Example usage for org.bouncycastle.crypto.ec CustomNamedCurves getByOID

Introduction

In this page you can find the example usage for org.bouncycastle.crypto.ec CustomNamedCurves getByOID.

Prototype

public static X9ECParameters getByOID(ASN1ObjectIdentifier oid) 

Source Link

Document

return the X9ECParameters object for the named curve represented by the passed in object identifier.

Usage

From source file:dorkbox.util.serialization.EccPrivateKeySerializer.java

License:Apache License

static ECCurve deserializeCurve(Input input) throws KryoException {
    byte[] bytes;
    int length;//from   ww w .  jav a  2 s .c o  m

    ECCurve curve;

    int serializationType = input.readInt(true);

    // lookup via name
    if (serializationType == usesName) {
        String curveName = input.readString();
        X9ECParameters x9Curve = CustomNamedCurves.getByName(curveName);
        curve = x9Curve.getCurve();
    }

    // this means we just lookup the curve via the OID
    else if (serializationType == usesOid) {
        String oid = input.readString();
        X9ECParameters x9Curve = CustomNamedCurves.getByOID(new ASN1ObjectIdentifier(oid));
        curve = x9Curve.getCurve();
    }

    // we have to read in the entire curve information.
    else {
        /////////////
        length = input.readInt(true);
        bytes = new byte[length];
        input.readBytes(bytes, 0, length);
        BigInteger a = new BigInteger(bytes);

        /////////////
        length = input.readInt(true);
        bytes = new byte[length];
        input.readBytes(bytes, 0, length);
        BigInteger b = new BigInteger(bytes);

        /////////////
        length = input.readInt(true);
        bytes = new byte[length];
        input.readBytes(bytes, 0, length);
        BigInteger order = new BigInteger(bytes);

        /////////////
        length = input.readInt(true);
        bytes = new byte[length];
        input.readBytes(bytes, 0, length);
        BigInteger cofactor = new BigInteger(bytes);

        /////////////
        length = input.readInt(true);
        bytes = new byte[length];
        input.readBytes(bytes, 0, length);
        BigInteger q = new BigInteger(bytes);

        // coord system
        int coordinateSystem = input.readInt(true);

        curve = new ECCurve.Fp(q, a, b, order, cofactor);
        ecCurveAccess.setInt(curve, ecCoordIndex, coordinateSystem);
    }
    return curve;
}

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