CanReuseTransform (get) CanTransformMultipleBlocks (get) Hash (get) HashName (get) HashName (let) HashSize (get) InputBlockSize (get) Key (get) Key (let) OutputBlockSize (get)| HMACSHA256 |
| HashAlgorithm | |
| HMAC | |
| ICryptoTransform | |
| IObject | |
| KeyedHashAlgorithm |
| Name | Description |
|---|---|
| CanReuseTransform (get) | Returns if this service provider can be reused to transfrom more data. |
| CanTransformMultipleBlocks (get) | Returns if this transform can operate on multiple blocks at once. |
| Hash (get) | Returns the computed hash. |
| HashName (get) | Returns the name of the hash. |
| HashName (let) | Sets the name of the hash. |
| HashSize (get) | Returns the size of the computed hash. |
| InputBlockSize (get) | Returns the size of the input block size allowed. |
| Key (get) | Returns the key being used by the hash. |
| Key (let) | Sets the key to be used by the hash. |
| OutputBlockSize (get) | Returns the output block size this transform can produce. |
| Name | Description |
|---|---|
 Clear | Releases any resources. |
 ComputeHash | Computes a hash value for a source in a single pass. |
| Equals | This function determines if the value passed in is the same as the current object instance. Meaning, are the Value and this object the same object in memory. |
| GetHashCode | Returns a psuedo-unique number used to help identify this object in memory. The current method is to return the value obtained from ObjPtr. If a different method needs to be impelmented then change the method here in this function. |
| Initialize | Resets the hashing algorithm to start again. |
| ToString | Returns a string representation of this object instance. The default method simply returns the application name and class name in which this class resides. |
| TransformBlock | Computes the hash for the specified block of data. |
| TransformFinalBlock | Processes the final data and retrieves the hash value. |
Information about HMAC can be found at http://csrc.nist.gov/publications/fips/fips198/fips-198a.pdf
A Hash-based Message Authentication Code can be used to determine if messages sent over insecure channels have been modified. This works by each party at boths ends sharing a secret key used to sign the sent message and to also authenticate the received message. If the key were compromised, then the authentication cannot be guaranteed.