class HexaPDF::DigitalSignature::Signature::SignatureReference

See: PDF2.0 s12.8.1, HexaPDF::DigitalSignature::Signature
Represents a signature reference dictionary.

def perform_validation #:nodoc:

:nodoc: 
def perform_validation #:nodoc:
  super
  if self[:TransformMethod] == :FieldMDP && !key?(:Data)
    yield("Field /Data is required when /TransformMethod is /FieldMDP")
  end
end