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CngKeyUsages Enumeration

Specifies the cryptographic operations that a Cryptography Next Generation (CNG) key may be used with.

This enumeration has a FlagsAttribute attribute that allows a bitwise combination of its member values.

Namespace:  System.Security.Cryptography
Assembly:  System.Core (in System.Core.dll)

[FlagsAttribute]
public enum CngKeyUsages

Member nameDescription
NoneNo usage values are assigned to the key.
DecryptionThe key can be used for encryption and decryption.
SigningThe key can be used for signing and verification.
KeyAgreementThe key can be used for secret agreement generation and key exchange.
AllUsagesThe key can be used for all purposes.

Not all operations apply to each key. For example, an Elliptic Curve Digital Signature Algorithm (ECDSA) key cannot be used for decryption even if the Decryption usage is set.

.NET Framework

Supported in: 4, 3.5

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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