md5.pl

/*  Part of SWI-Prolog

    Author:        Jan Wielemaker
    E-mail:        J.Wielemaker@vu.nl
    WWW:           http://www.swi-prolog.org
    Copyright (c)  2015-2016, VU University Amsterdam
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*/

:- module(md5,
          [ md5_hash/3                  % +Input, -Hash, +Options
          ]).

:- use_foreign_library(foreign(md54pl)).

/** <module> MD5 hashes

Compute MD5 hashes  from  a  Prolog   string.  This  library  provides a
lightweight alternative to the general secure hash interface provided by
library(crypto) from the `ssl` package.

@see library(sha), library(hash_stream) and library(crypto).
*/

%!  md5_hash(+Data, -Hash, +Options) is det.
%
%   Hash is the MD5 hash of Data,   The  conversion is controlled by
%   Options:
%
%     * encoding(+Encoding)
%     If Data is a sequence of character _codes_, this must be
%     translated into a sequence of _bytes_, because that is what
%     the hashing requires.  The default encoding is =utf8=.  The
%     other meaningful value is =octet=, claiming that Data contains
%     raw bytes.
%
%   @arg Data is either an atom, string, code-list or char-list.
%   @arg Hash is an atom holding 32 characters, representing the
%   hash in hexadecimal notation

:- multifile sandbox:safe_primitive/1.

sandbox:safe_primitive(md5:md5_hash(_,_,_)).