Example usage for javax.crypto Cipher doFinal

List of usage examples for javax.crypto Cipher doFinal

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Introduction

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

Prototype

public final byte[] doFinal(byte[] input) throws IllegalBlockSizeException, BadPaddingException

Source Link

Document

Encrypts or decrypts data in a single-part operation, or finishes a multiple-part operation.

Usage

From source file:Main.java

public static String decryptData(String ciphertext, String password) throws Exception {
    int iterationCount = 100; //because polaroid
    int keyLength = 256;

    String[] fields = ciphertext.split("]");
    byte[] iv = Base64.decode(fields[0], 0);
    byte[] salt = Base64.decode(fields[1], 0);
    byte[] cipherBytes = Base64.decode(fields[2], 0);

    Log.d(TAG, "ciphertext: " + ciphertext + "\n" + "iv length is " + "\n" + iv.length);

    KeySpec keySpec = new PBEKeySpec(password.toCharArray(), salt, iterationCount, keyLength);
    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
    byte[] keyBytes = keyFactory.generateSecret(keySpec).getEncoded();
    SecretKey key = new SecretKeySpec(keyBytes, "AES");

    Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
    IvParameterSpec ivParams = new IvParameterSpec(iv);
    cipher.init(Cipher.DECRYPT_MODE, key, ivParams);
    byte[] plaintext = cipher.doFinal(cipherBytes);
    String plainStr = new String(plaintext, "UTF-8");

    return plainStr;
}

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

public static String decrypt(String encryptedData) throws Exception {
    Key key = generateKey();//from   www. j  av  a2s .c o m
    Cipher c = Cipher.getInstance(ALGO);
    c.init(Cipher.DECRYPT_MODE, key);
    byte[] decordedValue = Base64.decodeBase64(encryptedData.getBytes());
    byte[] decValue = c.doFinal(decordedValue);
    String decryptedValue = new String(decValue);
    return decryptedValue;
}

From source file:com.dragoniade.encrypt.EncryptionHelper.java

public static void decrypt(Properties p, String seedKey, String key) {
    String value = p.getProperty(key);
    String seed = p.getProperty(seedKey, seedKey);

    if (value == null || value.length() == 0) {
        return;/* w w w. j a  v a2 s. co m*/
    }

    int index = value.indexOf('{');
    switch (index) {
    case -1:
        return;
    case 0: {
        String toDecode = value.substring(1, value.length() - 1);
        String decryptStr;
        try {
            decryptStr = new String(Base64.decode(toDecode), "UTF-16");
        } catch (UnsupportedEncodingException e1) {
            decryptStr = new String(Base64.decode(toDecode));
        }

        p.setProperty(key, decryptStr);
        return;
    }
    default:
        String toDecode = value.substring(index + 1, value.length() - 1);
        String algorithm = value.substring(0, index);

        byte[] decryptStr = Base64.decode(toDecode);

        Cipher cipher = getDecrypter(seed, algorithm);

        String decoded;
        try {
            byte[] result = cipher.doFinal(decryptStr);
            try {
                decoded = new String(result, "UTF-16");
            } catch (UnsupportedEncodingException e1) {
                decoded = new String(result);
            }
        } catch (Exception e) {
            decoded = "";
        }

        p.setProperty(key, decoded);
    }
}

From source file:com.example.license.DESUtil.java

/**
 * ?//from   w ww. ja va2  s .  c o  m
 * 
 * @param data
 *            ?
 * @param key
 *            
 * @return ??
 */
public static String decryptBase64(String data, String key) throws Exception {
    DESKeySpec desKey = new DESKeySpec(key.getBytes());
    // ?DESKeySpec??
    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(ALGORITHM);
    SecretKey securekey = keyFactory.generateSecret(desKey);

    Cipher cipher = Cipher.getInstance(ALGORITHM);
    cipher.init(Cipher.DECRYPT_MODE, securekey);
    // ?
    return new String(cipher.doFinal(Base64.decodeBase64(data.getBytes())));
}

From source file:it.latraccia.pkcs11.reader.util.AESUtil.java

public static String decryptString(String encryptedText, String password)
        throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidAlgorithmParameterException,
        InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
    String decrypted = null;// w  w  w .  java2 s  . c o  m
    byte[] key = password.getBytes();
    if (key.length != 16) {
        throw new IllegalArgumentException("Invalid key size.");
    }
    byte[] value = Base64.decodeBase64(encryptedText);

    // Decrypt with AES/CBC/PKCS5Padding
    SecretKeySpec skeySpec = new SecretKeySpec(key, "AES");
    Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
    cipher.init(Cipher.DECRYPT_MODE, skeySpec, new IvParameterSpec(new byte[16]));
    byte[] original = cipher.doFinal(value);
    decrypted = new String(original);

    return decrypted;
}

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

/**
  * AES-encrypt a plain message. Return null if message is empty.
  * // w  w w . j av  a 2 s.  co 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:com.iterzp.momo.utils.RSAUtils.java

/**
 * /*from   w  w w. j  a  v  a2s. c  o m*/
 * 
 * @param publicKey
 *            
 * @param data
 *            ?
 * @return ??
 */
public static byte[] encrypt(PublicKey publicKey, byte[] data) {
    Assert.notNull(publicKey);
    Assert.notNull(data);
    try {
        Cipher cipher = Cipher.getInstance("RSA", PROVIDER);
        cipher.init(Cipher.ENCRYPT_MODE, publicKey);
        return cipher.doFinal(data);
    } catch (Exception e) {
        e.printStackTrace();
        return null;
    }
}

From source file:lib.clases_cripto.java

public static String Encriptar(String texto) {

    String secretKey = "qualityinfosolutions"; //llave para encriptar datos
    String base64EncryptedString = "";

    try {// w  w w.j a  va2  s.  c o m

        MessageDigest md = MessageDigest.getInstance("MD5");
        byte[] digestOfPassword = md.digest(texto.getBytes("utf-8"));
        byte[] keyBytes = Arrays.copyOf(digestOfPassword, 24);
        Md5Crypt.md5Crypt(keyBytes);
        SecretKey key = new SecretKeySpec(keyBytes, "DESede");
        Cipher cipher = Cipher.getInstance("DESede");
        cipher.init(Cipher.ENCRYPT_MODE, key);
        byte[] plainTextBytes = texto.getBytes("utf-8");
        byte[] buf = cipher.doFinal(plainTextBytes);
        byte[] base64Bytes = Base64.encodeBase64(buf);

        base64EncryptedString = new String(base64Bytes);

    } catch (Exception ex) {
    }
    return base64EncryptedString;
}

From source file:com.esri.geoevent.datastore.Crypto.java

static public String doDecrypt(String stringToDecrypt) throws GeneralSecurityException {
    Cipher c = Cipher.getInstance(ALGO);
    c.init(Cipher.DECRYPT_MODE, encryptionKey);
    byte[] decodedValue = Base64.decodeBase64(stringToDecrypt.getBytes());
    byte[] decryptedValue = c.doFinal(decodedValue);
    String decryptedString = new String(decryptedValue);
    return decryptedString;
}

From source file:com.sds.acube.ndisc.mts.xserver.util.XNDiscCipher.java

/**
 * /*from   w ww .j a v  a 2  s .c o m*/
 * 
 * @param data ? ?
 * @return ? ?
 */
public static String encode(String data) {
    try {
        Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
        cipher.init(Cipher.ENCRYPT_MODE, key);
        byte e[] = cipher.doFinal(data.getBytes("UTF-8"));
        return replaceChar(Base64.encodeBase64String(e));
    } catch (NoSuchAlgorithmException e) {
        System.err.print(XNDiscUtils.printStackTrace(e));
    } catch (NoSuchPaddingException e) {
        System.err.print(XNDiscUtils.printStackTrace(e));
    } catch (InvalidKeyException e) {
        System.err.print(XNDiscUtils.printStackTrace(e));
    } catch (IllegalBlockSizeException e) {
        System.err.print(XNDiscUtils.printStackTrace(e));
    } catch (BadPaddingException e) {
        System.err.print(XNDiscUtils.printStackTrace(e));
    } catch (UnsupportedEncodingException e) {
        System.err.print(XNDiscUtils.printStackTrace(e));
    }
    return null;
}