ECParameterSpec.java revision e6bf3e8dfa2804891a82075cb469b736321b4827 
1package org.bouncycastle.jce.spec;
2
3import org.bouncycastle.math.ec.ECCurve;
4import org.bouncycastle.math.ec.ECPoint;
5
6import java.math.BigInteger;
7import java.security.spec.AlgorithmParameterSpec;
8
9/**
10 * basic domain parameters for an Elliptic Curve public or private key.
11 */
12public class ECParameterSpec
13    implements AlgorithmParameterSpec
14{
15    private ECCurve     curve;
16    private byte[]      seed;
17    private ECPoint     G;
18    private BigInteger  n;
19    private BigInteger  h;
20
21    public ECParameterSpec(
22        ECCurve     curve,
23        ECPoint     G,
24        BigInteger  n)
25    {
26        this.curve = curve;
27        this.G = G;
28        this.n = n;
29        this.h = BigInteger.valueOf(1);
30        this.seed = null;
31    }
32
33    public ECParameterSpec(
34        ECCurve     curve,
35        ECPoint     G,
36        BigInteger  n,
37        BigInteger  h)
38    {
39        this.curve = curve;
40        this.G = G;
41        this.n = n;
42        this.h = h;
43        this.seed = null;
44    }
45
46    public ECParameterSpec(
47        ECCurve     curve,
48        ECPoint     G,
49        BigInteger  n,
50        BigInteger  h,
51        byte[]      seed)
52    {
53        this.curve = curve;
54        this.G = G;
55        this.n = n;
56        this.h = h;
57        this.seed = seed;
58    }
59
60    /**
61     * return the curve along which the base point lies.
62     * @return the curve
63     */
64    public ECCurve getCurve()
65    {
66        return curve;
67    }
68
69    /**
70     * return the base point we are using for these domain parameters.
71     * @return the base point.
72     */
73    public ECPoint getG()
74    {
75        return G;
76    }
77
78    /**
79     * return the order N of G
80     * @return the order
81     */
82    public BigInteger getN()
83    {
84        return n;
85    }
86
87    /**
88     * return the cofactor H to the order of G.
89     * @return the cofactor
90     */
91    public BigInteger getH()
92    {
93        return h;
94    }
95
96    /**
97     * return the seed used to generate this curve (if available).
98     * @return the random seed
99     */
100    public byte[] getSeed()
101    {
102        return seed;
103    }
104
105    public boolean equals(Object o)
106    {
107        if (!(o instanceof ECParameterSpec))
108        {
109            return false;
110        }
111
112        ECParameterSpec other = (ECParameterSpec)o;
113
114        return this.getCurve().equals(other.getCurve()) && this.getG().equals(other.getG());
115    }
116
117    public int hashCode()
118    {
119        return this.getCurve().hashCode() ^ this.getG().hashCode();
120    }
121}
122