hashtest.cpp

The code below shows how to use the QCA::Hash class.

The code below shows how to use the QCA::Hash class

/*
Copyright (C) 2004 Brad Hards <bradh@frogmouth.net>
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.
*/
// QtCrypto/QtCrypto has the declarations for all of QCA
#include <QtCrypto>
#include <QCoreApplication>
#include <cstdio>
#ifdef QT_STATICPLUGIN
#include "import_plugins.h"
#endif
int main(int argc, char **argv)
{
// the Initializer object sets things up, and
// also does cleanup when it goes out of scope
QCA::Initializer init;
QCoreApplication app(argc, argv);
// we use the first argument if provided, or
// use "hello" if no arguments
QCA::SecureArray arg = (argc >= 2) ? argv[1] : "hello";
// must always check that an algorithm is supported before using it
if (!QCA::isSupported("sha1"))
printf("SHA1 not supported!\n");
else {
// this shows the "all in one" approach
QString result = QCA::Hash(QStringLiteral("sha1")).hashToString(arg);
printf("sha1(\"%s\") = [%s]\n", arg.data(), qPrintable(result));
}
// must always check that an algorithm is supported before using it
if (!QCA::isSupported("md5"))
printf("MD5 not supported!\n");
else {
// this shows the incremental approach. Naturally
// for this simple job, we could use the "all in one"
// approach - this is an example, after all :-)
QCA::SecureArray part1(arg.toByteArray().left(3)); // three chars - "hel"
QCA::SecureArray part2(arg.toByteArray().mid(3)); // the rest - "lo"
// create the required object.
QCA::Hash hashObject(QStringLiteral("md5"));
// we split it into two parts to show incremental update
hashObject.update(part1);
hashObject.update(part2);
// no more updates after calling final.
QCA::SecureArray resultArray = hashObject.final();
// convert the result into printable hexadecimal.
QString result = QCA::arrayToHex(resultArray.toByteArray());
printf("md5(\"%s\") = [%s]\n", arg.data(), qPrintable(result));
}
return 0;
}
QCA::Hash
General class for hashing algorithms.
Definition qca_basic.h:209
QCA::Hash::update
void update(const MemoryRegion &a) override
Update a hash, adding more of the message contents to the digest.
QCA::Hash::final
MemoryRegion final() override
Finalises input and returns the hash result.
QCA::Hash::hashToString
QString hashToString(const MemoryRegion &array)
Hash a byte array, returning it as a printable string
QCA::Initializer
Convenience method for initialising and cleaning up QCA.
Definition qca_core.h:660
QCA::SecureArray
Secure array of bytes.
Definition qca_tools.h:317
QCA::SecureArray::data
char * data()
Pointer to the data in the secure array.
QCA::SecureArray::toByteArray
QByteArray toByteArray() const
Copy the contents of the secure array out to a standard QByteArray.
QCA::arrayToHex
QCA_EXPORT QString arrayToHex(const QByteArray &array)
Convert a byte array to printable hexadecimal representation.
QCA::isSupported
QCA_EXPORT bool isSupported(const char *features, const QString &provider=QString())
Test if a capability (algorithm) is available.