| /* |
| * cryptsetup volume key implementation |
| * |
| * Copyright (C) 2004-2006, Clemens Fruhwirth <clemens@endorphin.org> |
| * Copyright (C) 2010-2012, Red Hat, Inc. All rights reserved. |
| * |
| * This program 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 2 |
| * of the License, or (at your option) any later version. |
| * |
| * This program 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 this program; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| */ |
| |
| #include <string.h> |
| #include <stdlib.h> |
| |
| #include "internal.h" |
| |
| struct volume_key *crypt_alloc_volume_key(unsigned keylength, const char *key) |
| { |
| struct volume_key *vk = malloc(sizeof(*vk) + keylength); |
| |
| if (!vk) |
| return NULL; |
| |
| vk->keylength = keylength; |
| if (key) |
| memcpy(&vk->key, key, keylength); |
| else |
| memset(&vk->key, 0, keylength); |
| |
| return vk; |
| } |
| |
| void crypt_free_volume_key(struct volume_key *vk) |
| { |
| if (vk) { |
| memset(vk->key, 0, vk->keylength); |
| vk->keylength = 0; |
| free(vk); |
| } |
| } |
| |
| struct volume_key *crypt_generate_volume_key(struct crypt_device *cd, unsigned keylength) |
| { |
| int r; |
| struct volume_key *vk; |
| |
| vk = crypt_alloc_volume_key(keylength, NULL); |
| if (!vk) |
| return NULL; |
| |
| r = crypt_random_get(cd, vk->key, keylength, CRYPT_RND_KEY); |
| if(r < 0) { |
| crypt_free_volume_key(vk); |
| return NULL; |
| } |
| return vk; |
| } |