FunctionPackage: exclToCDocOverviewCGDocRelNotesFAQIndexPermutedIndex
Allegro CL version 10.1
Unrevised from 10.0 to 10.1.
10.0 version


Arguments: context &key return

Finalize and return the SHA384 hash from context in a format determined by the return keyword argument.

return can be one of the following values:

cl-user(4): (setq c (sha384-init))
#S(excl::md-context :ctx 9183040 :size 48)
cl-user(5): (sha384-update c "foo")
cl-user(6): (sha384-final c :return :usb8)
#(152 193 31 253 253 213 64 103 107 26 ...)

;;  Potential problem with :return :integer (or :return unspecified
;;  as the default is :integer). The call is to SHA384-FILE which calls
;;  SHA384-FINAL and returns the value SHA384-FINAL returns.
;;  Here we get the sha384 value in a shell:
% openssl dgst -sha384 -hex alpha7.png 
SHA384(xmldoc/html101/pictures/alpha7.png)= 050636aaa2227c310baf6bd61ad776ee570e5397c34bbcfc70e77c64732f77815014ea901e82295680cf1884aceaa58c

;; Now we get it with SHA384-FILE:
cl-user(17): (sha384-file "~/alpha7.png")
cl-user(18): (format t "~x" *)

;; Note the hex values are the same but the leading 0 is not printed
;; by Lisp, which is dealing with the value as an integer. The leading
;; 0 is preserved when the :return is :hex:
cl-user(21): (sha384-file "~/alpha7.png" :return :hex)

See MD*, SHA*, HMAC, and other message digest support in miscellaneous.htm. See also digest-final.

Copyright (c) 1998-2022, Franz Inc. Lafayette, CA., USA. All rights reserved.
This page was not revised from the 10.0 page.
Created 2019.8.20.

Allegro CL version 10.1
Unrevised from 10.0 to 10.1.
10.0 version