HMACSHA1 Constructor (array<Byte>^)

 

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

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

public:
HMACSHA1(
	array<unsigned char>^ key
)

Parameters

key
Type: array<System::Byte>^

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

Exception Condition
ArgumentNullException

The key parameter is null.

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, and then applies the hash function a second time. The output hash is 160 bits (20 bytes) in length.

System_CAPS_noteNote

This constructor creates an unmanaged instance of the algorithm by using the SHA1CryptoServiceProvider class.

For an example of how to use this constructor, see the HMACSHA1 class.

.NET Framework
Available since 1.1
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
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