Release 4.12 drivers/block/cryptoloop.c
/*
Linux loop encryption enabling module
Copyright (C) 2002 Herbert Valerio Riedel <hvr@gnu.org>
Copyright (C) 2003 Fruhwirth Clemens <clemens@endorphin.org>
This module 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 module 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 module; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/module.h>
#include <crypto/skcipher.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/blkdev.h>
#include <linux/scatterlist.h>
#include <linux/uaccess.h>
#include "loop.h"
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("loop blockdevice transferfunction adaptor / CryptoAPI");
MODULE_AUTHOR("Herbert Valerio Riedel <hvr@gnu.org>");
#define LOOP_IV_SECTOR_BITS 9
#define LOOP_IV_SECTOR_SIZE (1 << LOOP_IV_SECTOR_BITS)
static int
cryptoloop_init(struct loop_device *lo, const struct loop_info64 *info)
{
int err = -EINVAL;
int cipher_len;
int mode_len;
char cms[LO_NAME_SIZE]; /* cipher-mode string */
char *cipher;
char *mode;
char *cmsp = cms; /* c-m string pointer */
struct crypto_skcipher *tfm;
/* encryption breaks for non sector aligned offsets */
if (info->lo_offset % LOOP_IV_SECTOR_SIZE)
goto out;
strncpy(cms, info->lo_crypt_name, LO_NAME_SIZE);
cms[LO_NAME_SIZE - 1] = 0;
cipher = cmsp;
cipher_len = strcspn(cmsp, "-");
mode = cmsp + cipher_len;
mode_len = 0;
if (*mode) {
mode++;
mode_len = strcspn(mode, "-");
}
if (!mode_len) {
mode = "cbc";
mode_len = 3;
}
if (cipher_len + mode_len + 3 > LO_NAME_SIZE)
return -EINVAL;
memmove(cms, mode, mode_len);
cmsp = cms + mode_len;
*cmsp++ = '(';
memcpy(cmsp, info->lo_crypt_name, cipher_len);
cmsp += cipher_len;
*cmsp++ = ')';
*cmsp = 0;
tfm = crypto_alloc_skcipher(cms, 0, CRYPTO_ALG_ASYNC);
if (IS_ERR(tfm))
return PTR_ERR(tfm);
err = crypto_skcipher_setkey(tfm, info->lo_encrypt_key,
info->lo_encrypt_key_size);
if (err != 0)
goto out_free_tfm;
lo->key_data = tfm;
return 0;
out_free_tfm:
crypto_free_skcipher(tfm);
out:
return err;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andries E. Brouwer | 165 | 60.00% | 1 | 33.33% |
| Herbert Xu | 110 | 40.00% | 2 | 66.67% |
| Total | 275 | 100.00% | 3 | 100.00% |
typedef int (*encdec_cbc_t)(struct skcipher_request *req);
static int
cryptoloop_transfer(struct loop_device *lo, int cmd,
struct page *raw_page, unsigned raw_off,
struct page *loop_page, unsigned loop_off,
int size, sector_t IV)
{
struct crypto_skcipher *tfm = lo->key_data;
SKCIPHER_REQUEST_ON_STACK(req, tfm);
struct scatterlist sg_out;
struct scatterlist sg_in;
encdec_cbc_t encdecfunc;
struct page *in_page, *out_page;
unsigned in_offs, out_offs;
int err;
skcipher_request_set_tfm(req, tfm);
skcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_SLEEP,
NULL, NULL);
sg_init_table(&sg_out, 1);
sg_init_table(&sg_in, 1);
if (cmd == READ) {
in_page = raw_page;
in_offs = raw_off;
out_page = loop_page;
out_offs = loop_off;
encdecfunc = crypto_skcipher_decrypt;
} else {
in_page = loop_page;
in_offs = loop_off;
out_page = raw_page;
out_offs = raw_off;
encdecfunc = crypto_skcipher_encrypt;
}
while (size > 0) {
const int sz = min(size, LOOP_IV_SECTOR_SIZE);
u32 iv[4] = { 0, };
iv[0] = cpu_to_le32(IV & 0xffffffff);
sg_set_page(&sg_in, in_page, sz, in_offs);
sg_set_page(&sg_out, out_page, sz, out_offs);
skcipher_request_set_crypt(req, &sg_in, &sg_out, sz, iv);
err = encdecfunc(req);
if (err)
goto out;
IV++;
size -= sz;
in_offs += sz;
out_offs += sz;
}
err = 0;
out:
skcipher_request_zero(req);
return err;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Fruhwirth Clemens | 114 | 39.72% | 1 | 16.67% |
| Herbert Xu | 91 | 31.71% | 2 | 33.33% |
| Andrew Morton | 50 | 17.42% | 1 | 16.67% |
| Jens Axboe | 32 | 11.15% | 2 | 33.33% |
| Total | 287 | 100.00% | 6 | 100.00% |
static int
cryptoloop_ioctl(struct loop_device *lo, int cmd, unsigned long arg)
{
return -EINVAL;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Herbert Xu | 14 | 63.64% | 1 | 33.33% |
| Andries E. Brouwer | 7 | 31.82% | 1 | 33.33% |
| Fruhwirth Clemens | 1 | 4.55% | 1 | 33.33% |
| Total | 22 | 100.00% | 3 | 100.00% |
static int
cryptoloop_release(struct loop_device *lo)
{
struct crypto_skcipher *tfm = lo->key_data;
if (tfm != NULL) {
crypto_free_skcipher(tfm);
lo->key_data = NULL;
return 0;
}
printk(KERN_ERR "cryptoloop_release(): tfm == NULL?\n");
return -EINVAL;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andries E. Brouwer | 49 | 94.23% | 1 | 33.33% |
| Herbert Xu | 3 | 5.77% | 2 | 66.67% |
| Total | 52 | 100.00% | 3 | 100.00% |
static struct loop_func_table cryptoloop_funcs = {
.number = LO_CRYPT_CRYPTOAPI,
.init = cryptoloop_init,
.ioctl = cryptoloop_ioctl,
.transfer = cryptoloop_transfer,
.release = cryptoloop_release,
.owner = THIS_MODULE
};
static int __init
init_cryptoloop(void)
{
int rc = loop_register_transfer(&cryptoloop_funcs);
if (rc)
printk(KERN_ERR "cryptoloop: loop_register_transfer failed\n");
return rc;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andries E. Brouwer | 31 | 100.00% | 1 | 100.00% |
| Total | 31 | 100.00% | 1 | 100.00% |
static void __exit
cleanup_cryptoloop(void)
{
if (loop_unregister_transfer(LO_CRYPT_CRYPTOAPI))
printk(KERN_ERR
"cryptoloop: loop_unregister_transfer failed\n");
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andries E. Brouwer | 22 | 100.00% | 1 | 100.00% |
| Total | 22 | 100.00% | 1 | 100.00% |
module_init(init_cryptoloop);
module_exit(cleanup_cryptoloop);
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andries E. Brouwer | 365 | 45.80% | 1 | 11.11% |
| Herbert Xu | 224 | 28.11% | 2 | 22.22% |
| Fruhwirth Clemens | 121 | 15.18% | 1 | 11.11% |
| Andrew Morton | 50 | 6.27% | 1 | 11.11% |
| Jens Axboe | 34 | 4.27% | 2 | 22.22% |
| Al Viro | 2 | 0.25% | 1 | 11.11% |
| Linus Torvalds | 1 | 0.13% | 1 | 11.11% |
| Total | 797 | 100.00% | 9 | 100.00% |
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