mirror of
https://github.com/saitohirga/WSJT-X.git
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109 lines
3.4 KiB
C++
109 lines
3.4 KiB
C++
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#include "otpgenerator.h"
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#include <QMessageAuthenticationCode>
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#include <QtEndian>
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#include <QDateTime>
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#include <QtMath>
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// FROM https://github.com/RikudouSage/QtOneTimePassword/
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/*
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MIT License
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Copyright (c) 2023 Dominik Chrástecký
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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OTPGenerator::OTPGenerator(QObject *parent)
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: QObject{parent}
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{
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}
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QByteArray OTPGenerator::generateHOTP(const QByteArray &rawSecret, quint64 counter, int length)
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{
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#if Q_BYTE_ORDER == Q_LITTLE_ENDIAN
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counter = qToBigEndian(counter);
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#endif
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QByteArray data;
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data.reserve(8);
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for (int i = 7; i >= 0; --i) {
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data.append(counter & 0xff);
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counter >>= 8;
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}
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QMessageAuthenticationCode mac(QCryptographicHash::Sha1);
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mac.setKey(rawSecret);
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mac.addData(data);
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QByteArray hmac = mac.result();
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int offset = hmac.at(hmac.length() - 1) & 0xf;
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quint32 truncatedHash = ((hmac.at(offset) & 0x7f) << 24)
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| ((hmac.at(offset + 1) & 0xff) << 16)
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| ((hmac.at(offset + 2) & 0xff) << 8)
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| (hmac.at(offset + 3) & 0xff);
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int modulus = int(qPow(10, length));
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return QByteArray::number(truncatedHash % modulus, 10).rightJustified(length, '0');
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}
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QString OTPGenerator::generateHOTP(const QString &secret, quint64 counter, int length)
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{
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return generateHOTP(fromBase32(secret), counter, length);
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}
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QByteArray OTPGenerator::generateTOTP(const QByteArray &rawSecret, int length)
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{
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const qint64 counter = QDateTime::currentDateTime().toMSecsSinceEpoch() / 30000;
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return generateHOTP(rawSecret, counter, length);
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}
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QString OTPGenerator::generateTOTP(const QString &secret, int length)
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{
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return generateTOTP(fromBase32(secret), length);
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}
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QString OTPGenerator::generateTOTP(const QString &secret, QDateTime dt, int length)
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{
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const qint64 counter = dt.toMSecsSinceEpoch() / 30000;
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return generateHOTP(fromBase32(secret), counter, length);
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}
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QByteArray OTPGenerator::fromBase32(const QString &input)
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{
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QByteArray result;
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result.reserve((input.length() * 5 + 7) / 8);
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int buffer = 0;
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int bitsLeft = 0;
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for (int i = 0; i < input.length(); i++) {
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int ch = input[i].toLatin1();
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int value;
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if (ch >= 'A' && ch <= 'Z')
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value = ch - 'A';
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else if (ch >= '2' && ch <= '7')
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value = 26 + ch - '2';
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else
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continue;
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buffer = (buffer << 5) | value;
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bitsLeft += 5;
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if (bitsLeft >= 8) {
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result.append(buffer >> (bitsLeft - 8));
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bitsLeft -= 8;
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}
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}
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return result;
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} |