HMAC.Create Method
Definition
Important
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Creates an instance of an implementation of a Hash-based Message Authentication Code (HMAC) .
Overloads
Create() |
Obsolete.
Obsolete.
Creates an instance of the default implementation of a Hash-based Message Authentication Code (HMAC). |
Create(String) |
Obsolete.
Creates an instance of the specified implementation of a Hash-based Message Authentication Code (HMAC). |
Create()
- Source:
- HMAC.cs
- Source:
- HMAC.cs
- Source:
- HMAC.cs
Caution
The default implementation of this cryptography algorithm is not supported
Caution
The default implementation of this cryptography algorithm is not supported.
Creates an instance of the default implementation of a Hash-based Message Authentication Code (HMAC).
public:
static System::Security::Cryptography::HMAC ^ Create();
[System.Obsolete("The default implementation of this cryptography algorithm is not supported", DiagnosticId="SYSLIB0007", UrlFormat="https://aka.ms/dotnet-warnings/{0}")]
public static System.Security.Cryptography.HMAC Create ();
[System.Obsolete("The default implementation of this cryptography algorithm is not supported.", DiagnosticId="SYSLIB0007", UrlFormat="https://aka.ms/dotnet-warnings/{0}")]
public static System.Security.Cryptography.HMAC Create ();
public static System.Security.Cryptography.HMAC Create ();
[<System.Obsolete("The default implementation of this cryptography algorithm is not supported", DiagnosticId="SYSLIB0007", UrlFormat="https://aka.ms/dotnet-warnings/{0}")>]
static member Create : unit -> System.Security.Cryptography.HMAC
[<System.Obsolete("The default implementation of this cryptography algorithm is not supported.", DiagnosticId="SYSLIB0007", UrlFormat="https://aka.ms/dotnet-warnings/{0}")>]
static member Create : unit -> System.Security.Cryptography.HMAC
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.
- Attributes
Exceptions
.NET Core 2.0 - 3.1 and .NET 5 and later: In all cases.
Remarks
This method is obsolete in .NET 5 and later versions.
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.
Applies to
Create(String)
- Source:
- HMAC.cs
- Source:
- HMAC.cs
- Source:
- HMAC.cs
Caution
Cryptographic factory methods accepting an algorithm name are obsolete. Use the parameterless Create factory method on the algorithm type instead.
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);
[System.Obsolete("Cryptographic factory methods accepting an algorithm name are obsolete. Use the parameterless Create factory method on the algorithm type instead.", DiagnosticId="SYSLIB0045", UrlFormat="https://aka.ms/dotnet-warnings/{0}")]
public static System.Security.Cryptography.HMAC? Create (string algorithmName);
public static System.Security.Cryptography.HMAC Create (string algorithmName);
static member Create : string -> System.Security.Cryptography.HMAC
[<System.Obsolete("Cryptographic factory methods accepting an algorithm name are obsolete. Use the parameterless Create factory method on the algorithm type instead.", DiagnosticId="SYSLIB0045", UrlFormat="https://aka.ms/dotnet-warnings/{0}")>]
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.
- Attributes
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.