ECFieldFp.java revision 2ad60cfc28e14ee8f0bb038720836a4696c478ad 
1/*
2 *  Licensed to the Apache Software Foundation (ASF) under one or more
3 *  contributor license agreements.  See the NOTICE file distributed with
4 *  this work for additional information regarding copyright ownership.
5 *  The ASF licenses this file to You under the Apache License, Version 2.0
6 *  (the "License"); you may not use this file except in compliance with
7 *  the License.  You may obtain a copy of the License at
8 *
9 *     http://www.apache.org/licenses/LICENSE-2.0
10 *
11 *  Unless required by applicable law or agreed to in writing, software
12 *  distributed under the License is distributed on an "AS IS" BASIS,
13 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 *  See the License for the specific language governing permissions and
15 *  limitations under the License.
16 */
17
18/**
19* @author Vladimir N. Molotkov
20* @version $Revision$
21*/
22
23package java.security.spec;
24
25import java.math.BigInteger;
26
27import org.apache.harmony.security.internal.nls.Messages;
28
29/**
30 * @com.intel.drl.spec_ref
31 *
32 */
33public class ECFieldFp implements ECField {
34    // Prime
35    private final BigInteger p;
36
37    /**
38     * @com.intel.drl.spec_ref
39     */
40    public ECFieldFp(BigInteger p) {
41        this.p = p;
42
43        if (this.p == null) {
44            throw new NullPointerException(Messages.getString("security.83", "p")); //$NON-NLS-1$ //$NON-NLS-2$
45        }
46        if (this.p.signum() != 1) {
47            throw new IllegalArgumentException(Messages.getString("security.86", "p")); //$NON-NLS-1$ //$NON-NLS-2$
48        }
49    }
50
51    /**
52     * @com.intel.drl.spec_ref
53     */
54    public int getFieldSize() {
55        return p.bitLength();
56    }
57
58    /**
59     * @com.intel.drl.spec_ref
60     */
61    public BigInteger getP() {
62        return p;
63    }
64
65    /**
66     * @com.intel.drl.spec_ref
67     */
68    public boolean equals(Object obj) {
69        // object equals itself
70        if (this == obj) {
71            return true;
72        }
73        if (obj instanceof ECFieldFp) {
74            return (this.p.equals(((ECFieldFp)obj).p));
75        }
76        return false;
77    }
78
79    /**
80     * @com.intel.drl.spec_ref
81     */
82    public int hashCode() {
83        return p.hashCode();
84    }
85}
86