Package org.bouncycastle.crypto.modes

Examples of org.bouncycastle.crypto.modes.GCMBlockCipher

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            cipher = new AEADGenericBlockCipher(new EAXBlockCipher(baseEngine));
        }
        else if (modeName.startsWith("GCM"))
        {
            ivLength = baseEngine.getBlockSize();
            cipher = new AEADGenericBlockCipher(new GCMBlockCipher(baseEngine));
        }
        else
        {
            throw new NoSuchAlgorithmException("can't support mode " + mode);
        }
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            cipher = new AEADGenericBlockCipher(new EAXBlockCipher(baseEngine));
        }
        else if (modeName.startsWith("GCM"))
        {
            ivLength = baseEngine.getBlockSize();
            cipher = new AEADGenericBlockCipher(new GCMBlockCipher(baseEngine));
        }
        else
        {
            throw new NoSuchAlgorithmException("can't support mode " + mode);
        }
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        AESEngine aesEngine = new AESEngine();

        switch (blockMode) {

        case GCM:
            return new GCMBlockCipher(aesEngine);
        default:
            throw new RuntimeException("Block cipher not found");
        }
    }
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        AESEngine aesEngine = new AESEngine();

        switch (blockMode) {

        case GCM:
            return new GCMBlockCipher(aesEngine);
        default:
            throw new RuntimeException("Block cipher not found");
        }
    }
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        AESEngine aesEngine = new AESEngine();

        switch (blockMode) {

        case GCM:
            return new GCMBlockCipher(aesEngine);
        default:
            throw new RuntimeException("Block cipher not found");
        }
    }
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    // Initialise AES cipher
    BlockCipher cipher = AES.createCipher(secretKey, forEncryption);

    // Create GCM cipher with AES
    GCMBlockCipher gcm = new GCMBlockCipher(cipher);

    AEADParameters aeadParams = new AEADParameters(new KeyParameter(secretKey.getEncoded()),
                                             AUTH_TAG_BIT_LENGTH,
                                             iv,
                                             authData);
    gcm.init(forEncryption, aeadParams);

    return gcm;
  }
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                                          final byte[] plainText,
                                          final byte[] authData)
    throws RuntimeException {

    // Initialise AES/GCM cipher for encryption
    GCMBlockCipher cipher = createAESGCMCipher(secretKey, true, iv, authData);


    // Prepare output buffer
    int outputLength = cipher.getOutputSize(plainText.length);
    byte[] output = new byte[outputLength];


    // Produce cipher text
    int outputOffset = cipher.processBytes(plainText, 0, plainText.length, output, 0);


    // Produce authentication tag
    try {
      outputOffset += cipher.doFinal(output, outputOffset);

    } catch (InvalidCipherTextException e) {

      throw new RuntimeException("Couldn't generate GCM authentication tag: " + e.getMessage(), e);
    }
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                         final byte[] authData,
                         final byte[] authTag)
    throws RuntimeException {

    // Initialise AES/GCM cipher for decryption
    GCMBlockCipher cipher = createAESGCMCipher(secretKey, false, iv, authData);


    // Join cipher text and authentication tag to produce cipher input
    byte[] input = new byte[cipherText.length + authTag.length];

    System.arraycopy(cipherText, 0, input, 0, cipherText.length);
    System.arraycopy(authTag, 0, input, cipherText.length, authTag.length);

    int outputLength = cipher.getOutputSize(input.length);

    byte[] output = new byte[outputLength];


    // Decrypt
    int outputOffset = cipher.processBytes(input, 0, input.length, output, 0);

    // Validate authentication tag
    try {
      outputOffset += cipher.doFinal(output, outputOffset);
       
    } catch (InvalidCipherTextException e) {

      throw new RuntimeException("Couldn't validate GCM authentication tag: " + e.getMessage(), e);
    }
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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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Related Classes of org.bouncycastle.crypto.modes.GCMBlockCipher

  • com.nimbusds.jose.crypto.AESGCM
  • com.nimbusds.jose.crypto.AESGCMKW
  • org.bouncycastle.crypto.modes.gcm.Tables1kGCMExponentiator
  • org.bouncycastle.crypto.modes.gcm.Tables8kGCMMultiplier
  • org.bouncycastle.crypto.params.AEADParameters
  • org.bouncycastle.crypto.params.KeyParameter
  • org.bouncycastle.crypto.params.ParametersWithIV
  • org.bouncycastle.crypto.tls.DefaultTlsCipherFactory
  • org.bouncycastle.jcajce.provider.symmetric.AES$AESGMAC
  • org.bouncycastle.jcajce.provider.symmetric.Camellia$GMAC
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