diff options
| -rw-r--r-- | Kbuild.in | 2 | ||||
| -rw-r--r-- | cryptoloop.c | 216 |
2 files changed, 0 insertions, 218 deletions
@@ -3,8 +3,6 @@ obj-$(CONFIG_BLK_DEV_LOOP) += xloop.o xloop-objs += loop_main.o loop_file_fmt.o -obj-$(CONFIG_BLK_DEV_CRYPTOLOOP) += cryptoloop.o - obj-$(CONFIG_BLK_DEV_LOOP_FILE_FMT_RAW) += loop_file_fmt_raw.o loop_file_fmt_qcow-y += loop_file_fmt_qcow_main.o loop_file_fmt_qcow_cluster.o loop_file_fmt_qcow_cache.o diff --git a/cryptoloop.c b/cryptoloop.c deleted file mode 100644 index bb185af..0000000 --- a/cryptoloop.c +++ /dev/null @@ -1,216 +0,0 @@ -/* - 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_main.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 *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_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; -} - - -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; -} - -static int -cryptoloop_ioctl(struct loop_device *lo, int cmd, unsigned long arg) -{ - return -EINVAL; -} - -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; -} - -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 = xloop_register_transfer(&cryptoloop_funcs); - - if (rc) - printk(KERN_ERR "cryptoloop: xloop_register_transfer failed\n"); - return rc; -} - -static void __exit -cleanup_cryptoloop(void) -{ - if (xloop_unregister_transfer(LO_CRYPT_CRYPTOAPI)) - printk(KERN_ERR - "cryptoloop: xloop_unregister_transfer failed\n"); -} - -module_init(init_cryptoloop); -module_exit(cleanup_cryptoloop); |