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The ProximaX Sirius Chain Java SDK is a Java library for interacting with the Sirius Blockchain.

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/*
 * Copyright 2018 NEM
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.proximax.core.crypto.ed25519;

import java.math.BigInteger;

import io.proximax.core.crypto.Curve;
import io.proximax.core.crypto.ed25519.arithmetic.Ed25519Group;

/**
 * Class that wraps the elliptic curve Ed25519.
 */
public class Ed25519Curve implements Curve {

    private static final Ed25519Curve ED25519;

    static {
        ED25519 = new Ed25519Curve();
    }

    /**
     * Gets the Ed25519 instance.
     *
     * @return The Ed25519 instance.
     */
    public static Ed25519Curve ed25519() {
        return ED25519;
    }

    @Override
    public String getName() {
        return "ed25519";
    }

    @Override
    public BigInteger getGroupOrder() {
        return Ed25519Group.GROUP_ORDER;
    }

    @Override
    public BigInteger getHalfGroupOrder() {
        return Ed25519Group.GROUP_ORDER.shiftRight(1);
    }
}