hjow.hgtable.util.SecurityUtil.java Source code

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Here is the source code for hjow.hgtable.util.SecurityUtil.java

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/*
     
 Copyright 2015 HJOW
    
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 hjow.hgtable.util;

import hjow.hgtable.Main;
import hjow.hgtable.Manager;

import java.security.MessageDigest;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

import org.apache.commons.codec.binary.Base64;

/**
 * <p>? ?? ? ?  ? ? .</p>
 * 
 * @author HJOW
 *
 */
public class SecurityUtil {
    /**
     * <p>?? ? .</p>
     * 
     * @param text : ?? ?
     * @param algorithm :  
     * @return 
     */
    public static String hash(String text, String algorithm) {
        MessageDigest digest = null;
        String methods = algorithm;
        if (methods == null)
            methods = "SHA-256";

        try {
            digest = MessageDigest.getInstance(methods);

            byte[] beforeBytes = text.getBytes("UTF-8");
            byte[] afterBytes = digest.digest(beforeBytes);

            StringBuffer results = new StringBuffer("");

            for (int i = 0; i < afterBytes.length; i++) {
                results.append(Integer.toString(((afterBytes[i] & 0xf0) >> 4), 16));
                results.append(Integer.toString((afterBytes[i] & 0x0f), 16));
            }

            return String.valueOf(results);
        } catch (Throwable e) {

        }
        return null;
    }

    /**
     * <p>? .</p>
     * 
     * @param text : ?? ? ?
     * @param key : ? ? 
     * @param algorithm :   (null  AES )
     * @return ? ?
     */
    public static String encrypt(String text, String key, String algorithm) {
        try {
            String passwords = hash(key, null);
            String methods = algorithm;
            if (methods == null)
                methods = "AES";

            String paddings;
            int need_keySize = -1;
            boolean useIv = false;

            byte[] befores = text.trim().getBytes("UTF-8");
            byte[] keyByte = passwords.getBytes("UTF-8");

            if (methods.equalsIgnoreCase("DES")) {
                paddings = "DES/CBC/PKCS5Padding";
                need_keySize = 8;
                useIv = true;
            } else if (methods.equalsIgnoreCase("DESede")) {
                paddings = "TripleDES/ECB/PKCS5Padding";
                need_keySize = 24;
                useIv = true;
            } else if (methods.equalsIgnoreCase("AES")) {
                paddings = "AES";
                need_keySize = 16;
                useIv = false;
            } else
                return null;

            byte[] checkKeyByte = new byte[need_keySize];
            byte[] ivBytes = new byte[checkKeyByte.length];

            for (int i = 0; i < checkKeyByte.length; i++) {
                if (i < keyByte.length) {
                    checkKeyByte[i] = keyByte[i];
                } else {
                    checkKeyByte[i] = 0;
                }
            }
            keyByte = checkKeyByte;

            SecretKeySpec keySpec = new SecretKeySpec(keyByte, algorithm);
            IvParameterSpec ivSpec = null;
            if (useIv)
                ivSpec = new IvParameterSpec(ivBytes);

            Cipher cipher = null;
            byte[] outputs;

            try {
                cipher = Cipher.getInstance(paddings);
                if (useIv) {
                    cipher.init(Cipher.ENCRYPT_MODE, keySpec, ivSpec);
                } else {
                    cipher.init(Cipher.ENCRYPT_MODE, keySpec);
                }

                outputs = new byte[cipher.getOutputSize(befores.length)];
                for (int i = 0; i < outputs.length; i++) {
                    outputs[i] = 0;
                }
                int enc_len = cipher.update(befores, 0, befores.length, outputs, 0);
                enc_len = enc_len + cipher.doFinal(outputs, enc_len);

                return new String(Base64.encodeBase64(outputs), "UTF-8");
            } catch (Throwable e) {
                Main.logError(e, Manager.applyStringTable("On encrypting"));
                return null;
            }
        } catch (Throwable e) {

        }
        return null;
    }

    /**
     * <p>? ?  ?? ? .</p>
     * 
     * @param text : ? ?
     * @param key : ? ? 
     * @param algorithm : ? ?   (null  AES  )
     * @return ?? ?
     */
    public static String decrypt(String text, String key, String algorithm) {
        try {
            String passwords = hash(key, null);
            String methods = algorithm;
            if (methods == null)
                methods = "AES";

            String paddings;
            int need_keySize = -1;
            boolean useIv = false;

            byte[] befores = text.getBytes("UTF-8");
            byte[] keyByte = passwords.getBytes("UTF-8");

            if (methods.equalsIgnoreCase("DES")) {
                paddings = "DES/CBC/PKCS5Padding";
                need_keySize = 8;
                useIv = true;
            } else if (methods.equalsIgnoreCase("DESede")) {
                paddings = "TripleDES/ECB/PKCS5Padding";
                need_keySize = 168;
                useIv = true;
            } else if (methods.equalsIgnoreCase("AES")) {
                paddings = "AES";
                need_keySize = 16;
                useIv = false;
            } else
                return null;

            befores = Base64.decodeBase64(befores);

            byte[] checkKeyByte = new byte[need_keySize];
            byte[] ivBytes = new byte[checkKeyByte.length];
            for (int i = 0; i < checkKeyByte.length; i++) {
                if (i < keyByte.length) {
                    checkKeyByte[i] = keyByte[i];
                } else {
                    checkKeyByte[i] = 0;
                }
            }
            keyByte = checkKeyByte;

            SecretKeySpec keySpec = new SecretKeySpec(keyByte, methods);
            IvParameterSpec ivSpec = null;
            if (useIv)
                ivSpec = new IvParameterSpec(ivBytes);

            Cipher cipher = null;

            try {
                cipher = Cipher.getInstance(paddings);
                if (useIv) {
                    cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);
                } else {
                    cipher.init(Cipher.DECRYPT_MODE, keySpec);
                }
                byte[] outputs = new byte[cipher.getOutputSize(befores.length)];
                for (int i = 0; i < outputs.length; i++) {
                    outputs[i] = 0;
                }
                int enc_len = cipher.update(befores, 0, befores.length, outputs, 0);
                enc_len = enc_len + cipher.doFinal(outputs, enc_len);

                return new String(outputs, "UTF-8").trim();
            } catch (Throwable e) {
                Main.logError(e, Manager.applyStringTable("On decryption"));
                return text;
            }
        } catch (Throwable e) {

        }
        return null;
    }
}