Checks if the specified parameters are valid for this algorithm.

  Checks if the specified parameters are valid for this algorithm.
Parameters:
- params - the algorithm-specific params (may be null)
Throws:
- InvalidAlgorithmParameterException - if the parameters are not appropriate for this digest method

Returns the MessageDigest standard algorithm name.

This method invokes the abstract marshalParams method to marshal any algorithm-specific parameters.

  Marshals the algorithm-specific parameters to an Element and appends it to the specified parent element.

  Marshals the algorithm-specific parameters to an Element and
appends it to the specified parent element.
Parameters:
- parent - the parent element to append the parameters to
- the - namespace prefix to use
Throws:
- MarshalException - if the parameters cannot be marshalled

  Unmarshals DigestMethodParameterSpec from the specified Element.

  Unmarshals DigestMethodParameterSpec from the specified
Element. Subclasses should implement this to unmarshal
the algorithm-specific parameters.
Returns: the algorithm-specific DigestMethodParameterSpec
Parameters:
- paramsElem - the Element holding the input params
Throws:
- MarshalException - if the parameters cannot be unmarshalled