com.antonjohansson.elasticsearchshell.client.PasswordEncrypter.java Source code

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Here is the source code for com.antonjohansson.elasticsearchshell.client.PasswordEncrypter.java

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/**
 * Copyright 2017 Anton Johansson
 *
 * 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.antonjohansson.elasticsearchshell.client;

import static javax.crypto.Cipher.DECRYPT_MODE;
import static javax.crypto.Cipher.ENCRYPT_MODE;
import static org.apache.commons.lang3.StringUtils.rightPad;

import java.security.Key;
import java.util.Base64;

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

/**
 * Encrypts and decrypts connection passwords.
 */
class PasswordEncrypter {
    private static final int KEY_SIZE = 16;

    private String algorithm = "AES";

    void setAlgorithm(String algorithm) {
        this.algorithm = algorithm;
    }

    /**
     * Encrypts the given password, using the username as salt.
     *
     * @param username The username, used for salt.
     * @param password The password to encrypt.
     * @return Returns the encrypted password.
     */
    String encrypt(String username, String password) {
        try {
            String key = rightPad(username, KEY_SIZE).substring(0, KEY_SIZE);
            Key spec = new SecretKeySpec(key.getBytes(), algorithm);
            Cipher cipher = Cipher.getInstance(algorithm);
            cipher.init(ENCRYPT_MODE, spec);
            byte[] encrypted = cipher.doFinal(password.getBytes());
            return Base64.getEncoder().encodeToString(encrypted);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * Decrypts the given password, using the username as salt.
     *
     * @param username The username, used for salt.
     * @param password The password to decrypt.
     * @return The decrypted password.
     */
    String decrypt(String username, String password) {
        try {
            String key = rightPad(username, KEY_SIZE).substring(0, KEY_SIZE);
            Key spec = new SecretKeySpec(key.getBytes(), algorithm);
            Cipher cipher = Cipher.getInstance(algorithm);
            cipher.init(DECRYPT_MODE, spec);
            byte[] decrypted = cipher.doFinal(Base64.getDecoder().decode(password));
            return new String(decrypted);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
}