50 lines
1.6 KiB
Scheme
50 lines
1.6 KiB
Scheme
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;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2012, 2013 Ludovic Courtès <ludo@gnu.org>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (guix hash)
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#:use-module (guix config)
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#:use-module (rnrs bytevectors)
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#:use-module (system foreign)
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#:export (sha256))
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;;; Commentary:
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;;;
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;;; Cryptographic hashes.
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;;;
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;;; Code:
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;;;
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;;; Hash.
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;;;
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(define sha256
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(let ((hash (pointer->procedure void
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(dynamic-func "gcry_md_hash_buffer"
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(dynamic-link %libgcrypt))
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`(,int * * ,size_t)))
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(sha256 8)) ; GCRY_MD_SHA256, as of 1.5.0
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(lambda (bv)
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"Return the SHA256 of BV as a bytevector."
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(let ((digest (make-bytevector (/ 256 8))))
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(hash sha256 (bytevector->pointer digest)
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(bytevector->pointer bv) (bytevector-length bv))
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digest))))
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;;; hash.scm ends here
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