Android Open Source - android-utils Cipher Utils

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License

The source code is released under:

Apache License

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Java Source Code

/**
 * Copyright 2014 Zhenguo Jin/* w w  w.  ja v  a  2  s.c om*/
 *
 * 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 com.worthed.util;

import java.io.UnsupportedEncodingException;
import java.security.Key;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;

/**
 * ?????????
 *
 * @author jingle1267@163.com
 */
public final class CipherUtils {

    /**
     * MD5??
     * <br>http://stackoverflow.com/questions/1057041/difference-between-java-and-php5-md5-hash
     * <br>http://code.google.com/p/roboguice/issues/detail?id=89
     *
     * @param string ?????
     * @return ?????????
     */
    public static String md5(String string) {
        byte[] hash = null;
        try {
            hash = MessageDigest.getInstance("MD5").digest(
                    string.getBytes("UTF-8"));
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }

        StringBuilder hex = new StringBuilder(hash.length * 2);
        for (byte b : hash) {
            if ((b & 0xFF) < 0x10)
                hex.append("0");
            hex.append(Integer.toHexString(b & 0xFF));
        }
        return hex.toString();
    }

    /**
     * ????????DES???
     *
     * @param key ??8??????????????
     * @return ??????
     * @throws Exception
     */
    public static Key getDESKey(byte[] key) throws Exception {
        DESKeySpec des = new DESKeySpec(key);
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
        return keyFactory.generateSecret(des);
    }

    /**
     * ????????????????????????
     *
     * @param data      ????????????????????byte[]????????????
     * @param key       ???
     * @param algorithm ???
     * @return ?????????????????byte[]??????String?????????????null?
     * @throws Exception
     */
    public static String decrypt(String data, Key key, String algorithm)
            throws Exception {
        Cipher cipher = Cipher.getInstance(algorithm);
        cipher.init(Cipher.DECRYPT_MODE, key);
        String result = new String(cipher.doFinal(StringUtils
                .hexStringToByteArray(data)), "utf8");
        return result;
    }

    /**
     * ?????????????????????????????
     *
     * @param data      ???????????
     * @param key       ???
     * @param algorithm ???
     * @return ??????????byte[]???????16????????????????????null?
     */
    public static String encrypt(String data, Key key, String algorithm)
            throws Exception {
        Cipher cipher = Cipher.getInstance(algorithm);
        cipher.init(Cipher.ENCRYPT_MODE, key);
        return StringUtils.byteArrayToHexString(cipher.doFinal(data
                .getBytes("utf8")));
    }
}

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