QCA::PKey Class Reference

#include <QtCrypto>

Collaboration diagram for QCA::PKey:

Public Types
enum	Type { RSA , DSA , DH }

Public Member Functions
int	bitSize () const
bool	canExport () const
bool	canKeyAgree () const
bool	isDH () const
bool	isDSA () const
bool	isNull () const
bool	isPrivate () const
bool	isPublic () const
bool	isRSA () const
bool	operator!= (const PKey &a) const
PKey &	operator= (const PKey &from)
bool	operator== (const PKey &a) const
	PKey ()
	PKey (const PKey &from)
PrivateKey	toPrivateKey () const
PublicKey	toPublicKey () const
Type	type () const
Public Member Functions inherited from QCA::Algorithm
	Algorithm (const Algorithm &from)
void	change (const QString &type, const QString &provider)
void	change (Provider::Context *c)
Provider::Context *	context ()
const Provider::Context *	context () const
Algorithm &	operator= (const Algorithm &from)
Provider *	provider () const
Provider::Context *	takeContext ()
QString	type () const

Static Public Member Functions
static QList< Type >	supportedIOTypes (const QString &provider=QString())
static QList< Type >	supportedTypes (const QString &provider=QString())

Protected Member Functions
	PKey (const QString &type, const QString &provider)
void	set (const PKey &k)
DHPrivateKey	toDHPrivateKey () const
DHPublicKey	toDHPublicKey () const
DSAPrivateKey	toDSAPrivateKey () const
DSAPublicKey	toDSAPublicKey () const
RSAPrivateKey	toRSAPrivateKey () const
RSAPublicKey	toRSAPublicKey () const
Protected Member Functions inherited from QCA::Algorithm
	Algorithm ()
	Algorithm (const QString &type, const QString &provider)

Detailed Description

General superclass for public (PublicKey) and private (PrivateKey) keys used with asymmetric encryption techniques.

Member Enumeration Documentation

Type

enum QCA::PKey::Type

Types of public key cryptography keys supported by QCA.

Enumerator
RSA	RSA key.
DSA	DSA key.
DH	Diffie Hellman key.

Constructor & Destructor Documentation

PKey() [1/3]

QCA::PKey::PKey

(

)

Standard constructor.

Referenced by operator!=(), operator=(), operator==(), PKey(), set(), and toDHPrivateKey().

PKey() [2/3]

QCA::PKey::PKey

(

const PKey &

from

)

Standard copy constructor.

Parameters

from	the key to copy from

References PKey().

PKey() [3/3]

QCA::PKey::PKey ( const QString & type, const QString & provider )

protected

Create a key of the specified type.

Parameters

type	the name of the type of key to create
provider	the name of the provider to create the key in

References QCA::Algorithm::provider(), and type().

Member Function Documentation

operator=()

PKey & QCA::PKey::operator=

(

const PKey &

from

)

Standard assignment operator.

Parameters

from	the PKey to copy from

References PKey().

supportedTypes()

QList< Type > QCA::PKey::supportedTypes ( const QString & provider = QString() )

static

Test what types of keys are supported.

Normally you would just test if the capability is present, however for PKey, you also need to test which types of keys are available. So if you want to figure out if RSA keys are supported, you need to do something like:

if(!QCA::isSupported("pkey") ||
    !QCA::PKey::supportedTypes().contains(QCA::PKey::RSA))
{
    // then there is no RSA key support
}
else
{
    // there is RSA key support
}

To make things a bit more complex, supportedTypes() only checks for basic functionality. If you want to check that you can do operations with PEM or DER (eg toPEM(), fromPEM(), and the equivalent DER and PEMfile operations, plus anything else that uses them, including the constructor form that takes a fileName), then you need to check for supportedIOTypes() instead.

Parameters

provider

the name of the provider to use, if a particular provider is required.

See also

supportedIOTypes()

References QCA::Algorithm::provider().

supportedIOTypes()

QList< Type > QCA::PKey::supportedIOTypes ( const QString & provider = QString() )

static

Test what types of keys are supported for IO operations.

If you are using PKey DER or PEM operations, then you need to check for appropriate support using this method. For example, if you want to check if you can export or import an RSA key, then you need to do something like:

if(!QCA::isSupported("pkey") ||
    !QCA::PKey::supportedIOTypes().contains(QCA::PKey::RSA))
{
    // then there is no RSA key IO support
}
else
{
    // there is RSA key IO support
}

Note that if you only want to check for basic functionality (ie not PEM or DER import/export), then you can use supportedTypes(). There is no need to use both - if the key type is supported for IO, then is also supported for basic operations.

Parameters

provider

the name of the provider to use, if a particular provider is required.

See also

supportedTypes()

Examples

rsatest.cpp.

References QCA::Algorithm::provider().

isNull()

bool QCA::PKey::isNull

(

)

const

Test if the key is null (empty).

Returns

true if the key is null

Examples

rsatest.cpp.

type()

Type QCA::PKey::type

(

)

const

Report the Type of key (eg RSA, DSA or Diffie Hellman).

See also

isRSA, isDSA and isDH for boolean tests.

Referenced by PKey(), QCA::PrivateKey::PrivateKey(), and QCA::PublicKey::PublicKey().

bitSize()

int QCA::PKey::bitSize

(

)

const

Report the number of bits in the key.

Examples

keyloader.cpp.

isRSA()

bool QCA::PKey::isRSA

(

)

const

Test if the key is an RSA key.

isDSA()

bool QCA::PKey::isDSA

(

)

const

Test if the key is a DSA key.

isDH()

bool QCA::PKey::isDH

(

)

const

Test if the key is a Diffie Hellman key.

isPublic()

bool QCA::PKey::isPublic

(

)

const

Test if the key is a public key.

isPrivate()

bool QCA::PKey::isPrivate

(

)

const

Test if the key is a private key.

canExport()

bool QCA::PKey::canExport

(

)

const

Test if the key data can be exported.

If the key resides on a smart card or other such device, this will likely return false.

canKeyAgree()

bool QCA::PKey::canKeyAgree

(

)

const

Test if the key can be used for key agreement.

toPublicKey()

PublicKey QCA::PKey::toPublicKey

(

)

const

Interpret this key as a PublicKey.

See also

toRSAPublicKey(), toDSAPublicKey() and toDHPublicKey() for protected forms of this call.

Examples

rsatest.cpp.

toPrivateKey()

PrivateKey QCA::PKey::toPrivateKey

(

)

const

Interpret this key as a PrivateKey.

operator==()

bool QCA::PKey::operator==

(

const PKey &

a

)

const

test if two keys are equal

Parameters

a	the key to compare with this key

References PKey().

operator!=()

bool QCA::PKey::operator!=

(

const PKey &

a

)

const

test if two keys are not equal

Parameters

a	the key to compare with this key

References PKey().

set()

void QCA::PKey::set ( const PKey & k )

protected

Set the key.

Parameters

k	the key to assign from

References PKey().

toRSAPublicKey()

RSAPublicKey QCA::PKey::toRSAPublicKey ( ) const

protected

Interpret this key as an RSAPublicKey.

Note

This function is essentially a convenience cast - if the key was created as a DSA key, this function cannot turn it into an RSA key.

See also

toPublicKey() for the public version of this method

toRSAPrivateKey()

RSAPrivateKey QCA::PKey::toRSAPrivateKey ( ) const

protected

Interpret this key as an RSAPrivateKey.

Note

This function is essentially a convenience cast - if the key was created as a DSA key, this function cannot turn it into a RSA key.

See also

toPrivateKey() for the public version of this method

toDSAPublicKey()

DSAPublicKey QCA::PKey::toDSAPublicKey ( ) const

protected

Interpret this key as an DSAPublicKey.

Note

This function is essentially a convenience cast - if the key was created as an RSA key, this function cannot turn it into a DSA key.

See also

toPublicKey() for the public version of this method

toDSAPrivateKey()

DSAPrivateKey QCA::PKey::toDSAPrivateKey ( ) const

protected

Interpret this key as a DSAPrivateKey.

Note

This function is essentially a convenience cast - if the key was created as an RSA key, this function cannot turn it into a DSA key.

See also

toPrivateKey() for the public version of this method

toDHPublicKey()

DHPublicKey QCA::PKey::toDHPublicKey ( ) const

protected

Interpret this key as an DHPublicKey.

Note

This function is essentially a convenience cast - if the key was created as a DSA key, this function cannot turn it into a DH key.

See also

toPublicKey() for the public version of this method

toDHPrivateKey()

DHPrivateKey QCA::PKey::toDHPrivateKey ( ) const

protected

Interpret this key as a DHPrivateKey.

Note

This function is essentially a convenience cast - if the key was created as a DSA key, this function cannot turn it into a DH key.

See also

toPrivateKey() for the public version of this method

References PKey().

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The documentation for this class was generated from the following file:

• qca_publickey.h