HMACSHA1 Constructor (Byte)
Updated: March 2011
Initializes a new instance of the HMACSHA1 class with the specified key data.
Assembly: mscorlib (in mscorlib.dll)
HMACSHA1 is a type of keyed hash algorithm that is constructed from the SHA1 hash function and used as an HMAC, or hash-based message authentication code. The HMAC process mixes a secret key with the message data, hashes the result with the hash function, mixes that hash value with the secret key again, then applies the hash function a second time. The output hash will be 160 bits (20 bytes) in length.
This constructor creates an unmanaged instance of the algorithm by using the SHA1CryptoServiceProvider class.
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.