CngKeyUsages Enumeration


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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)

public enum CngKeyUsages

Member nameDescription

The key can be used for all purposes.


The key can be used for encryption and decryption.


The key can be used for secret agreement generation and key exchange.


No usage values are assigned to the key.


The key can be used for signing and verification.

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
Available since 3.5
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