QCA::PKey

#include <QtCrypto>

Inheritance diagram for QCA::PKey:

Public Types

enum  Type { RSA, DSA, DH }
 

Public Member Functions

 PKey ()
 
 PKey (const PKey &from)
 
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
 
PKeyoperator= (const PKey &from)
 
bool operator== (const PKey &a) const
 
PrivateKey toPrivateKey () const
 
PublicKey toPublicKey () const
 
Type type () const
 
- Public Member Functions inherited from QCA::Algorithm
 Algorithm (const Algorithm &from)
 
void change (Provider::Context *c)
 
void change (const QString &type, const QString &provider)
 
Provider::Contextcontext ()
 
const Provider::Contextcontext () const
 
Algorithmoperator= (const Algorithm &from)
 
Providerprovider () const
 
Provider::ContexttakeContext ()
 
QString type () const
 

Static Public Member Functions

static QList< TypesupportedIOTypes (const QString &provider=QString())
 
static QList< TypesupportedTypes (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.

Definition at line 250 of file qca_publickey.h.

Member Enumeration Documentation

Types of public key cryptography keys supported by QCA.

Enumerator
RSA 

RSA key.

DSA 

DSA key.

DH 

Diffie Hellman key.

Definition at line 256 of file qca_publickey.h.

Constructor & Destructor Documentation

QCA::PKey::PKey ( )

Standard constructor.

QCA::PKey::PKey ( const PKey from)

Standard copy constructor.

Parameters
fromthe key to copy from
QCA::PKey::PKey ( const QString type,
const QString provider 
)
protected

Create a key of the specified type.

Parameters
typethe name of the type of key to create
providerthe name of the provider to create the key in

Member Function Documentation

int QCA::PKey::bitSize ( ) const

Report the number of bits in the key.

Examples:
keyloader.cpp.
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.

bool QCA::PKey::canKeyAgree ( ) const

Test if the key can be used for key agreement.

bool QCA::PKey::isDH ( ) const

Test if the key is a Diffie Hellman key.

bool QCA::PKey::isDSA ( ) const

Test if the key is a DSA key.

bool QCA::PKey::isNull ( ) const

Test if the key is null (empty)

Returns
true if the key is null
Examples:
rsatest.cpp.
bool QCA::PKey::isPrivate ( ) const

Test if the key is a private key.

bool QCA::PKey::isPublic ( ) const

Test if the key is a public key.

bool QCA::PKey::isRSA ( ) const

Test if the key is an RSA key.

bool QCA::PKey::operator!= ( const PKey a) const

test if two keys are not equal

Parameters
athe key to compare with this key
PKey& QCA::PKey::operator= ( const PKey from)

Standard assignment operator.

Parameters
fromthe PKey to copy from
bool QCA::PKey::operator== ( const PKey a) const

test if two keys are equal

Parameters
athe key to compare with this key
void QCA::PKey::set ( const PKey k)
protected

Set the key.

Parameters
kthe key to assign from
static 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") ||
{
// 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
providerthe name of the provider to use, if a particular provider is required.
See also
supportedTypes()
Examples:
rsatest.cpp.
static 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") ||
{
// 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
providerthe name of the provider to use, if a particular provider is required.
See also
supportedIOTypes()
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
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
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
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
PrivateKey QCA::PKey::toPrivateKey ( ) const

Interpret this key as a PrivateKey.

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.
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
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
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.

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