Examples with RC2Parameters com.github.zhenwei.core.crypto.params.RC2Parameters used on opensource projects

Example 1 with RC2Parameters

use of com.github.zhenwei.core.crypto.params.RC2Parameters in project LinLong-Java by zhenwei1108.

the class RC2Engine method init.

/**
 * initialise a RC2 cipher.
 *
 * @param encrypting whether or not we are for encryption.
 * @param params     the parameters required to set up the cipher.
 * @throws IllegalArgumentException if the params argument is inappropriate.
 */
public void init(boolean encrypting, CipherParameters params) {
    this.encrypting = encrypting;
    if (params instanceof RC2Parameters) {
        RC2Parameters param = (RC2Parameters) params;
        workingKey = generateWorkingKey(param.getKey(), param.getEffectiveKeyBits());
    } else if (params instanceof KeyParameter) {
        byte[] key = ((KeyParameter) params).getKey();
        workingKey = generateWorkingKey(key, key.length * 8);
    } else {
        throw new IllegalArgumentException("invalid parameter passed to RC2 init - " + params.getClass().getName());
    }
}

Example 2 with RC2Parameters

use of com.github.zhenwei.core.crypto.params.RC2Parameters in project LinLong-Java by zhenwei1108.

the class BaseMac method engineInit.

protected void engineInit(Key key, final AlgorithmParameterSpec params) throws InvalidKeyException, InvalidAlgorithmParameterException {
    CipherParameters param;
    if (key == null) {
        throw new InvalidKeyException("key is null");
    }
    if (key instanceof PKCS12Key) {
        SecretKey k;
        PBEParameterSpec pbeSpec;
        try {
            k = (SecretKey) key;
        } catch (Exception e) {
            throw new InvalidKeyException("PKCS12 requires a SecretKey/PBEKey");
        }
        try {
            pbeSpec = (PBEParameterSpec) params;
        } catch (Exception e) {
            throw new InvalidAlgorithmParameterException("PKCS12 requires a PBEParameterSpec");
        }
        if (k instanceof PBEKey && pbeSpec == null) {
            pbeSpec = new PBEParameterSpec(((PBEKey) k).getSalt(), ((PBEKey) k).getIterationCount());
        }
        int digest = SHA1;
        int keySize = 160;
        if (macEngine.getAlgorithmName().startsWith("GOST")) {
            digest = GOST3411;
            keySize = 256;
        } else if (macEngine instanceof HMac) {
            if (!macEngine.getAlgorithmName().startsWith("SHA-1")) {
                if (macEngine.getAlgorithmName().startsWith("SHA-224")) {
                    digest = SHA224;
                    keySize = 224;
                } else if (macEngine.getAlgorithmName().startsWith("SHA-256")) {
                    digest = SHA256;
                    keySize = 256;
                } else if (macEngine.getAlgorithmName().startsWith("SHA-384")) {
                    digest = SHA384;
                    keySize = 384;
                } else if (macEngine.getAlgorithmName().startsWith("SHA-512")) {
                    digest = SHA512;
                    keySize = 512;
                } else if (macEngine.getAlgorithmName().startsWith("RIPEMD160")) {
                    digest = RIPEMD160;
                    keySize = 160;
                } else {
                    throw new InvalidAlgorithmParameterException("no PKCS12 mapping for HMAC: " + macEngine.getAlgorithmName());
                }
            }
        }
        // TODO: add correct handling for other digests
        param = Util.makePBEMacParameters(k, PKCS12, digest, keySize, pbeSpec);
    } else if (key instanceof BCPBEKey) {
        BCPBEKey k = (BCPBEKey) key;
        if (k.getParam() != null) {
            param = k.getParam();
        } else if (params instanceof PBEParameterSpec) {
            param = Util.makePBEMacParameters(k, params);
        } else {
            throw new InvalidAlgorithmParameterException("PBE requires PBE parameters to be set.");
        }
    } else {
        if (params instanceof PBEParameterSpec) {
            throw new InvalidAlgorithmParameterException("inappropriate parameter type: " + params.getClass().getName());
        }
        param = new KeyParameter(key.getEncoded());
    }
    final KeyParameter keyParam;
    if (param instanceof ParametersWithIV) {
        keyParam = (KeyParameter) ((ParametersWithIV) param).getParameters();
    } else {
        keyParam = (KeyParameter) param;
    }
    if (params instanceof AEADParameterSpec) {
        AEADParameterSpec aeadSpec = (AEADParameterSpec) params;
        param = new AEADParameters(keyParam, aeadSpec.getMacSizeInBits(), aeadSpec.getNonce(), aeadSpec.getAssociatedData());
    } else if (params instanceof IvParameterSpec) {
        param = new ParametersWithIV(keyParam, ((IvParameterSpec) params).getIV());
    } else if (params instanceof RC2ParameterSpec) {
        param = new ParametersWithIV(new RC2Parameters(keyParam.getKey(), ((RC2ParameterSpec) params).getEffectiveKeyBits()), ((RC2ParameterSpec) params).getIV());
    } else if (params instanceof SkeinParameterSpec) {
        param = new SkeinParameters.Builder(copyMap(((SkeinParameterSpec) params).getParameters())).setKey(keyParam.getKey()).build();
    } else if (params == null) {
        param = new KeyParameter(key.getEncoded());
    } else if (gcmSpecClass != null && gcmSpecClass.isAssignableFrom(params.getClass())) {
        param = GcmSpecUtil.extractAeadParameters(keyParam, params);
    } else if (!(params instanceof PBEParameterSpec)) {
        throw new InvalidAlgorithmParameterException("unknown parameter type: " + params.getClass().getName());
    }
    try {
        macEngine.init(param);
    } catch (Exception e) {
        throw new InvalidAlgorithmParameterException("cannot initialize MAC: " + e.getMessage());
    }
}

Example 3 with RC2Parameters

use of com.github.zhenwei.core.crypto.params.RC2Parameters in project LinLong-Java by zhenwei1108.

the class BaseBlockCipher method engineInit.

protected void engineInit(int opmode, Key key, final AlgorithmParameterSpec params, SecureRandom random) throws InvalidKeyException, InvalidAlgorithmParameterException {
    CipherParameters param;
    this.pbeSpec = null;
    this.pbeAlgorithm = null;
    this.engineParams = null;
    this.aeadParams = null;
    // 
    if (!(key instanceof SecretKey)) {
        throw new InvalidKeyException("Key for algorithm " + ((key != null) ? key.getAlgorithm() : null) + " not suitable for symmetric enryption.");
    }
    // 
    if (params == null && (baseEngine != null && baseEngine.getAlgorithmName().startsWith("RC5-64"))) {
        throw new InvalidAlgorithmParameterException("RC5 requires an RC5ParametersSpec to be passed in.");
    }
    // 
    if (scheme == PKCS12 || key instanceof PKCS12Key) {
        SecretKey k;
        try {
            k = (SecretKey) key;
        } catch (Exception e) {
            throw new InvalidKeyException("PKCS12 requires a SecretKey/PBEKey");
        }
        if (params instanceof PBEParameterSpec) {
            pbeSpec = (PBEParameterSpec) params;
        }
        if (k instanceof PBEKey && pbeSpec == null) {
            PBEKey pbeKey = (PBEKey) k;
            if (pbeKey.getSalt() == null) {
                throw new InvalidAlgorithmParameterException("PBEKey requires parameters to specify salt");
            }
            pbeSpec = new PBEParameterSpec(pbeKey.getSalt(), pbeKey.getIterationCount());
        }
        if (pbeSpec == null && !(k instanceof PBEKey)) {
            throw new InvalidKeyException("Algorithm requires a PBE key");
        }
        if (key instanceof BCPBEKey) {
            // PKCS#12 sets an IV, if we get a key that doesn't have ParametersWithIV we need to reject it. If the
            // key has no parameters it means it's an old-school JCE PBE Key - we use getEncoded() on it.
            CipherParameters pbeKeyParam = ((BCPBEKey) key).getParam();
            if (pbeKeyParam instanceof ParametersWithIV) {
                param = pbeKeyParam;
            } else if (pbeKeyParam == null) {
                param = Util.makePBEParameters(k.getEncoded(), PKCS12, digest, keySizeInBits, ivLength * 8, pbeSpec, cipher.getAlgorithmName());
            } else {
                throw new InvalidKeyException("Algorithm requires a PBE key suitable for PKCS12");
            }
        } else {
            param = Util.makePBEParameters(k.getEncoded(), PKCS12, digest, keySizeInBits, ivLength * 8, pbeSpec, cipher.getAlgorithmName());
        }
        if (param instanceof ParametersWithIV) {
            ivParam = (ParametersWithIV) param;
        }
    } else if (key instanceof PBKDF1Key) {
        PBKDF1Key k = (PBKDF1Key) key;
        if (params instanceof PBEParameterSpec) {
            pbeSpec = (PBEParameterSpec) params;
        }
        if (k instanceof PBKDF1KeyWithParameters && pbeSpec == null) {
            pbeSpec = new PBEParameterSpec(((PBKDF1KeyWithParameters) k).getSalt(), ((PBKDF1KeyWithParameters) k).getIterationCount());
        }
        param = Util.makePBEParameters(k.getEncoded(), PKCS5S1, digest, keySizeInBits, ivLength * 8, pbeSpec, cipher.getAlgorithmName());
        if (param instanceof ParametersWithIV) {
            ivParam = (ParametersWithIV) param;
        }
    } else if (key instanceof BCPBEKey) {
        BCPBEKey k = (BCPBEKey) key;
        if (k.getOID() != null) {
            pbeAlgorithm = k.getOID().getId();
        } else {
            pbeAlgorithm = k.getAlgorithm();
        }
        if (k.getParam() != null) {
            param = adjustParameters(params, k.getParam());
        } else if (params instanceof PBEParameterSpec) {
            pbeSpec = (PBEParameterSpec) params;
            param = Util.makePBEParameters(k, params, cipher.getUnderlyingCipher().getAlgorithmName());
        } else {
            throw new InvalidAlgorithmParameterException("PBE requires PBE parameters to be set.");
        }
        if (param instanceof ParametersWithIV) {
            ivParam = (ParametersWithIV) param;
        }
    } else if (key instanceof PBEKey) {
        PBEKey k = (PBEKey) key;
        pbeSpec = (PBEParameterSpec) params;
        if (k instanceof PKCS12KeyWithParameters && pbeSpec == null) {
            pbeSpec = new PBEParameterSpec(k.getSalt(), k.getIterationCount());
        }
        param = Util.makePBEParameters(k.getEncoded(), scheme, digest, keySizeInBits, ivLength * 8, pbeSpec, cipher.getAlgorithmName());
        if (param instanceof ParametersWithIV) {
            ivParam = (ParametersWithIV) param;
        }
    } else if (!(key instanceof RepeatedSecretKeySpec)) {
        if (scheme == PKCS5S1 || scheme == PKCS5S1_UTF8 || scheme == PKCS5S2 || scheme == PKCS5S2_UTF8) {
            throw new InvalidKeyException("Algorithm requires a PBE key");
        }
        param = new KeyParameter(key.getEncoded());
    } else {
        param = null;
    }
    if (params instanceof AEADParameterSpec) {
        if (!isAEADModeName(modeName) && !(cipher instanceof AEADGenericBlockCipher)) {
            throw new InvalidAlgorithmParameterException("AEADParameterSpec can only be used with AEAD modes.");
        }
        AEADParameterSpec aeadSpec = (AEADParameterSpec) params;
        KeyParameter keyParam;
        if (param instanceof ParametersWithIV) {
            keyParam = (KeyParameter) ((ParametersWithIV) param).getParameters();
        } else {
            keyParam = (KeyParameter) param;
        }
        param = aeadParams = new AEADParameters(keyParam, aeadSpec.getMacSizeInBits(), aeadSpec.getNonce(), aeadSpec.getAssociatedData());
    } else if (params instanceof IvParameterSpec) {
        if (ivLength != 0) {
            IvParameterSpec p = (IvParameterSpec) params;
            if (p.getIV().length != ivLength && !(cipher instanceof AEADGenericBlockCipher) && fixedIv) {
                throw new InvalidAlgorithmParameterException("IV must be " + ivLength + " bytes long.");
            }
            if (param instanceof ParametersWithIV) {
                param = new ParametersWithIV(((ParametersWithIV) param).getParameters(), p.getIV());
            } else {
                param = new ParametersWithIV(param, p.getIV());
            }
            ivParam = (ParametersWithIV) param;
        } else {
            if (modeName != null && modeName.equals("ECB")) {
                throw new InvalidAlgorithmParameterException("ECB mode does not use an IV");
            }
        }
    } else if (params instanceof GOST28147ParameterSpec) {
        GOST28147ParameterSpec gost28147Param = (GOST28147ParameterSpec) params;
        param = new ParametersWithSBox(new KeyParameter(key.getEncoded()), ((GOST28147ParameterSpec) params).getSbox());
        if (gost28147Param.getIV() != null && ivLength != 0) {
            if (param instanceof ParametersWithIV) {
                param = new ParametersWithIV(((ParametersWithIV) param).getParameters(), gost28147Param.getIV());
            } else {
                param = new ParametersWithIV(param, gost28147Param.getIV());
            }
            ivParam = (ParametersWithIV) param;
        }
    } else if (params instanceof RC2ParameterSpec) {
        RC2ParameterSpec rc2Param = (RC2ParameterSpec) params;
        param = new RC2Parameters(key.getEncoded(), ((RC2ParameterSpec) params).getEffectiveKeyBits());
        if (rc2Param.getIV() != null && ivLength != 0) {
            if (param instanceof ParametersWithIV) {
                param = new ParametersWithIV(((ParametersWithIV) param).getParameters(), rc2Param.getIV());
            } else {
                param = new ParametersWithIV(param, rc2Param.getIV());
            }
            ivParam = (ParametersWithIV) param;
        }
    } else if (params instanceof RC5ParameterSpec) {
        RC5ParameterSpec rc5Param = (RC5ParameterSpec) params;
        param = new RC5Parameters(key.getEncoded(), ((RC5ParameterSpec) params).getRounds());
        if (baseEngine.getAlgorithmName().startsWith("RC5")) {
            if (baseEngine.getAlgorithmName().equals("RC5-32")) {
                if (rc5Param.getWordSize() != 32) {
                    throw new InvalidAlgorithmParameterException("RC5 already set up for a word size of 32 not " + rc5Param.getWordSize() + ".");
                }
            } else if (baseEngine.getAlgorithmName().equals("RC5-64")) {
                if (rc5Param.getWordSize() != 64) {
                    throw new InvalidAlgorithmParameterException("RC5 already set up for a word size of 64 not " + rc5Param.getWordSize() + ".");
                }
            }
        } else {
            throw new InvalidAlgorithmParameterException("RC5 parameters passed to a cipher that is not RC5.");
        }
        if ((rc5Param.getIV() != null) && (ivLength != 0)) {
            if (param instanceof ParametersWithIV) {
                param = new ParametersWithIV(((ParametersWithIV) param).getParameters(), rc5Param.getIV());
            } else {
                param = new ParametersWithIV(param, rc5Param.getIV());
            }
            ivParam = (ParametersWithIV) param;
        }
    } else if (params instanceof FPEParameterSpec) {
        FPEParameterSpec spec = (FPEParameterSpec) params;
        param = new FPEParameters((KeyParameter) param, spec.getRadix(), spec.getTweak(), spec.isUsingInverseFunction());
    } else if (gcmSpecClass != null && gcmSpecClass.isInstance(params)) {
        if (!isAEADModeName(modeName) && !(cipher instanceof AEADGenericBlockCipher)) {
            throw new InvalidAlgorithmParameterException("GCMParameterSpec can only be used with AEAD modes.");
        }
        final KeyParameter keyParam;
        if (param instanceof ParametersWithIV) {
            keyParam = (KeyParameter) ((ParametersWithIV) param).getParameters();
        } else {
            keyParam = (KeyParameter) param;
        }
        param = aeadParams = GcmSpecUtil.extractAeadParameters(keyParam, params);
    } else if (params != null && !(params instanceof PBEParameterSpec)) {
        throw new InvalidAlgorithmParameterException("unknown parameter type.");
    }
    if ((ivLength != 0) && !(param instanceof ParametersWithIV) && !(param instanceof AEADParameters)) {
        SecureRandom ivRandom = random;
        if (ivRandom == null) {
            ivRandom = CryptoServicesRegistrar.getSecureRandom();
        }
        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 if (cipher.getUnderlyingCipher().getAlgorithmName().indexOf("PGPCFB") < 0) {
            throw new InvalidAlgorithmParameterException("no IV set when one expected");
        }
    }
    if (random != null && padded) {
        param = new ParametersWithRandom(param, random);
    }
    try {
        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:
                throw new InvalidParameterException("unknown opmode " + opmode + " passed");
        }
        if (cipher instanceof AEADGenericBlockCipher && aeadParams == null) {
            AEADCipher aeadCipher = ((AEADGenericBlockCipher) cipher).cipher;
            aeadParams = new AEADParameters((KeyParameter) ivParam.getParameters(), aeadCipher.getMac().length * 8, ivParam.getIV());
        }
    } catch (IllegalArgumentException e) {
        throw new InvalidAlgorithmParameterException(e.getMessage(), e);
    } catch (Exception e) {
        throw new InvalidKeyOrParametersException(e.getMessage(), e);
    }
}

Example 4 with RC2Parameters

use of com.github.zhenwei.core.crypto.params.RC2Parameters in project LinLong-Java by zhenwei1108.

the class PEMUtilities method crypt.

static byte[] crypt(boolean encrypt, byte[] bytes, char[] password, String dekAlgName, byte[] iv) throws PEMException {
    byte[] ivValue = iv;
    String blockMode = "CBC";
    BlockCipher engine;
    BlockCipherPadding padding = new PKCS7Padding();
    KeyParameter sKey;
    // Figure out block mode and padding.
    if (dekAlgName.endsWith("-CFB")) {
        blockMode = "CFB";
        padding = null;
    }
    if (dekAlgName.endsWith("-ECB") || "DES-EDE".equals(dekAlgName) || "DES-EDE3".equals(dekAlgName)) {
        // ECB is actually the default (though seldom used) when OpenSSL
        // uses DES-EDE (des2) or DES-EDE3 (des3).
        blockMode = "ECB";
        ivValue = null;
    }
    if (dekAlgName.endsWith("-OFB")) {
        blockMode = "OFB";
        padding = null;
    }
    // Figure out algorithm and key size.
    if (dekAlgName.startsWith("DES-EDE")) {
        // "DES-EDE" is actually des2 in OpenSSL-speak!
        // "DES-EDE3" is des3.
        boolean des2 = !dekAlgName.startsWith("DES-EDE3");
        sKey = getKey(password, 24, iv, des2);
        engine = new DESedeEngine();
    } else if (dekAlgName.startsWith("DES-")) {
        sKey = getKey(password, 8, iv);
        engine = new DESEngine();
    } else if (dekAlgName.startsWith("BF-")) {
        sKey = getKey(password, 16, iv);
        engine = new BlowfishEngine();
    } else if (dekAlgName.startsWith("RC2-")) {
        int keyBits = 128;
        if (dekAlgName.startsWith("RC2-40-")) {
            keyBits = 40;
        } else if (dekAlgName.startsWith("RC2-64-")) {
            keyBits = 64;
        }
        sKey = new RC2Parameters(getKey(password, keyBits / 8, iv).getKey(), keyBits);
        ;
        engine = new RC2Engine();
    } else if (dekAlgName.startsWith("AES-")) {
        byte[] salt = iv;
        if (salt.length > 8) {
            salt = new byte[8];
            System.arraycopy(iv, 0, salt, 0, 8);
        }
        int keyBits;
        if (dekAlgName.startsWith("AES-128-")) {
            keyBits = 128;
        } else if (dekAlgName.startsWith("AES-192-")) {
            keyBits = 192;
        } else if (dekAlgName.startsWith("AES-256-")) {
            keyBits = 256;
        } else {
            throw new EncryptionException("unknown AES encryption with private key: " + dekAlgName);
        }
        sKey = getKey(password, keyBits / 8, salt);
        engine = new AESEngine();
    } else {
        throw new EncryptionException("unknown encryption with private key: " + dekAlgName);
    }
    if (blockMode.equals("CBC")) {
        engine = new CBCBlockCipher(engine);
    } else if (blockMode.equals("CFB")) {
        engine = new CFBBlockCipher(engine, engine.getBlockSize() * 8);
    } else if (blockMode.equals("OFB")) {
        engine = new OFBBlockCipher(engine, engine.getBlockSize() * 8);
    }
    try {
        BufferedBlockCipher c;
        if (padding == null) {
            c = new BufferedBlockCipher(engine);
        } else {
            c = new PaddedBufferedBlockCipher(engine, padding);
        }
        if (// ECB block mode
        ivValue == null) {
            c.init(encrypt, sKey);
        } else {
            c.init(encrypt, new ParametersWithIV(sKey, ivValue));
        }
        byte[] out = new byte[c.getOutputSize(bytes.length)];
        int procLen = c.processBytes(bytes, 0, bytes.length, out, 0);
        procLen += c.doFinal(out, procLen);
        if (procLen == out.length) {
            return out;
        } else {
            byte[] rv = new byte[procLen];
            System.arraycopy(out, 0, rv, 0, procLen);
            return rv;
        }
    } catch (Exception e) {
        throw new EncryptionException("exception using cipher - please check password and data.", e);
    }
}

Example 5 with RC2Parameters

use of com.github.zhenwei.core.crypto.params.RC2Parameters in project LinLong-Java by zhenwei1108.

the class BrokenJCEBlockCipher method engineInit.

protected void engineInit(int opmode, Key key, AlgorithmParameterSpec params, SecureRandom random) throws InvalidKeyException, InvalidAlgorithmParameterException {
    CipherParameters param;
    // 
    if (key instanceof BCPBEKey) {
        param = Util.makePBEParameters((BCPBEKey) key, params, pbeType, pbeHash, cipher.getUnderlyingCipher().getAlgorithmName(), pbeKeySize, pbeIvSize);
        if (pbeIvSize != 0) {
            ivParam = (ParametersWithIV) param;
        }
    } else if (params == null) {
        param = new KeyParameter(key.getEncoded());
    } else if (params instanceof IvParameterSpec) {
        if (ivLength != 0) {
            param = new ParametersWithIV(new KeyParameter(key.getEncoded()), ((IvParameterSpec) params).getIV());
            ivParam = (ParametersWithIV) param;
        } else {
            param = new KeyParameter(key.getEncoded());
        }
    } else if (params instanceof RC2ParameterSpec) {
        RC2ParameterSpec rc2Param = (RC2ParameterSpec) params;
        param = new RC2Parameters(key.getEncoded(), ((RC2ParameterSpec) params).getEffectiveKeyBits());
        if (rc2Param.getIV() != null && ivLength != 0) {
            param = new ParametersWithIV(param, rc2Param.getIV());
            ivParam = (ParametersWithIV) param;
        }
    } else if (params instanceof RC5ParameterSpec) {
        RC5ParameterSpec rc5Param = (RC5ParameterSpec) params;
        param = new RC5Parameters(key.getEncoded(), ((RC5ParameterSpec) params).getRounds());
        if (rc5Param.getWordSize() != 32) {
            throw new IllegalArgumentException("can only accept RC5 word size 32 (at the moment...)");
        }
        if ((rc5Param.getIV() != null) && (ivLength != 0)) {
            param = new ParametersWithIV(param, rc5Param.getIV());
            ivParam = (ParametersWithIV) param;
        }
    } else {
        throw new InvalidAlgorithmParameterException("unknown parameter type.");
    }
    if ((ivLength != 0) && !(param instanceof ParametersWithIV)) {
        if (random == null) {
            random = CryptoServicesRegistrar.getSecureRandom();
        }
        if ((opmode == Cipher.ENCRYPT_MODE) || (opmode == Cipher.WRAP_MODE)) {
            byte[] iv = new byte[ivLength];
            random.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!");
    }
}