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KeyUsage object

[The KeyUsage object is available for use in the operating systems specified in the Requirements section. Instead, use the X509EnhancedKeyUsageExtension Class in the System.Security.Cryptography.X509Certificates namespace.]

The KeyUsage object provides read-only access to key usage properties of a certificate.

The KeyUsage object has these types of members:

The KeyUsage object has these properties.

Property	Access type	Description
IsCritical	Read-only	Retrieves a Boolean value that indicates whether the KeyUsage extension is marked critical.
IsCRLSignEnabled	Read-only	Retrieves a Boolean value that indicates whether the CRLSign bit is set.
IsDataEnciphermentEnabled	Read-only	Retrieves a Boolean value that indicates whether the dataEncipherment bit is set.
IsDecipherOnlyEnabled	Read-only	Retrieves a Boolean value that indicates whether the decipherOnly bit is set.
IsDigitalSignatureEnabled	Read-only	Retrieves a Boolean value that indicates whether the digitalSignature bit is set.
IsEncipherOnlyEnabled	Read-only	Retrieves a Boolean value that indicates whether the encipherOnly bit is set.
IsKeyAgreementEnabled	Read-only	Retrieves a Boolean value that indicates whether the keyAgreement bit is set.
IsKeyCertSignEnabled	Read-only	Retrieves a Boolean value that indicates whether the keyCertSign bit is set.
IsKeyEnciphermentEnabled	Read-only	Retrieves a Boolean value that indicates whether the keyEncipherment bit is set.
IsNonRepudiationEnabled	Read-only	Retrieves a Boolean value that indicates whether the nonRepudiationEnabled bit is set.
IsPresent	Read-only	Retrieves a Boolean value that indicates whether the KeyUsage extension is present. This is the default property.

The KeyUsage object cannot be created.

Redistributable	CAPICOM 2.0 or later on Windows Server 2003 and Windows XP
DLL	Capicom.dll

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