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:com.liferay.util.Encryptor.java

public static String decrypt(Key key, String encryptedString) throws EncryptorException {

    try {/*from   www.  j  a  va 2  s .  c  om*/
        Security.addProvider(getProvider());

        Cipher cipher = Cipher.getInstance(key.getAlgorithm());
        cipher.init(Cipher.DECRYPT_MODE, key);

        byte[] encryptedBytes = Base64.decode(encryptedString);
        byte[] decryptedBytes = cipher.doFinal(encryptedBytes);

        String decryptedString = new String(decryptedBytes, ENCODING);

        return decryptedString;
    } catch (Exception e) {
        throw new EncryptorException(e);
    }
}

From source file:com.liferay.util.Encryptor.java

public static String encrypt(Key key, String plainText) throws EncryptorException {

    try {/*from  w w  w  . j  a v a 2 s .co m*/
        Security.addProvider(getProvider());

        Cipher cipher = Cipher.getInstance(key.getAlgorithm());
        cipher.init(Cipher.ENCRYPT_MODE, key);

        byte[] decryptedBytes = plainText.getBytes(ENCODING);
        byte[] encryptedBytes = cipher.doFinal(decryptedBytes);

        String encryptedString = Base64.encode(encryptedBytes);

        return encryptedString;
    } catch (Exception e) {
        throw new EncryptorException(e);
    }
}

From source file:com.hernandez.rey.crypto.TripleDES.java

/**
 * Use the specified TripleDES key to encrypt bytes from the input stream and write them to the output stream. This
 * method uses CipherOutputStream to perform the encryption and write bytes at the same time.
 * /*from  w w  w.  j ava2  s .c om*/
 * @param key the key to use for encryption
 * @param in the input stream to encrypt
 * @param out the encrypted output stream
 * @throws NoSuchAlgorithmException
 * @throws InvalidKeyException
 * @throws NoSuchPaddingException
 * @throws IOException
 */
public static void encrypt(final SecretKey key, final InputStream in, final OutputStream out)
        throws NoSuchAlgorithmException, InvalidKeyException, NoSuchPaddingException, IOException {
    // Create and initialize the encryption engine
    final Cipher cipher = Cipher.getInstance("DESede");
    cipher.init(Cipher.ENCRYPT_MODE, key);

    // Create a special output stream to do the work for us
    final CipherOutputStream cos = new CipherOutputStream(out, cipher);

    // Read from the input and write to the encrypting output stream
    final byte[] buffer = new byte[2048];
    int bytesRead;
    while ((bytesRead = in.read(buffer)) != -1) {
        cos.write(buffer, 0, bytesRead);
    }
    cos.close();

    // For extra security, don't leave any plaintext hanging around memory.
    java.util.Arrays.fill(buffer, (byte) 0);
}

From source file:com.os.util.PasswordDecoderEncoder.java

public static String encrypt(String plainPassword) throws Exception {
    Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
    key = convertHexToBytes(keyst);//from w  w  w. ja  v  a2s  .  c  om
    final SecretKeySpec secretKey = new SecretKeySpec(key, "AES");
    cipher.init(Cipher.ENCRYPT_MODE, secretKey);
    final String encryptedString = Base64.encodeBase64String(cipher.doFinal(plainPassword.getBytes("UTF8")));
    System.out.println(encryptedString);
    String passwordEncrypted = encryptedString.trim();

    return passwordEncrypted;

}

From source file:com.os.util.PasswordDecoderEncoder.java

public static String decrypt(String encryptPassword) throws Exception {
    Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
    key = convertHexToBytes(keyst);/*from  www  . j  a v  a 2s . c o  m*/
    final SecretKeySpec secretKey = new SecretKeySpec(key, "AES");
    cipher.init(Cipher.DECRYPT_MODE, secretKey);
    String encryptedString = new String(cipher.doFinal(Base64.decodeBase64(encryptPassword.getBytes())),
            "UTF-8");
    System.out.println(encryptedString);
    String passwordDecrypted = encryptedString.trim();

    return passwordDecrypted;

}

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

/**
 * Generate encryption key based on provided keystring.
 * //  w  w  w .j ava 2 s .c om
 * @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:hh.learnj.test.license.test.rsacoder.RSACoder.java

/**
 * ?/*from w w w  . java 2s  .  com*/
 * 
 * @param data
 *            ?
 * @param key
 *            
 * @return byte[] ?
 */
public static byte[] decryptByPrivateKey(byte[] data, byte[] key) throws Exception {
    // ??
    PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(key);
    KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
    // ??
    PrivateKey privateKey = keyFactory.generatePrivate(pkcs8KeySpec);
    // ?
    Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
    cipher.init(Cipher.DECRYPT_MODE, privateKey);
    return cipher.doFinal(data);
}

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

/**
 * ?// w  w  w . j av a 2  s  .  c o m
 * 
 * @param data?
 * @param key
 *            
 * @return byte[] ?
 */
public static byte[] encryptByPrivateKey(byte[] data, byte[] key) throws Exception {

    // ??
    PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(key);
    KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
    // ??
    PrivateKey privateKey = keyFactory.generatePrivate(pkcs8KeySpec);
    // ?
    Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
    cipher.init(Cipher.ENCRYPT_MODE, privateKey);
    return cipher.doFinal(data);
}

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

/**
 * /*from ww  w  .  j a  v  a  2 s .c  o m*/
 * 
 * @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);
}

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

/**
 * //from  w  w  w .  j  a  v a2  s  .  c  o m
 * 
 * @param data?
 * @param key
 *            
 * @return byte[] ?
 */
public static byte[] encryptByPublicKey(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.ENCRYPT_MODE, pubKey);
    return cipher.doFinal(data);
}