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System.Security Namespaces

System.Security.Cryptography

Aes Class

AesCryptoServiceProvider Class

AesManaged Class

AsnEncodedData Class

AsnEncodedDataCollection Class

AsnEncodedDataEnumerator Class

AsymmetricAlgorithm Class

AsymmetricKeyExchangeDeformatter Class

AsymmetricKeyExchangeFormatter Class

AsymmetricSignatureDeformatter Class

AsymmetricSignatureFormatter Class

CipherMode Enumeration

CngAlgorithm Class

CngAlgorithmGroup Class

CngExportPolicies Enumeration

CngKey Class

CngKeyBlobFormat Class

CngKeyCreationOptions Enumeration

CngKeyCreationParameters Class

CngKeyHandleOpenOptions Enumeration

CngKeyOpenOptions Enumeration

CngKeyUsages Enumeration

CngProperty Structure

CngPropertyCollection Class

CngPropertyOptions Enumeration

CngProvider Class

CngUIPolicy Class

CngUIProtectionLevels Enumeration

CryptoAPITransform Class

CryptoConfig Class

CryptographicAttributeObject Class

CryptographicAttributeObjectCollection Class

CryptographicAttributeObjectEnumerator Class

CryptographicException Class

CryptographicUnexpectedOperationException Class

CryptoStream Class

CryptoStreamMode Enumeration

CspKeyContainerInfo Class

CspParameters Class

CspProviderFlags Enumeration

DataProtectionScope Enumeration

DeriveBytes Class

DES Class

DESCryptoServiceProvider Class

DSA Class

DSACryptoServiceProvider Class

DSAParameters Structure

DSASignatureDeformatter Class

DSASignatureFormatter Class

ECDiffieHellman Class

ECDiffieHellmanCng Class

ECDiffieHellmanCngPublicKey Class

ECDiffieHellmanKeyDerivationFunction Enumeration

ECDiffieHellmanPublicKey Class

ECDsa Class

ECDsaCng Class

ECKeyXmlFormat Enumeration

FromBase64Transform Class

FromBase64TransformMode Enumeration

HashAlgorithm Class

HMAC Class

HMACMD5 Class

HMACRIPEMD160 Class

HMACSHA1 Class

HMACSHA256 Class

HMACSHA384 Class

HMACSHA512 Class

ICryptoTransform Interface

ICspAsymmetricAlgorithm Interface

KeyedHashAlgorithm Class

KeyNumber Enumeration

KeySizes Class

MACTripleDES Class

ManifestSignatureInformation Class

ManifestSignatureInformationCollection Class

MaskGenerationMethod Class

MD5 Class

MD5Cng Class

MD5CryptoServiceProvider Class

MemoryProtectionScope Enumeration

Oid Class

OidCollection Class

OidEnumerator Class

PaddingMode Enumeration

PasswordDeriveBytes Class

PKCS1MaskGenerationMethod Class

ProtectedData Class

ProtectedMemory Class

RandomNumberGenerator Class

RC2 Class

RC2CryptoServiceProvider Class

Rfc2898DeriveBytes Class

Rijndael Class

RijndaelManaged Class

RijndaelManagedTransform Class

RIPEMD160 Class

RIPEMD160Managed Class

RNGCryptoServiceProvider Class

RSA Class

RSACryptoServiceProvider Class

RSAOAEPKeyExchangeDeformatter Class

RSAOAEPKeyExchangeFormatter Class

RSAParameters Structure

RSAPKCS1KeyExchangeDeformatter Class

RSAPKCS1KeyExchangeFormatter Class

RSAPKCS1SignatureDeformatter Class

RSAPKCS1SignatureFormatter Class

SHA1 Class

SHA1Cng Class

SHA1CryptoServiceProvider Class

SHA1Managed Class

SHA256 Class

SHA256Cng Class

SHA256CryptoServiceProvider Class

SHA256Managed Class

SHA384 Class

SHA384Cng Class

SHA384CryptoServiceProvider Class

SHA384Managed Class

SHA512 Class

SHA512Cng Class

SHA512CryptoServiceProvider Class

SHA512Managed Class

SignatureDescription Class

SignatureVerificationResult Enumeration

StrongNameSignatureInformation Class

SymmetricAlgorithm Class

ToBase64Transform Class

TripleDES Class

TripleDESCryptoServiceProvider Class

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CngKeyUsages Enumeration

.NET Framework 4

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)

Copy

[FlagsAttribute]
public enum CngKeyUsages

	Member name	Description
	None	No usage values are assigned to the key.
	Decryption	The key can be used for encryption and decryption.
	Signing	The key can be used for signing and verification.
	KeyAgreement	The key can be used for secret agreement generation and key exchange.
	AllUsages	The 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.

Version Information

.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.

Reference

System.Security.Cryptography Namespace

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