Examples with ECFieldFp java.security.spec.ECFieldFp used on opensource projects

Example 41 with ECFieldFp

use of java.security.spec.ECFieldFp in project XobotOS by xamarin.

the class ECNamedCurveSpec method convertCurve.

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);
        }
    }
}

Example 42 with ECFieldFp

use of java.security.spec.ECFieldFp in project robovm by robovm.

the class OpenSSLECGroupContext method getInstance.

public static OpenSSLECGroupContext getInstance(ECParameterSpec params) throws InvalidAlgorithmParameterException {
    final String curveName = params.getCurveName();
    if (curveName != null) {
        return OpenSSLECGroupContext.getCurveByName(curveName);
    }
    final EllipticCurve curve = params.getCurve();
    final ECField field = curve.getField();
    final int type;
    final BigInteger p;
    if (field instanceof ECFieldFp) {
        type = NativeCrypto.EC_CURVE_GFP;
        p = ((ECFieldFp) field).getP();
    } else if (field instanceof ECFieldF2m) {
        type = NativeCrypto.EC_CURVE_GF2M;
        p = ((ECFieldF2m) field).getReductionPolynomial();
    } else {
        throw new InvalidParameterException("unhandled field class " + field.getClass().getName());
    }
    final ECPoint generator = params.getGenerator();
    return OpenSSLECGroupContext.getInstance(type, p, curve.getA(), curve.getB(), generator.getAffineX(), generator.getAffineY(), params.getOrder(), BigInteger.valueOf(params.getCofactor()));
}

Example 43 with ECFieldFp

use of java.security.spec.ECFieldFp in project robovm by robovm.

the class OpenSSLECGroupContext method getECParameterSpec.

public ECParameterSpec getECParameterSpec() {
    final String curveName = NativeCrypto.EC_GROUP_get_curve_name(groupCtx);
    final byte[][] curveParams = NativeCrypto.EC_GROUP_get_curve(groupCtx);
    final BigInteger p = new BigInteger(curveParams[0]);
    final BigInteger a = new BigInteger(curveParams[1]);
    final BigInteger b = new BigInteger(curveParams[2]);
    final ECField field;
    final int type = NativeCrypto.get_EC_GROUP_type(groupCtx);
    if (type == NativeCrypto.EC_CURVE_GFP) {
        field = new ECFieldFp(p);
    } else if (type == NativeCrypto.EC_CURVE_GF2M) {
        field = new ECFieldF2m(p.bitLength() - 1, p);
    } else {
        throw new RuntimeException("unknown curve type " + type);
    }
    final EllipticCurve curve = new EllipticCurve(field, a, b);
    final OpenSSLECPointContext generatorCtx = new OpenSSLECPointContext(this, NativeCrypto.EC_GROUP_get_generator(groupCtx));
    final ECPoint generator = generatorCtx.getECPoint();
    final BigInteger order = new BigInteger(NativeCrypto.EC_GROUP_get_order(groupCtx));
    final BigInteger cofactor = new BigInteger(NativeCrypto.EC_GROUP_get_cofactor(groupCtx));
    return new ECParameterSpec(curve, generator, order, cofactor.intValue(), curveName);
}