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25 
26 package java.security.spec;
27 
28 import java.math.BigInteger;
29 
30 /**
31  * This class specifies an RSA public key.
32  *
33  * @author Jan Luehe
34  *
35  *
36  * @see java.security.Key
37  * @see java.security.KeyFactory
38  * @see KeySpec
39  * @see X509EncodedKeySpec
40  * @see RSAPrivateKeySpec
41  * @see RSAPrivateCrtKeySpec
42  */
43 
44 public class RSAPublicKeySpec implements KeySpec {
45 
46     private final BigInteger modulus;
47     private final BigInteger publicExponent;
48     private final AlgorithmParameterSpec params;
49 
50     /**
51      * Creates a new RSAPublicKeySpec.
52      *
53      * @param modulus the modulus
54      * @param publicExponent the public exponent
55      */
RSAPublicKeySpec(BigInteger modulus, BigInteger publicExponent)56     public RSAPublicKeySpec(BigInteger modulus, BigInteger publicExponent) {
57         this(modulus, publicExponent, null);
58     }
59 
60     /**
61      * Creates a new RSAPublicKeySpec with additional key parameters.
62      *
63      * @param modulus the modulus
64      * @param publicExponent the public exponent
65      * @param params the parameters associated with this key, may be null
66      * @since 8
67      */
RSAPublicKeySpec(BigInteger modulus, BigInteger publicExponent, AlgorithmParameterSpec params)68     public RSAPublicKeySpec(BigInteger modulus, BigInteger publicExponent,
69             AlgorithmParameterSpec params) {
70         this.modulus = modulus;
71         this.publicExponent = publicExponent;
72         this.params = params;
73     }
74 
75 
76     /**
77      * Returns the modulus.
78      *
79      * @return the modulus
80      */
getModulus()81     public BigInteger getModulus() {
82         return this.modulus;
83     }
84 
85     /**
86      * Returns the public exponent.
87      *
88      * @return the public exponent
89      */
getPublicExponent()90     public BigInteger getPublicExponent() {
91         return this.publicExponent;
92     }
93 
94     /**
95      * Returns the parameters associated with this key, may be null if not
96      * present.
97      *
98      * @return the parameters associated with this key
99      * @since 8
100      */
getParams()101     public AlgorithmParameterSpec getParams() {
102         return this.params;
103     }
104 
105 }
106