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/*-
* ============LICENSE_START=======================================================
* SDC
* ================================================================================
* Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.onap.sdc.security;
import org.apache.commons.codec.DecoderException;
import org.onap.sdc.security.logging.elements.ErrorLogOptionalData;
import org.onap.sdc.security.logging.elements.LogFieldsMdcHandler;
import org.onap.sdc.security.logging.enums.EcompLoggerErrorCode;
import org.onap.sdc.security.logging.wrappers.Logger;
import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.Arrays;
import static org.apache.commons.codec.binary.Hex.decodeHex;
public class Passwords {
private static Logger log = Logger.getLogger( Passwords.class.getName());
private static final int SALT = 0;
private static final int HASH = 1;
private static final String HASH_ALGORITHM = "SHA-256";
/**
* static utility class
*/
private Passwords() {
}
/**
* the method calculates a hash with a generated salt for the given password
*
* @param password
* @return a "salt:hash" value
*/
public static String hashPassword(String password) {
if (password!=null){
byte[] salt = getNextSalt();
byte byteData[] = hash(salt, password.getBytes());
if (byteData != null) {
return toHex(salt) + ":" + toHex(byteData);
}
}
return null;
}
/**
* the method checks if the given password matches the calculated hash
*
* @param password
* @param expectedHash
* @return
*/
public static boolean isExpectedPassword(String password, String expectedHash) {
if (password==null && expectedHash==null)
return true;
if (password==null || expectedHash==null) //iff exactly 1 is null
return false;
if (!expectedHash.contains(":")){
log.error(EcompLoggerErrorCode.BUSINESS_PROCESS_ERROR, LogFieldsMdcHandler.getInstance().getServiceName(), new ErrorLogOptionalData(),"invalid password expecting hash at the prefix of the password (ex. e0277df331f4ff8f74752ac4a8fbe03b:6dfbad308cdf53c9ff2ee2dca811ee92f1b359586b33027580e2ff92578edbd0)\n" +
"\t\t\t");
return false;
}
String[] params = expectedHash.split(":");
return isExpectedPassword(password, params[SALT], params[HASH]);
}
/**
* the method checks if the given password matches the calculated hash
*
* @param password
* @param salt
* @param hash
* the hash generated using the salt
* @return true if the password matched the hash
*/
public static boolean isExpectedPassword(String password, String salt, String hash) {
if ( password == null && hash == null )
return true;
if ( salt == null ){
log.error(EcompLoggerErrorCode.BUSINESS_PROCESS_ERROR, LogFieldsMdcHandler.getInstance().getServiceName(), new ErrorLogOptionalData(),"salt must be initialized");
return false;
}
//unintialized params
if ( password == null || hash == null )
return false;
byte[] saltBytes = fromHex(salt);
byte[] hashBytes = fromHex(hash);
byte byteData[] = hash(saltBytes, password.getBytes());
if (byteData != null) {
return Arrays.equals(byteData, hashBytes);
}
return false;
}
public static void main(String[] args) {
if (args.length > 1 || args.length > 0) {
System.out.println("[" + hashPassword(args[0]) + "]");
} else {
System.out.println("no passward passed.");
}
}
/**
* Returns a random salt to be used to hash a password.
*
* @return a 16 bytes random salt
*/
private static byte[] getNextSalt() {
byte[] salt = new byte[16];
new SecureRandom().nextBytes(salt);
return salt;
}
/**
* hase's the salt and value using the chosen algorithm
*
* @param salt
* @param password
* @return an array of bytes resulting from the hash
*/
private static byte[] hash(byte[] salt, byte[] password) {
MessageDigest md;
byte[] byteData = null;
try {
md = MessageDigest.getInstance(HASH_ALGORITHM);
md.update(salt);
md.update(password);
byteData = md.digest();
} catch (NoSuchAlgorithmException e) {
System.out.println("invalid algorithm name");
}
return byteData;
}
/**
* Converts a string of hexadecimal characters into a byte array.
*
* @param hex
* the hex string
* @return the hex string decoded into a byte array
*/
private static byte[] fromHex(String hex) {
if ( hex == null )
return null;
byte[] binary = new byte[hex.length() / 2];
for (int i = 0; i < binary.length; i++) {
binary[i] = (byte) Integer.parseInt(hex.substring(2 * i, 2 * i + 2), 16);
}
return binary;
}
/**
* Converts a byte array into a hexadecimal string.
*
* @param array
* the byte array to convert
* @return a length*2 character string encoding the byte array
*/
private static String toHex(byte[] array) {
BigInteger bi = new BigInteger(1, array);
String hex = bi.toString(16);
int paddingLength = (array.length * 2) - hex.length();
if (paddingLength > 0)
return String.format("%0" + paddingLength + "d", 0) + hex;
else
return hex;
}
}
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