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.lwr.software.reporter.utils.EncryptionUtil.java

public static String encrypt(String value) {
    try {/*from ww  w.j  a v a  2  s.  c  o  m*/
        IvParameterSpec iv = new IvParameterSpec(
                DashboardConstants.INIT_VECTOR.getBytes(DashboardConstants.ENCODING));
        SecretKeySpec skeySpec = new SecretKeySpec(
                DashboardConstants.INIT_KEY.getBytes(DashboardConstants.ENCODING),
                DashboardConstants.ALGORITHM);
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
        byte[] encrypted = cipher.doFinal(value.getBytes());
        return Base64.encodeBase64String(encrypted);
    } catch (Exception ex) {
        ex.printStackTrace();
    }
    return null;
}

From source file:com.lwr.software.reporter.utils.EncryptionUtil.java

public static String decrypt(String encrypted) {
    try {//from  w w  w. ja v  a 2  s  .  com
        IvParameterSpec iv = new IvParameterSpec(
                DashboardConstants.INIT_VECTOR.getBytes(DashboardConstants.ENCODING));
        SecretKeySpec skeySpec = new SecretKeySpec(
                DashboardConstants.INIT_KEY.getBytes(DashboardConstants.ENCODING),
                DashboardConstants.ALGORITHM);
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
        cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
        byte[] original = cipher.doFinal(Base64.decodeBase64(encrypted));
        return new String(original);
    } catch (Exception ex) {
        ex.printStackTrace();
    }
    return null;
}

From source file:Main.java

public static byte[] encrypt(byte[] ivBytes, byte[] keyBytes, byte[] textBytes) {
    try {/*from  www.j a  v  a2s.c  om*/
        AlgorithmParameterSpec ivSpec = new IvParameterSpec(ivBytes);
        SecretKeySpec newKey = new SecretKeySpec(keyBytes, "AES");
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        cipher.init(Cipher.ENCRYPT_MODE, newKey, ivSpec);
        return cipher.doFinal(textBytes);
    } catch (Exception e) {
        Log.e(TAG, "Error during encryption: " + e.toString());
        return errorbyte;
    }
}

From source file:Main.java

private static Cipher genCipher(char[] pass, byte[] salt, String factory, int iterations, int mode)
        throws NoSuchAlgorithmException, InvalidKeySpecException, NoSuchPaddingException, InvalidKeyException,
        InvalidAlgorithmParameterException {
    PBEKeySpec keySpec = new PBEKeySpec(pass, salt, iterations, 128);
    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(factory);
    SecretKey key = keyFactory.generateSecret(keySpec);
    AlgorithmParameterSpec spec = new PBEParameterSpec(salt, iterations);
    Cipher cipher = Cipher.getInstance(factory);
    cipher.init(mode, key, spec);
    return cipher;
}

From source file:com.netsteadfast.greenstep.util.EncryptorUtils.java

public static String decrypt(String key1, String iv1, String encrypted) {
    try {/*from  www. ja v  a2s  . com*/
        IvParameterSpec iv = new IvParameterSpec(iv1.getBytes(Constants.BASE_ENCODING));
        SecretKeySpec skeySpec = new SecretKeySpec(key1.getBytes(Constants.BASE_ENCODING), "AES");
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
        cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
        byte[] original = cipher.doFinal(Base64.decodeBase64(encrypted));
        return new String(original);
    } catch (Exception ex) {
        ex.printStackTrace();
    }
    return null;
}

From source file:Main.java

private static Cipher getCipherFromPassphrase(String passphrase, byte[] salt, int opMode)
        throws GeneralSecurityException {
    SecretKey key = getKeyFromPassphrase(passphrase, salt);
    Cipher cipher = Cipher.getInstance(key.getAlgorithm());
    cipher.init(opMode, key, new PBEParameterSpec(salt, 100));

    return cipher;
}

From source file:com.netsteadfast.greenstep.util.EncryptorUtils.java

public static String encrypt(String key1, String iv1, String value) {
    try {/*from   w w w. j av  a2s  . co  m*/
        IvParameterSpec iv = new IvParameterSpec(iv1.getBytes(Constants.BASE_ENCODING));
        SecretKeySpec skeySpec = new SecretKeySpec(key1.getBytes(Constants.BASE_ENCODING), "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;
}

From source file:Main.java

private static byte[] cryptBy3Des(byte input[], byte key[], int cryptModel, byte iv[]) throws Exception {
    try {//  w w w .  j  av a  2s  .  c o  m
        Key k = KeyGenerator(key);
        IvParameterSpec IVSpec = iv != null ? IvGenerator(iv) : IvGenerator(defaultIV);
        Cipher c = Cipher.getInstance(desAlgorithm);
        c.init(cryptModel, k, ((java.security.spec.AlgorithmParameterSpec) (IVSpec)));
        return c.doFinal(input);
    } catch (Exception e) {
        throw e;
    }
}

From source file:com.bytecode.util.Crypto.java

private static byte[] decrypt(String keystring, byte[] message, int bits) throws Exception {
    byte[] decValue = null;
    byte[] nonceBytes = Arrays.copyOf(Arrays.copyOf(message, 8), 16);
    IvParameterSpec nonce = new IvParameterSpec(nonceBytes);

    Key key = generateKey(keystring, bits);
    Cipher c = Cipher.getInstance(ALGORITHM);
    c.init(Cipher.DECRYPT_MODE, key, nonce);
    decValue = c.doFinal(message, 8, message.length - 8);

    return decValue;
}

From source file:Main.java

private static byte[] doFinal(String key, int opmode, byte[] input)
        throws InvalidKeyException, NoSuchAlgorithmException, InvalidKeySpecException, NoSuchPaddingException,
        IllegalBlockSizeException, BadPaddingException {
    key = checkNull(key) ? DEFAULT_KEY : key;
    if (checkNull(key)) {
        return null;
    }/*from  w w w.ja  v  a 2 s.  c o  m*/
    SecureRandom sr = new SecureRandom();
    DESKeySpec dks = new DESKeySpec(key.getBytes());
    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
    SecretKey securekey = keyFactory.generateSecret(dks);
    Cipher cipher = Cipher.getInstance(MODE);
    cipher.init(opmode, securekey, sr);
    return cipher.doFinal(input);
}