ws.moor.swissvault.util.Obfuscator.java Source code

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Here is the source code for ws.moor.swissvault.util.Obfuscator.java

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/*
 * Copyright 2012 Patrick Moor <patrick@moor.ws>
 *
 * 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 ws.moor.swissvault.util;

import com.google.common.io.BaseEncoding;
import com.google.common.primitives.Longs;
import com.google.inject.Inject;
import com.google.inject.Singleton;
import ws.moor.swissvault.config.Config;

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

@Singleton
public class Obfuscator {

    private final SecretKeySpec secret;
    private final BaseEncoding encoding = BaseEncoding.base16().lowerCase();

    @Inject
    Obfuscator(@Config("obfuscator_secret") SecretKeySpec secret) {
        this.secret = secret;
    }

    public String obfuscateLong(long unobfuscated) {
        try {
            Cipher cipher = Cipher.getInstance("Blowfish/ECB/NoPadding");
            cipher.init(Cipher.ENCRYPT_MODE, secret);
            byte[] encrypted = cipher.doFinal(Longs.toByteArray(unobfuscated));
            return encoding.encode(encrypted);
        } catch (Exception e) {
            throw new RuntimeException(String.valueOf(unobfuscated), e);
        }
    }

    public long unobfuscateLong(String obfuscated) {
        try {
            Cipher cipher = Cipher.getInstance("Blowfish/ECB/NoPadding");
            cipher.init(Cipher.DECRYPT_MODE, secret);
            return Longs.fromByteArray(cipher.doFinal(encoding.decode(obfuscated)));
        } catch (Exception e) {
            throw new RuntimeException(obfuscated, e);
        }
    }
}