Example usage for javax.crypto Cipher getInstance

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:Authentication.HashPassword.java

public HashPassword() throws Exception {
    myEncryptionKey = "ThisIsSpartaThisIsSparta";
    myEncryptionScheme = DESEDE_ENCRYPTION_SCHEME;
    arrayBytes = myEncryptionKey.getBytes(UNICODE_FORMAT);
    ks = new DESedeKeySpec(arrayBytes);
    skf = SecretKeyFactory.getInstance(myEncryptionScheme);
    cipher = Cipher.getInstance(myEncryptionScheme);
    key = skf.generateSecret(ks);/* ww  w . j  a  v  a 2  s  .com*/
}

From source file:Main.java

/**
 * This method should be used to encrypt a block of data.
 * //  w w  w.  j a  va  2  s . c om
 * @param fileData
 *            the data to encrypt.
 * @param encryptionKey
 *            the key to initialize the cipher-algorithm.
 * @param encryptCompleted
 *            a flag, that indicates, that a multi-part encryption is to be
 *            completed. e.g. false, if the fileData consist of multiple
 *            parts. true, if the fileData consists only of one single part
 *            and so they could be encrypted in one operation.
 * 
 * @return the encrypted data.
 */
public static byte[] encryptData(byte[] fileData, byte[] encryptionKey, boolean encryptCompleted) {

    // Initializing may only be done at the start of a multi-part crypto-operation.
    // if it's a single part crypto-operation initialization must always be done.
    if (!encryptInitialized) {
        // Initializing the cipher
        try {
            encryptCipher = Cipher.getInstance("AES");
        } catch (Exception e) {
            Log.e(TAG, "Error while initializing encryption.");
            return null;
        }

        try {
            SecretKeySpec keySpec = new SecretKeySpec(encryptionKey, "AES");
            encryptCipher.init(Cipher.ENCRYPT_MODE, keySpec);
        } catch (Exception e) {
            Log.e(TAG, "Error while initializing encryption.");
            return null;
        }
        encryptInitialized = true;
    }

    // encrypting
    try {
        if (!encryptCompleted)
            // done in case of multi-part operation
            fileData = encryptCipher.update(fileData);
        else
            // done in case of single part operation or to finish a multi-part operation
            fileData = encryptCipher.doFinal(fileData);
    } catch (Exception e) {
        Log.e(TAG, "Error during encryption.");
        return null;
    }

    // at the and of an multi-part operation flags must be reset
    if (encryptCompleted)
        encryptInitialized = false;
    return fileData;
}

From source file:com.feedzai.commons.sql.abstraction.util.AESHelper.java

/**
 * Encrypts a byte[]./*from   ww w  .  j  av a  2s  .c o m*/
 *
 * @param c   The byte[] to encrypt.
 * @param key The key.
 * @return The encrypted array as a HEX string.
 */
public static String encrypt(byte[] c, String key) {
    try {
        SecretKeySpec skeySpec = new SecretKeySpec(Hex.decodeHex(key.toCharArray()), "AES");
        Cipher cipher = Cipher.getInstance("AES");
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
        byte[] encoded = cipher.doFinal(c);
        return new String(Hex.encodeHex(encoded));

    } catch (Exception e) {
        logger.warn("Could not encrypt byte[]", e);
        return null;
    }
}

From source file:com.amazonaws.cognito.sync.devauth.client.AESEncryption.java

/**
 * Decrypt a cipher in bytes using the specified key
 * /*w  ww  .  j  av a 2  s .c  o m*/
 * @param cipherBytes encrypted bytes
 * @param key the key used in decryption
 * @param iv
 * @return
 * @throws Exception
 */
public static byte[] decrypt(byte[] cipherBytes, String key, byte[] iv) throws Exception {
    Cipher cipher = Cipher.getInstance(ENCRYPTION_ALGORITHM);
    AlgorithmParameters params = AlgorithmParameters.getInstance("AES");
    params.init(new IvParameterSpec(iv));
    cipher.init(Cipher.DECRYPT_MODE, getKey(key), params);
    return cipher.doFinal(cipherBytes);
}

From source file:com.intera.roostrap.util.EncryptionUtil.java

private static void encryptOrDecrypt(String encryptionKey, int mode, InputStream is, OutputStream os)
        throws InvalidKeyException, IOException {
    DESKeySpec keySpec = new DESKeySpec(toBytes(encryptionKey));

    SecretKey key = null;/*from  w ww.j  av a  2  s.  c om*/
    Cipher cipher = null;
    try {
        SecretKeyFactory secretKeyFactory = SecretKeyFactory.getInstance("DES");
        key = secretKeyFactory.generateSecret(keySpec);
        cipher = Cipher.getInstance("DES");

    } catch (Exception e) {
        throw new RuntimeException(e);
    }

    if (mode == Cipher.ENCRYPT_MODE) {
        cipher.init(Cipher.ENCRYPT_MODE, key);
        CipherInputStream cis = new CipherInputStream(is, cipher);
        doCopy(cis, os);
    } else if (mode == Cipher.DECRYPT_MODE) {
        cipher.init(Cipher.DECRYPT_MODE, key);
        CipherOutputStream cos = new CipherOutputStream(os, cipher);
        doCopy(is, cos);
    }
}

From source file:com.ikon.util.SecureStore.java

/**
 * DES encoder/*from   w  ww.  ja  va  2s .  c  om*/
 */
public static byte[] desEncode(String key, byte[] src)
        throws InvalidKeyException, UnsupportedEncodingException, NoSuchAlgorithmException,
        InvalidKeySpecException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException {
    DESKeySpec keySpec = new DESKeySpec(key.getBytes("UTF8"));
    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
    SecretKey sKey = keyFactory.generateSecret(keySpec);

    Cipher cipher = Cipher.getInstance("DES"); // cipher is not thread safe
    cipher.init(Cipher.ENCRYPT_MODE, sKey);
    byte[] dst = cipher.doFinal(src);

    return dst;
}

From source file:algorithm.AesEncryption.java

public AesEncryption(String function) {
    setKey(function);//from  w w w.j a va 2s . com
    try {
        encrypt = Cipher.getInstance("AES/ECB/PKCS5Padding");
        decrypt = Cipher.getInstance("AES/ECB/PKCS5Padding");
    } catch (NoSuchAlgorithmException | NoSuchPaddingException ex) {
        Logger.getLogger(AesEncryption.class.getName()).log(Level.SEVERE, null, ex);
    }
}

From source file:com.jsmartframework.web.manager.CsrfEncrypter.java

private static Cipher getDecryptCipher(HttpServletRequest request, String key) throws Exception {
    Cipher decryptCipher = (Cipher) request.getAttribute(REQUEST_CSRF_DECRYPT_CIPHER);
    if (decryptCipher == null) {
        decryptCipher = Cipher.getInstance("AES");
        SecretKey secretKey = new SecretKeySpec(key.getBytes("UTF8"), "AES");
        decryptCipher.init(Cipher.DECRYPT_MODE, secretKey);
        request.setAttribute(REQUEST_CSRF_DECRYPT_CIPHER, decryptCipher);
    }/*from w ww .  j  a  v  a 2 s  .  c  o  m*/
    return decryptCipher;
}

From source file:gov.nih.nci.cadsr.cadsrpasswordchange.core.OracleObfuscation.java

public OracleObfuscation(String secretString) throws GeneralSecurityException {
    key = new SecretKeySpec(secretString.getBytes(), algorithm1);
    cipher = Cipher.getInstance(algorithm2);
}

From source file:com.jsmartframework.web.manager.AuthEncrypter.java

private static Cipher getDecryptCipher(HttpServletRequest request, String key) throws Exception {
    Cipher decryptCipher = (Cipher) request.getAttribute(REQUEST_AUTH_DECRYPT_CIPHER);
    if (decryptCipher == null) {
        decryptCipher = Cipher.getInstance("AES");
        SecretKey secretKey = new SecretKeySpec(key.getBytes("UTF8"), "AES");
        decryptCipher.init(Cipher.DECRYPT_MODE, secretKey);
        request.setAttribute(REQUEST_AUTH_DECRYPT_CIPHER, decryptCipher);
    }// www .j a  v a 2s  . c  om
    return decryptCipher;
}