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/*
* ====================================================================
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
* ====================================================================
*/
package org.apache.poi.xssf.usermodel.helpers;
import java.util.Arrays;
import java.util.Base64;
import java.util.Locale;
import javax.xml.namespace.QName;
import org.apache.poi.poifs.crypt.CryptoFunctions;
import org.apache.poi.poifs.crypt.HashAlgorithm;
import org.apache.poi.poifs.crypt.temp.EncryptedTempData;
import org.apache.poi.util.Internal;
import org.apache.poi.util.RandomSingleton;
import org.apache.poi.util.StringUtil;
import org.apache.xmlbeans.XmlCursor;
import org.apache.xmlbeans.XmlObject;
@Internal(since="3.15 beta 3")
public final class XSSFPasswordHelper {
private XSSFPasswordHelper() {
// no instances of this static class
}
/**
* Sets the XORed or hashed password
*
* @param xobj the xmlbeans object which contains the password attributes
* @param password the password, if null, the password attributes will be removed
* @param hashAlgo the hash algorithm, if null the password will be XORed
* @param prefix the prefix of the password attributes, may be null
*/
public static void setPassword(XmlObject xobj, String password, HashAlgorithm hashAlgo, String prefix) {
XmlCursor cur = xobj.newCursor();
try {
if (password == null) {
cur.removeAttribute(getAttrName(prefix, "password"));
cur.removeAttribute(getAttrName(prefix, "algorithmName"));
cur.removeAttribute(getAttrName(prefix, "hashValue"));
cur.removeAttribute(getAttrName(prefix, "saltValue"));
cur.removeAttribute(getAttrName(prefix, "spinCount"));
return;
}
cur.toFirstContentToken();
if (hashAlgo == null) {
int hash = CryptoFunctions.createXorVerifier1(password);
cur.insertAttributeWithValue(getAttrName(prefix, "password"),
String.format(Locale.ROOT, "%04X", hash).toUpperCase(Locale.ROOT));
} else {
byte[] salt = RandomSingleton.getInstance().generateSeed(16);
// Iterations specifies the number of times the hashing function shall be iteratively run (using each
// iteration's result as the input for the next iteration).
int spinCount = 100000;
// Implementation Notes List:
// --> In this third stage, the reversed byte order legacy hash from the second stage shall
// be converted to Unicode hex string representation
byte[] hash = CryptoFunctions.hashPassword(password, hashAlgo, salt, spinCount, false);
Base64.Encoder enc64 = Base64.getEncoder();
cur.insertAttributeWithValue(getAttrName(prefix, "algorithmName"), hashAlgo.jceId);
cur.insertAttributeWithValue(getAttrName(prefix, "hashValue"), enc64.encodeToString(hash));
cur.insertAttributeWithValue(getAttrName(prefix, "saltValue"), enc64.encodeToString(salt));
cur.insertAttributeWithValue(getAttrName(prefix, "spinCount"), ""+spinCount);
}
} finally {
cur.dispose();
}
}
/**
* Validates the password, i.e.
* calculates the hash of the given password and compares it against the stored hash
*
* @param xobj the xmlbeans object which contains the password attributes
* @param password the password, if null the method will always return false,
* even if there's no password set
* @param prefix the prefix of the password attributes, may be null
*
* @return true, if the hashes match
*/
public static boolean validatePassword(XmlObject xobj, String password, String prefix) {
// TODO: is "velvetSweatshop" the default password?
if (password == null) return false;
XmlCursor cur = xobj.newCursor();
try {
String xorHashVal = cur.getAttributeText(getAttrName(prefix, "password"));
String algoName = cur.getAttributeText(getAttrName(prefix, "algorithmName"));
String hashVal = cur.getAttributeText(getAttrName(prefix, "hashValue"));
String saltVal = cur.getAttributeText(getAttrName(prefix, "saltValue"));
String spinCount = cur.getAttributeText(getAttrName(prefix, "spinCount"));
if (xorHashVal != null) {
int hash1 = Integer.parseInt(xorHashVal, 16);
int hash2 = CryptoFunctions.createXorVerifier1(password);
return hash1 == hash2;
} else {
if (hashVal == null || algoName == null || saltVal == null || spinCount == null) {
return false;
}
Base64.Decoder dec64 = Base64.getDecoder();
byte[] hash1 = dec64.decode(hashVal);
HashAlgorithm hashAlgo = HashAlgorithm.fromString(algoName);
byte[] salt = dec64.decode(saltVal);
int spinCnt = Integer.parseInt(spinCount);
byte[] hash2 = CryptoFunctions.hashPassword(password, hashAlgo, salt, spinCnt, false);
return Arrays.equals(hash1, hash2);
}
} finally {
cur.dispose();
}
}
private static QName getAttrName(String prefix, String name) {
if (prefix == null || prefix.isEmpty()) {
return new QName(name);
} else {
return new QName(prefix + StringUtil.toUpperCase(name.charAt(0)) + name.substring(1));
}
}
}