteger("03F7061798EB99E238FD6F1BF95B48FEEB4854252B", 16),
        c2m163v3n, c2m163v3h);

    return new X9ECParameters(
        c2m163v3,
        c2m163v3.decodePoint(
            Hex.decode("0202F9F87B7C574D0BDECF8A22E6524775F98CDEBDCB")),
        c2m163v3n, c2m163v3h,
        null);
}
 

import org.bouncycastle.math.ec.ECCurve; //导入方法依赖的package包/类
public static byte[] serializeECPoint(short[] ecPointFormats, ECPoint point)
    throws IOException
{

    ECCurve curve = point.getCurve();

    /*
     * RFC 4492 5.7. ...an elliptic curve point in uncompressed or compressed format. Here, the
     * format MUST conform to what the server has requested through a Supported Point Formats
     * Extension if this extension was used, and MUST be uncompressed if this extension was not
     * used.
     */
    boolean compressed = false;
    if (curve instanceof ECCurve.F2m)
    {
        compressed = isCompressionPreferred(ecPointFormats, ECPointFormat.ansiX962_compressed_char2);
    }
    else if (curve instanceof ECCurve.Fp)
    {
        compressed = isCompressionPreferred(ecPointFormats, ECPointFormat.ansiX962_compressed_prime);
    }
    return point.getEncoded(compressed);
}
 

import org.bouncycastle.math.ec.ECCurve; //导入方法依赖的package包/类
protected X9ECParameters createParameters()
{
    int m = 113;
    int k = 9;

    BigInteger a = fromHex("003088250CA6E7C7FE649CE85820F7");
    BigInteger b = fromHex("00E8BEE4D3E2260744188BE0E9C723");
    byte[] S = Hex.decode("10E723AB14D696E6768756151756FEBF8FCB49A9");
    BigInteger n = fromHex("0100000000000000D9CCEC8A39E56F");
    BigInteger h = BigInteger.valueOf(2);

    ECCurve curve = new ECCurve.F2m(m, k, a, b, n, h);
    //ECPoint G = curve.decodePoint(Hex.decode("03"
    //+ "009D73616F35F4AB1407D73562C10F"));
    ECPoint G = curve.decodePoint(Hex.decode("04"
        + "009D73616F35F4AB1407D73562C10F"
        + "00A52830277958EE84D1315ED31886"));

    return new X9ECParameters(curve, G, n, h, S);
}
 

import org.bouncycastle.math.ec.ECCurve; //导入方法依赖的package包/类
public DSTU4145ECBinary(ECDomainParameters params)
{
    if (!(params.getCurve() instanceof ECCurve.F2m))
    {
        throw new IllegalArgumentException("only binary domain is possible");
    }

    // We always use big-endian in parameter encoding
    ECCurve.F2m curve = (ECCurve.F2m)params.getCurve();
    f = new DSTU4145BinaryField(curve.getM(), curve.getK1(), curve.getK2(), curve.getK3());
    a = new ASN1Integer(curve.getA().toBigInteger());
    X9IntegerConverter converter = new X9IntegerConverter();
    b = new DEROctetString(converter.integerToBytes(curve.getB().toBigInteger(), converter.getByteLength(curve)));
    n = new ASN1Integer(params.getN());
    bp = new DEROctetString(DSTU4145PointEncoder.encodePoint(params.getG()));
}
 

import org.bouncycastle.math.ec.ECCurve; //导入方法依赖的package包/类
public static ECCurve convertCurve(
    EllipticCurve ec)
{
    ECField field = ec.getField();
    BigInteger a = ec.getA();
    BigInteger b = ec.getB();

    if (field instanceof ECFieldFp)
    {
        return new ECCurve.Fp(((ECFieldFp)field).getP(), a, b);
    }
    else
    {
        ECFieldF2m fieldF2m = (ECFieldF2m)field;
        int m = fieldF2m.getM();
        int ks[] = ECUtil.convertMidTerms(fieldF2m.getMidTermsOfReductionPolynomial());
        return new ECCurve.F2m(m, ks[0], ks[1], ks[2], a, b); 
    }
}
 

import org.bouncycastle.math.ec.ECCurve; //导入方法依赖的package包/类
public X9ECParameters(
    ECCurve     curve,
    ECPoint     g,
    BigInteger  n,
    BigInteger  h,
    byte[]      seed)
{
    this.curve = curve;
    this.g = g;
    this.n = n;
    this.h = h;
    this.seed = seed;

    if (curve instanceof ECCurve.Fp)
    {
        this.fieldID = new X9FieldID(((ECCurve.Fp)curve).getQ());
    }
    else
    {
        if (curve instanceof ECCurve.F2m)
        {
            ECCurve.F2m curveF2m = (ECCurve.F2m)curve;
            this.fieldID = new X9FieldID(curveF2m.getM(), curveF2m.getK1(),
                curveF2m.getK2(), curveF2m.getK3());
        }
    }
}