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25 
26 package com.sun.crypto.provider;
27 
28 import java.security.*;
29 import java.security.spec.AlgorithmParameterSpec;
30 
31 import javax.crypto.*;
32 import javax.crypto.spec.SecretKeySpec;
33 
34 import sun.security.internal.spec.TlsRsaPremasterSecretParameterSpec;
35 
36 /**
37  * KeyGenerator implementation for the SSL/TLS RSA premaster secret.
38  *
39  * @author  Andreas Sterbenz
40  * @since   1.6
41  */
42 public final class TlsRsaPremasterSecretGenerator extends KeyGeneratorSpi {
43 
44     private final static String MSG = "TlsRsaPremasterSecretGenerator must be "
45         + "initialized using a TlsRsaPremasterSecretParameterSpec";
46 
47     private TlsRsaPremasterSecretParameterSpec spec;
48     private SecureRandom random;
49 
TlsRsaPremasterSecretGenerator()50     public TlsRsaPremasterSecretGenerator() {
51     }
52 
engineInit(SecureRandom random)53     protected void engineInit(SecureRandom random) {
54         throw new InvalidParameterException(MSG);
55     }
56 
engineInit(AlgorithmParameterSpec params, SecureRandom random)57     protected void engineInit(AlgorithmParameterSpec params,
58             SecureRandom random) throws InvalidAlgorithmParameterException {
59         if (!(params instanceof TlsRsaPremasterSecretParameterSpec)) {
60             throw new InvalidAlgorithmParameterException(MSG);
61         }
62         this.spec = (TlsRsaPremasterSecretParameterSpec)params;
63         this.random = random;
64     }
65 
engineInit(int keysize, SecureRandom random)66     protected void engineInit(int keysize, SecureRandom random) {
67         throw new InvalidParameterException(MSG);
68     }
69 
70     // Only can be used in client side to generate TLS RSA premaster secret.
engineGenerateKey()71     protected SecretKey engineGenerateKey() {
72         if (spec == null) {
73             throw new IllegalStateException(
74                 "TlsRsaPremasterSecretGenerator must be initialized");
75         }
76 
77         byte[] b = spec.getEncodedSecret();
78         if (b == null) {
79             if (random == null) {
80                 random = new SecureRandom();
81             }
82             b = new byte[48];
83             random.nextBytes(b);
84         }
85         b[0] = (byte)spec.getMajorVersion();
86         b[1] = (byte)spec.getMinorVersion();
87 
88         return new SecretKeySpec(b, "TlsRsaPremasterSecret");
89     }
90 
91 }
92