com.muk.ext.security.impl.DefaultNonceService.java Source code

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Here is the source code for com.muk.ext.security.impl.DefaultNonceService.java

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/*******************************************************************************
 * Copyright (C)  2018  mizuuenikaze inc
 *
 *     This program is free software: you can redistribute it and/or modify
 *     it under the terms of the GNU General Public License as published by
 *     the Free Software Foundation, either version 3 of the License, or
 *     (at your option) any later version.
 *
 *     This program is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *     GNU General Public License for more details.
 *
 *     You should have received a copy of the GNU General Public License
 *     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *******************************************************************************/
package com.muk.ext.security.impl;

import java.nio.charset.StandardCharsets;
import java.security.InvalidKeyException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.Random;

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;

import org.apache.commons.codec.binary.Base64;

import com.muk.ext.security.NonceService;
import com.muk.ext.security.NonceStore;

/**
 * 
 * Provides basic nonce ideas around temporary urls. Needs a concrete
 * implementation of persistent storage of this nonce information.
 * 
 */
public class DefaultNonceService implements NonceService {

    private NonceStore nonceStore;

    @Override
    public byte[] generatePsudoRandomNonce() throws NoSuchAlgorithmException {
        byte[] nonce = new byte[16];
        Random rand;
        rand = SecureRandom.getInstance("SHA1PRNG");
        rand.nextBytes(nonce);

        return nonce;
    }

    @Override
    public String encode(byte[] byteArray) {
        return Base64.encodeBase64String(byteArray);
    }

    @Override
    public String encodeUrlSafe(byte[] byteArray) {
        return Base64.encodeBase64URLSafeString(byteArray);
    }

    @Override
    public String generateHash(String salt, String payload) throws NoSuchAlgorithmException, InvalidKeyException {
        return hash(salt, payload);
    }

    @Override
    public String generateHash(String payload) throws NoSuchAlgorithmException {
        String result = null;

        MessageDigest digest = MessageDigest.getInstance("SHA-256");
        result = encode(digest.digest(payload.getBytes(StandardCharsets.UTF_8)));

        return result;
    }

    @Override
    public int validatePayload(String storeId, String salt, String payload, Long timestamp, String hash)
            throws NoSuchAlgorithmException, InvalidKeyException, Exception {
        int exitCode = 0;

        if (nonceStore != null) {
            exitCode = nonceStore.validatePayloadAgainstStore(storeId, salt, timestamp);
        }

        if (exitCode == 0) {
            String receivedHash = hash(salt, payload);

            if (!hash.equals(receivedHash)) {
                return 3;
            }
        }

        return exitCode;

    }

    public void setNonceStore(NonceStore nonceStore) {
        this.nonceStore = nonceStore;
    }

    private String hash(String salt, String payload) throws NoSuchAlgorithmException, InvalidKeyException {
        Mac sha256_HMAC = Mac.getInstance("HmacSHA256");
        SecretKeySpec secret_key = new SecretKeySpec(salt.getBytes(), "HmacSHA256");
        sha256_HMAC.init(secret_key);

        return Base64.encodeBase64URLSafeString(sha256_HMAC.doFinal(payload.getBytes()));
    }
}