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125289ae45
* Update to LGPL 2.1 * Fix typos in license comments * Update FSF address https://bugzilla.gnome.org/show_bug.cgi?id=673194
111 lines
2.9 KiB
C
111 lines
2.9 KiB
C
/*
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* gnome-keyring
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*
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* Copyright (C) 2011 Collabora Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* This program 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*
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* Author: Stef Walter <stefw@collabora.co.uk>
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*/
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#include "config.h"
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#include "egg-hkdf.h"
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#include "egg-secure-memory.h"
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#include <gcrypt.h>
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#include <string.h>
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gboolean
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egg_hkdf_perform (const gchar *hash_algo, gconstpointer input, gsize n_input,
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gconstpointer salt, gsize n_salt, gconstpointer info,
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gsize n_info, gpointer output, gsize n_output)
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{
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gpointer alloc = NULL;
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gpointer buffer = NULL;
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gcry_md_hd_t md1, md2;
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guint hash_len;
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guchar i;
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gint flags, algo;
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gsize step, n_buffer;
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guchar *at;
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gcry_error_t gcry;
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algo = gcry_md_map_name (hash_algo);
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g_return_val_if_fail (algo != 0, FALSE);
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hash_len = gcry_md_get_algo_dlen (algo);
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g_return_val_if_fail (hash_len != 0, FALSE);
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g_return_val_if_fail (n_output <= 255 * hash_len, FALSE);
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/* Buffer we need to for intermediate stuff */
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if (gcry_is_secure (input)) {
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flags = GCRY_MD_FLAG_SECURE;
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buffer = gcry_malloc_secure (hash_len);
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} else {
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flags = 0;
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buffer = gcry_malloc (hash_len);
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}
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g_return_val_if_fail (buffer, FALSE);
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n_buffer = 0;
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/* Salt defaults to hash_len zeros */
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if (!salt) {
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salt = alloc = g_malloc0 (hash_len);
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n_salt = hash_len;
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}
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/* Step 1: Extract */
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gcry = gcry_md_open (&md1, algo, GCRY_MD_FLAG_HMAC | flags);
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g_return_val_if_fail (gcry == 0, FALSE);
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gcry = gcry_md_setkey (md1, salt, n_salt);
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g_return_val_if_fail (gcry == 0, FALSE);
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gcry_md_write (md1, input, n_input);
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/* Step 2: Expand */
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gcry = gcry_md_open (&md2, algo, GCRY_MD_FLAG_HMAC | flags);
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g_return_val_if_fail (gcry == 0, FALSE);
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gcry = gcry_md_setkey (md2, gcry_md_read (md1, algo), hash_len);
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g_return_val_if_fail (gcry == 0, FALSE);
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gcry_md_close (md1);
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at = output;
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for (i = 1; i < 256; ++i) {
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gcry_md_reset (md2);
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gcry_md_write (md2, buffer, n_buffer);
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gcry_md_write (md2, info, n_info);
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gcry_md_write (md2, &i, 1);
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n_buffer = hash_len;
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memcpy (buffer, gcry_md_read (md2, algo), n_buffer);
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step = MIN (n_buffer, n_output);
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memcpy (at, buffer, step);
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n_output -= step;
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at += step;
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if (!n_output)
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break;
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}
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g_free (alloc);
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gcry_free (buffer);
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gcry_md_close (md2);
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return TRUE;
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}
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