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:authentication.AES.java

public static String encrypt(String textopuro) throws Exception {
    Cipher encripta = Cipher.getInstance("AES/CBC/PKCS5Padding", "SunJCE");
    SecretKeySpec key = new SecretKeySpec(chaveencriptacao.getBytes("UTF-8"), "AES");
    encripta.init(Cipher.ENCRYPT_MODE, key, new IvParameterSpec(IV.getBytes("UTF-8")));
    byte[] a = encripta.doFinal(textopuro.getBytes("UTF-8"));
    return StringUtils.newStringUtf8(Base64.encodeBase64(a, false));
}

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

private 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.wabacus.util.DesEncryptTools.java

public static String encrypt(String originalString) {
    if (originalString == null || originalString.trim().equals(""))
        return "";
    if (KEY_OBJ == null) {
        log.warn("");
        return originalString;
    }/*  w w  w. j a  v a 2  s.  com*/
    try {
        Cipher c1 = Cipher.getInstance(Algorithm);
        c1.init(Cipher.ENCRYPT_MODE, KEY_OBJ);
        return base64Encode(c1.doFinal(originalString.getBytes()));
    } catch (Exception e) {
        log.error("" + originalString + "", e);
        return null;
    }
}

From source file:Main.java

public static byte[] encrypt2(byte[] data, String key) throws Exception {
    try {//from www  .  j  ava  2  s  .co  m
        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
        byte[] base64Key = Base64.decode(key, Base64.DEFAULT);
        SecretKeySpec keyspec = new SecretKeySpec(base64Key, "AES");
        cipher.init(Cipher.ENCRYPT_MODE, keyspec);
        byte[] encrypted = cipher.doFinal(data);
        return encrypted;
    } catch (Exception e) {
        e.printStackTrace();
        return null;
    }
}

From source file:Main.java

public static String encrypt(String data, String key) throws Exception {
    try {/*from  w  ww .j  a  v  a  2  s. c o m*/
        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
        byte[] base64Key = Base64.decode(key, Base64.DEFAULT);
        SecretKeySpec keyspec = new SecretKeySpec(base64Key, "AES");
        cipher.init(Cipher.ENCRYPT_MODE, keyspec);
        byte[] encrypted = cipher.doFinal(data.getBytes("UTF-8"));
        return Base64.encodeToString(encrypted, Base64.DEFAULT);
    } catch (Exception e) {
        e.printStackTrace();
        return null;
    }
}

From source file:com.cl.roadshow.crypto.AESCtr.java

/**
 * Generate encryption key based on provided keystring.
 * //  w  w  w.  j  av a2s .  co  m
 * @param keystring
 * @param bits
 * @return Encryption key
 * @throws Exception
 */
private static Key generateKey(String keystring, int bits) throws Exception {
    byte[] keyBytes = new byte[bits];
    byte[] key = new byte[bits];
    for (int i = 0; i < bits; i++) {
        //keyBytes[i] = (byte) keystring.codePointAt(i);
        // ??http://www.movable-type.co.uk/scripts/aes.html ?key
        keyBytes[i] = (byte) 0;
    }
    SecretKey secretKey = new SecretKeySpec(keyBytes, "AES");
    Cipher cipher = Cipher.getInstance("AES/ECB/NoPadding");
    cipher.init(Cipher.ENCRYPT_MODE, secretKey);
    key = cipher.doFinal(keyBytes);
    // Expand key to original length of keybytes
    for (int i = 0; i < bits - 16; i++) {
        key[16 + i] = key[i];
    }

    return new SecretKeySpec(key, "AES");
}

From source file:de.uzk.hki.da.passwordEncryptor.passwordEncryptor.java

private static String encryptPasswordForContentBroker(String password) {

    byte key[] = "394z57f4".getBytes();
    byte encryptedPassword[];

    try {//from  w ww .ja  v a  2 s . c o m
        SecretKey secretKey = SecretKeyFactory.getInstance("DES").generateSecret(new DESKeySpec(key));

        Cipher encrypt = Cipher.getInstance("DES/CBC/PKCS5Padding");
        encrypt.init(Cipher.ENCRYPT_MODE, secretKey,
                new IvParameterSpec(new byte[] { 0x01, 0x02, 0x04, 0x10, 0x01, 0x02, 0x04, 0x10 }));
        encryptedPassword = encrypt.doFinal(password.getBytes());
    } catch (GeneralSecurityException e) {
        throw new RuntimeException("Couldn't encrypt password " + password + e);
    }

    return new String(Base64.encodeBase64(encryptedPassword));
}

From source file:Main.java

/**
 * Computes an Ephemeral ID./*ww  w .  j  a  v  a  2  s .c  o m*/
 * @param key                 AES key (Advertiser Identity Key). The first 16 bytes are used.
 * @param timeCounter         Advertiser time counter
 * @param rotationExponent    Advertiser rotation exponent (0 to 15)
 * @return Final ephemeral key of 16 bytes, of which only the first 8 bytes should be used.
 * @throws NoSuchPaddingException
 * @throws NoSuchAlgorithmException
 * @throws InvalidKeyException
 * @throws BadPaddingException
 * @throws IllegalBlockSizeException
 */
@NonNull
public static byte[] computeEID(byte[] key, int timeCounter, byte rotationExponent)
        throws GeneralSecurityException {
    //        String transformation = "AES/CBC/PKCS5Padding";
    String transformation = "AES/ECB/NoPadding";
    @SuppressLint("GetInstance")
    // spec says it has to be ECB, ignore lint warning
    Cipher aes = Cipher.getInstance(transformation);
    aes.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(key, 0, 16, "AES"));

    byte[] tempKey = aes
            .doFinal(new byte[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, (byte) 0xff,
                    0x00, 0x00, (byte) ((timeCounter >>> 24) & 0xff), (byte) ((timeCounter >>> 16) & 0xff) });

    // clear K lowest bits
    timeCounter = timeCounter >>> rotationExponent << rotationExponent;

    // reset cipher with a new encryption key
    aes.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(tempKey, "AES"));
    return aes.doFinal(new byte[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            rotationExponent, (byte) ((timeCounter >>> 24) & 0xff), (byte) ((timeCounter >>> 16) & 0xff),
            (byte) ((timeCounter >>> 8) & 0xff), (byte) (timeCounter & 0xff) });
}

From source file:Main.java

/**
 * More flexible AES decrypt that doesn't encode
 *
 * @param key AES key typically 128, 192 or 256 bit
 * @param iv Initiation Vector/*from   www.ja  v a  2  s .  co m*/
 * @param decodedCipherText in bytes (assumed it's already been decoded)
 * @return Decrypted message cipher text (not encoded)
 * @throws GeneralSecurityException if something goes wrong during encryption
 */
public static byte[] decrypt(final SecretKeySpec key, final byte[] iv, final byte[] decodedCipherText)
        throws GeneralSecurityException {
    final Cipher cipher = Cipher.getInstance(AES_MODE);
    //IvParameterSpec ivSpec = new IvParameterSpec(iv);
    cipher.init(Cipher.DECRYPT_MODE, key);
    byte[] decryptedBytes = cipher.doFinal(decodedCipherText);

    log("decryptedBytes", decryptedBytes);

    return decryptedBytes;
}

From source file:hh.learnj.test.license.test.rsacoder.RSACoder.java

/**
 * /*from   w  ww . j  a v a2s. c om*/
 * 
 * @param data
 *            ?
 * @param key
 *            
 * @return byte[] ?
 */
public static byte[] decryptByPublicKey(byte[] data, byte[] key) throws Exception {

    // 
    KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
    // ?
    // ???
    X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(key);
    // 
    PublicKey pubKey = keyFactory.generatePublic(x509KeySpec);
    // ?
    Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
    cipher.init(Cipher.DECRYPT_MODE, pubKey);
    return cipher.doFinal(data);
}