Examples of org.syncany.crypto.CipherSpec

org.syncany.crypto.CipherSpec
A cipher spec represents the definition of a cipher/encryption algorithm and the corresponding settings required to instantiate a new cipher object.
Cipher specs are identified by an identifier (id), which will (when the cipher spec is used by the {@link MultiCipherOutputStream}) be written to the output file format. When the file is read by {@link MultiCipherInputStream}, the identifier is looked up using the {@link CipherSpecs} class.
While it would be technically possible to define any kind of cipher using this class, this class restricts the allowed algorithms to a few ones that are considered secure.
Instantiating a cipher spec that does pass the sanity checks will result in a RuntimeException. @author Philipp C. Heckel

  }
    
  @Test
  public void testCreateDerivedKeys() throws InvalidKeySpecException, NoSuchAlgorithmException, NoSuchProviderException {
    SaltedSecretKey masterKey = createDummyMasterKey();    
    CipherSpec cipherSpec = CipherSpecs.getCipherSpec(CipherSpecs.AES_128_GCM);
    
    byte[] derivedKeySalt1 = new byte[] { 1, 2, 3 };
    byte[] derivedKeySalt2 = new byte[] { 1, 2, 3, 4 };


    SaltedSecretKey derivedKey1 = CipherUtil.createDerivedKey(masterKey, derivedKeySalt1, cipherSpec);

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    private void initCipherSpecs(String cipherSpecListStr) throws Exception {
      String[] cipherSpecIdStrs = cipherSpecListStr.split(",");
      
      for (String cipherSpecIdStr : cipherSpecIdStrs) {
        int cipherSpecId = Integer.parseInt(cipherSpecIdStr);
        CipherSpec cipherSpec = CipherSpecs.getCipherSpec(cipherSpecId);
        
        if (cipherSpec == null) {
          throw new Exception("Cannot find cipher suite with ID '"+cipherSpecId+"'");
        }

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  @Test
  public void testCipherSessionWriteKeyReuseCountOfTwo() throws Exception {
    SaltedSecretKey masterKey = createDummyMasterKey();    
    CipherSession cipherSession = new CipherSession(masterKey, 999, 2);
    
    CipherSpec cipherSpecAes128 = CipherSpecs.getCipherSpec(CipherSpecs.AES_128_GCM);
    CipherSpec cipherSpecTwofish128 = CipherSpecs.getCipherSpec(CipherSpecs.TWOFISH_128_GCM);
    
    SaltedSecretKey writeSecretKey1Aes128 = cipherSession.getWriteSecretKey(cipherSpecAes128);
    SaltedSecretKey writeSecretKey2Aes128 = cipherSession.getWriteSecretKey(cipherSpecAes128);
    SaltedSecretKey writeSecretKey3Aes128 = cipherSession.getWriteSecretKey(cipherSpecAes128);

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  @Test
  public void testCipherSessionReadKeyCacheSizeOfThree() throws Exception {
    SaltedSecretKey masterKey = createDummyMasterKey();    
    CipherSession cipherSession = new CipherSession(masterKey, 2, 999);
    
    CipherSpec cipherSpecAes128 = CipherSpecs.getCipherSpec(CipherSpecs.AES_128_GCM);
    
    byte[] readKeySalt1 = CipherUtil.createRandomArray(cipherSpecAes128.getKeySize());
    byte[] readKeySalt2 = CipherUtil.createRandomArray(cipherSpecAes128.getKeySize());
    byte[] readKeySalt3 = CipherUtil.createRandomArray(cipherSpecAes128.getKeySize());        
    
    SaltedSecretKey readSecretKey1Aes128 = cipherSession.getReadSecretKey(cipherSpecAes128, readKeySalt1);
    SaltedSecretKey readSecretKey2Aes128 = cipherSession.getReadSecretKey(cipherSpecAes128, readKeySalt2);
    SaltedSecretKey readSecretKey3Aes128 = cipherSession.getReadSecretKey(cipherSpecAes128, readKeySalt3);

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    assertEquals(availableCipherSpecs.get(CipherSpecs.AES_128_GCM).getAlgorithm(), "AES/GCM/NoPadding");    
  }
  
  @Test
  public void testCipherSpec2() {
    CipherSpec twofish128CipherSpec = CipherSpecs.getCipherSpec(CipherSpecs.TWOFISH_128_GCM);
    
    assertEquals(twofish128CipherSpec.getId(), 2);
    assertEquals(twofish128CipherSpec.getAlgorithm(), "Twofish/GCM/NoPadding");
    assertEquals(twofish128CipherSpec.getKeySize(), 128);
    assertEquals(twofish128CipherSpec.getIvSize(), 128);
    assertEquals(twofish128CipherSpec.needsUnlimitedStrength(), false);
    assertNotNull(twofish128CipherSpec.toString());
  }

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    assertNotNull(twofish128CipherSpec.toString());
  }
  
  @Test
  public void testCipherSpecHashCodeEquals() {
    CipherSpec cipherSpec1 = CipherSpecs.getCipherSpec(CipherSpecs.AES_128_GCM);
    CipherSpec cipherSpec2 = CipherSpecs.getCipherSpec(CipherSpecs.TWOFISH_128_GCM);
    
    assertNotSame(cipherSpec1.hashCode(), cipherSpec2.hashCode());
    assertNotSame(cipherSpec1, cipherSpec2);
    assertEquals(0x01, cipherSpec1.getId());
  }

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      // Choose cipher
      try {
        // Add cipher suites
        for (String cipherSpecIdStr : cipherSpecIdStrs) {
          Integer cipherSpecId = Integer.parseInt(cipherSpecIdStr);
          CipherSpec cipherSpec = availableCipherSpecs.get(cipherSpecId);


          if (cipherSpec == null) {
            throw new Exception();
          }


          if (cipherSpec.needsUnlimitedStrength()) {
            unlimitedStrengthNeeded = true;
          }


          cipherSpecs.add(cipherSpec);
        }

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Related Classes of org.syncany.crypto.CipherSpec

org.syncany.chunk.CipherTransformer

org.syncany.cli.InitCommand

org.syncany.tests.crypto.CipherSessionTest

org.syncany.tests.crypto.CipherSpecsTest

org.syncany.tests.crypto.CipherUtilTest

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