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: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);
    return cipher.doFinal(clear);
}

From source file:licenceexecuter.Encryptor.java

public static String encrypt(String key, String initVector, String value) {
    try {/*from   w w w . j  ava2 s. c o m*/
        IvParameterSpec iv = new IvParameterSpec(initVector.getBytes("UTF-8"));
        SecretKeySpec skeySpec = new SecretKeySpec(key.getBytes("UTF-8"), "AES");

        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);

        byte[] encrypted = cipher.doFinal(value.getBytes());
        return Base64.encodeBase64String(encrypted);
    } catch (Exception ex) {
        ex.printStackTrace();
    }

    return null;
}

From source file:Logic.security.java

public static String symmetricEncrypt(String text, String secretKey) {
    byte[] raw;//from  w ww.j  av a 2s . com
    String encryptedString;
    SecretKeySpec skeySpec;
    byte[] encryptText = text.getBytes();
    Cipher cipher;
    try {
        raw = Base64.decodeBase64(secretKey);
        skeySpec = new SecretKeySpec(raw, "AES");
        cipher = Cipher.getInstance("AES");
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
        encryptedString = Base64.encodeBase64String(cipher.doFinal(encryptText));
    } catch (Exception e) {
        e.printStackTrace();
        return "Error";
    }
    return encryptedString;
}

From source file:Main.java

public static String enCrypto(String txt, String key) {

    if (txt != null && !"".equals(txt) && !"null".equals(txt)) {

        try {//  w ww.ja v a  2 s  .co m

            StringBuffer sb = new StringBuffer();
            DESKeySpec desKeySpec = new DESKeySpec(key.getBytes());
            SecretKeyFactory skeyFactory = null;
            Cipher cipher = null;
            try {
                skeyFactory = SecretKeyFactory.getInstance("DES");
                cipher = Cipher.getInstance("DES");
            } catch (NoSuchAlgorithmException e) {
                e.printStackTrace();
            }
            SecretKey deskey = skeyFactory.generateSecret(desKeySpec);
            cipher.init(Cipher.ENCRYPT_MODE, deskey);
            byte[] cipherText = cipher.doFinal(txt.getBytes());
            for (int n = 0; n < cipherText.length; n++) {
                String stmp = (java.lang.Integer.toHexString(cipherText[n] & 0XFF));
                if (stmp.length() == 1) {
                    sb.append("0" + stmp);
                } else {
                    sb.append(stmp);
                }
            }
            return sb.toString().toUpperCase(Locale.US);

        } catch (Exception e) {

            e.printStackTrace();
        }
    }
    return null;
}

From source file:Main.java

/**
 * Decrypt data/*w w  w  . j  a  v  a2s.  com*/
 * @param secretKey -   a secret key used for decryption
 * @param data      -   data to decrypt
 * @return   Decrypted data
 * @throws Exception
 */
public static String decipher(String secretKey, String data) throws Exception {
    // Key has to be of length 8
    if (secretKey == null || secretKey.length() != 8)
        throw new Exception("Invalid key length - 8 bytes key needed!");

    SecretKey key = new SecretKeySpec(secretKey.getBytes(), ALGORITHM);
    Cipher cipher = Cipher.getInstance(ALGORITHM);
    cipher.init(Cipher.DECRYPT_MODE, key);

    return new String(cipher.doFinal(toByte(data)));
}

From source file:Main.java

private static byte[] Des(byte[] byteData, byte[] byteKey, int opmode)
        throws InvalidKeyException, NoSuchAlgorithmException, InvalidKeySpecException, NoSuchPaddingException,
        IllegalBlockSizeException, BadPaddingException {
    Cipher cipher = null;//  w w  w. jav  a  2  s  .com
    try {
        SecretKeySpec desKey = new SecretKeySpec(byteKey, "DES");

        cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
        cipher.init(opmode, desKey);

        return cipher.doFinal(byteData);
    } finally {
        cipher = null;
    }
}

From source file:Main.java

public static byte[] encrypt(String clearText) {
    SecretKeySpec keySpec = new SecretKeySpec(keyBytes, "AES");
    Cipher cipher = null;/*from  www.ja  va 2s  . com*/
    byte[] cipherText = null;

    try {
        // init cipher
        cipher = Cipher.getInstance("AES");
        cipher.init(Cipher.ENCRYPT_MODE, keySpec);
        cipherText = cipher.doFinal(clearText.getBytes());
    } catch (IllegalBlockSizeException e) {
        e.printStackTrace();
    } catch (BadPaddingException e) {
        e.printStackTrace();
    } catch (InvalidKeyException e) {
        e.printStackTrace();
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
    } catch (NoSuchPaddingException e) {
        e.printStackTrace();
    }
    return Base64.encode(cipherText, 10);
}

From source file:Main.java

public static String decrypt(byte[] cipherText) {
    SecretKeySpec keySpec = new SecretKeySpec(keyBytes, "AES");

    Cipher cipher = null;//from   w  ww .  j  a va  2 s  . c o  m
    byte[] clearText = null;

    try {
        // init cipher
        cipher = Cipher.getInstance("AES");
        cipher.init(Cipher.DECRYPT_MODE, keySpec);
        clearText = cipher.doFinal(Base64.decode(new String(cipherText), 10));
    } catch (IllegalBlockSizeException e) {
        e.printStackTrace();
    } catch (BadPaddingException e) {
        e.printStackTrace();
    } catch (NoSuchPaddingException e) {
        e.printStackTrace();
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
    } catch (InvalidKeyException e) {// TODO Auto-generated catch block
        e.printStackTrace();
    }

    return new String(clearText);
}

From source file:Main.java

public static String encryption(String string) throws Exception {
    // TODO Auto-generated method stub

    //generate symmetric key
    KeyGenerator keygt = KeyGenerator.getInstance("AES");
    keygt.init(128);//  w ww  . ja  v a  2 s  .  c  om
    SecretKey symkey = keygt.generateKey();

    //get it encoded
    byte[] aes_ba = symkey.getEncoded();

    //create cipher
    SecretKeySpec skeySpec = new SecretKeySpec(aes_ba, "AES");
    Cipher cipher = Cipher.getInstance("AES");
    cipher.init(Cipher.ENCRYPT_MODE, skeySpec);

    //encryption
    byte[] EncSymbyteArray = cipher.doFinal(string.getBytes());

    //encrypt symKey with PublicKey
    //        Key pubKey = getPublicKey();

    Key pubKey = publicKey;

    //RSA cipher
    Cipher cipherAsm = Cipher.getInstance("RSA", "BC");
    cipherAsm.init(Cipher.ENCRYPT_MODE, pubKey);

    //RSA encryption
    byte[] asymEncsymKey = cipherAsm.doFinal(aes_ba);

    //           File f3 = new File(BASE_PATH,"enc.txt");
    //           File f3key = new File(BASE_PATH,"enckey.txt");
    //           File f3file = new File(BASE_PATH,"encfile.txt");
    //           writeToFile2(f3,f3key,f3file, asymEncsymKey, EncSymbyteArray);

    //byte != new String
    //return new String(byteMerger(asymEncsymKey, EncSymbyteArray));
    return Base64.encodeToString(byteMerger(asymEncsymKey, EncSymbyteArray), Base64.DEFAULT);

}

From source file:Main.java

/**
 * Encrypt data//  w  w  w.  j av  a2  s. c  o  m
 * @param secretKey   -   a secret key used for encryption
 * @param data      -   data to encrypt
 * @return   Encrypted data
 * @throws Exception
 */
public static String cipher(String secretKey, String data) throws Exception {
    // Key has to be of length 8
    if (secretKey == null || secretKey.length() != 8)
        throw new Exception("Invalid key length - 8 bytes key needed!");

    SecretKey key = new SecretKeySpec(secretKey.getBytes(), ALGORITHM);
    Cipher cipher = Cipher.getInstance(ALGORITHM);
    cipher.init(Cipher.ENCRYPT_MODE, key);

    return toHex(cipher.doFinal(data.getBytes()));
}