Move `sha256' to (guix hash).

* guix/utils.scm (sha256): Move to...
* guix/hash.scm: ... here.  New file.
* Makefile.am (MODULES): Add it.
* guix/derivations.scm, guix/scripts/download.scm,
  guix/scripts/hash.scm, guix/scripts/refresh.scm, tests/base32.scm,
  tests/derivations.scm, tests/store.scm: Use (guix hash).

1 files changed, 49 insertions, 0 deletions

diff --git a/guix/hash.scm b/guix/hash.scm
new file mode 100644
index 0000000000..1c7e342803
--- /dev/null
+++ b/guix/hash.scm
@@ -0,0 +1,49 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2012, 2013 Ludovic Courtès <ludo@gnu.org>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix 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 GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (guix hash)
+  #:use-module (guix config)
+  #:use-module (rnrs bytevectors)
+  #:use-module (system foreign)
+  #:export (sha256))
+
+;;; Commentary:
+;;;
+;;; Cryptographic hashes.
+;;;
+;;; Code:
+
+
+;;;
+;;; Hash.
+;;;
+
+(define sha256
+  (let ((hash   (pointer->procedure void
+                                    (dynamic-func "gcry_md_hash_buffer"
+                                                  (dynamic-link %libgcrypt))
+                                    `(,int * * ,size_t)))
+        (sha256 8))                        ; GCRY_MD_SHA256, as of 1.5.0
+    (lambda (bv)
+      "Return the SHA256 of BV as a bytevector."
+      (let ((digest (make-bytevector (/ 256 8))))
+        (hash sha256 (bytevector->pointer digest)
+              (bytevector->pointer bv) (bytevector-length bv))
+        digest))))
+
+;;; hash.scm ends here