HMACMD5 Constructor (array<Byte>^)


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

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

	array<unsigned char>^ key


Type: array<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.

Exception Condition

The key parameter is null.

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
Available since 2.0
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