1 /*
   2  * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 package sun.security.ec.point;
  26 
  27 import sun.security.util.math.ImmutableIntegerModuloP;
  28 
  29 import java.util.Objects;
  30 
  31 /**
  32  * Elliptic curve point represented using affine coordinates (x, y). This class
  33  * is not part of the sun.security.ec.point.Point hierarchy because it is not
  34  * used to hold intermediate values during point arithmetic, and so it does not
  35  * have a mutable form.
  36  */
  37 public class AffinePoint {
  38 
  39     private final ImmutableIntegerModuloP x;
  40     private final ImmutableIntegerModuloP y;
  41 
  42     public AffinePoint(ImmutableIntegerModuloP x, ImmutableIntegerModuloP y) {
  43         this.x = x;
  44         this.y = y;
  45     }
  46 
  47     public ImmutableIntegerModuloP getX() {
  48         return x;
  49     }
  50 
  51     public ImmutableIntegerModuloP getY() {
  52         return y;
  53     }
  54 
  55     @Override
  56     public boolean equals(Object obj) {
  57         if (!(obj instanceof AffinePoint)) {
  58             return false;
  59         }
  60         AffinePoint p = (AffinePoint) obj;
  61         boolean xEquals = x.asBigInteger().equals(p.x.asBigInteger());
  62         boolean yEquals = y.asBigInteger().equals(p.y.asBigInteger());
  63         return xEquals && yEquals;
  64     }
  65 
  66     @Override
  67     public int hashCode() {
  68         return Objects.hash(x, y);
  69     }
  70 
  71     @Override
  72     public String toString() {
  73         return "(" + x.asBigInteger().toString() + "," +
  74             y.asBigInteger().toString() + ")";
  75     }
  76 }