Example usage for javax.crypto Cipher doFinal

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 byte[] decrypt(byte[] key, byte[] input) throws Exception {
    Cipher cipher = Cipher.getInstance("AES");
    cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(key, "AES"));
    byte[] decrypted = cipher.doFinal(input);
    return decrypted;
}

From source file:Main.java

public static byte[] decryptData(byte[] encryptedData, PrivateKey privateKey) {
    try {//  w  w w .  j  a  va2s.c  o  m
        Cipher cipher = Cipher.getInstance(RSA_CHPHER_ALGORITHM);
        cipher.init(Cipher.DECRYPT_MODE, privateKey);
        return cipher.doFinal(encryptedData);
    } catch (Exception e) {
        return null;
    }
}

From source file:Main.java

public static byte[] encrypt(byte[] key, byte[] input) throws Exception {
    Cipher cipher = Cipher.getInstance("AES");
    cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(key, "AES"));
    byte[] encrypted = cipher.doFinal(input);
    return encrypted;
}

From source file:Main.java

/**
 * function decrypt the string and return the result
 * @param stringToDecrypt the string against which the decryption to be performed
 * @return the decrypted String//from   w w  w.  j a v a2  s.c om
 */
public static final String decrypt(String stringToDecrypt) {
    try {
        Key aesKey = new SecretKeySpec(key.getBytes(), "AES");
        Cipher cipher = Cipher.getInstance("AES");
        cipher.init(Cipher.DECRYPT_MODE, aesKey);
        return new String(cipher.doFinal(stringToDecrypt.getBytes()));
    } catch (Exception e) {

    }
    return null;
}

From source file:Main.java

/**
 * RSA encryption/*  w  ww  .j  av a  2s .  co m*/
 * @param pubKey
 * @param message
 * @return
 * @throws IllegalBlockSizeException
 * @throws BadPaddingException
 * @throws NoSuchPaddingException
 * @throws NoSuchAlgorithmException
 * @throws InvalidKeyException
 */
public static byte[] encryptRSA(RSAPublicKey pubKey, byte[] message) throws IllegalBlockSizeException,
        BadPaddingException, NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeyException {
    Cipher cipher = Cipher.getInstance("RSA/ECB/NoPadding");
    cipher.init(Cipher.ENCRYPT_MODE, pubKey);

    return cipher.doFinal(message);
}

From source file:Main.java

/**
 * RSA decryption/*from  w  w w  . ja va  2s . c  o  m*/
 * @param priKey
 * @param message
 * @return
 * @throws IllegalBlockSizeException
 * @throws BadPaddingException
 * @throws NoSuchPaddingException
 * @throws NoSuchAlgorithmException
 * @throws InvalidKeyException
 */
public static byte[] decryptRSA(RSAPrivateKey priKey, byte[] message) throws IllegalBlockSizeException,
        BadPaddingException, NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeyException {
    Cipher cipher = Cipher.getInstance("RSA/ECB/NoPadding");
    cipher.init(Cipher.DECRYPT_MODE, priKey);

    return cipher.doFinal(message);
}

From source file:br.com.zeros.tipsandtricks.cryto.EncryptionStrings.java

public static String encrypt(String valueToEnc) throws Exception {
    Key key = generateKey();/*from w  w w .j a  va  2  s .c  o m*/
    Cipher c = Cipher.getInstance(ALGORITHM);
    c.init(Cipher.ENCRYPT_MODE, key);
    byte[] encValue = c.doFinal(valueToEnc.getBytes());
    String encryptedValue = new Base64().encodeToString(encValue);
    return encryptedValue;
}

From source file:Main.java

/**
 * Encrypt data/*ww w  .  j  a  va2 s .  com*/
 * @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()));
}

From source file:Main.java

public static byte[] decrypt(byte[] data, byte[] key) throws Exception {
    SecretKey secretKey = new SecretKeySpec(key, "DESede");

    Cipher cipher = Cipher.getInstance("DESede/ECB/PKCS5Padding");
    cipher.init(Cipher.DECRYPT_MODE, secretKey);
    byte[] plainBytes = cipher.doFinal(data);
    return plainBytes;
}

From source file:MainClass.java

private static String encrypt(char[] password, String plaintext) throws Exception {

    byte[] salt = new byte[8];
    Random random = new Random();
    random.nextBytes(salt);/*from   w  w w  .  j  a  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, 1000);

    Cipher cipher = Cipher.getInstance("PBEWithSHAAndTwofish-CBC");
    cipher.init(Cipher.ENCRYPT_MODE, key, paramSpec);

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

    BASE64Encoder encoder = new BASE64Encoder();

    String saltString = encoder.encode(salt);
    String ciphertextString = encoder.encode(ciphertext);

    return saltString + ciphertextString;
}