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crypto: cfb,ofb - Remove cfb and ofb 

Remove the unused algorithms CFB/OFB.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2023-11-30 20:25:02 +08:00
parent d4bd210247
commit 412ac51ce0
4 changed files with 0 additions and 385 deletions
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23
crypto/Kconfig
View File

@ -661,15 +661,6 @@ config CRYPTO_CBC
This block cipher mode is required for IPSec ESP (XFRM_ESP).
config CRYPTO_CFB
tristate "CFB (Cipher Feedback)"
select CRYPTO_SKCIPHER
select CRYPTO_MANAGER
help
CFB (Cipher Feedback) mode (NIST SP800-38A)
This block cipher mode is required for TPM2 Cryptography.
config CRYPTO_CTR
tristate "CTR (Counter)"
select CRYPTO_SKCIPHER
@ -735,20 +726,6 @@ config CRYPTO_LRW
See https://people.csail.mit.edu/rivest/pubs/LRW02.pdf
config CRYPTO_OFB
tristate "OFB (Output Feedback)"
select CRYPTO_SKCIPHER
select CRYPTO_MANAGER
help
OFB (Output Feedback) mode (NIST SP800-38A)
This mode makes a block cipher into a synchronous
stream cipher. It generates keystream blocks, which are then XORed
with the plaintext blocks to get the ciphertext. Flipping a bit in the
ciphertext produces a flipped bit in the plaintext at the same
location. This property allows many error correcting codes to function
normally even when applied before encryption.
config CRYPTO_PCBC
tristate "PCBC (Propagating Cipher Block Chaining)"
select CRYPTO_SKCIPHER

2
crypto/Makefile
View File

@ -92,7 +92,6 @@ obj-$(CONFIG_CRYPTO_BLAKE2B) += blake2b_generic.o
CFLAGS_blake2b_generic.o := -Wframe-larger-than=4096 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105930
obj-$(CONFIG_CRYPTO_ECB) += ecb.o
obj-$(CONFIG_CRYPTO_CBC) += cbc.o
obj-$(CONFIG_CRYPTO_CFB) += cfb.o
obj-$(CONFIG_CRYPTO_PCBC) += pcbc.o
obj-$(CONFIG_CRYPTO_CTS) += cts.o
obj-$(CONFIG_CRYPTO_LRW) += lrw.o
@ -186,7 +185,6 @@ obj-$(CONFIG_CRYPTO_USER_API_SKCIPHER) += algif_skcipher.o
obj-$(CONFIG_CRYPTO_USER_API_RNG) += algif_rng.o
obj-$(CONFIG_CRYPTO_USER_API_AEAD) += algif_aead.o
obj-$(CONFIG_CRYPTO_ZSTD) += zstd.o
obj-$(CONFIG_CRYPTO_OFB) += ofb.o
obj-$(CONFIG_CRYPTO_ECC) += ecc.o
obj-$(CONFIG_CRYPTO_ESSIV) += essiv.o
obj-$(CONFIG_CRYPTO_CURVE25519) += curve25519-generic.o

254
crypto/cfb.c
View File

@ -1,254 +0,0 @@
// SPDX-License-Identifier: GPL-2.0
/*
* CFB: Cipher FeedBack mode
*
* Copyright (c) 2018 James.Bottomley@HansenPartnership.com
*
* CFB is a stream cipher mode which is layered on to a block
* encryption scheme. It works very much like a one time pad where
* the pad is generated initially from the encrypted IV and then
* subsequently from the encrypted previous block of ciphertext. The
* pad is XOR'd into the plain text to get the final ciphertext.
*
* The scheme of CFB is best described by wikipedia:
*
* https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#CFB
*
* Note that since the pad for both encryption and decryption is
* generated by an encryption operation, CFB never uses the block
* decryption function.
*/
#include <crypto/algapi.h>
#include <crypto/internal/cipher.h>
#include <crypto/internal/skcipher.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/string.h>
static unsigned int crypto_cfb_bsize(struct crypto_skcipher *tfm)
{
return crypto_cipher_blocksize(skcipher_cipher_simple(tfm));
}
static void crypto_cfb_encrypt_one(struct crypto_skcipher *tfm,
const u8 *src, u8 *dst)
{
crypto_cipher_encrypt_one(skcipher_cipher_simple(tfm), dst, src);
}
/* final encrypt and decrypt is the same */
static void crypto_cfb_final(struct skcipher_walk *walk,
struct crypto_skcipher *tfm)
{
const unsigned long alignmask = crypto_skcipher_alignmask(tfm);
u8 tmp[MAX_CIPHER_BLOCKSIZE + MAX_CIPHER_ALIGNMASK];
u8 *stream = PTR_ALIGN(tmp + 0, alignmask + 1);
u8 *src = walk->src.virt.addr;
u8 *dst = walk->dst.virt.addr;
u8 *iv = walk->iv;
unsigned int nbytes = walk->nbytes;
crypto_cfb_encrypt_one(tfm, iv, stream);
crypto_xor_cpy(dst, stream, src, nbytes);
}
static int crypto_cfb_encrypt_segment(struct skcipher_walk *walk,
struct crypto_skcipher *tfm)
{
const unsigned int bsize = crypto_cfb_bsize(tfm);
unsigned int nbytes = walk->nbytes;
u8 *src = walk->src.virt.addr;
u8 *dst = walk->dst.virt.addr;
u8 *iv = walk->iv;
do {
crypto_cfb_encrypt_one(tfm, iv, dst);
crypto_xor(dst, src, bsize);
iv = dst;
src += bsize;
dst += bsize;
} while ((nbytes -= bsize) >= bsize);
memcpy(walk->iv, iv, bsize);
return nbytes;
}
static int crypto_cfb_encrypt_inplace(struct skcipher_walk *walk,
struct crypto_skcipher *tfm)
{
const unsigned int bsize = crypto_cfb_bsize(tfm);
unsigned int nbytes = walk->nbytes;
u8 *src = walk->src.virt.addr;
u8 *iv = walk->iv;
u8 tmp[MAX_CIPHER_BLOCKSIZE];
do {
crypto_cfb_encrypt_one(tfm, iv, tmp);
crypto_xor(src, tmp, bsize);
iv = src;
src += bsize;
} while ((nbytes -= bsize) >= bsize);
memcpy(walk->iv, iv, bsize);
return nbytes;
}
static int crypto_cfb_encrypt(struct skcipher_request *req)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct skcipher_walk walk;
unsigned int bsize = crypto_cfb_bsize(tfm);
int err;
err = skcipher_walk_virt(&walk, req, false);
while (walk.nbytes >= bsize) {
if (walk.src.virt.addr == walk.dst.virt.addr)
err = crypto_cfb_encrypt_inplace(&walk, tfm);
else
err = crypto_cfb_encrypt_segment(&walk, tfm);
err = skcipher_walk_done(&walk, err);
}
if (walk.nbytes) {
crypto_cfb_final(&walk, tfm);
err = skcipher_walk_done(&walk, 0);
}
return err;
}
static int crypto_cfb_decrypt_segment(struct skcipher_walk *walk,
struct crypto_skcipher *tfm)
{
const unsigned int bsize = crypto_cfb_bsize(tfm);
unsigned int nbytes = walk->nbytes;
u8 *src = walk->src.virt.addr;
u8 *dst = walk->dst.virt.addr;
u8 *iv = walk->iv;
do {
crypto_cfb_encrypt_one(tfm, iv, dst);
crypto_xor(dst, src, bsize);
iv = src;
src += bsize;
dst += bsize;
} while ((nbytes -= bsize) >= bsize);
memcpy(walk->iv, iv, bsize);
return nbytes;
}
static int crypto_cfb_decrypt_inplace(struct skcipher_walk *walk,
struct crypto_skcipher *tfm)
{
const unsigned int bsize = crypto_cfb_bsize(tfm);
unsigned int nbytes = walk->nbytes;
u8 *src = walk->src.virt.addr;
u8 * const iv = walk->iv;
u8 tmp[MAX_CIPHER_BLOCKSIZE];
do {
crypto_cfb_encrypt_one(tfm, iv, tmp);
memcpy(iv, src, bsize);
crypto_xor(src, tmp, bsize);
src += bsize;
} while ((nbytes -= bsize) >= bsize);
return nbytes;
}
static int crypto_cfb_decrypt_blocks(struct skcipher_walk *walk,
struct crypto_skcipher *tfm)
{
if (walk->src.virt.addr == walk->dst.virt.addr)
return crypto_cfb_decrypt_inplace(walk, tfm);
else
return crypto_cfb_decrypt_segment(walk, tfm);
}
static int crypto_cfb_decrypt(struct skcipher_request *req)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct skcipher_walk walk;
const unsigned int bsize = crypto_cfb_bsize(tfm);
int err;
err = skcipher_walk_virt(&walk, req, false);
while (walk.nbytes >= bsize) {
err = crypto_cfb_decrypt_blocks(&walk, tfm);
err = skcipher_walk_done(&walk, err);
}
if (walk.nbytes) {
crypto_cfb_final(&walk, tfm);
err = skcipher_walk_done(&walk, 0);
}
return err;
}
static int crypto_cfb_create(struct crypto_template *tmpl, struct rtattr **tb)
{
struct skcipher_instance *inst;
struct crypto_alg *alg;
int err;
inst = skcipher_alloc_instance_simple(tmpl, tb);
if (IS_ERR(inst))
return PTR_ERR(inst);
alg = skcipher_ialg_simple(inst);
/* CFB mode is a stream cipher. */
inst->alg.base.cra_blocksize = 1;
/*
* To simplify the implementation, configure the skcipher walk to only
* give a partial block at the very end, never earlier.
*/
inst->alg.chunksize = alg->cra_blocksize;
inst->alg.encrypt = crypto_cfb_encrypt;
inst->alg.decrypt = crypto_cfb_decrypt;
err = skcipher_register_instance(tmpl, inst);
if (err)
inst->free(inst);
return err;
}
static struct crypto_template crypto_cfb_tmpl = {
.name = "cfb",
.create = crypto_cfb_create,
.module = THIS_MODULE,
};
static int __init crypto_cfb_module_init(void)
{
return crypto_register_template(&crypto_cfb_tmpl);
}
static void __exit crypto_cfb_module_exit(void)
{
crypto_unregister_template(&crypto_cfb_tmpl);
}
subsys_initcall(crypto_cfb_module_init);
module_exit(crypto_cfb_module_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("CFB block cipher mode of operation");
MODULE_ALIAS_CRYPTO("cfb");
MODULE_IMPORT_NS(CRYPTO_INTERNAL);

106
crypto/ofb.c
View File

@ -1,106 +0,0 @@
// SPDX-License-Identifier: GPL-2.0
/*
* OFB: Output FeedBack mode
*
* Copyright (C) 2018 ARM Limited or its affiliates.
* All rights reserved.
*/
#include <crypto/algapi.h>
#include <crypto/internal/cipher.h>
#include <crypto/internal/skcipher.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
static int crypto_ofb_crypt(struct skcipher_request *req)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct crypto_cipher *cipher = skcipher_cipher_simple(tfm);
const unsigned int bsize = crypto_cipher_blocksize(cipher);
struct skcipher_walk walk;
int err;
err = skcipher_walk_virt(&walk, req, false);
while (walk.nbytes >= bsize) {
const u8 *src = walk.src.virt.addr;
u8 *dst = walk.dst.virt.addr;
u8 * const iv = walk.iv;
unsigned int nbytes = walk.nbytes;
do {
crypto_cipher_encrypt_one(cipher, iv, iv);
crypto_xor_cpy(dst, src, iv, bsize);
dst += bsize;
src += bsize;
} while ((nbytes -= bsize) >= bsize);
err = skcipher_walk_done(&walk, nbytes);
}
if (walk.nbytes) {
crypto_cipher_encrypt_one(cipher, walk.iv, walk.iv);
crypto_xor_cpy(walk.dst.virt.addr, walk.src.virt.addr, walk.iv,
walk.nbytes);
err = skcipher_walk_done(&walk, 0);
}
return err;
}
static int crypto_ofb_create(struct crypto_template *tmpl, struct rtattr **tb)
{
struct skcipher_instance *inst;
struct crypto_alg *alg;
int err;
inst = skcipher_alloc_instance_simple(tmpl, tb);
if (IS_ERR(inst))
return PTR_ERR(inst);
alg = skcipher_ialg_simple(inst);
/* OFB mode is a stream cipher. */
inst->alg.base.cra_blocksize = 1;
/*
* To simplify the implementation, configure the skcipher walk to only
* give a partial block at the very end, never earlier.
*/
inst->alg.chunksize = alg->cra_blocksize;
inst->alg.encrypt = crypto_ofb_crypt;
inst->alg.decrypt = crypto_ofb_crypt;
err = skcipher_register_instance(tmpl, inst);
if (err)
inst->free(inst);
return err;
}
static struct crypto_template crypto_ofb_tmpl = {
.name = "ofb",
.create = crypto_ofb_create,
.module = THIS_MODULE,
};
static int __init crypto_ofb_module_init(void)
{
return crypto_register_template(&crypto_ofb_tmpl);
}
static void __exit crypto_ofb_module_exit(void)
{
crypto_unregister_template(&crypto_ofb_tmpl);
}
subsys_initcall(crypto_ofb_module_init);
module_exit(crypto_ofb_module_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("OFB block cipher mode of operation");
MODULE_ALIAS_CRYPTO("ofb");
MODULE_IMPORT_NS(CRYPTO_INTERNAL);