QCA
md5crypt.cpp
The code below shows how to calculate an md5crypt based password.
The code below shows how to calculate an md5crypt based password. This code is compatible with the glibc code.
/*
Copyright (C) 2007 Carlo Todeschini - Metarete s.r.l. <info@metarete.it>
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/*
Algorithm inspired by Vladimir Silva's "Secure Java apps on Linux using
MD5 crypt" article
(http://www-128.ibm.com/developerworks/linux/library/l-md5crypt/)
*/
#include <QCoreApplication>
#include <QtCrypto>
#include <QtDebug>
#include <cstdio>
#ifdef QT_STATICPLUGIN
#include "import_plugins.h"
#endif
{
// Character set of the encrypted password: A-Za-z0-9./
QString itoa64 = QStringLiteral("./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz");
QString result;
while (--size >= 0) {
v = v >> 6;
}
return result;
}
int byte2unsigned(int byteValue)
{
int integerToReturn;
integerToReturn = (int)byteValue & 0xff;
return integerToReturn;
}
{
QCA::SecureArray finalState, magic_string = "$1$";
// The md5crypt algorithm uses two separate hashes
QCA::Hash hash2(QStringLiteral("md5"));
// MD5 Hash #1: pwd, magic string and salt
hash1.update(password);
hash1.update(magic_string);
hash1.update(salt);
// MD5 Hash #2: password, salt, password
hash2.update(password);
hash2.update(salt);
hash2.update(password);
finalState = hash2.final();
// Two sets of transformations based on the length of the password
// Update hash1 from offset value (i > 16 ? 16 : i)
}
// Clear array bits
finalState.fill(0);
if ((i & 1) != 0) {
hash1.update(finalState.toByteArray().left(1));
} else {
hash1.update(password.toByteArray().left(1));
}
}
finalState = hash1.final();
// Now build a 1000 entry dictionary...
for (int i = 0; i < 1000; i++) {
hash2.clear();
if ((i & 1) != 0) {
hash2.update(password);
} else {
hash2.update(finalState.toByteArray().left(16));
}
if ((i % 3) != 0) {
hash2.update(salt);
}
if ((i % 7) != 0) {
hash2.update(password);
}
if ((i & 1) != 0) {
hash2.update(finalState.toByteArray().left(16));
} else {
hash2.update(password);
}
finalState = hash2.final();
}
// Create an output string
// Salt is part of the encoded password ($1$<string>$)
QString encodedString;
encodedString.append(QStringLiteral("$"));
long l;
l = (byte2unsigned(finalState.toByteArray().at(0)) << 16 | (byte2unsigned(finalState.toByteArray().at(6))) << 8 |
byte2unsigned(finalState.toByteArray().at(12)));
encodedString.append(to64(l, 4));
l = (byte2unsigned(finalState.toByteArray().at(1)) << 16 | (byte2unsigned(finalState.toByteArray().at(7))) << 8 |
byte2unsigned(finalState.toByteArray().at(13)));
encodedString.append(to64(l, 4));
l = (byte2unsigned(finalState.toByteArray().at(2)) << 16 | (byte2unsigned(finalState.toByteArray().at(8))) << 8 |
byte2unsigned(finalState.toByteArray().at(14)));
encodedString.append(to64(l, 4));
l = (byte2unsigned(finalState.toByteArray().at(3)) << 16 | (byte2unsigned(finalState.toByteArray().at(9))) << 8 |
byte2unsigned(finalState.toByteArray().at(15)));
encodedString.append(to64(l, 4));
l = (byte2unsigned(finalState.toByteArray().at(4)) << 16 | (byte2unsigned(finalState.toByteArray().at(10))) << 8 |
byte2unsigned(finalState.toByteArray().at(5)));
encodedString.append(to64(l, 4));
l = byte2unsigned(finalState.toByteArray().at(11));
encodedString.append(to64(l, 2));
return encodedString;
}
int main(int argc, char **argv)
{
// the Initializer object sets things up, and
// also does cleanup when it goes out of scope
QCoreApplication app(argc, argv);
QCA::SecureArray password, salt;
if (argc < 3) {
printf("Usage: %s password salt (salt without $1$)\n", argv[0]);
return 1;
}
password.append(argv[1]);
salt.append(argv[2]);
// must always check that an algorithm is supported before using it
printf("MD5 hash not supported!\n");
else {
QString result = qca_md5crypt(password, salt);
// this is equivalent if you have GNU libc 2.0
// printf( "GNU md5crypt [ %s , %s ] = '%s'\n", password.data(), salt.data(), crypt( password.data(), (
// "$1$"+salt ).data() ) );
}
return 0;
}
QByteArray toByteArray() const
Copy the contents of the secure array out to a standard QByteArray.
void fill(char fillChar, int fillToPosition=-1)
Fill the data array with a specified character.
SecureArray & append(const SecureArray &a)
Append a secure byte array to the end of this array.
void init(KXmlGuiWindow *window, KGameDifficulty *difficulty=nullptr)
QCA_EXPORT bool isSupported(const char *features, const QString &provider=QString())
Test if a capability (algorithm) is available.
char at(qsizetype i) const const
QByteArray left(qsizetype len) const const
QString & append(QChar ch)
const QChar at(qsizetype position) const const
QString fromLatin1(QByteArrayView str)
This file is part of the KDE documentation.
Documentation copyright © 1996-2024 The KDE developers.
Generated on Sat Dec 21 2024 17:03:55 by doxygen 1.12.0 written by Dimitri van Heesch, © 1997-2006
Documentation copyright © 1996-2024 The KDE developers.
Generated on Sat Dec 21 2024 17:03:55 by doxygen 1.12.0 written by Dimitri van Heesch, © 1997-2006
KDE's Doxygen guidelines are available online.