|
1
7 package org.jboss.test;
8
9 import java.io.Serializable  ;
10 import java.math.BigInteger ;
11 import java.security.AlgorithmParameters ;
12 import java.security.Key ;
13 import java.security.KeyException ;
14 import java.security.MessageDigest ;
15 import java.security.Provider ;
16 import java.security.SecureRandom ;
17 import java.security.Security ;
18 import java.util.Iterator ;
19 import java.lang.reflect.Constructor ;
20 import javax.crypto.Cipher;
21 import javax.crypto.KeyGenerator;
22 import javax.crypto.SealedObject;
23 import javax.crypto.SecretKey;
24 import javax.crypto.spec.SecretKeySpec;
25
26
30 public class TestJCE
31 {
32 static void showProviders() throws Exception
33 {
34 Provider [] providers = Security.getProviders();
35 for(int p = 0; p < providers.length; p ++)
36 {
37 Iterator iter = providers[p].keySet().iterator();
38 System.out.println("Provider: "+providers[p].getInfo());
39 while( iter.hasNext() )
40 {
41 String key = (String ) iter.next();
42 System.out.println(" key="+key+", value="+providers[p].getProperty(key));
43 }
44 }
45 }
46
47 static void testBlowfish() throws Exception
48 {
49 KeyGenerator kgen = KeyGenerator.getInstance("Blowfish");
50 Cipher cipher = Cipher.getInstance("Blowfish");
51 SecretKey key = null;
52 int minKeyBits = -1, maxKeyBits = 0;
53 int minCipherBits = -1, maxCipherBits = 0;
54 for(int size = 1; size <= 448/8; size ++)
55 {
56 int bits = size * 8;
57 try
58 {
59 kgen.init(bits);
60 key = kgen.generateKey();
61 if( minKeyBits == -1 )
62 minKeyBits = bits;
63 maxKeyBits = bits;
64 }
65 catch(Exception e)
66 {
67 System.out.println("Failed to create key with bits="+bits);
68 e.printStackTrace();
69 continue;
70 }
71
72 try
73 {
74 cipher.init(Cipher.ENCRYPT_MODE, key);
75 if( minCipherBits == -1 )
76 minCipherBits = bits;
77 maxCipherBits = bits;
78 }
79 catch(Exception e)
80 {
81 e.printStackTrace();
82 }
83 }
84 System.out.println("Key range: "+minKeyBits+".."+maxKeyBits);
85 System.out.println("Cipher range: "+minCipherBits+".."+maxCipherBits);
86 }
87
88 static void testKey() throws Exception
89 {
90 int size = 8 * 24;
91 KeyGenerator kgen = KeyGenerator.getInstance("Blowfish");
92 kgen.init(size);
93 SecretKey key = kgen.generateKey();
94 byte[] kbytes = key.getEncoded();
95 System.out.println("key.Algorithm = "+key.getAlgorithm());
96 System.out.println("key.Format = "+key.getFormat());
97 System.out.println("key.Encoded Size = "+kbytes.length);
98
99 Cipher cipher = Cipher.getInstance("Blowfish");
100 AlgorithmParameters params = cipher.getParameters();
101 System.out.println("Blowfish.params = "+params);
102 cipher.init(Cipher.ENCRYPT_MODE, key);
103 SealedObject msg = new SealedObject("This is a secret", cipher);
104
105 SecretKeySpec serverKey = new SecretKeySpec(kbytes, "Blowfish");
106 Cipher scipher = Cipher.getInstance("Blowfish");
107 scipher.init(Cipher.DECRYPT_MODE, serverKey);
108 String theMsg = (String ) msg.getObject(scipher);
109 System.out.println("Decrypted: "+theMsg);
110
111 SecureRandom rnd = SecureRandom.getInstance("SHA1PRNG");
112 BigInteger bi = new BigInteger (320, rnd);
113 byte[] k2bytes = bi.toByteArray();
114 SecretKeySpec keySpec = new SecretKeySpec(k2bytes, "Blowfish");
115 System.out.println("key2.Algorithm = "+key.getAlgorithm());
116 System.out.println("key2.Format = "+key.getFormat());
117 System.out.println("key2.Encoded Size = "+kbytes.length);
118 }
119
120 static void testKey2() throws Exception
121 {
122 byte[] key = new byte[40];
123 for(int n = 0; n < 40; n ++)
124 key[n] = (byte) (n+100);
125 String cipherAlgorithm = "Blowfish";
126 Class [] signature = {key.getClass(), String .class};
127 Object [] args = {key, cipherAlgorithm};
128 Object secretKey = null;
129 ClassLoader loader = Thread.currentThread().getContextClassLoader();
130 Class secretKeySpecClass = loader.loadClass("javax.crypto.spec.SecretKeySpec");
131 Constructor ctor = secretKeySpecClass.getDeclaredConstructor(signature);
132 secretKey = ctor.newInstance(args);
133 System.out.println("SecretKey: "+secretKey);
134 }
135 public static void main(String [] args)
136 {
137 try
138 {
139 System.setOut(System.err);
140 TestJCE tst = new TestJCE();
141 tst.testKey2();
143 }
145 catch(Throwable t)
146 {
147 t.printStackTrace();
148 }
149 }
150 }
151 |
Popular Tags |
Java API By Example, From Geeks To Geeks.