1f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project/* 2f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * Licensed to the Apache Software Foundation (ASF) under one or more 3f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * contributor license agreements. See the NOTICE file distributed with 4f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * this work for additional information regarding copyright ownership. 5f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * The ASF licenses this file to You under the Apache License, Version 2.0 6f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * (the "License"); you may not use this file except in compliance with 7f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * the License. You may obtain a copy of the License at 8f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * 9f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 10f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * 11f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * Unless required by applicable law or agreed to in writing, software 12f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 13f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * See the License for the specific language governing permissions and 15f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * limitations under the License. 16f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project */ 17f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 18f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Projectpackage java.security.spec; 19f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 20f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Projectimport java.math.BigInteger; 21f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 22f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Projectimport org.apache.harmony.security.internal.nls.Messages; 23f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 24f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project/** 25f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * A Point on an Elliptic Curve in barycentric (or affine) coordinates. 26f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project */ 27f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Projectpublic class ECPoint { 28f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 29f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project /** 30f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * The point on an Elliptic Curve at infinity. 31f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project */ 32f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project public static final ECPoint POINT_INFINITY = new ECPoint(); 33f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project // affine X coordinate of this point 34f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project private final BigInteger affineX; 35f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project // affine Y coordinate of this point 36f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project private final BigInteger affineY; 37f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 38f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project // Private ctor for POINT_INFINITY 39f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project private ECPoint() { 40f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project affineX = null; 41f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project affineY = null; 42f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 43f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 44f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project /** 45f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * Creates a new point at the specified coordinates. 46f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * 47f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * @param affineX 48f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * the x-coordinate. 49f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * @param affineY 50f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * the y-coordinate. 51f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project */ 52f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project public ECPoint(BigInteger affineX, BigInteger affineY) { 53f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project this.affineX = affineX; 54f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project if (this.affineX == null) { 55f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project throw new NullPointerException(Messages.getString("security.83", "X")); //$NON-NLS-1$ //$NON-NLS-2$ 56f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 57f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project this.affineY = affineY; 58f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project if (this.affineY == null) { 59f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project throw new NullPointerException(Messages.getString("security.83", "Y")); //$NON-NLS-1$ //$NON-NLS-2$ 60f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 61f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 62f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 63f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project /** 64f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * Returns the x-coordinate. 65f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * 66f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * @return the x-coordinate, or {@code null} for the infinite point. 67f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project */ 68f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project public BigInteger getAffineX() { 69f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project return affineX; 70f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 71f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 72f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project /** 73f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * Returns the y-coordinate. 74f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * 75f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * @return the y-coordinate, or {@code null} fot the infinite point. 76f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project */ 77f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project public BigInteger getAffineY() { 78f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project return affineY; 79f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 80f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 81f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project /** 82f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * Returns whether the specified object and this elliptic curve point are 83f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * equal. 84f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * 85f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * @param other 86f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * the object to compare. 87f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * @return {@code true} if the specified object and this elliptic curve 88f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * point are equal, otherwise {@code false}. 89f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project */ 90f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project public boolean equals(Object other) { 91f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project if (this == other) { 92f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project return true; 93f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 94f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project if (other instanceof ECPoint) { 95f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project if (this.affineX != null) { 96f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project ECPoint otherPoint = (ECPoint)other; 97f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project // no need to check for null in this case 98f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project return this.affineX.equals(otherPoint.affineX) && 99f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project this.affineY.equals(otherPoint.affineY); 100f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } else { 101f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project return other == POINT_INFINITY; 102f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 103f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 104f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project return false; 105f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 106f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 107f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project /** 108f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * Returns the hashcode of this elliptic curve point. 109f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * 110f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * @return the hashcode of this elliptic curve point. 111f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project */ 112f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project public int hashCode() { 113f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project if (this.affineX != null) { 114f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project return affineX.hashCode() * 31 + affineY.hashCode(); 115f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 116f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project return 11; 117f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 118f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project} 119