org.egov.infra.security.utils.HMAC.java Source code

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Here is the source code for org.egov.infra.security.utils.HMAC.java

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/*
 *    eGov  SmartCity eGovernance suite aims to improve the internal efficiency,transparency,
 *    accountability and the service delivery of the government  organizations.
 *
 *     Copyright (C) 2018  eGovernments Foundation
 *
 *     The updated version of eGov suite of products as by eGovernments Foundation
 *     is available at http://www.egovernments.org
 *
 *     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
 *     any later version.
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 *     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.
 *
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 *     along with this program. If not, see http://www.gnu.org/licenses/ or
 *     http://www.gnu.org/licenses/gpl.html .
 *
 *     In addition to the terms of the GPL license to be adhered to in using this
 *     program, the following additional terms are to be complied with:
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 *         1) All versions of this program, verbatim or modified must carry this
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 *
 */

package org.egov.infra.security.utils;

import org.apache.commons.codec.binary.Hex;
import org.egov.infra.exception.ApplicationRuntimeException;

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;

import static java.nio.charset.StandardCharsets.US_ASCII;
import static java.nio.charset.StandardCharsets.UTF_8;

public final class HMAC {

    private static final String HMAC_SHA_256 = "HmacSHA256";

    private HMAC() {
        //Not to be initialized
    }

    public static String digest(String message, String privateKey) {
        try {
            Mac hmac = Mac.getInstance(HMAC_SHA_256);
            hmac.init(new SecretKeySpec(privateKey.getBytes(UTF_8), HMAC_SHA_256));
            return Hex.encodeHexString(hmac.doFinal(privateKey.concat(message).getBytes(US_ASCII)));
        } catch (NoSuchAlgorithmException | InvalidKeyException e) {
            throw new ApplicationRuntimeException("Error occurred while hashing message", e);
        }
    }

    public static boolean match(String messageHash, String message, String privateKey) {
        return messageHash.equals(digest(message, privateKey));
    }
}