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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* SM4 Cipher Algorithm, using ARMv8 Crypto Extensions
* as specified in
* https://tools.ietf.org/id/draft-ribose-cfrg-sm4-10.html
*
* Copyright (C) 2022, Alibaba Group.
* Copyright (C) 2022 Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
*/
#include <linux/module.h>
#include <linux/crypto.h>
#include <linux/kernel.h>
#include <linux/cpufeature.h>
#include <asm/neon.h>
#include <asm/simd.h>
#include <crypto/internal/simd.h>
#include <crypto/internal/skcipher.h>
#include <crypto/scatterwalk.h>
#include <crypto/sm4.h>
#define BYTES2BLKS(nbytes) ((nbytes) >> 4)
asmlinkage void sm4_ce_expand_key(const u8 *key, u32 *rkey_enc, u32 *rkey_dec,
const u32 *fk, const u32 *ck);
asmlinkage void sm4_ce_crypt_block(const u32 *rkey, u8 *dst, const u8 *src);
asmlinkage void sm4_ce_crypt(const u32 *rkey, u8 *dst, const u8 *src,
unsigned int nblks);
asmlinkage void sm4_ce_cbc_enc(const u32 *rkey, u8 *dst, const u8 *src,
u8 *iv, unsigned int nblocks);
asmlinkage void sm4_ce_cbc_dec(const u32 *rkey, u8 *dst, const u8 *src,
u8 *iv, unsigned int nblocks);
asmlinkage void sm4_ce_cbc_cts_enc(const u32 *rkey, u8 *dst, const u8 *src,
u8 *iv, unsigned int nbytes);
asmlinkage void sm4_ce_cbc_cts_dec(const u32 *rkey, u8 *dst, const u8 *src,
u8 *iv, unsigned int nbytes);
asmlinkage void sm4_ce_cfb_enc(const u32 *rkey, u8 *dst, const u8 *src,
u8 *iv, unsigned int nblks);
asmlinkage void sm4_ce_cfb_dec(const u32 *rkey, u8 *dst, const u8 *src,
u8 *iv, unsigned int nblks);
asmlinkage void sm4_ce_ctr_enc(const u32 *rkey, u8 *dst, const u8 *src,
u8 *iv, unsigned int nblks);
EXPORT_SYMBOL(sm4_ce_expand_key);
EXPORT_SYMBOL(sm4_ce_crypt_block);
EXPORT_SYMBOL(sm4_ce_cbc_enc);
EXPORT_SYMBOL(sm4_ce_cfb_enc);
static int sm4_setkey(struct crypto_skcipher *tfm, const u8 *key,
unsigned int key_len)
{
struct sm4_ctx *ctx = crypto_skcipher_ctx(tfm);
if (key_len != SM4_KEY_SIZE)
return -EINVAL;
kernel_neon_begin();
sm4_ce_expand_key(key, ctx->rkey_enc, ctx->rkey_dec,
crypto_sm4_fk, crypto_sm4_ck);
kernel_neon_end();
return 0;
}
static int sm4_ecb_do_crypt(struct skcipher_request *req, const u32 *rkey)
{
struct skcipher_walk walk;
unsigned int nbytes;
int err;
err = skcipher_walk_virt(&walk, req, false);
while ((nbytes = walk.nbytes) > 0) {
const u8 *src = walk.src.virt.addr;
u8 *dst = walk.dst.virt.addr;
unsigned int nblks;
kernel_neon_begin();
nblks = BYTES2BLKS(nbytes);
if (nblks) {
sm4_ce_crypt(rkey, dst, src, nblks);
nbytes -= nblks * SM4_BLOCK_SIZE;
}
kernel_neon_end();
err = skcipher_walk_done(&walk, nbytes);
}
return err;
}
static int sm4_ecb_encrypt(struct skcipher_request *req)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct sm4_ctx *ctx = crypto_skcipher_ctx(tfm);
return sm4_ecb_do_crypt(req, ctx->rkey_enc);
}
static int sm4_ecb_decrypt(struct skcipher_request *req)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct sm4_ctx *ctx = crypto_skcipher_ctx(tfm);
return sm4_ecb_do_crypt(req, ctx->rkey_dec);
}
static int sm4_cbc_crypt(struct skcipher_request *req,
struct sm4_ctx *ctx, bool encrypt)
{
struct skcipher_walk walk;
unsigned int nbytes;
int err;
err = skcipher_walk_virt(&walk, req, false);
if (err)
return err;
while ((nbytes = walk.nbytes) > 0) {
const u8 *src = walk.src.virt.addr;
u8 *dst = walk.dst.virt.addr;
unsigned int nblocks;
nblocks = nbytes / SM4_BLOCK_SIZE;
if (nblocks) {
kernel_neon_begin();
if (encrypt)
sm4_ce_cbc_enc(ctx->rkey_enc, dst, src,
walk.iv, nblocks);
else
sm4_ce_cbc_dec(ctx->rkey_dec, dst, src,
walk.iv, nblocks);
kernel_neon_end();
}
err = skcipher_walk_done(&walk, nbytes % SM4_BLOCK_SIZE);
}
return err;
}
static int sm4_cbc_encrypt(struct skcipher_request *req)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct sm4_ctx *ctx = crypto_skcipher_ctx(tfm);
return sm4_cbc_crypt(req, ctx, true);
}
static int sm4_cbc_decrypt(struct skcipher_request *req)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct sm4_ctx *ctx = crypto_skcipher_ctx(tfm);
return sm4_cbc_crypt(req, ctx, false);
}
static int sm4_cbc_cts_crypt(struct skcipher_request *req, bool encrypt)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct sm4_ctx *ctx = crypto_skcipher_ctx(tfm);
struct scatterlist *src = req->src;
struct scatterlist *dst = req->dst;
struct scatterlist sg_src[2], sg_dst[2];
struct skcipher_request subreq;
struct skcipher_walk walk;
int cbc_blocks;
int err;
if (req->cryptlen < SM4_BLOCK_SIZE)
return -EINVAL;
if (req->cryptlen == SM4_BLOCK_SIZE)
return sm4_cbc_crypt(req, ctx, encrypt);
skcipher_request_set_tfm(&subreq, tfm);
skcipher_request_set_callback(&subreq, skcipher_request_flags(req),
NULL, NULL);
/* handle the CBC cryption part */
cbc_blocks = DIV_ROUND_UP(req->cryptlen, SM4_BLOCK_SIZE) - 2;
if (cbc_blocks) {
skcipher_request_set_crypt(&subreq, src, dst,
cbc_blocks * SM4_BLOCK_SIZE,
req->iv);
err = sm4_cbc_crypt(&subreq, ctx, encrypt);
if (err)
return err;
dst = src = scatterwalk_ffwd(sg_src, src, subreq.cryptlen);
if (req->dst != req->src)
dst = scatterwalk_ffwd(sg_dst, req->dst,
subreq.cryptlen);
}
/* handle ciphertext stealing */
skcipher_request_set_crypt(&subreq, src, dst,
req->cryptlen - cbc_blocks * SM4_BLOCK_SIZE,
req->iv);
err = skcipher_walk_virt(&walk, &subreq, false);
if (err)
return err;
kernel_neon_begin();
if (encrypt)
sm4_ce_cbc_cts_enc(ctx->rkey_enc, walk.dst.virt.addr,
walk.src.virt.addr, walk.iv, walk.nbytes);
else
sm4_ce_cbc_cts_dec(ctx->rkey_dec, walk.dst.virt.addr,
walk.src.virt.addr, walk.iv, walk.nbytes);
kernel_neon_end();
return skcipher_walk_done(&walk, 0);
}
static int sm4_cbc_cts_encrypt(struct skcipher_request *req)
{
return sm4_cbc_cts_crypt(req, true);
}
static int sm4_cbc_cts_decrypt(struct skcipher_request *req)
{
return sm4_cbc_cts_crypt(req, false);
}
static int sm4_cfb_encrypt(struct skcipher_request *req)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct sm4_ctx *ctx = crypto_skcipher_ctx(tfm);
struct skcipher_walk walk;
unsigned int nbytes;
int err;
err = skcipher_walk_virt(&walk, req, false);
while ((nbytes = walk.nbytes) > 0) {
const u8 *src = walk.src.virt.addr;
u8 *dst = walk.dst.virt.addr;
unsigned int nblks;
kernel_neon_begin();
nblks = BYTES2BLKS(nbytes);
if (nblks) {
sm4_ce_cfb_enc(ctx->rkey_enc, dst, src, walk.iv, nblks);
dst += nblks * SM4_BLOCK_SIZE;
src += nblks * SM4_BLOCK_SIZE;
nbytes -= nblks * SM4_BLOCK_SIZE;
}
/* tail */
if (walk.nbytes == walk.total && nbytes > 0) {
u8 keystream[SM4_BLOCK_SIZE];
sm4_ce_crypt_block(ctx->rkey_enc, keystream, walk.iv);
crypto_xor_cpy(dst, src, keystream, nbytes);
nbytes = 0;
}
kernel_neon_end();
err = skcipher_walk_done(&walk, nbytes);
}
return err;
}
static int sm4_cfb_decrypt(struct skcipher_request *req)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct sm4_ctx *ctx = crypto_skcipher_ctx(tfm);
struct skcipher_walk walk;
unsigned int nbytes;
int err;
err = skcipher_walk_virt(&walk, req, false);
while ((nbytes = walk.nbytes) > 0) {
const u8 *src = walk.src.virt.addr;
u8 *dst = walk.dst.virt.addr;
unsigned int nblks;
kernel_neon_begin();
nblks = BYTES2BLKS(nbytes);
if (nblks) {
sm4_ce_cfb_dec(ctx->rkey_enc, dst, src, walk.iv, nblks);
dst += nblks * SM4_BLOCK_SIZE;
src += nblks * SM4_BLOCK_SIZE;
nbytes -= nblks * SM4_BLOCK_SIZE;
}
/* tail */
if (walk.nbytes == walk.total && nbytes > 0) {
u8 keystream[SM4_BLOCK_SIZE];
sm4_ce_crypt_block(ctx->rkey_enc, keystream, walk.iv);
crypto_xor_cpy(dst, src, keystream, nbytes);
nbytes = 0;
}
kernel_neon_end();
err = skcipher_walk_done(&walk, nbytes);
}
return err;
}
static int sm4_ctr_crypt(struct skcipher_request *req)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct sm4_ctx *ctx = crypto_skcipher_ctx(tfm);
struct skcipher_walk walk;
unsigned int nbytes;
int err;
err = skcipher_walk_virt(&walk, req, false);
while ((nbytes = walk.nbytes) > 0) {
const u8 *src = walk.src.virt.addr;
u8 *dst = walk.dst.virt.addr;
unsigned int nblks;
kernel_neon_begin();
nblks = BYTES2BLKS(nbytes);
if (nblks) {
sm4_ce_ctr_enc(ctx->rkey_enc, dst, src, walk.iv, nblks);
dst += nblks * SM4_BLOCK_SIZE;
src += nblks * SM4_BLOCK_SIZE;
nbytes -= nblks * SM4_BLOCK_SIZE;
}
/* tail */
if (walk.nbytes == walk.total && nbytes > 0) {
u8 keystream[SM4_BLOCK_SIZE];
sm4_ce_crypt_block(ctx->rkey_enc, keystream, walk.iv);
crypto_inc(walk.iv, SM4_BLOCK_SIZE);
crypto_xor_cpy(dst, src, keystream, nbytes);
nbytes = 0;
}
kernel_neon_end();
err = skcipher_walk_done(&walk, nbytes);
}
return err;
}
static struct skcipher_alg sm4_algs[] = {
{
.base = {
.cra_name = "ecb(sm4)",
.cra_driver_name = "ecb-sm4-ce",
.cra_priority = 400,
.cra_blocksize = SM4_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct sm4_ctx),
.cra_module = THIS_MODULE,
},
.min_keysize = SM4_KEY_SIZE,
.max_keysize = SM4_KEY_SIZE,
.setkey = sm4_setkey,
.encrypt = sm4_ecb_encrypt,
.decrypt = sm4_ecb_decrypt,
}, {
.base = {
.cra_name = "cbc(sm4)",
.cra_driver_name = "cbc-sm4-ce",
.cra_priority = 400,
.cra_blocksize = SM4_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct sm4_ctx),
.cra_module = THIS_MODULE,
},
.min_keysize = SM4_KEY_SIZE,
.max_keysize = SM4_KEY_SIZE,
.ivsize = SM4_BLOCK_SIZE,
.setkey = sm4_setkey,
.encrypt = sm4_cbc_encrypt,
.decrypt = sm4_cbc_decrypt,
}, {
.base = {
.cra_name = "cfb(sm4)",
.cra_driver_name = "cfb-sm4-ce",
.cra_priority = 400,
.cra_blocksize = 1,
.cra_ctxsize = sizeof(struct sm4_ctx),
.cra_module = THIS_MODULE,
},
.min_keysize = SM4_KEY_SIZE,
.max_keysize = SM4_KEY_SIZE,
.ivsize = SM4_BLOCK_SIZE,
.chunksize = SM4_BLOCK_SIZE,
.setkey = sm4_setkey,
.encrypt = sm4_cfb_encrypt,
.decrypt = sm4_cfb_decrypt,
}, {
.base = {
.cra_name = "ctr(sm4)",
.cra_driver_name = "ctr-sm4-ce",
.cra_priority = 400,
.cra_blocksize = 1,
.cra_ctxsize = sizeof(struct sm4_ctx),
.cra_module = THIS_MODULE,
},
.min_keysize = SM4_KEY_SIZE,
.max_keysize = SM4_KEY_SIZE,
.ivsize = SM4_BLOCK_SIZE,
.chunksize = SM4_BLOCK_SIZE,
.setkey = sm4_setkey,
.encrypt = sm4_ctr_crypt,
.decrypt = sm4_ctr_crypt,
}, {
.base = {
.cra_name = "cts(cbc(sm4))",
.cra_driver_name = "cts-cbc-sm4-ce",
.cra_priority = 400,
.cra_blocksize = SM4_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct sm4_ctx),
.cra_module = THIS_MODULE,
},
.min_keysize = SM4_KEY_SIZE,
.max_keysize = SM4_KEY_SIZE,
.ivsize = SM4_BLOCK_SIZE,
.walksize = SM4_BLOCK_SIZE * 2,
.setkey = sm4_setkey,
.encrypt = sm4_cbc_cts_encrypt,
.decrypt = sm4_cbc_cts_decrypt,
}
};
static int __init sm4_init(void)
{
return crypto_register_skciphers(sm4_algs, ARRAY_SIZE(sm4_algs));
}
static void __exit sm4_exit(void)
{
crypto_unregister_skciphers(sm4_algs, ARRAY_SIZE(sm4_algs));
}
module_cpu_feature_match(SM4, sm4_init);
module_exit(sm4_exit);
MODULE_DESCRIPTION("SM4 ECB/CBC/CFB/CTR using ARMv8 Crypto Extensions");
MODULE_ALIAS_CRYPTO("sm4-ce");
MODULE_ALIAS_CRYPTO("sm4");
MODULE_ALIAS_CRYPTO("ecb(sm4)");
MODULE_ALIAS_CRYPTO("cbc(sm4)");
MODULE_ALIAS_CRYPTO("cfb(sm4)");
MODULE_ALIAS_CRYPTO("ctr(sm4)");
MODULE_ALIAS_CRYPTO("cts(cbc(sm4))");
MODULE_AUTHOR("Tianjia Zhang <tianjia.zhang@linux.alibaba.com>");
MODULE_LICENSE("GPL v2");
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