Examples of CipherSession

org.syncany.crypto.CipherSession
The cipher session is used by the {@link MultiCipherOutputStream} and the {@link MultiCipherInputStream} to reference the application's master key, and to temporarily store and retrieve derived secret keys.
While a cipher session does not create a master key, it creates and manages the derived keys using the {@link CipherUtil} class:
- Keys used by {@link MultiCipherOutputStream} (for writing new files) are reused a number of times before a new salted key is created. The main purpose of reusing keys is to increase performance. Because the master key is cryptographically strong, the derived keys can be reused a few times without any drawbacks on security. The class keeps one secret key per {@link CipherSpec}.
- Keys used by {@link MultiCipherInputStream} (when reading files) are cached in order to minimize the amount of keys that have to be created when files are processed.
@author Philipp C. Heckel

Examples of org.syncany.crypto.CipherSession

    this.cipherSession = null;
  }
  
    public CipherTransformer(List<CipherSpec> cipherSpecs, SaltedSecretKey masterKey) {
      this.cipherSpecs = cipherSpecs;
      this.cipherSession = new CipherSession(masterKey);
    }

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Examples of org.syncany.crypto.CipherSession

  private void initCipherSession(String masterKeyStr, String masterKeySaltStr) {
    byte[] masterKeySalt = StringUtil.fromHex(masterKeySaltStr);
    byte[] masterKeyBytes = StringUtil.fromHex(masterKeyStr);
    
    SaltedSecretKey masterKey = new SaltedSecretKey(new SecretKeySpec(masterKeyBytes, "RAW"), masterKeySalt);    
    cipherSession = new CipherSession(masterKey);
  }

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Examples of org.syncany.crypto.CipherSession

  }
  
  @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);
    
    SaltedSecretKey writeSecretKey1Twofish128 = cipherSession.getWriteSecretKey(cipherSpecTwofish128);
    SaltedSecretKey writeSecretKey2Twofish128 = cipherSession.getWriteSecretKey(cipherSpecTwofish128);
    SaltedSecretKey writeSecretKey3Twofish128 = cipherSession.getWriteSecretKey(cipherSpecTwofish128);
        
    assertEquals(writeSecretKey1Aes128, writeSecretKey2Aes128);
    assertNotSame(writeSecretKey1Aes128, writeSecretKey3Aes128);
    
    assertEquals(writeSecretKey1Twofish128, writeSecretKey2Twofish128);

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Examples of org.syncany.crypto.CipherSession

  }  
  
  @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);
    
    assertNotSame(readSecretKey1Aes128, readSecretKey2Aes128);
    assertNotSame(readSecretKey1Aes128, readSecretKey3Aes128);
    assertNotSame(readSecretKey2Aes128, readSecretKey3Aes128);

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