CopperSpice API  1.7.2
QSslPreSharedKeyAuthenticator Class Reference

The QSslPreSharedKeyAuthenticator class provides authentication data for pre shared keys (PSK) ciphersuites. More...

Public Methods

 QSslPreSharedKeyAuthenticator ()
 
 QSslPreSharedKeyAuthenticator (const QSslPreSharedKeyAuthenticator &other)
 
 ~QSslPreSharedKeyAuthenticator ()
 
QByteArray identity () const
 
QByteArray identityHint () const
 
int maximumIdentityLength () const
 
int maximumPreSharedKeyLength () const
 
QSslPreSharedKeyAuthenticator & operator= (const QSslPreSharedKeyAuthenticator &other)
 
QSslPreSharedKeyAuthenticator & operator= (QSslPreSharedKeyAuthenticator &&other)
 
QByteArray preSharedKey () const
 
void setIdentity (const QByteArray &identity)
 
void setPreSharedKey (const QByteArray &preSharedKey)
 
void swap (QSslPreSharedKeyAuthenticator &other)
 

Friends

bool operator== (const QSslPreSharedKeyAuthenticator &lhs, const QSslPreSharedKeyAuthenticator &rhs)
 

Related Functions

These are not member functions

bool operator!= (const QSslPreSharedKeyAuthenticator &lhs, const QSslPreSharedKeyAuthenticator &rhs)
 

Detailed Description

The QSslPreSharedKeyAuthenticator class is used by an SSL socket to provide the required authentication data in a pre shared key (PSK) ciphersuite.

In a PSK handshake, the client must derive a key, which must match the key set on the server. The exact algorithm of deriving the key depends on the application, however, for this purpose the server may send an identity hint to the client. This hint combined with other information (for instance a passphrase), is then used by the client to construct the shared key.

The QSslPreSharedKeyAuthenticator provides means to client applications for completing the PSK handshake. The client application needs to connect a slot to the QSslSocket::preSharedKeyAuthenticationRequired() signal.

connect(socket, &QSslSocket::preSharedKeyAuthenticationRequired, this, &AuthManager::handlePreSharedKeyAuthentication);

The signal carries a QSslPreSharedKeyAuthenticator object containing the identity hint the server sent to the client, and which must be filled with the corresponding client identity and the derived key.

void AuthManager::handlePreSharedKeyAuthentication(QSslPreSharedKeyAuthenticator *authenticator)
{
authenticator->setIdentity("CopperSpice Program");
const QByteArray key = deriveKey(authenticator->identityHint(), passphrase);
authenticator->setPreSharedKey(key);
}
Note
PSK ciphersuites are supported only when using OpenSSL 1.0.1 (or greater) as the SSL backend.
See also
QSslSocket

Constructor & Destructor Documentation

QSslPreSharedKeyAuthenticator::QSslPreSharedKeyAuthenticator ( )

Constructs a default QSslPreSharedKeyAuthenticator object.

The identity hint, the identity and the key will be initialized to empty byte arrays; the maximum length for both the identity and the key will be initialized to 0.

QSslPreSharedKeyAuthenticator::QSslPreSharedKeyAuthenticator ( const QSslPreSharedKeyAuthenticator &  other)

Copy constructs a new QSslPreSharedKeyAuthenticator from other.

See also
operator=()
QSslPreSharedKeyAuthenticator::~QSslPreSharedKeyAuthenticator ( )

Destroys the QSslPreSharedKeyAuthenticator object.

Method Documentation

QByteArray QSslPreSharedKeyAuthenticator::identity ( ) const

Returns the PSK client identity.

See also
setIdentity()
QByteArray QSslPreSharedKeyAuthenticator::identityHint ( ) const

Returns the PSK identity hint as provided by the server. The interpretation of this hint is left to the application.

int QSslPreSharedKeyAuthenticator::maximumIdentityLength ( ) const

Returns the maximum length, in bytes, of the PSK client identity.

Note
It is possible to set an identity whose length is greater than maximumIdentityLength(), in this case, only the first maximumIdentityLength() bytes will be actually sent to the server.
See also
setIdentity()
int QSslPreSharedKeyAuthenticator::maximumPreSharedKeyLength ( ) const

Returns the maximum length, in bytes, of the pre shared key.

Note
it is possible to set a key whose length is greater than the maximumPreSharedKeyLength(), in this case, only the first maximumPreSharedKeyLength() bytes will be actually sent to the server.
See also
setPreSharedKey()
QSslPreSharedKeyAuthenticator & QSslPreSharedKeyAuthenticator::operator= ( const QSslPreSharedKeyAuthenticator &  other)

Copy assigns from other and returns a reference to this object.

QSslPreSharedKeyAuthenticator & QSslPreSharedKeyAuthenticator::operator= ( QSslPreSharedKeyAuthenticator &&  other)
inline

Move assigns from other and returns a reference to this object.

QByteArray QSslPreSharedKeyAuthenticator::preSharedKey ( ) const

Returns the pre shared key.

See also
setPreSharedKey()
void QSslPreSharedKeyAuthenticator::setIdentity ( const QByteArray identity)

Sets the PSK client identity (to be advised to the server) to identity.

Note
it is possible to set an identity whose length is greater than maximumIdentityLength(), in this case, only the first maximumIdentityLength() bytes will be actually sent to the server.
See also
identity(), maximumIdentityLength()
void QSslPreSharedKeyAuthenticator::setPreSharedKey ( const QByteArray preSharedKey)

Sets the pre shared key to preSharedKey.

Note
It is possible to set a key whose length is greater than the maximumPreSharedKeyLength(), in this case, only the first maximumPreSharedKeyLength() bytes will be actually sent to the server.
See also
preSharedKey(), maximumPreSharedKeyLength(), QByteArray::fromHex()
void QSslPreSharedKeyAuthenticator::swap ( QSslPreSharedKeyAuthenticator &  other)
inline

Swaps other with this QSslPreSharedKeyAuthenticator object. This operation is very fast and never fails.

Friends And Related Function Documentation

bool operator!= ( const QSslPreSharedKeyAuthenticator &  lhs,
const QSslPreSharedKeyAuthenticator &  rhs 
)
related

Returns true if the authenticator object lhs is different than rhs, otherwise it returns false.

bool operator== ( const QSslPreSharedKeyAuthenticator &  lhs,
const QSslPreSharedKeyAuthenticator &  rhs 
)
friend

Returns true if the authenticator object lhs is equal to rhs, otherwise it returns false.

Two authenticator objects are equal if and only if they have the same identity hint, identity, pre shared key, maximum length for the identity and maximum length for the pre shared key.