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25 package java.security.spec;
26 
27 /**
28  * This immutable class specifies an elliptic curve public key with
29  * its associated parameters.
30  *
31  * @see KeySpec
32  * @see ECPoint
33  * @see ECParameterSpec
34  *
35  * @author Valerie Peng
36  *
37  * @since 1.5
38  */
39 public class ECPublicKeySpec implements KeySpec {
40 
41     private ECPoint w;
42     private ECParameterSpec params;
43 
44     /**
45      * Creates a new ECPublicKeySpec with the specified
46      * parameter values.
47      * @param w the public point.
48      * @param params the associated elliptic curve domain
49      * parameters.
50      * @exception NullPointerException if {@code w}
51      * or {@code params} is null.
52      * @exception IllegalArgumentException if {@code w}
53      * is point at infinity, i.e. ECPoint.POINT_INFINITY
54      */
ECPublicKeySpec(ECPoint w, ECParameterSpec params)55     public ECPublicKeySpec(ECPoint w, ECParameterSpec params) {
56         if (w == null) {
57             throw new NullPointerException("w is null");
58         }
59         if (params == null) {
60             throw new NullPointerException("params is null");
61         }
62         if (w == ECPoint.POINT_INFINITY) {
63             throw new IllegalArgumentException("w is ECPoint.POINT_INFINITY");
64         }
65         this.w = w;
66         this.params = params;
67     }
68 
69     /**
70      * Returns the public point W.
71      * @return the public point W.
72      */
getW()73     public ECPoint getW() {
74         return w;
75     }
76 
77     /**
78      * Returns the associated elliptic curve domain
79      * parameters.
80      * @return the EC domain parameters.
81      */
getParams()82     public ECParameterSpec getParams() {
83         return params;
84     }
85 }
86