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) throws InvalidKeyException

Source Link

Document

Initializes this cipher with the public key from the given certificate.

Usage

From source file:Main.java

public static byte[] aesIGEdecrypt(byte[] tmpAESiv, byte[] tmpAesKey, byte[] data) {
    try {/*from  w w w.  j ava2  s. c  o  m*/

        ByteBuffer out = ByteBuffer.allocate(data.length);

        byte[] iv2p = Arrays.copyOfRange(tmpAESiv, 0, tmpAESiv.length / 2);
        byte[] ivp = Arrays.copyOfRange(tmpAESiv, tmpAESiv.length / 2, tmpAESiv.length);

        int len = data.length / AES_BLOCK_SIZE;

        byte[] xorInput = null;
        byte[] xorOutput = null;

        SecretKeySpec keySpec = null;
        keySpec = new SecretKeySpec(tmpAesKey, "AES");
        Cipher cipher = null;
        cipher = Cipher.getInstance("AES/ECB/NoPadding");
        cipher.init(Cipher.DECRYPT_MODE, keySpec);

        byte[] input = null;
        byte[] output = null;

        for (int i = 0; i < len; i++) {
            input = Arrays.copyOfRange(data, i * AES_BLOCK_SIZE, (i + 1) * AES_BLOCK_SIZE);
            xorInput = xor(input, ivp);
            output = cipher.doFinal(xorInput);
            xorOutput = xor(output, iv2p);
            out.put(xorOutput);

            ivp = xorOutput;
            iv2p = input;
        }
        return out.array();
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
    } catch (NoSuchPaddingException e) {
        e.printStackTrace();
    } catch (IllegalBlockSizeException e) {
        e.printStackTrace();
    } catch (BadPaddingException e) {
        e.printStackTrace();
    } catch (InvalidKeyException e) {
        e.printStackTrace();
    }

    return null;
}

From source file:eml.studio.shared.util.Aes.java

/** 
 * Aes Decryption//from   w  w  w.j  a  v  a2  s  . c  o m
 * 
 * @param encryptBytes byte[] to be decrypted
 * @param decryptKey decryption key 
 * @return 
 * @throws Exception 
 */
public static String aesDecryptByBytes(byte[] encryptBytes, String decryptKey) throws Exception {
    KeyGenerator kgen = KeyGenerator.getInstance("AES");
    kgen.init(128);

    Cipher cipher = Cipher.getInstance(ALGORITHMSTR);
    cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(decryptKey.getBytes(), "AES"));
    byte[] decryptBytes = cipher.doFinal(encryptBytes);
    return new String(decryptBytes);
}

From source file:Main.java

public static byte[] encrypt(String clearText) {
    SecretKeySpec keySpec = new SecretKeySpec(keyBytes, "AES");
    Cipher cipher = null;
    byte[] cipherText = null;

    try {/*from  w w w.  j  a  v a 2  s .  co m*/
        // init cipher
        cipher = Cipher.getInstance("AES");
        cipher.init(Cipher.ENCRYPT_MODE, keySpec);
        cipherText = cipher.doFinal(clearText.getBytes());
    } catch (IllegalBlockSizeException e) {
        e.printStackTrace();
    } catch (BadPaddingException e) {
        e.printStackTrace();
    } catch (InvalidKeyException e) {
        e.printStackTrace();
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
    } catch (NoSuchPaddingException e) {
        e.printStackTrace();
    }
    return Base64.encode(cipherText, 10);
}

From source file:Main.java

public static String decrypt(byte[] cipherText) {
    SecretKeySpec keySpec = new SecretKeySpec(keyBytes, "AES");

    Cipher cipher = null;
    byte[] clearText = null;

    try {/* www  . j a  v  a  2 s  .  c o m*/
        // init cipher
        cipher = Cipher.getInstance("AES");
        cipher.init(Cipher.DECRYPT_MODE, keySpec);
        clearText = cipher.doFinal(Base64.decode(new String(cipherText), 10));
    } catch (IllegalBlockSizeException e) {
        e.printStackTrace();
    } catch (BadPaddingException e) {
        e.printStackTrace();
    } catch (NoSuchPaddingException e) {
        e.printStackTrace();
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
    } catch (InvalidKeyException e) {// TODO Auto-generated catch block
        e.printStackTrace();
    }

    return new String(clearText);
}

From source file:Main.java

/**
 * Computes an Ephemeral ID.//  w  w w .  j  av  a  2 s.  c om
 * @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:com.agiletec.aps.util.DefaultApsEncrypter.java

public static String decrypt(String source) {
    try {//from www. ja  v  a2  s  .  co  m
        Key key = getKey();
        Cipher desCipher = Cipher.getInstance(TRIPLE_DES);
        byte[] dec = Base64.decodeBase64(source.getBytes());
        desCipher.init(Cipher.DECRYPT_MODE, key);
        byte[] cleartext = desCipher.doFinal(dec);
        // Return the clear text
        return new String(cleartext);
    } catch (Throwable t) {
        throw new RuntimeException("Error decrypting string", t);
    }
}

From source file:D_common.E_ncript.java

public static byte[] encrypt(byte[] data, String keyStr) {
    try {//from ww w  . ja  v  a  2  s  . co  m
        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
        final SecretKeySpec secretKey = new SecretKeySpec(makeAESKey(keyStr), "AES");
        cipher.init(Cipher.ENCRYPT_MODE, secretKey);
        return cipher.doFinal(data);
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}

From source file:D_common.E_ncript.java

public static byte[] decrypt(byte[] data, String keyStr) {
    try {// ww  w  .j a va  2  s  .c om
        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5PADDING");
        final SecretKeySpec secretKey = new SecretKeySpec(makeAESKey(keyStr), "AES");
        cipher.init(Cipher.DECRYPT_MODE, secretKey);
        return cipher.doFinal(data);
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}

From source file:com.iterzp.momo.utils.RSAUtils.java

/**
 * //from   w  w w  . j  a v a 2s .co m
 * 
 * @param privateKey
 *            ?
 * @param data
 *            ?
 * @return ??
 */
public static byte[] decrypt(PrivateKey privateKey, byte[] data) {
    Assert.notNull(privateKey);
    Assert.notNull(data);
    try {
        Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding", PROVIDER);
        cipher.init(Cipher.DECRYPT_MODE, privateKey);
        return cipher.doFinal(data);
    } catch (Exception e) {
        return null;
    }
}

From source file:Main.java

private static byte[] Des(byte[] byteData, byte[] byteKey, int opmode)
        throws InvalidKeyException, NoSuchAlgorithmException, InvalidKeySpecException, NoSuchPaddingException,
        IllegalBlockSizeException, BadPaddingException {
    Cipher cipher = null;
    try {//from   w ww. j a  v  a2 s. co  m
        SecretKeySpec desKey = new SecretKeySpec(byteKey, "DES");

        cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
        cipher.init(opmode, desKey);

        return cipher.doFinal(byteData);
    } finally {
        cipher = null;
    }
}