Examples with IvParameterSpec javax.crypto.spec.IvParameterSpec used on opensource projects

Example 36 with IvParameterSpec

use of javax.crypto.spec.IvParameterSpec in project XobotOS by xamarin.

the class JCEStreamCipher method engineInit.

protected void engineInit(int opmode, Key key, AlgorithmParameterSpec params, SecureRandom random) throws InvalidKeyException, InvalidAlgorithmParameterException {
    CipherParameters param;
    this.pbeSpec = null;
    this.pbeAlgorithm = null;
    this.engineParams = null;
    //
    if (!(key instanceof SecretKey)) {
        throw new InvalidKeyException("Key for algorithm " + key.getAlgorithm() + " not suitable for symmetric enryption.");
    }
    if (key instanceof JCEPBEKey) {
        JCEPBEKey k = (JCEPBEKey) key;
        if (k.getOID() != null) {
            pbeAlgorithm = k.getOID().getId();
        } else {
            pbeAlgorithm = k.getAlgorithm();
        }
        if (k.getParam() != null) {
            param = k.getParam();
            pbeSpec = new PBEParameterSpec(k.getSalt(), k.getIterationCount());
        } else if (params instanceof PBEParameterSpec) {
            param = PBE.Util.makePBEParameters(k, params, cipher.getAlgorithmName());
            pbeSpec = (PBEParameterSpec) params;
        } else {
            throw new InvalidAlgorithmParameterException("PBE requires PBE parameters to be set.");
        }
        if (k.getIvSize() != 0) {
            ivParam = (ParametersWithIV) param;
        }
    } else if (params == null) {
        param = new KeyParameter(key.getEncoded());
    } else if (params instanceof IvParameterSpec) {
        param = new ParametersWithIV(new KeyParameter(key.getEncoded()), ((IvParameterSpec) params).getIV());
        ivParam = (ParametersWithIV) param;
    } else {
        throw new IllegalArgumentException("unknown parameter type.");
    }
    if ((ivLength != 0) && !(param instanceof ParametersWithIV)) {
        SecureRandom ivRandom = random;
        if (ivRandom == null) {
            ivRandom = new SecureRandom();
        }
        if ((opmode == Cipher.ENCRYPT_MODE) || (opmode == Cipher.WRAP_MODE)) {
            byte[] iv = new byte[ivLength];
            ivRandom.nextBytes(iv);
            param = new ParametersWithIV(param, iv);
            ivParam = (ParametersWithIV) param;
        } else {
            throw new InvalidAlgorithmParameterException("no IV set when one expected");
        }
    }
    switch(opmode) {
        case Cipher.ENCRYPT_MODE:
        case Cipher.WRAP_MODE:
            cipher.init(true, param);
            break;
        case Cipher.DECRYPT_MODE:
        case Cipher.UNWRAP_MODE:
            cipher.init(false, param);
            break;
        default:
            System.out.println("eeek!");
    }
}

Example 37 with IvParameterSpec

use of javax.crypto.spec.IvParameterSpec in project android_frameworks_base by ResurrectionRemix.

the class CryptoHelper method decryptBundle.

@Nullable
/* default */
Bundle decryptBundle(@NonNull Bundle bundle) throws GeneralSecurityException {
    Preconditions.checkNotNull(bundle, "Cannot decrypt null bundle.");
    byte[] iv = bundle.getByteArray(KEY_IV);
    byte[] encryptedBytes = bundle.getByteArray(KEY_CIPHER);
    byte[] mac = bundle.getByteArray(KEY_MAC);
    if (!verifyMac(encryptedBytes, iv, mac)) {
        Log.w(TAG, "Escrow mac mismatched!");
        return null;
    }
    IvParameterSpec ivSpec = new IvParameterSpec(iv);
    Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
    cipher.init(Cipher.DECRYPT_MODE, mEncryptionKey, ivSpec);
    byte[] decryptedBytes = cipher.doFinal(encryptedBytes);
    Parcel decryptedParcel = Parcel.obtain();
    decryptedParcel.unmarshall(decryptedBytes, 0, decryptedBytes.length);
    decryptedParcel.setDataPosition(0);
    Bundle decryptedBundle = new Bundle();
    decryptedBundle.readFromParcel(decryptedParcel);
    decryptedParcel.recycle();
    return decryptedBundle;
}

Example 38 with IvParameterSpec

use of javax.crypto.spec.IvParameterSpec in project wechat by motianhuo.

the class DES method decryptDES.

/**
	 * 数据解密
	 * 
	 * @param decryptString
	 * @return
	 * @throws Exception
	 */
public static String decryptDES(String decryptString) throws Exception {
    byte[] byteMi = new BASE64().decode(decryptString);
    IvParameterSpec zeroIv = new IvParameterSpec(iv);
    SecretKeySpec key = new SecretKeySpec(getkeys().getBytes(), "DES");
    Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
    cipher.init(Cipher.DECRYPT_MODE, key, zeroIv);
    byte[] decryptedData = cipher.doFinal(byteMi);
    return new String(decryptedData);
}

Example 39 with IvParameterSpec

use of javax.crypto.spec.IvParameterSpec in project perun by CESNET.

the class Utils method cipherInput.

/**
	 * Return en/decrypted version of input using AES/CBC/PKCS5PADDING cipher.
	 * Perun's internal secretKey and initVector are used (you can configure them in
	 * perun.properties file).
	 *
	 * @param plainText text to en/decrypt
	 * @param decrypt TRUE = decrypt input / FALSE = encrypt input
	 * @return en/decrypted text
	 * @throws cz.metacentrum.perun.core.api.exceptions.InternalErrorException if anything fails
	 */
public static String cipherInput(String plainText, boolean decrypt) throws InternalErrorException {
    try {
        String encryptionKey = BeansUtils.getCoreConfig().getPwdresetSecretKey();
        String initVector = BeansUtils.getCoreConfig().getPwdresetInitVector();
        Cipher c = Cipher.getInstance("AES/CBC/PKCS5PADDING");
        SecretKeySpec k = new SecretKeySpec(encryptionKey.getBytes("UTF-8"), "AES");
        c.init((decrypt) ? Cipher.DECRYPT_MODE : Cipher.ENCRYPT_MODE, k, new IvParameterSpec(initVector.getBytes("UTF-8")));
        if (decrypt) {
            byte[] bytes = Base64.decodeBase64(plainText.getBytes("UTF-8"));
            return new String(c.doFinal(bytes), "UTF-8");
        } else {
            byte[] bytes = Base64.encodeBase64(c.doFinal(plainText.getBytes("UTF-8")));
            return new String(bytes, "UTF-8");
        }
    } catch (Exception ex) {
        throw new InternalErrorException("Error when encrypting message", ex);
    }
}

Example 40 with IvParameterSpec

use of javax.crypto.spec.IvParameterSpec in project graylog2-server by Graylog2.

the class AESTools method decrypt.

@Nullable
public static String decrypt(String cipherText, String encryptionKey, String salt) {
    try {
        @SuppressFBWarnings("CIPHER_INTEGRITY") Cipher cipher = Cipher.getInstance("AES/CBC/ISO10126Padding", "SunJCE");
        SecretKeySpec key = new SecretKeySpec(encryptionKey.getBytes("UTF-8"), "AES");
        cipher.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(salt.getBytes("UTF-8")));
        return new String(cipher.doFinal(Hex.decode(cipherText)), "UTF-8");
    } catch (Exception e) {
        LOG.error("Could not decrypt value.", e);
    }
    return null;
}