HMAC.Create Method

Definition

Creates an instance of an implementation of a Hash-based Message Authentication Code (HMAC) .

Overloads

Create()

Creates an instance of the default implementation of a Hash-based Message Authentication Code (HMAC).

Create(String)

Creates an instance of the specified implementation of a Hash-based Message Authentication Code (HMAC).

Create()

Creates an instance of the default implementation of a Hash-based Message Authentication Code (HMAC).

public:
 static System::Security::Cryptography::HMAC ^ Create();
public static System.Security.Cryptography.HMAC Create ();
static member Create : unit -> System.Security.Cryptography.HMAC
Public Shared Function Create () As HMAC

Returns

A new SHA-1 instance, unless the default settings have been changed by using the <cryptoClass> element.

Remarks

By default, this overload uses the SHA-1 implementation of HMAC. If you want to specify a different implementation, use the Create(String) overload, which lets you specify an algorithm name, instead.

Due to collision problems with SHA-1, Microsoft recommends a security model based on SHA-256 or better.

Create(String)

Creates an instance of the specified implementation of a Hash-based Message Authentication Code (HMAC).

public:
 static System::Security::Cryptography::HMAC ^ Create(System::String ^ algorithmName);
public static System.Security.Cryptography.HMAC Create (string algorithmName);
static member Create : string -> System.Security.Cryptography.HMAC
Public Shared Function Create (algorithmName As String) As HMAC

Parameters

algorithmName
String

The HMAC implementation to use. The following table shows the valid values for the algorithmName parameter and the algorithms they map to.

Parameter value Implements
System.Security.Cryptography.HMAC HMACSHA1
System.Security.Cryptography.KeyedHashAlgorithm HMACSHA1
HMACMD5 HMACMD5
System.Security.Cryptography.HMACMD5 HMACMD5
HMACRIPEMD160 HMACRIPEMD160
System.Security.Cryptography.HMACRIPEMD160 HMACRIPEMD160
HMACSHA1 HMACSHA1
System.Security.Cryptography.HMACSHA1 HMACSHA1
HMACSHA256 HMACSHA256
System.Security.Cryptography.HMACSHA256 HMACSHA256
HMACSHA384 HMACSHA384
System.Security.Cryptography.HMACSHA384 HMACSHA384
HMACSHA512 HMACSHA512
System.Security.Cryptography.HMACSHA512 HMACSHA512
MACTripleDES MACTripleDES
System.Security.Cryptography.MACTripleDES MACTripleDES

Returns

A new instance of the specified HMAC implementation.

Remarks

HMAC supports a number of hash algorithms, including MD5, SHA-1, SHA-256, and RIPEMD160. For the full list, see the supported values for the algorithmName parameter.

Due to collision problems with MD5 and SHA-1, Microsoft recommends a security model based on SHA-256 or better.

Applies to