poisondog.security.DecryptMission.java Source code

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Here is the source code for poisondog.security.DecryptMission.java

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/*
 * Copyright (C) 2016 Adam Huang <poisondog@gmail.com>
 *
 * 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 poisondog.security;

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 org.apache.commons.codec.binary.Base64;
import poisondog.core.Mission;

/**
 * @author Adam Huang <poisondog@gmail.com>
 */
public class DecryptMission implements Mission<String> {
    private String mKey;
    private String mAlgorithm;

    public DecryptMission(String key) {
        this(key, "AES");
    }

    public DecryptMission(String key, String algorrithm) {
        mKey = key;
        mAlgorithm = algorrithm;
    }

    @Override
    public String execute(String input) throws NoSuchAlgorithmException, InvalidKeyException {
        SecretKeySpec skeySpec = new SecretKeySpec(mKey.getBytes(), mAlgorithm);
        try {
            Cipher cipher = Cipher.getInstance(mAlgorithm);
            byte[] decode = Base64.decodeBase64(input);
            cipher.init(Cipher.DECRYPT_MODE, skeySpec);
            byte[] original = cipher.doFinal(decode);
            return new String(original);
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
        } catch (BadPaddingException e) {
            e.printStackTrace();
        }
        return null;
    }
}