;;;; sha256-primitive.scm  -*- Scheme -*-
;;;; Kon Lovett, Jul '18

(module sha256-primitive

(;export
  sha256-primitive)

(import scheme
  (chicken base)
  (chicken type)
  message-digest-primitive
  sha256-api)

(: sha256-primitive (-> (struct message-digest-primitive)))

(define sha256-primitive
  (let ((the-sha256-primitive (the (or false (struct message-digest-primitive)) #f)))
    (lambda ()
      (unless the-sha256-primitive
        (set! the-sha256-primitive (make-message-digest-primitive
          context-size digest-length init update final
          #:block-length block-length #:raw-update raw-update #:name name)) )
      the-sha256-primitive ) ) )

) ;module sha256-primitive