com.glaf.core.security.DefaultEncryptor.java Source code

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Here is the source code for com.glaf.core.security.DefaultEncryptor.java

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/* 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.glaf.core.security;

import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.Provider;
import java.security.spec.InvalidKeySpecException;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;

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

public class DefaultEncryptor implements Encryptor {

    private PBEKeySpec pbeKeySpec;

    private PBEParameterSpec pbeParamSpec;

    private SecretKeyFactory keyFac;

    private SecretKey pbeKey;

    private byte[] salt = { (byte) 0xc7, (byte) 0x73, (byte) 0x21, (byte) 0x8c, (byte) 0x7e, (byte) 0xc8,
            (byte) 0xee, (byte) 0x99 };

    private int count = 20;

    static {
        try {
            String provider = "org.bouncycastle.jce.provider.BouncyCastleProvider";
            java.security.Security.addProvider((Provider) Class.forName(provider).newInstance());

        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

    public DefaultEncryptor() throws NoSuchAlgorithmException, InvalidKeySpecException {
        pbeParamSpec = new PBEParameterSpec(salt, count);
        pbeKeySpec = new PBEKeySpec("saagar".toCharArray());
        keyFac = SecretKeyFactory.getInstance("PBEWithMD5AndDES");
        pbeKey = keyFac.generateSecret(pbeKeySpec);
    }

    public static final byte[] decodeHex(String hex) {
        char[] chars = hex.toCharArray();
        byte[] bytes = new byte[chars.length / 2];
        int byteCount = 0;
        for (int i = 0; i < chars.length; i += 2) {
            int newByte = 0x00;
            newByte |= hexCharToByte(chars[i]);
            newByte <<= 4;
            newByte |= hexCharToByte(chars[i + 1]);
            bytes[byteCount] = (byte) newByte;
            byteCount++;
        }
        return bytes;
    }

    public static final String encodeHex(byte[] bytes) {
        StringBuffer buff = new StringBuffer(bytes.length * 2);

        for (int i = 0; i < bytes.length; i++) {
            if (((int) bytes[i] & 0xff) < 0x10) {
                buff.append("0");
            }
            buff.append(Long.toString((int) bytes[i] & 0xff, 16));
        }
        return buff.toString();
    }

    private static final byte hexCharToByte(char ch) {
        switch (ch) {
        case '0':
            return 0x00;
        case '1':
            return 0x01;
        case '2':
            return 0x02;
        case '3':
            return 0x03;
        case '4':
            return 0x04;
        case '5':
            return 0x05;
        case '6':
            return 0x06;
        case '7':
            return 0x07;
        case '8':
            return 0x08;
        case '9':
            return 0x09;
        case 'a':
            return 0x0A;
        case 'b':
            return 0x0B;
        case 'c':
            return 0x0C;
        case 'd':
            return 0x0D;
        case 'e':
            return 0x0E;
        case 'f':
            return 0x0F;
        }
        return 0x00;
    }

    private byte[] crypt(int cipherMode, byte[] bytes)
            throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidAlgorithmParameterException,
            InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
        Cipher pbeCipher = Cipher.getInstance("PBEWithMD5AndDES");
        pbeCipher.init(cipherMode, pbeKey, pbeParamSpec);
        byte[] cryptext = pbeCipher.doFinal(bytes);
        return cryptext;
    }

    public byte[] decrypt(byte[] bytes)
            throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidAlgorithmParameterException,
            InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
        return crypt(Cipher.DECRYPT_MODE, bytes);
    }

    public String decrypt(String str)
            throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidAlgorithmParameterException,
            InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
        byte[] bytes = decodeHex(str);
        byte[] decrypted = Base64.decodeBase64(new String(bytes));
        byte[] decs = crypt(Cipher.DECRYPT_MODE, decrypted);
        String decryptedText = new String(decs);
        return decryptedText;
    }

    public byte[] encrypt(byte[] bytes)
            throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidAlgorithmParameterException,
            InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
        return crypt(Cipher.ENCRYPT_MODE, bytes);
    }

    public String encrypt(String str)
            throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidAlgorithmParameterException,
            InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
        byte[] encs = crypt(Cipher.ENCRYPT_MODE, str.getBytes());
        String encryptedText = Base64.encodeBase64String(encs);
        encryptedText = encodeHex(encryptedText.getBytes());
        return encryptedText;
    }
}