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