org.whispersystems.textsecuregcm.auth.AuthenticationCredentials.java Source code

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Here is the source code for org.whispersystems.textsecuregcm.auth.AuthenticationCredentials.java

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/**
 * Copyright (C) 2013 Open WhisperSystems
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.whispersystems.textsecuregcm.auth;

import org.apache.commons.codec.binary.Hex;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;

public class AuthenticationCredentials {

    private final Logger logger = LoggerFactory.getLogger(AuthenticationCredentials.class);

    private final String hashedAuthenticationToken;
    private final String salt;

    public AuthenticationCredentials(String hashedAuthenticationToken, String salt) {
        this.hashedAuthenticationToken = hashedAuthenticationToken;
        this.salt = salt;
    }

    public AuthenticationCredentials(String authenticationToken) {
        try {
            this.salt = Math.abs(SecureRandom.getInstance("SHA1PRNG").nextInt()) + "";
            this.hashedAuthenticationToken = getHashedValue(salt, authenticationToken);
        } catch (NoSuchAlgorithmException e) {
            throw new AssertionError(e);
        }
    }

    public String getHashedAuthenticationToken() {
        return hashedAuthenticationToken;
    }

    public String getSalt() {
        return salt;
    }

    public boolean verify(String authenticationToken) {
        String theirValue = getHashedValue(salt, authenticationToken);

        logger.debug("Comparing: " + theirValue + " , " + this.hashedAuthenticationToken);

        return theirValue.equals(this.hashedAuthenticationToken);
    }

    private static String getHashedValue(String salt, String token) {
        Logger logger = LoggerFactory.getLogger(AuthenticationCredentials.class);
        logger.debug("Getting hashed token: " + salt + " , " + token);

        try {
            return new String(
                    Hex.encodeHex(MessageDigest.getInstance("SHA1").digest((salt + token).getBytes("UTF-8"))));
        } catch (NoSuchAlgorithmException | UnsupportedEncodingException e) {
            throw new AssertionError(e);
        }
    }

}