Examples with CBCBlockCipher org.spongycastle.crypto.modes.CBCBlockCipher used on opensource projects

Example 6 with CBCBlockCipher

use of org.spongycastle.crypto.modes.CBCBlockCipher in project nuls by nuls-io.

the class AESEncrypt method encrypt.

/**
 * 加密
 *
 * @param plainBytes
 * @param iv
 * @param aesKey
 * @return EncryptedData
 */
public static EncryptedData encrypt(byte[] plainBytes, byte[] iv, KeyParameter aesKey) throws NulsRuntimeException {
    Utils.checkNotNull(plainBytes);
    Utils.checkNotNull(aesKey);
    try {
        if (iv == null) {
            iv = new byte[16];
            SECURE_RANDOM.nextBytes(iv);
        }
        ParametersWithIV keyWithIv = new ParametersWithIV(aesKey, iv);
        // Encrypt using AES.
        BufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(new AESFastEngine()));
        cipher.init(true, keyWithIv);
        byte[] encryptedBytes = new byte[cipher.getOutputSize(plainBytes.length)];
        final int length1 = cipher.processBytes(plainBytes, 0, plainBytes.length, encryptedBytes, 0);
        final int length2 = cipher.doFinal(encryptedBytes, length1);
        return new EncryptedData(iv, Arrays.copyOf(encryptedBytes, length1 + length2));
    } catch (Exception e) {
        throw new NulsRuntimeException(e);
    }
}

Example 7 with CBCBlockCipher

use of org.spongycastle.crypto.modes.CBCBlockCipher in project nuls by nuls-io.

the class AESEncrypt method decrypt.

/**
 * 解密
 *
 * @param dataToDecrypt
 * @param aesKey
 * @return byte[]
 * @throws NulsRuntimeException
 */
public static byte[] decrypt(EncryptedData dataToDecrypt, KeyParameter aesKey) throws NulsRuntimeException {
    Utils.checkNotNull(dataToDecrypt);
    Utils.checkNotNull(aesKey);
    try {
        ParametersWithIV keyWithIv = new ParametersWithIV(new KeyParameter(aesKey.getKey()), dataToDecrypt.getInitialisationVector());
        // Decrypt the message.
        BufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(new AESFastEngine()));
        cipher.init(false, keyWithIv);
        byte[] cipherBytes = dataToDecrypt.getEncryptedBytes();
        byte[] decryptedBytes = new byte[cipher.getOutputSize(cipherBytes.length)];
        final int length1 = cipher.processBytes(cipherBytes, 0, cipherBytes.length, decryptedBytes, 0);
        final int length2 = cipher.doFinal(decryptedBytes, length1);
        return Arrays.copyOf(decryptedBytes, length1 + length2);
    } catch (Exception e) {
        throw new NulsRuntimeException(e);
    }
}

Example 8 with CBCBlockCipher

use of org.spongycastle.crypto.modes.CBCBlockCipher in project rskj by rsksmart.

the class KeyCrypterAes method decrypt.

/**
 * Decrypt bytes previously encrypted with this class.
 *
 * @param dataToDecrypt    The data to decrypt
 * @param key              The AES key to use for decryption
 * @return                 The decrypted bytes
 * @throws                 KeyCrypterException if bytes could not be decrypted
 */
@Override
public byte[] decrypt(EncryptedData dataToDecrypt, KeyParameter key) {
    checkNotNull(dataToDecrypt);
    checkNotNull(key);
    try {
        ParametersWithIV keyWithIv = new ParametersWithIV(new KeyParameter(key.getKey()), dataToDecrypt.initialisationVector);
        // Decrypt the message.
        BufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(new AESFastEngine()));
        cipher.init(false, keyWithIv);
        byte[] cipherBytes = dataToDecrypt.encryptedBytes;
        byte[] decryptedBytes = new byte[cipher.getOutputSize(cipherBytes.length)];
        final int length1 = cipher.processBytes(cipherBytes, 0, cipherBytes.length, decryptedBytes, 0);
        final int length2 = cipher.doFinal(decryptedBytes, length1);
        return Arrays.copyOf(decryptedBytes, length1 + length2);
    } catch (Exception e) {
        throw new KeyCrypterException("Could not decrypt bytes", e);
    }
}