Package org.bouncycastle.crypto.modes

Examples of org.bouncycastle.crypto.modes.AEADBlockCipher

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    // Attack / alter ciphertext (an attacker would do this!)
    byte[] alteredCiphertext = Arrays.clone(originalCiphertext);   
    alteredCiphertext[8] = (byte) (alteredCiphertext[8] ^ 0x08); // <<< Change 100$ to 900$
   
    // Decrypt with BouncyCastle implementation of CipherInputStream
    AEADBlockCipher cipher = new GCMBlockCipher(new AESEngine());
    cipher.init(false, new AEADParameters(new KeyParameter(randomKey), 128, randomIv));
   
    try {
      readFromStream(new org.bouncycastle.crypto.io.CipherInputStream(new ByteArrayInputStream(alteredCiphertext), cipher));
      //             ^^^^^^^^^^^^^^^ INTERESTING PART ^^^^^^^^^^^^^^^^ 
      //
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    byte[] randomIv = createRandomArray(16);   
    byte[] originalPlaintext = createRandomArray(4080); // <<<< 4080 bytes fails, 4079 bytes works!  
    byte[] originalCiphertext = encryptWithAesGcm(originalPlaintext, randomKey, randomIv);
   
    // Decrypt with BouncyCastle implementation of CipherInputStream
    AEADBlockCipher cipher = new GCMBlockCipher(new AESEngine());
    cipher.init(false, new AEADParameters(new KeyParameter(randomKey), 128, randomIv));
   
    try {
      readFromStream(new org.bouncycastle.crypto.io.CipherInputStream(new ByteArrayInputStream(originalCiphertext), cipher));
      //             ^^^^^^^^^^^^^^^ INTERESTING PART ^^^^^^^^^^^^^^^^ 
      //
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    super(id, algorithm, keySize, ivSize, needsUnlimitedStrength);
  }
   
  @Override
  public OutputStream newCipherOutputStream(OutputStream underlyingOutputStream, byte[] secretKey, byte[] iv) throws CipherException {
    AEADBlockCipher cipher = new GCMBlockCipher(new TwofishEngine());
    cipher.init(true, new AEADParameters(new KeyParameter(secretKey), MAC_SIZE, iv));
   
    return new org.bouncycastle.crypto.io.CipherOutputStream(underlyingOutputStream, cipher);
  }
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    return new org.bouncycastle.crypto.io.CipherOutputStream(underlyingOutputStream, cipher);
  }

  @Override
  public InputStream newCipherInputStream(InputStream underlyingInputStream, byte[] secretKey, byte[] iv) throws CipherException {
    AEADBlockCipher cipher = new GCMBlockCipher(new TwofishEngine());
    cipher.init(false, new AEADParameters(new KeyParameter(secretKey), MAC_SIZE, iv));
   
    return new org.bouncycastle.crypto.io.CipherInputStream(underlyingInputStream, cipher);
  }
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    super(id, algorithm, keySize, ivSize, needsUnlimitedStrength);
  }
   
  @Override
  public OutputStream newCipherOutputStream(OutputStream underlyingOutputStream, byte[] secretKey, byte[] iv) throws CipherException {
    AEADBlockCipher cipher = new GCMBlockCipher(new AESEngine());
    cipher.init(true, new AEADParameters(new KeyParameter(secretKey), MAC_SIZE, iv));
   
    return new org.bouncycastle.crypto.io.CipherOutputStream(underlyingOutputStream, cipher);
  }
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    return new org.bouncycastle.crypto.io.CipherOutputStream(underlyingOutputStream, cipher);
  }

  @Override
  public InputStream newCipherInputStream(InputStream underlyingInputStream, byte[] secretKey, byte[] iv) throws CipherException {
    AEADBlockCipher cipher = new GCMBlockCipher(new AESEngine());
    cipher.init(false, new AEADParameters(new KeyParameter(secretKey), MAC_SIZE, iv));
   
    return new org.bouncycastle.crypto.io.CipherInputStream(underlyingInputStream, cipher);
  }
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Related Classes of org.bouncycastle.crypto.modes.AEADBlockCipher

  • org.syncany.crypto.specs.AesGcmCipherSpec
  • org.syncany.crypto.specs.TwofishGcmCipherSpec
  • org.syncany.tests.crypto.AesGcmWithBcInputStreamTest
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