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25 
26 package java.security.spec;
27 
28 import java.math.BigInteger;
29 import java.security.spec.AlgorithmParameterSpec;
30 
31 /**
32  * This class specifies the set of parameters used to generate an RSA
33  * key pair.
34  *
35  * @author Jan Luehe
36  *
37  * @see java.security.KeyPairGenerator#initialize(java.security.spec.AlgorithmParameterSpec)
38  *
39  * @since 1.3
40  */
41 
42 public class RSAKeyGenParameterSpec implements AlgorithmParameterSpec {
43 
44     private int keysize;
45     private BigInteger publicExponent;
46 
47     /**
48      * The public-exponent value F0 = 3.
49      */
50     public static final BigInteger F0 = BigInteger.valueOf(3);
51 
52     /**
53      * The public exponent-value F4 = 65537.
54      */
55     public static final BigInteger F4 = BigInteger.valueOf(65537);
56 
57     /**
58      * Constructs a new {@code RSAParameterSpec} object from the
59      * given keysize and public-exponent value.
60      *
61      * @param keysize the modulus size (specified in number of bits)
62      * @param publicExponent the public exponent
63      */
RSAKeyGenParameterSpec(int keysize, BigInteger publicExponent)64     public RSAKeyGenParameterSpec(int keysize, BigInteger publicExponent) {
65         this.keysize = keysize;
66         this.publicExponent = publicExponent;
67     }
68 
69     /**
70      * Returns the keysize.
71      *
72      * @return the keysize.
73      */
getKeysize()74     public int getKeysize() {
75         return keysize;
76     }
77 
78     /**
79      * Returns the public-exponent value.
80      *
81      * @return the public-exponent value.
82      */
getPublicExponent()83     public BigInteger getPublicExponent() {
84         return publicExponent;
85     }
86 }
87