%%/+
%%- Name: SisuDoc Spine, Doc Reform [a part of]
%%  - Description: documents, structuring, processing, publishing, search
%%    - static content generator
%%
%%  - Author: Ralph Amissah
%%    [ralph.amissah@gmail.com]
%%
%%  - Copyright: (C) 2015 (continuously updated, current 2026) Ralph Amissah, All Rights Reserved.
%%
%%  - License: AGPL 3 or later:
%%
%%    Spine (SiSU), a framework for document structuring, publishing and
%%    search
%%
%%    Copyright (C) Ralph Amissah
%%
%%    This program is free software: you can redistribute it and/or modify it
%%    under the terms of the GNU AFERO General Public License as published by the
%%    Free Software Foundation, either version 3 of the License, or (at your
%%    option) any later version.
%%
%%    This program is distributed in the hope that it will be useful, but WITHOUT
%%    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
%%    FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
%%    more details.
%%
%%    You should have received a copy of the GNU General Public License along with
%%    this program. If not, see [https://www.gnu.org/licenses/].
%%
%%    If you have Internet connection, the latest version of the AGPL should be
%%    available at these locations:
%%    [https://www.fsf.org/licensing/licenses/agpl.html]
%%    [https://www.gnu.org/licenses/agpl.html]
%%
%%  - Spine (by Doc Reform, related to SiSU) uses standard:
%%    - docReform markup syntax
%%      - standard SiSU markup syntax with modified headers and minor modifications
%%    - docReform object numbering
%%      - standard SiSU object citation numbering & system
%%
%%  - Homepages:
%%    [https://www.sisudoc.org]
%%    [https://www.doc-reform.org]
%%
%%  - Git
%%    [https://git.sisudoc.org/]
%%
%%+/
%% The one thing ocda-lib asks of Erlang directly: a sha256, which OTP's
%% crypto has and the Gleam standard library does not. Upper case hex, as
%% the database stores it and the D library writes it.
-module(ocda_ffi).
-export([sha256_hex/1]).

sha256_hex(Bin) -> binary:encode_hex(crypto:hash(sha256, Bin)).