Example usage for org.bouncycastle.crypto.modes SICBlockCipher getBlockSize

Introduction

In this page you can find the example usage for org.bouncycastle.crypto.modes SICBlockCipher getBlockSize.

Prototype

public int getBlockSize() 

Source Link

Usage

From source file:org.bunkr.core.crypto.CipherBuilder.java

License:Open Source License

/**
 * Build a block cipher for encrypting or decrypting the target file.
 *
 * Intelligently create the correct cipher and initialize it correctly from the encryptionData present on the
 * target file. If the goal is encryption, the encryption data for the file is reinitialized from random.
 *
 * @param file the target FileInventoryItem
 * @param encrypting boolean indicating encryption (true) or decryption (false)
 * @return a BlockCipher// ww  w .j av a 2  s .c om
 */
public static BlockCipher buildCipherForFile(FileInventoryItem file, boolean encrypting) {
    Encryption alg = file.getEncryptionAlgorithm();

    if (alg.c.equals(Algorithms.SYMMETRIC_CIPHER.AES)) {
        if (alg.m.equals(Algorithms.SYMMETRIC_MODE.CTR)) {
            SICBlockCipher fileCipher = new SICBlockCipher(new AESEngine());
            byte[] edata = file.getEncryptionData();
            if (encrypting) {
                edata = new byte[alg.keyByteLength + fileCipher.getBlockSize()];
                RandomMaker.fill(edata);
                file.setEncryptionData(edata);
            }
            byte[] ekey = Arrays.copyOfRange(edata, 0, alg.keyByteLength);
            byte[] eiv = Arrays.copyOfRange(edata, alg.keyByteLength,
                    alg.keyByteLength + fileCipher.getBlockSize());
            fileCipher.init(encrypting, new ParametersWithIV(new KeyParameter(ekey), eiv));
            return fileCipher;
        }
    }

    else if (alg.c.equals(Algorithms.SYMMETRIC_CIPHER.TWOFISH)) {
        if (alg.m.equals(Algorithms.SYMMETRIC_MODE.CTR)) {
            SICBlockCipher fileCipher = new SICBlockCipher(new TwofishEngine());
            byte[] edata = file.getEncryptionData();
            if (encrypting) {
                edata = new byte[alg.keyByteLength + fileCipher.getBlockSize()];
                RandomMaker.fill(edata);
                file.setEncryptionData(edata);
            }
            byte[] ekey = Arrays.copyOfRange(edata, 0, alg.keyByteLength);
            byte[] eiv = Arrays.copyOfRange(edata, alg.keyByteLength,
                    alg.keyByteLength + fileCipher.getBlockSize());
            fileCipher.init(encrypting, new ParametersWithIV(new KeyParameter(ekey), eiv));
            return fileCipher;
        }
    }

    throw new IllegalArgumentException(String.format("Unsupported algorithm: %s", alg));
}

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From source file:org.bunkr.core.crypto.CipherBuilder.java

License:Open Source License

/**
 * Simple version of buildCipherForFile, this time without the encryption data manipulation or file object.
 *
 * @param alg the encryption algorithm being used
 * @param key encryption key data bytes/*from  w ww  .  jav  a2  s .c  om*/
 * @param iv initialization vector data bytes
 * @return a BlockCipher
 */
public static BlockCipher buildCipher(Encryption alg, boolean encrypting, byte[] key, byte[] iv) {
    if (key.length != alg.keyByteLength)
        throw new IllegalArgumentException(String.format("Supplied key length %s != required key length %s",
                key.length, alg.keyByteLength));
    if (alg.c.equals(Algorithms.SYMMETRIC_CIPHER.AES)) {
        SICBlockCipher fileCipher = new SICBlockCipher(new AESEngine());
        if (iv.length != fileCipher.getBlockSize())
            throw new IllegalArgumentException(String.format("Supplied iv length %s != required iv length %s",
                    iv.length, fileCipher.getBlockSize()));
        if (alg.m.equals(Algorithms.SYMMETRIC_MODE.CTR)) {
            fileCipher.init(encrypting, new ParametersWithIV(new KeyParameter(key), iv));
            return fileCipher;
        }
    }

    else if (alg.c.equals(Algorithms.SYMMETRIC_CIPHER.TWOFISH)) {
        SICBlockCipher fileCipher = new SICBlockCipher(new TwofishEngine());
        if (iv.length != fileCipher.getBlockSize())
            throw new IllegalArgumentException(String.format("Supplied iv length %s != required iv length %s",
                    iv.length, fileCipher.getBlockSize()));
        if (alg.m.equals(Algorithms.SYMMETRIC_MODE.CTR)) {
            fileCipher.init(encrypting, new ParametersWithIV(new KeyParameter(key), iv));
            return fileCipher;
        }
    }

    throw new IllegalArgumentException(String.format("Unsupported algorithm: %s", alg));
}

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