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#include <qcryptographichash.h>

#ifdef Q_OS_SYMBIAN

#define _MD5_H_ // Needed to disable system header

#endif

#include "../../3rdparty/md5/md5.h"

#include "../../3rdparty/md5/md5.cpp"

#include "../../3rdparty/md4/md4.h"

#include "../../3rdparty/md4/md4.cpp"

#include "../../3rdparty/sha1/sha1.cpp"

QT_BEGIN_NAMESPACE

class QCryptographicHashPrivate

{

public:

    QCryptographicHash::Algorithm method;

    union {

        MD5Context md5Context;

        md4_context md4Context;

        Sha1State sha1Context;

    };

    QByteArray result;

};

/*!

  \class QCryptographicHash

  \brief The QCryptographicHash class provides a way to generate cryptographic hashes.

  \since 4.3

  \ingroup tools

  \reentrant

  QCryptographicHash can be used to generate cryptographic hashes of binary or text data.

  Currently MD4, MD5, and SHA-1 are supported.

*/

/*!

  \enum QCryptographicHash::Algorithm

  \value Md4 Generate an MD4 hash sum

  \value Md5 Generate an MD5 hash sum

  \value Sha1 Generate an SHA1 hash sum

*/

/*!

  Constructs an object that can be used to create a cryptographic hash from data using \a method.

*/

QCryptographicHash::QCryptographicHash(Algorithm method)

    : d(new QCryptographicHashPrivate)

{

    d->method = method;

    reset();

}

/*!

  Destroys the object.

*/

QCryptographicHash::~QCryptographicHash()

{

    delete d;

}

/*!

  Resets the object.

*/

void QCryptographicHash::reset()

{

    switch (d->method) {

    case Md4:

        md4_init(&d->md4Context);

        break;

    case Md5:

        MD5Init(&d->md5Context);

        break;

    case Sha1:

        sha1InitState(&d->sha1Context);

        break;

    }

    d->result.clear();

}

/*!

    Adds the first \a length chars of \a data to the cryptographic

    hash.

*/

void QCryptographicHash::addData(const char *data, int length)

{

    switch (d->method) {

    case Md4:

        md4_update(&d->md4Context, (const unsigned char *)data, length);

        break;

    case Md5:

        MD5Update(&d->md5Context, (const unsigned char *)data, length);

        break;

    case Sha1:

        sha1Update(&d->sha1Context, (const unsigned char *)data, length);

        break;

    }    

    d->result.clear();

}

/*!

  /overload

*/

void QCryptographicHash::addData(const QByteArray &data)

{

    addData(data.constData(), data.length());

}

/*!

  Returns the final hash value.

  \sa QByteArray::toHex()

*/

QByteArray QCryptographicHash::result() const

{

    if (!d->result.isEmpty()) 

        return d->result;

    switch (d->method) {

    case Md4: {

        md4_context copy = d->md4Context;

        d->result.resize(MD4_RESULTLEN);

        md4_final(&copy, (unsigned char *)d->result.data());

        break;

    }

    case Md5: {

        MD5Context copy = d->md5Context;

        d->result.resize(16);

        MD5Final(&copy, (unsigned char *)d->result.data());

        break;

    }

    case Sha1: {

        Sha1State copy = d->sha1Context;

        d->result.resize(20);

        sha1FinalizeState(&copy);

        sha1ToHash(&copy, (unsigned char *)d->result.data());

    }

    }

    return d->result;

}

/*!

  Returns the hash of \a data using \a method.

*/

QByteArray QCryptographicHash::hash(const QByteArray &data, Algorithm method)

{

    QCryptographicHash hash(method);

    hash.addData(data);

    return hash.result();

}

QT_END_NAMESPACE