| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 java.security.spec; |
| |
| import java.math.BigInteger; |
| |
| /** |
| * A Point on an Elliptic Curve in barycentric (or affine) coordinates. |
| */ |
| public class ECPoint { |
| |
| /** |
| * The point on an Elliptic Curve at infinity. |
| */ |
| public static final ECPoint POINT_INFINITY = new ECPoint(); |
| // affine X coordinate of this point |
| private final BigInteger affineX; |
| // affine Y coordinate of this point |
| private final BigInteger affineY; |
| |
| // Private ctor for POINT_INFINITY |
| private ECPoint() { |
| affineX = null; |
| affineY = null; |
| } |
| |
| /** |
| * Creates a new point at the specified coordinates. |
| * |
| * @param affineX |
| * the x-coordinate. |
| * @param affineY |
| * the y-coordinate. |
| */ |
| public ECPoint(BigInteger affineX, BigInteger affineY) { |
| this.affineX = affineX; |
| if (this.affineX == null) { |
| throw new NullPointerException("affineX == null"); |
| } |
| this.affineY = affineY; |
| if (this.affineY == null) { |
| throw new NullPointerException("affineY == null"); |
| } |
| } |
| |
| /** |
| * Returns the x-coordinate. |
| * |
| * @return the x-coordinate, or {@code null} for the infinite point. |
| */ |
| public BigInteger getAffineX() { |
| return affineX; |
| } |
| |
| /** |
| * Returns the y-coordinate. |
| * |
| * @return the y-coordinate, or {@code null} fot the infinite point. |
| */ |
| public BigInteger getAffineY() { |
| return affineY; |
| } |
| |
| /** |
| * Returns whether the specified object and this elliptic curve point are |
| * equal. |
| * |
| * @param other |
| * the object to compare. |
| * @return {@code true} if the specified object and this elliptic curve |
| * point are equal, otherwise {@code false}. |
| */ |
| public boolean equals(Object other) { |
| if (this == other) { |
| return true; |
| } |
| if (other instanceof ECPoint) { |
| if (this.affineX != null) { |
| ECPoint otherPoint = (ECPoint)other; |
| // no need to check for null in this case |
| return this.affineX.equals(otherPoint.affineX) && |
| this.affineY.equals(otherPoint.affineY); |
| } else { |
| return other == POINT_INFINITY; |
| } |
| } |
| return false; |
| } |
| |
| /** |
| * Returns the hashcode of this elliptic curve point. |
| * |
| * @return the hashcode of this elliptic curve point. |
| */ |
| public int hashCode() { |
| if (this.affineX != null) { |
| return affineX.hashCode() * 31 + affineY.hashCode(); |
| } |
| return 11; |
| } |
| } |