1 files changed, 50 insertions, 0 deletions
diff --git a/nix/libutil/gcrypt-hash.cc b/nix/libutil/gcrypt-hash.cc
new file mode 100644
index 0000000000..de7e5afc1a
--- /dev/null
+++ b/nix/libutil/gcrypt-hash.cc
@@ -0,0 +1,50 @@
+/* Guix --- Nix package management from Guile.         -*- coding: utf-8 -*-
+   Copyright (C) 2012  Ludovic Courtès <ludo@gnu.org>
+
+   This file is part of Guix.
+
+   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.
+
+   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 Guix.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+#include <gcrypt-hash.hh>
+#include <assert.h>
+
+extern "C" {
+
+void
+guix_hash_init (struct guix_hash_context *ctx, gcry_md_algo_t algo)
+{
+  gcry_error_t err;
+
+  err = gcry_md_open (&ctx->md_handle, algo, 0);
+  assert (err == GPG_ERR_NO_ERROR);
+}
+
+void
+guix_hash_update (struct guix_hash_context *ctx, const void *buffer, size_t len)
+{
+  gcry_md_write (ctx->md_handle, buffer, len);
+}
+
+void
+guix_hash_final (void *resbuf, struct guix_hash_context *ctx,
+		 gcry_md_algo_t algo)
+{
+  memcpy (resbuf, gcry_md_read (ctx->md_handle, algo),
+	  gcry_md_get_algo_dlen (algo));
+  gcry_md_close (ctx->md_handle);
+}
+
+}