toxid.cpp

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/*
    Copyright © 2015-2019 by The qTox Project Contributors
 
    This file is part of qTox, a Qt-based graphical interface for Tox.
 
    qTox is libre 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 3 of the License, or
    (at your option) any later version.
 
    qTox 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 qTox.  If not, see <http://www.gnu.org/licenses/>.
*/
 
 
#include "contactid.h"
#include "toxid.h"
#include "toxpk.h"
 
#include <tox/tox.h>
 
#include <QRegularExpression>
 
#include <cassert>
#include <cstdint>
 
// Tox doesn't publicly define these
#define NOSPAM_BYTES 4
#define CHECKSUM_BYTES 2
 
#define NOSPAM_HEX_CHARS (2 * NOSPAM_BYTES)
#define CHECKSUM_HEX_CHARS (2 * CHECKSUM_BYTES)
#define TOXID_HEX_CHARS (2 * TOX_ADDRESS_SIZE)
 
const QRegularExpression ToxId::ToxIdRegEx(QString("(^|\\s)[A-Fa-f0-9]{%1}($|\\s)").arg(TOXID_HEX_CHARS));
 
ToxId::ToxId()
    : toxId()
{}
 
ToxId::ToxId(const ToxId& other)
    : toxId(other.toxId)
{}
 
ToxId::ToxId(const QString& id)
{
    if (isToxId(id)) {
        toxId = QByteArray::fromHex(id.toLatin1());
    } else {
        assert(!"ToxId constructed with invalid length string");
        toxId = QByteArray(); // invalid id string
    }
}
 
ToxId::ToxId(const QByteArray& rawId)
{
    constructToxId(rawId);
}
 
ToxId::ToxId(const uint8_t* rawId, int len)
{
    QByteArray tmpId(reinterpret_cast<const char*>(rawId), len);
    constructToxId(tmpId);
}
 
 
void ToxId::constructToxId(const QByteArray& rawId)
{
    if (rawId.length() == TOX_ADDRESS_SIZE && isToxId(rawId.toHex().toUpper())) {
        toxId = QByteArray(rawId); // construct from full toxid
    } else {
        assert(!"ToxId constructed with invalid input");
        toxId = QByteArray(); // invalid id
    }
}
 
bool ToxId::operator==(const ToxId& other) const
{
    return getPublicKey() == other.getPublicKey();
}
 
bool ToxId::operator!=(const ToxId& other) const
{
    return getPublicKey() != other.getPublicKey();
}
 
QString ToxId::toString() const
{
    return toxId.toHex().toUpper();
}
 
void ToxId::clear()
{
    toxId.clear();
}
 
const uint8_t* ToxId::getBytes() const
{
    if (isValid()) {
        return reinterpret_cast<const uint8_t*>(toxId.constData());
    }
 
    return nullptr;
}
 
ToxPk ToxId::getPublicKey() const
{
    auto const pkBytes = toxId.left(TOX_PUBLIC_KEY_SIZE);
    if (pkBytes.isEmpty()) {
        return ToxPk{};
    } else {
        return ToxPk{pkBytes};
    }
}
 
QString ToxId::getNoSpamString() const
{
    if (toxId.length() == TOX_ADDRESS_SIZE) {
        return toxId.mid(TOX_PUBLIC_KEY_SIZE, NOSPAM_BYTES).toHex().toUpper();
    }
 
    return {};
}
 
bool ToxId::isValidToxId(const QString& id)
{
    return isToxId(id) && ToxId(id).isValid();
}
 
bool ToxId::isToxId(const QString& id)
{
    return id.length() == TOXID_HEX_CHARS && id.contains(ToxIdRegEx);
}
 
bool ToxId::isValid() const
{
    if (toxId.length() != TOX_ADDRESS_SIZE) {
        return false;
    }
 
    const int size = TOX_PUBLIC_KEY_SIZE + NOSPAM_BYTES;
 
    QByteArray data = toxId.left(size);
    QByteArray checksum = toxId.right(CHECKSUM_BYTES);
    QByteArray calculated(CHECKSUM_BYTES, 0x00);
 
    for (int i = 0; i < size; i++) {
        calculated[i % 2] = calculated[i % 2] ^ data[i];
    }
 
    return calculated == checksum;
}