Example usage for javax.crypto Cipher getInstance

List of usage examples for javax.crypto Cipher getInstance

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Introduction

In this page you can find the example usage for javax.crypto Cipher getInstance.

Prototype

public static final Cipher getInstance(String transformation)
        throws NoSuchAlgorithmException, NoSuchPaddingException

Source Link

Document

Returns a Cipher object that implements the specified transformation.

Usage

From source file:MainClass.java

private static byte[] passwordEncrypt(char[] password, byte[] plaintext) throws Exception {
    int MD5_ITERATIONS = 1000;
    byte[] salt = new byte[8];
    SecureRandom random = new SecureRandom();
    random.nextBytes(salt);/* w  ww.  ja v a 2  s .  c o  m*/

    PBEKeySpec keySpec = new PBEKeySpec(password);
    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("PBEWithSHAAndTwofish-CBC");
    SecretKey key = keyFactory.generateSecret(keySpec);
    PBEParameterSpec paramSpec = new PBEParameterSpec(salt, MD5_ITERATIONS);
    Cipher cipher = Cipher.getInstance("PBEWithSHAAndTwofish-CBC");
    cipher.init(Cipher.ENCRYPT_MODE, key, paramSpec);

    byte[] ciphertext = cipher.doFinal(plaintext);

    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    baos.write(salt);
    baos.write(ciphertext);
    return baos.toByteArray();
}

From source file:illab.nabal.util.SecurityHelper.java

/**
  * AES-encrypt a plain message. Return null if message is empty.
  * //from  w ww  .j  a  va2s . c o m
  * @param message
  * @return AES encrypted hex
  * @throws Exception
  */
public static String cipher(String message) throws Exception {
    if (StringHelper.isEmpty(message) == false) {
        Cipher cipher = Cipher.getInstance(AES);
        cipher.init(Cipher.ENCRYPT_MODE, SYSTEM_SECRET_KEY_SPEC);
        return Base64.encodeToString(cipher.doFinal(message.getBytes()), Base64.DEFAULT);
    } else {
        return null;
    }
}

From source file:adminpassword.Decryption.java

@SuppressWarnings("static-access")
public String decrypt(String encryptedText, String idKey) throws Exception {
    String password = idKey;//  w  w w .j  av a 2  s  .  c om

    Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");

    //strip off the salt and iv
    ByteBuffer buffer = ByteBuffer.wrap(new Base64().decode(encryptedText));
    byte[] saltBytes = new byte[20];
    buffer.get(saltBytes, 0, saltBytes.length);
    byte[] ivBytes1 = new byte[cipher.getBlockSize()];
    buffer.get(ivBytes1, 0, ivBytes1.length);
    byte[] encryptedTextBytes = new byte[buffer.capacity() - saltBytes.length - ivBytes1.length];
    buffer.get(encryptedTextBytes);

    // Deriving the key
    SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
    PBEKeySpec spec = new PBEKeySpec(password.toCharArray(), saltBytes, 65556, 256);

    SecretKey secretKey = factory.generateSecret(spec);
    SecretKeySpec secret = new SecretKeySpec(secretKey.getEncoded(), "AES");
    cipher.init(Cipher.DECRYPT_MODE, secret, new IvParameterSpec(ivBytes1));

    byte[] decryptedTextBytes = null;
    try {
        decryptedTextBytes = cipher.doFinal(encryptedTextBytes);

    } catch (IllegalBlockSizeException e) {
        e.printStackTrace();
    } catch (BadPaddingException e) {
        e.printStackTrace();
    }

    return new String(decryptedTextBytes);
}

From source file:Main.java

private static byte[] encrypt(byte[] raw, byte[] clear) throws Exception {
    SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
    Cipher cipher = Cipher.getInstance("AES");
    cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
    byte[] encrypted = cipher.doFinal(clear);
    return encrypted;
}

From source file:com.ro.ssc.app.client.licensing.TrialKeyValidator.java

public static String decodeKey(String encodedEncrypted) {
    String decoded = "";
    try {/*from w ww. j a v  a  2  s.  c o m*/
        byte[] saltDecrypt = SALT_DECRYPT.getBytes(StandardCharsets.UTF_8);
        SecretKeyFactory factoryKeyDecrypt = SecretKeyFactory.getInstance(SECRET_KEY_FACTORY);
        SecretKey tmp2 = factoryKeyDecrypt.generateSecret(
                new PBEKeySpec(PASS_DECRYPT.toCharArray(), saltDecrypt, ITERATIONS_DECRYPT, KEY_LENGTH));
        SecretKeySpec decryptKey = new SecretKeySpec(tmp2.getEncoded(), ALGORITHM);
        Cipher aesCipherDecrypt = Cipher.getInstance(CIPHER);
        aesCipherDecrypt.init(Cipher.DECRYPT_MODE, decryptKey);
        byte[] e64bytes = StringUtils.getBytesUtf8(encodedEncrypted);
        byte[] eBytes = Base64.decodeBase64(e64bytes);
        byte[] cipherDecode = aesCipherDecrypt.doFinal(eBytes);
        decoded = StringUtils.newStringUtf8(cipherDecode);
    } catch (Exception e) {
        LOGGER.error("Error while decoding the trial key", e);
    }
    return decoded;
}

From source file:com.imaginary.home.cloud.Configuration.java

static public @Nonnull String decrypt(@Nonnull String keySalt, @Nonnull String value) {
    try {//from ww w  .ja v  a 2s.  c  o m
        SecretKeySpec spec = new SecretKeySpec(getConfiguration().getCustomSalt(keySalt), "AES");
        Cipher cipher = Cipher.getInstance("AES");

        cipher.init(Cipher.DECRYPT_MODE, spec);

        byte[] b64 = value.getBytes("utf-8");
        byte[] raw = Base64.decodeBase64(b64);
        byte[] decrypted = cipher.doFinal(raw);
        return new String(decrypted, "utf-8");
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
}

From source file:ch.helmchen.camlapse.user.control.Encryption.java

/**
 * Verschlsselt den bergebenen String./*  w w w.j a  v  a  2  s  . c  o  m*/
 * 
 * @param aString zu verschlsselnder String.
 */
public static String encrypt(final String aString) throws GeneralSecurityException {
    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("PBEWithMD5AndDES");
    SecretKey key = keyFactory.generateSecret(new PBEKeySpec(PASSWORD));
    Cipher pbeCipher = Cipher.getInstance("PBEWithMD5AndDES");
    pbeCipher.init(Cipher.ENCRYPT_MODE, key, new PBEParameterSpec(SALT, 20));
    return base64Encode(pbeCipher.doFinal(aString.getBytes()));
}

From source file:com.liferay.sync.engine.util.Encryptor.java

public static String encrypt(String value) throws Exception {
    if (value == null) {
        return "";
    }//ww w.j av a  2 s .c  om

    SecretKey secretKey = new SecretKeySpec(_PASSWORD, _ALGORITHM);

    Cipher cipher = Cipher.getInstance(_ALGORITHM);

    cipher.init(Cipher.ENCRYPT_MODE, secretKey);

    String salt = getSalt();

    String encryptedValue = value;

    for (int i = 0; i < _ITERATIONS; i++) {
        encryptedValue = salt.concat(encryptedValue);

        byte[] encryptedBytes = cipher.doFinal(encryptedValue.getBytes(_UTF8_CHARSET));

        encryptedValue = Base64.encodeBase64String(encryptedBytes);
    }

    return encryptedValue;
}

From source file:love.sola.netsupport.util.RSAUtil.java

public static String encrypt(String value) {
    try {//from  w w w .j a v  a2  s.co m
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.ENCRYPT_MODE, publicKey);
        byte[] encrypted = cipher.doFinal(value.getBytes(StandardCharsets.UTF_8));
        return Base64.encodeBase64String(encrypted);
    } catch (Exception ex) {
        ex.printStackTrace();
    }
    return null;
}

From source file:com.zf.decipher.DataEn.java

private static byte[] encrypt(byte[] data) throws Exception {
    if (null == secretKey) {
        throw new SecurityException("secretKey is null");
    }// w  w w . ja  v  a2  s  .c om
    Cipher cipher = Cipher.getInstance(secretKey.getAlgorithm());
    cipher.init(Cipher.ENCRYPT_MODE, secretKey);
    return cipher.doFinal(data);
}