117 lines
3.7 KiB
Java
117 lines
3.7 KiB
Java
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/* ====================================================================
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Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for additional information regarding copyright ownership.
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The ASF licenses this file to You under the Apache License, Version 2.0
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(the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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==================================================================== */
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package org.apache.poi.hssf.record;
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import org.apache.poi.util.LittleEndian;
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/**
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* Title: Password Record<P>
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* Description: stores the encrypted password for a sheet or workbook (HSSF doesn't support encryption)
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* REFERENCE: PG 371 Microsoft Excel 97 Developer's Kit (ISBN: 1-57231-498-2)<P>
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* @author Andrew C. Oliver (acoliver at apache dot org)
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* @version 2.0-pre
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*/
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public class PasswordRecord extends Record {
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public final static short sid = 0x13;
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private short field_1_password; // not sure why this is only 2 bytes, but it is... go figure
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public PasswordRecord() {
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}
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public PasswordRecord(RecordInputStream in) {
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field_1_password = in.readShort();
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}
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//this is the world's lamest "security". thanks to Wouter van Vugt for making me
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//not have to try real hard. -ACO
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public static short hashPassword(String password) {
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byte[] passwordCharacters = password.getBytes();
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int hash = 0;
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if (passwordCharacters.length > 0) {
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int charIndex = passwordCharacters.length;
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while (charIndex-- > 0) {
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hash = ((hash >> 14) & 0x01) | ((hash << 1) & 0x7fff);
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hash ^= passwordCharacters[charIndex];
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}
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// also hash with charcount
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hash = ((hash >> 14) & 0x01) | ((hash << 1) & 0x7fff);
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hash ^= passwordCharacters.length;
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hash ^= (0x8000 | ('N' << 8) | 'K');
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}
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return (short)hash;
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}
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/**
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* set the password
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*
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* @param password representing the password
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*/
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public void setPassword(short password) {
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field_1_password = password;
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}
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/**
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* get the password
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*
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* @return short representing the password
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*/
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public short getPassword() {
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return field_1_password;
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}
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public String toString() {
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StringBuffer buffer = new StringBuffer();
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buffer.append("[PASSWORD]\n");
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buffer.append(" .password = ")
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.append(Integer.toHexString(getPassword())).append("\n");
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buffer.append("[/PASSWORD]\n");
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return buffer.toString();
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}
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public int serialize(int offset, byte [] data) {
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LittleEndian.putShort(data, 0 + offset, sid);
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LittleEndian.putShort(data, 2 + offset,
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(( short ) 0x02)); // 2 bytes (6 total)
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LittleEndian.putShort(data, 4 + offset, getPassword());
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return getRecordSize();
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}
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protected int getDataSize() {
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return 2;
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}
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public short getSid() {
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return sid;
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}
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/**
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* Clone this record.
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*/
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public Object clone() {
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PasswordRecord clone = new PasswordRecord();
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clone.setPassword(field_1_password);
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return clone;
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}
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}
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