org.bouncycastle.crypto.io.CipherInputStream Java Examples

/**
 * Encrypt or decrypt data with AES256.
 *
 * @param data The data to encrypt.
 * @param output The output to write the encrypted data to.
 *
 * @throws IOException If there is an error reading the data.
 */
private void decryptDataAES256(InputStream data, OutputStream output) throws IOException
{
    byte[] iv = new byte[16];

    // read IV from stream
    int ivSize = data.read(iv);
    if (ivSize == -1)
    {
        return;
    }

    if (ivSize != iv.length)
    {
        throw new IOException("AES initialization vector not fully read: only " + ivSize
                + " bytes read instead of " + iv.length);
    }
    PaddedBufferedBlockCipher cipher = new PaddedBufferedBlockCipher(
            new CBCBlockCipher(new AESFastEngine()));
    cipher.init(false, new ParametersWithIV(new KeyParameter(encryptionKey), iv));
    try (CipherInputStream cis = new CipherInputStream(data, cipher))
    {
        IOUtils.copy(cis, output);
    }
}
 

public static InputStream setupInputStream(InputStream is, byte[] keyAndIv) {
    if (keyAndIv != null && keyAndIv.length == 48) {
        byte[] key = new byte[32];
        byte[] iv = new byte[16];
        System.arraycopy(keyAndIv, 0, iv, 0, 16);
        System.arraycopy(keyAndIv, 16, key, 0, 32);
        AEADBlockCipher cipher = new GCMBlockCipher(new AESEngine());
        cipher.init(true, new AEADParameters(new KeyParameter(key), 128, iv));
        return new CipherInputStream(is, cipher);
    } else {
        return is;
    }
}
 

public static InputStream upgrade(DownloadableFile file, InputStream is) throws InvalidAlgorithmParameterException, NoSuchAlgorithmException, InvalidKeyException, NoSuchPaddingException, NoSuchProviderException {
    if (file.getKey() != null && file.getIv() != null) {
        AEADBlockCipher cipher = new GCMBlockCipher(new AESEngine());
        cipher.init(true, new AEADParameters(new KeyParameter(file.getKey()), 128, file.getIv()));
        return new CipherInputStream(is, cipher);
    } else {
        return is;
    }
}
 

public CipherInputStream newCipherInputStream(InputStream is, byte[] password) throws IOException {
    byte[] salt = IOUtils.readFully(is, saltLength);
    byte[] nonce = IOUtils.readFully(is, nonceLength);
    byte[] dk = kdf.apply(password, salt);
    GCMBlockCipher cipher = new GCMBlockCipher(new AESEngine());
    AEADParameters parameters = new AEADParameters(new KeyParameter(dk), tagLength * 8, nonce);
    cipher.init(false, parameters);
    return new CipherInputStream(is, cipher);
}
 

public static InputStream upgrade(DownloadableFile file, InputStream is) throws InvalidAlgorithmParameterException, NoSuchAlgorithmException, InvalidKeyException, NoSuchPaddingException, NoSuchProviderException {
    if (file.getKey() != null && file.getIv() != null) {
        AEADBlockCipher cipher = new GCMBlockCipher(new AESEngine());
        cipher.init(true, new AEADParameters(new KeyParameter(file.getKey()), 128, file.getIv()));
        return new CipherInputStream(is, cipher);
    } else {
        return is;
    }
}
 

public static InputStream decryptInputStream(SecretKey par0SecretKey, InputStream par1InputStream) {
    return new CipherInputStream(par1InputStream, createBufferedBlockCipher(false, par0SecretKey));
}
 

public static InputStream decryptInputStream(InputStream inputStream, SecretKey key) {
	return new CipherInputStream(inputStream, createBlockCipher(key, false));
}
 

CipherInputStream cipherInputStream(InputStream inputStream, byte[] key, byte[] checksum) {
    CFBBlockCipher cipher = new CFBBlockCipher(new AESFastEngine(), 128);
    KeyParameter keyParameter = new KeyParameter(key);
    cipher.init(false, keyParameter);
    return new CipherInputStream(inputStream, cipher);
}
 

static InputStream decryptStream(InputStream in, XFileKey keyCipher) {
    BlockCipher cipher = keyCipher.ciphers().get();
    cipher.init(false, new KeyParameter(keyCipher.key()));
    return new CipherInputStream(in, new BufferedBlockCipher(cipher));
}
 

@Override
public InputStream encryptStream(InputStream data, byte[] key, byte[] iv)
{
    init(key, iv);
    return new CipherInputStream(data, cipher);
}
 

@Override
public InputStream encryptStream(InputStream data, byte[] key)
{
    init(key);
    return new CipherInputStream(data, cipher);
}
 

public static InputStream decryptInputStream(InputStream inputStream, SecretKey key) {
	return new CipherInputStream(inputStream, createBlockCipher(key, false));
}