/**
* Copyright (c) 2013, impossibl.com
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of impossibl.com nor the names of its contributors may
* be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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package com.impossibl.postgres.utils;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import static java.nio.charset.StandardCharsets.US_ASCII;
import static java.nio.charset.StandardCharsets.UTF_8;
import javax.xml.bind.annotation.adapters.HexBinaryAdapter;
public class MD5Authentication {
/**
* Generates an authentication token compatible with PostgreSQL's
* MD5 scheme
*
* @param password Password to generate token from
* @param user Username to generate token from
* @param salt Salt to generate token from
* @return MD5 authentication token
*/
public static String encode(String password, String user, byte[] salt) {
HexBinaryAdapter hex = new HexBinaryAdapter();
byte[] tempDigest, passDigest;
MessageDigest md;
try {
md = MessageDigest.getInstance("MD5");
}
catch (NoSuchAlgorithmException e) {
throw new RuntimeException(e);
}
md.update(password.getBytes(UTF_8));
md.update(user.getBytes(UTF_8));
tempDigest = md.digest();
byte[] hexDigest = hex.marshal(tempDigest).toLowerCase().getBytes(US_ASCII);
md.update(hexDigest);
md.update(salt);
passDigest = md.digest();
return "md5" + hex.marshal(passDigest).toLowerCase();
}
}