linux/crypto/cts.c

/*
 * CTS: Cipher Text Stealing mode
 *
 * COPYRIGHT (c) 2008
 * The Regents of the University of Michigan
 * ALL RIGHTS RESERVED
 *
 * Permission is granted to use, copy, create derivative works
 * and redistribute this software and such derivative works
 * for any purpose, so long as the name of The University of
 * Michigan is not used in any advertising or publicity
 * pertaining to the use of distribution of this software
 * without specific, written prior authorization.  If the
 * above copyright notice or any other identification of the
 * University of Michigan is included in any copy of any
 * portion of this software, then the disclaimer below must
 * also be included.
 *
 * THIS SOFTWARE IS PROVIDED AS IS, WITHOUT REPRESENTATION
 * FROM THE UNIVERSITY OF MICHIGAN AS TO ITS FITNESS FOR ANY
 * PURPOSE, AND WITHOUT WARRANTY BY THE UNIVERSITY OF
 * MICHIGAN OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING
 * WITHOUT LIMITATION THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE
 * REGENTS OF THE UNIVERSITY OF MICHIGAN SHALL NOT BE LIABLE
 * FOR ANY DAMAGES, INCLUDING SPECIAL, INDIRECT, INCIDENTAL, OR
 * CONSEQUENTIAL DAMAGES, WITH RESPECT TO ANY CLAIM ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OF THE SOFTWARE, EVEN
 * IF IT HAS BEEN OR IS HEREAFTER ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGES.
 */

/* Derived from various:
 *	Copyright (c) 2006 Herbert Xu <[email protected]>
 */

/*
 * This is the Cipher Text Stealing mode as described by
 * Section 8 of rfc2040 and referenced by rfc3962.
 * rfc3962 includes errata information in its Appendix A.
 */

#include <crypto/algapi.h>
#include <crypto/internal/skcipher.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/log2.h>
#include <linux/module.h>
#include <linux/scatterlist.h>
#include <crypto/scatterwalk.h>
#include <linux/slab.h>
#include <linux/compiler.h>

struct crypto_cts_ctx { … };

struct crypto_cts_reqctx { … };

static inline u8 *crypto_cts_reqctx_space(struct skcipher_request *req)
{ … }

static int crypto_cts_setkey(struct crypto_skcipher *parent, const u8 *key,
			     unsigned int keylen)
{ … }

static void cts_cbc_crypt_done(void *data, int err)
{ … }

static int cts_cbc_encrypt(struct skcipher_request *req)
{ … }

static void crypto_cts_encrypt_done(void *data, int err)
{ … }

static int crypto_cts_encrypt(struct skcipher_request *req)
{ … }

static int cts_cbc_decrypt(struct skcipher_request *req)
{ … }

static void crypto_cts_decrypt_done(void *data, int err)
{ … }

static int crypto_cts_decrypt(struct skcipher_request *req)
{ … }

static int crypto_cts_init_tfm(struct crypto_skcipher *tfm)
{ … }

static void crypto_cts_exit_tfm(struct crypto_skcipher *tfm)
{ … }

static void crypto_cts_free(struct skcipher_instance *inst)
{ … }

static int crypto_cts_create(struct crypto_template *tmpl, struct rtattr **tb)
{ … }

static struct crypto_template crypto_cts_tmpl = …;

static int __init crypto_cts_module_init(void)
{ … }

static void __exit crypto_cts_module_exit(void)
{ … }

subsys_initcall(crypto_cts_module_init);
module_exit(crypto_cts_module_exit);

MODULE_LICENSE(…) …;
MODULE_DESCRIPTION(…) …;
MODULE_ALIAS_CRYPTO(…) …;