mirror of
https://gitlab.com/cryptsetup/cryptsetup.git
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d04d9f336a
git-svn-id: https://cryptsetup.googlecode.com/svn/trunk@408 36d66b0a-2a48-0410-832c-cd162a569da5
95 lines
2.4 KiB
C
95 lines
2.4 KiB
C
/*
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* cryptsetup plain device helper functions
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*
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* Copyright (C) 2004 Christophe Saout <christophe@saout.de>
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* Copyright (C) 2010 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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* version 2 as published by the Free Software Foundation.
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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <string.h>
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#include <stdlib.h>
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#include <errno.h>
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#include "internal.h"
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#include "crypto_backend.h"
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static int hash(const char *hash_name, int size, char *key,
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int sizep, const char *passphrase)
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{
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struct crypt_hash *md = NULL;
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size_t slen;
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int len = crypt_hash_size(hash_name);
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int round, i;
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if (crypt_hash_init(&md, hash_name))
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return -ENOENT;
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for(round = 0; size; round++) {
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/* hack from hashalot to avoid null bytes in key */
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for(i = 0; i < round; i++)
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crypt_hash_write(md, "A", 1);
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crypt_hash_write(md, passphrase, sizep);
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if (len > size)
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len = size;
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slen = len;
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crypt_hash_final(md, key, slen);
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// FIXME: if slen != len
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key += len;
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size -= len;
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if (size)
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crypt_hash_restart(md);
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}
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crypt_hash_destroy(md);
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return 0;
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}
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int crypt_plain_hash(struct crypt_device *ctx, const char *hash_name,
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char *result, size_t size,
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const char *passphrase, size_t sizep)
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{
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char hash_name_buf[256], *s;
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size_t hlen, pad = 0;
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int r;
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if (strlen(hash_name) >= sizeof(hash_name_buf))
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return -EINVAL;
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if ((s = strchr(hash_name, ':'))) {
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strcpy(hash_name_buf, hash_name);
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hash_name_buf[s-hash_name] = '\0';
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hash_name = hash_name_buf;
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hlen = atoi(++s);
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if (hlen > size) {
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log_err(ctx, "Requested hash length (%zd) > key length (%zd)\n", hlen, size);
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return -EINVAL;
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}
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pad = size-hlen;
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size = hlen;
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}
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r = hash(hash_name, size, result, sizep, passphrase);
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if (r < 0)
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log_err(ctx, "Hash algorithm %s not supported.\n", hash_name);
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if (r == 0 && pad)
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memset(result+size, 0, pad);
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return r;
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}
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