DHKeyAgreementTest


1   package net.sourceforge.jcetaglib.test;
2   
3   import junit.framework.Assert;
4   import junit.framework.TestCase;
5   import net.sourceforge.jcetaglib.lib.Crypt;
6   import net.sourceforge.jcetaglib.lib.DHKeyAgreement;
7   
8   import java.security.Key  ;
9   import java.security.KeyPair  ;
10  import java.security.PublicKey  ;
11  
12  public class DHKeyAgreementTest extends TestCase {
13      private StringBuffer   ciphertext = null;
14      private StringBuffer   plaintext = null;
15  
16      public void testAgreement() throws Exception   {
17          // generate key pairs for both parties
18          KeyPair   alicekeypair = DHKeyAgreement.generateDHKeyPair();
19          KeyPair   bobkeypair = DHKeyAgreement.generateDHKeyPair();
20  
21          // public key wrapping
22          byte[] bytealicekey = DHKeyAgreement.publicKeyToBytes(alicekeypair.getPublic()); // send this to Bob
23          byte[] bytebobkey = DHKeyAgreement.publicKeyToBytes(bobkeypair.getPublic()); // send this to Alice
24  
25          // receiving public keys ...
26          PublicKey   alicepub = DHKeyAgreement.bytesToPublicKey(bytealicekey);
27          PublicKey   bobpub = DHKeyAgreement.bytesToPublicKey(bytebobkey);
28  
29          // generate secret session keys for both parties
30          Key   alicekey = DHKeyAgreement.generateSessionKey(bobpub, alicekeypair.getPrivate(), "AES", 256);
31          Key   bobkey = DHKeyAgreement.generateSessionKey(alicepub, bobkeypair.getPrivate(), "AES", 256);
32  
33          Assert.assertEquals(alicekey, bobkey);
34  
35          for (int i = 0; i < RunTest.text.length; i++) {
36              // alice encrypts it with her key
37              ciphertext = Crypt.encrypt(RunTest.text[i]
38                      , alicekey
39                      , "AES"
40                      , "CBC"
41                      , "PKCS7Padding"
42                      , null);
43  
44              // bob decrypts it with his key
45              plaintext = Crypt.decrypt(ciphertext
46                      , bobkey
47                      , "AES"
48                      , "CBC"
49                      , "PKCS7Padding");
50  
51              Assert.assertEquals(plaintext.toString(), RunTest.text[i].toString());
52          }
53      }
54  }
55
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