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;; This file is part of scheme-GNUnet, a partial Scheme port of GNUnet.
;; Copyright (C) 2001--2013, 2020 GNUnet e.V.
;;
;; GNUnet is free software: you can redistribute it and/or modify it
;; under the terms of the GNU Affero General Public License as published
;; by the Free Software Foundation, either version 3 of the License,
;; or (at your option) any later version.
;;
;; GNUnet 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
;; Affero General Public License for more details.
;;
;; You should have received a copy of the GNU Affero General Public License
;; along with this program. If not, see <http://www.gnu.org/licenses/>.
;;
;; SPDX-License-Identifier: AGPL-3.0-or-later
;;
;; As a special exception to the GNU Affero General Public License,
;; the file may be relicensed under any license used for
;; most source code of GNUnet 0.13.1, or later versions, as published by
;; GNUnet e.V.
;; Extracted from src/util/crypto_hash.c by Christian Grothoff
(library (gnu gnunet hashcode-ascii (1 1))
(export hashcode->ascii ascii->hashcode
#; hashcode-ascii-length)
(import (gnu gnunet hashcode)
(gnu gnunet data-string)
(rnrs base))
;; In upstream, this is 104 for the \0 terminator
#;(define hashcode-ascii-length 103)
(define (hashcode->ascii hashcode)
"Convert a <hashcode> to ASCII encoding. The ASCII encoding is rather
GNUnet specific. It was chosen such that it only uses characters
in [0-9A-V], can be produced without complex arithmetics and uses a
small number of characters. The GNUnet encoding uses 103
characters.
@var{block} the hash code"
(data->string (hashcode->bv hashcode)))
(define (ascii->hashcode ascii)
"Convert ASCII encoding back to hash code.
@var{ascii} the encoding
Return @lisp{#f} in case of an encoding error."
(let ((bv (string->data ascii hashcode-u8-length)))
(and bv (bv->hashcode bv)))))
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