HMACSHA1 Constructor (Byte[])
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HMACSHA1 Constructor (Byte())

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Initializes a new instance of the HMACSHA1 class with the specified key data.

Namespace:  System.Security.Cryptography
Assembly:  mscorlib (in mscorlib.dll)

'Declaration
Public Sub New ( _
	key As Byte() _
)

Parameters

key
Type: System.Byte ()
The secret key for HMACSHA1 encryption. The key can be any length, but if it is more than 64 bytes long it will be hashed (using SHA-1) to derive a 64-byte key. Therefore, the recommended size of the secret key is 64 bytes.

ExceptionCondition
ArgumentNullException

The key parameter is Nothing.

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.

Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

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