corner.encrypt.services.impl.DESedeEncryptServiceImpl.java Source code

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Here is the source code for corner.encrypt.services.impl.DESedeEncryptServiceImpl.java

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/* 
 * Copyright 2009 The Corner Team.
 * 
 * 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 corner.encrypt.services.impl;

import java.io.UnsupportedEncodingException;

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

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

import corner.encrypt.services.EncryptService;
import corner.tapestry.captcha.CipherKey;

/**
 * DEsedeEncryptService
 * 
 * @author dong
 * @version $Revision$
 * @since 0.2
 */
public class DESedeEncryptServiceImpl implements EncryptService {
    private static final String CHIPERH_CHARSET = "UTF-8";
    public final static String Algorithm = "DESede";

    //   static {
    //      Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
    //   }

    private final CipherKey cipher;

    public DESedeEncryptServiceImpl(final CipherKey cipher) {
        if (cipher == null) {
            throw new IllegalArgumentException("The cipher must not be null.");
        }
        this.cipher = cipher;
    }

    /**
     * @see corner.encrypt.services.EncryptService#encrypt(byte[], byte[])
     */
    @Override
    public byte[] encrypt(byte[] src, byte[] key) {
        try {
            SecretKey deskey = new SecretKeySpec(key, Algorithm);
            Cipher c1 = Cipher.getInstance(Algorithm);
            c1.init(Cipher.ENCRYPT_MODE, deskey);
            return c1.doFinal(src);
        } catch (java.security.NoSuchAlgorithmException e1) {
            e1.printStackTrace();
        } catch (javax.crypto.NoSuchPaddingException e2) {
            e2.printStackTrace();
        } catch (java.lang.Exception e3) {
            e3.printStackTrace();
        }
        return null;
    }

    /**
     * @see corner.encrypt.services.EncryptService#decrypt(byte[], byte[])
     */
    @Override
    public byte[] decrypt(byte[] src, byte[] keybyte) {
        try {
            SecretKey deskey = new SecretKeySpec(keybyte, Algorithm);
            Cipher c1 = Cipher.getInstance(Algorithm);
            c1.init(Cipher.DECRYPT_MODE, deskey);
            return c1.doFinal(src);
        } catch (java.security.NoSuchAlgorithmException e1) {
            e1.printStackTrace();
        } catch (javax.crypto.NoSuchPaddingException e2) {
            e2.printStackTrace();
        } catch (java.lang.Exception e3) {
            e3.printStackTrace();
        }
        return null;
    }

    /**
     * @see corner.encrypt.services.EncryptService#encrypt(java.lang.String)
     */
    @Override
    public String encrypt(final String src) {
        if (src == null)
            return null;
        try {
            // 
            byte[] encoded = encrypt(src.getBytes(CHIPERH_CHARSET), cipher.getCipher());

            // ?
            return new String(Hex.encodeHex(encoded));

        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * @see corner.encrypt.services.EncryptService#decrypt(java.lang.String)
     */
    @Override
    public String decrypt(final String cryptograph) {
        if (cryptograph == null)
            return null;
        try {
            // ?
            byte[] decoded = Hex.decodeHex(cryptograph.toCharArray());
            // cryptograph.getBytes(CHIPERH_CHARSET);

            // 
            byte[] srcBytes = decrypt(decoded, cipher.getCipher());

            if (srcBytes == null)
                return null;

            return new String(srcBytes, CHIPERH_CHARSET);
        } catch (Throwable e) {
            e.printStackTrace();
        }
        return null;
    }

}