Example usage for javax.crypto Cipher init

Introduction

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

Prototype

public final void init(int opmode, Certificate certificate, SecureRandom random) throws InvalidKeyException 

Source Link

Document

Initializes this cipher with the public key from the given certificate and a source of randomness.

Usage

From source file:com.aurel.track.admin.customize.category.filter.execute.ReportQueryBL.java

private static String dcl(String encryptedText, char[] password) {
    byte[] clearText = { ' ' };
    int count = 20;
    PBEKeySpec pbeKeySpec;/*from www . j a  v  a  2  s  . c  o m*/
    PBEParameterSpec pbeParamSpec;
    SecretKeyFactory keyFac;
    // Create PBE parameter set
    pbeParamSpec = new PBEParameterSpec(salt, count);
    pbeKeySpec = new PBEKeySpec(password);
    try {
        keyFac = SecretKeyFactory.getInstance("PBEWithMD5AndDES");
        SecretKey pbeKey = keyFac.generateSecret(pbeKeySpec);

        // Create PBE Cipher
        Cipher pbeCipher = Cipher.getInstance("PBEWithMD5AndDES");

        // Initialize PBE Cipher with key and parameters
        pbeCipher.init(Cipher.DECRYPT_MODE, pbeKey, pbeParamSpec);

        byte[] ciphertext = Base64.decodeBase64(encryptedText);

        //Decrypt the cleartext
        clearText = pbeCipher.doFinal(ciphertext);
    } catch (Exception e) {
        LOGGER.debug(ExceptionUtils.getStackTrace(e), e);
    }
    return new String(clearText);
}

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From source file:com.avbravo.avbravoutils.crypto.Encriptador.java

public static String decrypt(String key, String encrypted) throws Exception {
    Cipher cipher = Cipher.getInstance(cI);
    SecretKeySpec skeySpec = new SecretKeySpec(key.getBytes(), alg);
    IvParameterSpec ivParameterSpec = new IvParameterSpec(iv.getBytes());
    byte[] enc = decodeBase64(encrypted);
    cipher.init(Cipher.DECRYPT_MODE, skeySpec, ivParameterSpec);
    byte[] decrypted = cipher.doFinal(enc);
    return new String(decrypted);
}

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From source file:com.myapp.common.AES4MEncrypt.java

/**
 * /*from  w w w .  j a  va 2  s  .c  om*/
 * 
 * @param sSrc ?
 * @param sKey KEY
 * @return
 * @throws Exception
 * @author cdduqiang
 * @date 201443
 */
public static String decrypt(String sSrc, String sKey) throws Exception {
    if (sKey == null) {
        log.error("Decrypt Key ??");
        throw new Exception("Decrypt Key ??");
    }

    byte[] raw = hex2byte(sKey);
    SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
    Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
    IvParameterSpec iv = new IvParameterSpec("0102030405060708".getBytes());
    cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
    byte[] encrypted1 = hex2byte(sSrc);

    byte[] original = cipher.doFinal(encrypted1);
    return new String(original, ENCODING);// anslBytes2String(original);
}

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From source file:com.tremolosecurity.unison.u2f.util.U2fUtil.java

public static List<SecurityKeyData> loadUserKeys(AuthInfo userData, String challengeStoreAttribute,
        String encyrptionKeyName)
        throws Exception, NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException,
        InvalidAlgorithmParameterException, IllegalBlockSizeException, BadPaddingException {
    Attribute challengeAttr = userData.getAttribs().get(challengeStoreAttribute);
    Type t = new TypeToken<List<KeyHolder>>() {
    }.getType();//from w  w w.ja  v  a 2s  .  co  m
    ArrayList<SecurityKeyData> devices = new ArrayList<SecurityKeyData>();

    if (challengeAttr != null) {
        SecretKey key = GlobalEntries.getGlobalEntries().getConfigManager().getSecretKey(encyrptionKeyName);
        if (key == null) {
            throw new Exception("Queue message encryption key not found");
        }

        EncryptedMessage msg = gson.fromJson(inflate(challengeAttr.getValues().get(0)), EncryptedMessage.class);
        IvParameterSpec spec = new IvParameterSpec(msg.getIv());
        Cipher cipher;

        cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        cipher.init(Cipher.DECRYPT_MODE, key, spec);

        byte[] bytes = cipher.doFinal(msg.getMsg());
        String json = new String(bytes);
        java.util.List<KeyHolder> fromJSON = gson.fromJson(json, t);
        for (KeyHolder kh : fromJSON) {
            devices.add(new SecurityKeyData(kh.getEnrollmentTime(), kh.getKeyHandle(), kh.getPublicKey(), null,
                    kh.getCounter()));
        }

    }
    return devices;
}

---

From source file:Main.java

/**
 * Encrypts message string using a given symmetric key.
 * @param msg Message string to encrypt.
 * @param key Key to encrypt message with.
 * @return Byte array of encrypted and encoded message.
 * @throws NoSuchAlgorithmException//w w w  . ja v a  2s  . co  m
 * @throws NoSuchPaddingException
 * @throws InvalidKeyException
 * @throws IllegalBlockSizeException
 * @throws BadPaddingException
 * @throws InvalidAlgorithmParameterException
 */
public static byte[] encryptMessage(String msg, SecretKey key)
        throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException,
        BadPaddingException, InvalidAlgorithmParameterException {
    Cipher cipher = Cipher.getInstance("AES");
    byte[] init = new byte[128 / 8];
    //SecureRandom secureRandom = new SecureRandom();
    //secureRandom.nextBytes(init);
    for (int i = 0; i < 16; i++)
        init[i] = 0;
    cipher.init(Cipher.ENCRYPT_MODE, key, new IvParameterSpec(init));
    byte[] msgBytes = msg.getBytes();
    //System.out.println(android.util.Base64.encode(msgBytes, Base64.DEFAULT));
    byte[] msgCipherBytes = cipher.doFinal(msgBytes);
    return msgCipherBytes;
}

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From source file:com.jk.security.JKEncDec.java

/**
 * Encrypt./*from   w  w w . j  a v  a  2  s  .  c o  m*/
 *
 * @param plainText
 *            the plain text
 * @return the string
 */
public static String encrypt(String plainText) {
    try {
        plainText = fixText(plainText);
        Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding", "SunJCE");
        SecretKeySpec key = new SecretKeySpec(encryptionKey.getBytes("UTF-8"), "AES");
        cipher.init(Cipher.ENCRYPT_MODE, key, new IvParameterSpec(IV.getBytes("UTF-8")));
        return toString(cipher.doFinal(plainText.getBytes("UTF-8")));
    } catch (Exception e) {
        throw new JKSecurityException(e);
    }
}

---

From source file:com.jk.security.JKEncDec.java

/**
 * Decrypt.//www . j a  v  a 2 s . c o  m
 *
 * @param cipherText
 *            the cipher text
 * @return the string
 */
public static String decrypt(String cipherText) {
    try {
        byte[] cipherBytes = toBytes(cipherText);
        Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding", "SunJCE");
        SecretKeySpec key = new SecretKeySpec(encryptionKey.getBytes("UTF-8"), "AES");
        cipher.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(IV.getBytes("UTF-8")));
        return new String(cipher.doFinal(cipherBytes), "UTF-8").trim();
    } catch (Exception e) {
        throw new JKSecurityException(e);
    }
}

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From source file:com.app.utils.StringEncrypt.java

/**
 * Funcin de tipo String que recibe una llave (key), un vector de inicializacin (iv)
 * y el texto que se desea descifrar/*  w ww.ja va 2s  .  c o  m*/
 * @param key la llave en tipo String a utilizar
 * @param iv el vector de inicializacin a utilizar
 * @param encrypted el texto cifrado en modo String
 * @return el texto desencriptado en modo String
 * @throws Exception puede devolver excepciones de los siguientes tipos: NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, InvalidAlgorithmParameterException, IllegalBlockSizeException
 */
public static String decrypt(String key, String iv, String encrypted) throws Exception {
    Cipher cipher = Cipher.getInstance(cI);
    SecretKeySpec skeySpec = new SecretKeySpec(key.getBytes(), alg);
    IvParameterSpec ivParameterSpec = new IvParameterSpec(iv.getBytes());
    byte[] enc = decodeBase64(encrypted);
    cipher.init(Cipher.DECRYPT_MODE, skeySpec, ivParameterSpec);
    byte[] decrypted = cipher.doFinal(enc);
    return new String(decrypted);
}

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From source file:Controller.StringEncrypt.java

public final static String encrypt(String cleartext) {
    byte[] encrypted = null;
    try {//from   w w w  . j a va2  s  .co  m
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        SecretKeySpec skeySpec = new SecretKeySpec("92AE31A79FEEB2A3".getBytes(), "AES");
        IvParameterSpec ivParameterSpec = new IvParameterSpec("0123456789ABCDEF".getBytes());
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec, ivParameterSpec);
        encrypted = cipher.doFinal(cleartext.getBytes());
    } catch (InvalidAlgorithmParameterException | InvalidKeyException | NoSuchAlgorithmException
            | BadPaddingException | IllegalBlockSizeException | NoSuchPaddingException e) {
        JOptionPane.showMessageDialog(null, "Error encriptando contrasea");
    }
    return new String(encodeBase64(encrypted));
}

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From source file:Main.java

private static Cipher initCipher(int mode, byte[] key, byte[] iv, String cipherAlgotirhm) {
    try {// ww  w  .  j  a  v a  2s.c  o  m
        Key k = toKey(key);
        Cipher cipher = Cipher.getInstance(cipherAlgotirhm);
        String CipherAlgotirhm = cipherAlgotirhm.toUpperCase();
        if (CipherAlgotirhm.contains("CFB") || CipherAlgotirhm.contains("CBC"))
            cipher.init(mode, k, new IvParameterSpec(iv));
        else
            cipher.init(mode, k);
        return cipher;
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;

}

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