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https://gitlab.com/cryptsetup/cryptsetup.git
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68 lines
1.7 KiB
C
68 lines
1.7 KiB
C
/*
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* cryptsetup volume key implementation
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*
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* Copyright (C) 2004-2006, Clemens Fruhwirth <clemens@endorphin.org>
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* Copyright (C) 2010-2012, Red Hat, Inc. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of 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,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <string.h>
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#include <stdlib.h>
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#include "internal.h"
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struct volume_key *crypt_alloc_volume_key(unsigned keylength, const char *key)
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{
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struct volume_key *vk = malloc(sizeof(*vk) + keylength);
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if (!vk)
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return NULL;
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vk->keylength = keylength;
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if (key)
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memcpy(&vk->key, key, keylength);
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else
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memset(&vk->key, 0, keylength);
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return vk;
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}
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void crypt_free_volume_key(struct volume_key *vk)
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{
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if (vk) {
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memset(vk->key, 0, vk->keylength);
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vk->keylength = 0;
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free(vk);
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}
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}
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struct volume_key *crypt_generate_volume_key(struct crypt_device *cd, unsigned keylength)
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{
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int r;
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struct volume_key *vk;
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vk = crypt_alloc_volume_key(keylength, NULL);
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if (!vk)
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return NULL;
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r = crypt_random_get(cd, vk->key, keylength, CRYPT_RND_KEY);
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if(r < 0) {
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crypt_free_volume_key(vk);
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return NULL;
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}
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return vk;
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}
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