/*

 * Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).

 * All rights reserved.

 * This component and the accompanying materials are made available

 * under the terms of the License "Eclipse Public License v1.0"

 * which accompanies this distribution, and is available

 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

 *

 * Initial Contributors:

 * Nokia Corporation - initial contribution.

 *

 * Contributors:

 *

 * Description: 

 *    Validation methods for WEP keys

 *

 */

/*

 * %version: 1 %

 */

#include <QString>

#include <QDebug>

#include "wepkeyvalidator.h"

/*!

    \class WepKeyValidator wepkeyvalidator.cpp

    \brief Utilities for WEP key validations.

*/

/*!

    \enum WepKeyValidator::KeyStatus

    This enum defines the validation results.

    \var WepKeyValidator::KeyStatusOk

    Key is valid.

    \var WepKeyValidator::KeyStatusIllegalCharacters

    Key contains illegal characters.

    \var WepKeyValidator::KeyStatusWepInvalidLength

    WEP key length is not valid. Valid keys are 

    - hex: 10 or 26 characters

    - ascii: 5 or 13 characters. See WlanWizardUtils::validateWpaKey().

*/

/*!

 * Process WEP key validation. Following keys are allowed:

 * 

 * HEX: 

 * - 64 bit: allowed key length = 10

 * - 128 bit: allowed key length = 26

 * 

 * ASCII:

 * - 64 bit: allowed key length = 5   

 * - 128 bit: allowed key length = 13

 * 

 * @param key WEP Key to be validated

 * 

 * @return Following values are possible

 * - KeyStatusOk

 * - KeyStatusIllegalCharacters

 * - KeyStatusWepInvalidLength

 */

WepKeyValidator::KeyStatus WepKeyValidator::validateWepKey(const QString &key)

{

    int length = key.length();

    KeyStatus ret = KeyStatusOk;

    // HEX

    if (length == WepHex64BitMaxLength || length == WepHex128BitMaxLength) {

        ret = isHex(key);

    }

    // ASCII

    else if (length == WepAscii64BitMaxLength || length == WepAscii128BitMaxLength) {

        ret = isAscii(key);

    }

    else {

        ret = KeyStatusWepInvalidLength;

    }

    return ret;

}

/*!

 * Process Ascii validation. Allowed characters are from 32 to 126.

 * 

 * @param key to be validated.

 * 

 * @return Following values are possible

 * - KeyStatusOk

 * - KeyStatusIllegalCharacters

 */

WepKeyValidator::KeyStatus WepKeyValidator::isAscii(const QString &key)

{

    QChar ch32(32);

    QChar ch126(126);

    const QChar *data = key.data();

    while (!data->isNull()) {

        if ((*data) < ch32 || (*data) > ch126) {

            return KeyStatusIllegalCharacters;

        }

        ++data;

    }

    return KeyStatusOk;

}

/*!

 * Process Hex validation. Allowed characters are

 * - from 0 to 9

 * - from a to f

 * - from A to F

 * 

 * @param key to be validated.

 * 

 * @return Following values are possible

 * - KeyStatusOk

 * - KeyStatusIllegalCharacters

 */

WepKeyValidator::KeyStatus WepKeyValidator::isHex(const QString &key)

{

    QChar ch_A(65); // Character: A

    QChar ch_F(70); // Character: F

    QChar ch_a(97); // Character: a

    QChar ch_f(102);// Character: f

    const QChar *data = key.data();

    while (!data->isNull()) {

        if (data->isDigit() ||

            (*data) >= ch_a && (*data) <= ch_f ||

            (*data) >= ch_A && (*data) <= ch_F) {

            ++data;

        }

        else {

            return KeyStatusIllegalCharacters;

        }

    }

    return KeyStatusOk;

}