com.adaptris.security.password.PasswordImpl.java Source code

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Here is the source code for com.adaptris.security.password.PasswordImpl.java

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/*
 * Copyright 2015 Adaptris Ltd.
 * 
 * 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.adaptris.security.password;

import java.io.ByteArrayOutputStream;
import java.io.IOException;

import org.apache.commons.io.IOUtils;

import com.adaptris.security.exc.PasswordException;
import com.adaptris.security.util.SecurityUtil;

abstract class PasswordImpl implements PasswordCodec {

    private static final int SEED = 4;

    protected PasswordImpl() {
        SecurityUtil.addProvider();
    }

    public String decode(String encrypted) throws PasswordException {
        return decode(encrypted, null);
    }

    public String encode(String plainText) throws PasswordException {
        return encode(plainText, null);
    }

    protected String getEncodingToUse(String encoding) {
        return encoding == null ? "UTF-8" : encoding;
    }

    byte[] seed(String plainText, String charset) throws IOException {
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        try {
            out.write(SecurityUtil.getSecureRandom().generateSeed(SEED));
            out.write(plainText.getBytes(getEncodingToUse(charset)));
        } finally {
            IOUtils.closeQuietly(out);
        }
        return out.toByteArray();
    }

    String unseed(byte[] decrypted, String charset) throws IOException {
        return new String(decrypted, SEED, decrypted.length - SEED, getEncodingToUse(charset));
    }
}