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/*
========== licence begin GPL
Copyright (C) 2002-2003 SAP AG
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
========== licence end
*/
package com.sap.dbtech.jdbc;
import com.sap.dbtech.util.StructuredBytes;
/**
*
*/
public class NameHandling
{
/**
* private for statics only class
*/
private
NameHandling ()
{
}
static private String stripPassword(String pwd) {
if (pwd.length() > 0) {
/* don`t upper passwords enclosed by '"' */
char firstChar = pwd.charAt(0);
char lastChar = pwd.charAt(pwd.length() - 1);
if (!((firstChar == '"') && (lastChar == '"'))) {
pwd = pwd.toUpperCase();
} else {
pwd = pwd.substring(1, pwd.length() - 1);
}
}
return pwd;
}
static byte[] preprocessPassword(String pwd, boolean isUnicode){
pwd = stripPassword(pwd);
if (isUnicode) {
StructuredBytes pwdBytes = new StructuredBytes(pwd.length()*2);
pwdBytes.putBigUnicode(pwd.toCharArray(),0,pwd.length()*2);
return pwdBytes.getBytes(0,pwdBytes.size());
}
else {
return pwd.getBytes();
}
}
/**
*
* @return byte[]
* @param pwd
* java.lang.String
*/
static byte [] mangle (
String pwd,
boolean isUnicode)
{
final int vp1 = 2;
final int vp2 = 521;
final int vp3 = 133379;
final int maxPwdLen_C = 18;
StructuredBytes pwdBytes = new StructuredBytes(maxPwdLen_C);
String upperpwd = stripPassword(pwd);
if (isUnicode) {
pwdBytes.putBigUnicode(upperpwd.toCharArray(),0,maxPwdLen_C);
}
else {
pwdBytes.putString(upperpwd,0,maxPwdLen_C);
}
int [] clearname = pwdBytes.getIntArray(0,pwdBytes.size());
int crypt[] = new int[6];
int left, right;
StructuredBytes result;
for (int i = 1; i <= 6; ++i) {
crypt[i-1] = clearname[3*i-3] * vp3 +
clearname[3*i-2] * vp2 +
clearname[3*i-1] * vp1;
}
for (int i = 1; i <= 6; ++i) {
if (i > 1) {
left = crypt[i-2];
}
else {
left = vp3;
}
crypt[i-1] += left % 61 * (vp3 * 126 - 1);
}
for (int i = 6; i >= 1; --i) {
if (i < 5) {
right = crypt[i];
}
else {
right = vp2;
}
crypt[i-1] += right % 61 * (vp3 * 128 - 1);
}
for (int i = 0; i < 6; ++i) {
if ((crypt[i] & 1) != 0) {
crypt[i] = -crypt[i];
}
}
result = new StructuredBytes (6 * 4);
for (int i = 0; i < 6; ++i) {
result.putInt4 (crypt [i], i * 4);
}
return result.bytes ();
}
}
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