/* GNU Guix --- Functional package management for GNU
   Copyright (C) 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/>.  */

#include <config.h>

#include <gcrypt-hash.hh>
#include <assert.h>

extern "C" {

void
guix_hash_init (struct guix_hash_context *ctx, int 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,
		 int algo)
{
  memcpy (resbuf, gcry_md_read (ctx->md_handle, algo),
	  gcry_md_get_algo_dlen (algo));
  gcry_md_close (ctx->md_handle);
  ctx->md_handle = NULL;
}

}
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