net.sourceforge.jaulp.crypto.aes.HexEncryptor.java Source code

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Here is the source code for net.sourceforge.jaulp.crypto.aes.HexEncryptor.java

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/**
 * Copyright (C) 2007 Asterios Raptis
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package net.sourceforge.jaulp.crypto.aes;

import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.SecretKeySpec;

import lombok.AccessLevel;
import lombok.Getter;
import lombok.NoArgsConstructor;
import lombok.Setter;
import net.sourceforge.jaulp.crypto.CryptConst;
import net.sourceforge.jaulp.crypto.algorithm.Algorithm;
import net.sourceforge.jaulp.crypto.interfaces.Encryptor;

import org.apache.commons.codec.binary.Hex;

/**
 * Instantiates a new hex encryptor.
 */
@NoArgsConstructor
public class HexEncryptor implements Encryptor {

    /**
     * The Cipher object.
     */
    @Getter
    @Setter
    private Cipher cipher = null;

    /**
     * The private key.
     */
    @Getter
    @Setter
    private String privateKey = null;

    /**
     * The algorithm.
     */
    @Getter
    @Setter
    private Algorithm algorithm = Algorithm.AES;

    /**
     * The flag initialized that indicates if the cypher is initialized for decryption.
     *
     * @return true, if is initialized
     */
    @Getter(value = AccessLevel.PRIVATE)
    private boolean initialized;

    /**
     * Default constructor.
     *
     * @param privateKey
     *            The private key.
     */
    public HexEncryptor(final String privateKey) {
        this.setPrivateKey(privateKey);
    }

    /**
     * Default constructor.
     *
     * @param privateKey
     *            The private key.
     * @param algorithm
     *            the algorithm
     */
    public HexEncryptor(final String privateKey, Algorithm algorithm) {
        this.setPrivateKey(privateKey);
        this.algorithm = algorithm;
    }

    /**
     * Encrypt the given String.
     *
     * @param string
     *            The String to encrypt.
     * @return The encrypted String.
     * @throws InvalidKeyException
     *             the invalid key exception is thrown if initialization of the cypher object fails.
     * @throws UnsupportedEncodingException
     *             is thrown by get the byte array of the private key String object fails.
     * @throws NoSuchAlgorithmException
     *             is thrown if instantiation of the cypher object fails.
     * @throws NoSuchPaddingException
     *             is thrown if instantiation of the cypher object fails.
     * @throws IllegalBlockSizeException
     *             is thrown if {@link Cipher#doFinal(byte[])} fails.
     * @throws BadPaddingException
     *             is thrown if {@link Cipher#doFinal(byte[])} fails.
     * @see net.sourceforge.jaulp.crypto.interfaces.Encryptor#encrypt(java.lang.String)
     */
    @Override
    public String encrypt(final String string) throws InvalidKeyException, UnsupportedEncodingException,
            NoSuchAlgorithmException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException {
        initialize();
        final byte[] utf8 = string.getBytes("UTF-8");
        final byte[] encrypt = this.cipher.doFinal(utf8);
        char[] original = Hex.encodeHex(encrypt, false);
        return new String(original);
    }

    /**
     * Initializes the {@link HexEncryptor} object.
     *
     * @throws UnsupportedEncodingException
     *             is thrown by get the byte array of the private key String object fails.
     * @throws NoSuchAlgorithmException
     *             is thrown if instantiation of the cypher object fails.
     * @throws NoSuchPaddingException
     *             is thrown if instantiation of the cypher object fails.
     * @throws InvalidKeyException
     *             the invalid key exception is thrown if initialization of the cypher object fails.
     */
    private void initialize() throws UnsupportedEncodingException, NoSuchAlgorithmException, NoSuchPaddingException,
            InvalidKeyException {
        if (!isInitialized()) {
            byte[] key;
            if (this.getPrivateKey() != null) {
                key = this.getPrivateKey().getBytes("UTF-8");
            } else {
                key = CryptConst.PRIVATE_KEY.getBytes("UTF-8");
            }
            SecretKeySpec skeySpec = new SecretKeySpec(key, algorithm.getAlgorithm());
            this.cipher = Cipher.getInstance(algorithm.getAlgorithm());
            cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
        }
    }

}