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25 package sun.security.util;
26 
27 import java.security.spec.AlgorithmParameterSpec;
28 
29 import sun.security.util.ObjectIdentifier;
30 
31 /**
32  * This immutable class is used when randomly generating a key pair and the
33  * consumer only specifies the length of the key and therefore a curve for that
34  * key size must be picked from a the list of supported curves using this spec.
35  *
36  * @see AlgorithmParameterSpec
37  * @see ECGenParameterSpec
38  */
39 public class ECKeySizeParameterSpec implements AlgorithmParameterSpec {
40 
41     private int keySize;
42 
43     /**
44      * Creates a parameter specification for EC curve
45      * generation using a standard (or predefined) key size
46      * <code>keySize</code> in order to generate the corresponding
47      * (precomputed) elliptic curve.
48      * <p>
49      * Note, if the curve of the specified length is not supported,
50      * <code>AlgorithmParameters.init</code> will throw an exception.
51      *
52      * @param keySize the key size of the curve to lookup
53      */
ECKeySizeParameterSpec(int keySize)54     public ECKeySizeParameterSpec(int keySize) {
55         this.keySize = keySize;
56     }
57 
58     /**
59      * Returns the key size of this spec.
60      *
61      * @return the standard or predefined key size.
62      */
getKeySize()63     public int getKeySize() {
64         return keySize;
65     }
66 }
67