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:encrypt.algorithms.AESCBC.java

public String encrypt(String key1, String key2, String value) {
    try {// ww  w  .ja va  2  s.  c om
        IvParameterSpec iv = new IvParameterSpec(key2.getBytes("UTF-8"));

        SecretKeySpec skeySpec = new SecretKeySpec(key1.getBytes("UTF-8"), "AES");
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
        byte[] encrypted = cipher.doFinal(value.getBytes());
        // System.out.println("encrypted string:"
        //       + Base64.encodeBase64String(encrypted));
        return Base64.encodeBase64String(encrypted);
    } catch (Exception ex) {
        ex.printStackTrace();
    }
    return null;
}

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From source file:Main.java

public static void encrypt(String fileIn, String fileOut, byte key[])
        throws IOException, NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException {
    // Here you read the cleartext.
    FileInputStream fis = new FileInputStream(fileIn);
    // This stream write the encrypted text. This stream will be wrapped by another stream.
    FileOutputStream fos = new FileOutputStream(fileOut);

    // Length is 32 bytes
    //byte key[] = "1010110101010101010100101111001001001001001001011110111100000011010110101010101010100101111001001001001001001011110111100000011010110101010101010100101111001001001001001001011110111100000011010110101010101010100101111001001001001001001011110111100000011010110101010101010100101111001001001001001001011110111100000011010110101010101010100101111001001001001001001011110111100000011010110101010101010100101111001001001001001001011110111100000011010110101010101010100101111001001001001001001011110111100001111000011".getBytes("UTF-8");
    MessageDigest sha = MessageDigest.getInstance("SHA-256");
    key = sha.digest(key);// w w  w .j  ava 2 s  . c  om
    SecretKeySpec sks = new SecretKeySpec(key, "AES");
    // Create cipher
    Cipher cipher = Cipher.getInstance("AES");
    cipher.init(Cipher.ENCRYPT_MODE, sks);
    // Wrap the output stream
    CipherOutputStream cos = new CipherOutputStream(fos, cipher);
    // Write bytes
    int b;
    byte[] d = new byte[8];
    while ((b = fis.read(d)) != -1) {
        cos.write(d, 0, b);
    }
    // Flush and close streams.
    cos.flush();
    cos.close();
    fis.close();
}

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From source file:com.philosophy.LicenseGen.java

public LicenseGen(String text) {
    license = text;//from   w  ww .ja v  a 2s  . com
    byte[] keyBytes = { 88, 42, 94, 52, 56, 81, 82, 98 };
    System.out.println("Original License : " + license);
    try {
        SecretKey key = new SecretKeySpec(keyBytes, "DES");
        Cipher cipher = Cipher.getInstance("DES");
        byte[] data = license.getBytes();
        cipher.init(Cipher.ENCRYPT_MODE, key);
        byte[] encrypted = cipher.doFinal(data);
        System.out.println("Encrypted license : " + new String(encrypted));
        //now convert to base64
        byte[] base64Enc = Base64.encodeBase64(encrypted);
        String encodedLicense = new String(base64Enc);
        System.out.println("Encoded license is : " + encodedLicense);
        System.out.println("Encoding string length is : " + encodedLicense.length());
    } catch (NoSuchAlgorithmException e) {
    } catch (NoSuchPaddingException e) {
    } catch (InvalidKeyException e) {
    } catch (IllegalStateException e) {
    } catch (IllegalBlockSizeException e) {
    } catch (BadPaddingException e) {
    }
}

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From source file:com.philosophy.LicenseDecoder.java

public LicenseDecoder(String text) {
    license = text;/* ww w  .  j a v a2  s  .co  m*/
    byte[] keyBytes = { 88, 42, 94, 52, 56, 81, 82, 98 };
    System.out.println("Original License : " + license);
    try {
        SecretKey key = new SecretKeySpec(keyBytes, "DES");
        Cipher cipher = Cipher.getInstance("DES");
        byte[] decoded = Base64.decodeBase64(license.getBytes());
        cipher.init(Cipher.DECRYPT_MODE, key);
        byte[] decrypted = cipher.doFinal(decoded);
        System.out.println("Decrypted license : " + new String(decrypted));
    } catch (NoSuchAlgorithmException e) {
    } catch (NoSuchPaddingException e) {
    } catch (InvalidKeyException e) {
    } catch (IllegalStateException e) {
    } catch (IllegalBlockSizeException e) {
    } catch (BadPaddingException e) {
    }
}

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From source file:com.agiletec.aps.util.DefaultApsEncrypter.java

public static String encryptString(String plainText) throws ApsSystemException {
    String encryptedString = null;
    try {/*from w  w  w .  j  a va2  s .  c o  m*/
        Key key = getKey();
        Cipher desCipher = Cipher.getInstance(TRIPLE_DES);
        desCipher.init(Cipher.ENCRYPT_MODE, key);
        byte[] cleartext = plainText.getBytes();
        byte[] ciphertext = desCipher.doFinal(cleartext);
        encryptedString = new String(Base64.encodeBase64(ciphertext));
    } catch (Throwable t) {
        throw new ApsSystemException("Error detcted while encoding a string", t);
    }
    return encryptedString;
}

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From source file:com.doculibre.constellio.utils.aes.SimpleProtector.java

public static String decrypt(String encryptedValue) throws Exception {
    Key key = generateKey();/*from   www  . j  a v  a  2  s  .  co m*/
    Cipher c = Cipher.getInstance(ALGORITHM);
    c.init(Cipher.DECRYPT_MODE, key);
    byte[] decordedValue = Base64.decodeBase64(encryptedValue);
    byte[] decValue = c.doFinal(decordedValue);
    String decryptedValue = new String(decValue);
    return decryptedValue;
}

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From source file:info.fcrp.keepitsafe.util.Crypt.java

private static void init() {
    if (cryptCipher == null || decryptCipher == null) {
        try {//w ww  . j a v a 2s  .  c om
            SecretKeySpec keySpec = new SecretKeySpec(password.getBytes(), "AES");
            cryptCipher = Cipher.getInstance("AES");
            cryptCipher.init(Cipher.ENCRYPT_MODE, keySpec);

            decryptCipher = Cipher.getInstance("AES");
            decryptCipher.init(Cipher.DECRYPT_MODE, keySpec);

        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException(e);
        } catch (NoSuchPaddingException e) {
            throw new RuntimeException(e);
        }
        // output = cipher.doFinal(input)
        //
        // Cipher c = Cipher.getInstance("AES");
        // String plain = "plain";
        // byte[] plainBytes = plain.getBytes();
        //
        // c.init(Cipher.ENCRYPT_MODE, k);
        // c.update(plainBytes);
        //
        // byte[] encBytes = c.doFinal();
        // String enc = Base64.encodeBase64String(encBytes);
        // assertNotSame(plain, enc);
        //
        // c.init(Cipher.DECRYPT_MODE, k);
        // c.update(encBytes);
        // byte[] decBytes = c.doFinal();
        // String dec = new String(decBytes);
        catch (InvalidKeyException e) {
            throw new RuntimeException(e);
        }
    }
}

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From source file:cr.ac.uia.SistemaGC.utils.AES.java

public static String encrypt(Long cedula, String usuario, String contrasena) {
    //<editor-fold defaultstate="collapsed" desc="Mtodo para cifrar contraseas">
    /*/*  ww w  . jav a2s .c om*/
    * Inspirado en:
    * http://stackoverflow.com/questions/15554296/simple-java-aes-encrypt-decrypt-example
     */
    try {
        IvParameterSpec iv = new IvParameterSpec(fitString(usuario, 16).getBytes("UTF-8"));
        SecretKeySpec skeySpec = new SecretKeySpec(fitString(cedula.toString(), 16).getBytes("UTF-8"), "AES");
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
        byte[] encrypted = cipher.doFinal(contrasena.getBytes());
        return Base64.encodeBase64String(encrypted);
    } catch (UnsupportedEncodingException | NoSuchAlgorithmException | NoSuchPaddingException
            | InvalidKeyException | InvalidAlgorithmParameterException | IllegalBlockSizeException
            | BadPaddingException e) {
        e.printStackTrace();
        System.err.println(e.getClass().getName() + ": " + e.getMessage());
        System.exit(0);
    }
    return null;
    //</editor-fold>
}

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From source file:com.lecaddyfute.utils.security.AESCrypto.java

public static String decrypt1(String encryptedData) throws Exception {
    KeyGenerator keyGen = KeyGenerator.getInstance(ALGO);
    keyGen.init(128);/*www  . ja va  2s  .  c om*/
    SecretKey key = keyGen.generateKey();
    Cipher c = Cipher.getInstance(ALGO);

    c.init(Cipher.DECRYPT_MODE, key);
    //        byte[] decordedValue = Base64.decodeBase64(encryptedData.getBytes());
    //        byte[] decValue = c.doFinal(decordedValue);
    byte[] decValue = c.doFinal(encryptedData.getBytes("UTF8"));
    String decryptedValue = new String(decValue);
    return decryptedValue;
}

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

private static Cipher getEncryptCipher(HttpServletRequest request, String key) throws Exception {
    Cipher encryptCipher = (Cipher) request.getAttribute(REQUEST_CSRF_ENCRYPT_CIPHER);
    if (encryptCipher == null) {
        encryptCipher = Cipher.getInstance("AES");
        SecretKey secretKey = new SecretKeySpec(key.getBytes("UTF8"), "AES");
        encryptCipher.init(Cipher.ENCRYPT_MODE, secretKey);
        request.setAttribute(REQUEST_CSRF_ENCRYPT_CIPHER, encryptCipher);
    }//from w w w . ja va 2 s.com
    return encryptCipher;
}

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