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HMACMD5 Constructor (Byte[])

Initializes a new instance of the HMACMD5 class by using the specified key.

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

new : 
        key:byte[] -> HMACMD5

Parameters

key
Type: System.Byte[]

The secret key for HMACMD5 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 a null reference (Nothing in Visual Basic).

HMACMD5 is a type of keyed hash algorithm that is constructed from the MD5 hash function and used as a Hash-based Message Authentication Code (HMAC). 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 128 bits in length.

This constructor uses a key you provide to create the HMACMD5 object.

For an example of how to use this constructor, see the HMACMD5 class.

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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