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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* SM4 Cipher Algorithm, AES-NI/AVX optimized.
* as specified in
* https://tools.ietf.org/id/draft-ribose-cfrg-sm4-10.html
*
* Copyright (c) 2021, Alibaba Group.
* Copyright (c) 2021 Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
*/
#include <linux/module.h>
#include <linux/crypto.h>
#include <linux/kernel.h>
#include <asm/simd.h>
#include <crypto/internal/simd.h>
#include <crypto/internal/skcipher.h>
#include <crypto/sm4.h>
#include "sm4-avx.h"
#define SM4_CRYPT8_BLOCK_SIZE (SM4_BLOCK_SIZE * 8)
asmlinkage void sm4_aesni_avx_crypt4(const u32 *rk, u8 *dst,
const u8 *src, int nblocks);
asmlinkage void sm4_aesni_avx_crypt8(const u32 *rk, u8 *dst,
const u8 *src, int nblocks);
asmlinkage void sm4_aesni_avx_ctr_enc_blk8(const u32 *rk, u8 *dst,
const u8 *src, u8 *iv);
asmlinkage void sm4_aesni_avx_cbc_dec_blk8(const u32 *rk, u8 *dst,
const u8 *src, u8 *iv);
static int sm4_skcipher_setkey(struct crypto_skcipher *tfm, const u8 *key,
unsigned int key_len)
{
struct sm4_ctx *ctx = crypto_skcipher_ctx(tfm);
return sm4_expandkey(ctx, key, key_len);
}
static int 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;
kernel_fpu_begin();
while (nbytes >= SM4_CRYPT8_BLOCK_SIZE) {
sm4_aesni_avx_crypt8(rkey, dst, src, 8);
dst += SM4_CRYPT8_BLOCK_SIZE;
src += SM4_CRYPT8_BLOCK_SIZE;
nbytes -= SM4_CRYPT8_BLOCK_SIZE;
}
while (nbytes >= SM4_BLOCK_SIZE) {
unsigned int nblocks = min(nbytes >> 4, 4u);
sm4_aesni_avx_crypt4(rkey, dst, src, nblocks);
dst += nblocks * SM4_BLOCK_SIZE;
src += nblocks * SM4_BLOCK_SIZE;
nbytes -= nblocks * SM4_BLOCK_SIZE;
}
kernel_fpu_end();
err = skcipher_walk_done(&walk, nbytes);
}
return err;
}
int sm4_avx_ecb_encrypt(struct skcipher_request *req)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct sm4_ctx *ctx = crypto_skcipher_ctx(tfm);
return ecb_do_crypt(req, ctx->rkey_enc);
}
EXPORT_SYMBOL_GPL(sm4_avx_ecb_encrypt);
int sm4_avx_ecb_decrypt(struct skcipher_request *req)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct sm4_ctx *ctx = crypto_skcipher_ctx(tfm);
return ecb_do_crypt(req, ctx->rkey_dec);
}
EXPORT_SYMBOL_GPL(sm4_avx_ecb_decrypt);
int sm4_cbc_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 *iv = walk.iv;
const u8 *src = walk.src.virt.addr;
u8 *dst = walk.dst.virt.addr;
while (nbytes >= SM4_BLOCK_SIZE) {
crypto_xor_cpy(dst, src, iv, SM4_BLOCK_SIZE);
sm4_crypt_block(ctx->rkey_enc, dst, dst);
iv = dst;
src += SM4_BLOCK_SIZE;
dst += SM4_BLOCK_SIZE;
nbytes -= SM4_BLOCK_SIZE;
}
if (iv != walk.iv)
memcpy(walk.iv, iv, SM4_BLOCK_SIZE);
err = skcipher_walk_done(&walk, nbytes);
}
return err;
}
EXPORT_SYMBOL_GPL(sm4_cbc_encrypt);
int sm4_avx_cbc_decrypt(struct skcipher_request *req,
unsigned int bsize, sm4_crypt_func func)
{
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;
kernel_fpu_begin();
while (nbytes >= bsize) {
func(ctx->rkey_dec, dst, src, walk.iv);
dst += bsize;
src += bsize;
nbytes -= bsize;
}
while (nbytes >= SM4_BLOCK_SIZE) {
u8 keystream[SM4_BLOCK_SIZE * 8];
u8 iv[SM4_BLOCK_SIZE];
unsigned int nblocks = min(nbytes >> 4, 8u);
int i;
sm4_aesni_avx_crypt8(ctx->rkey_dec, keystream,
src, nblocks);
src += ((int)nblocks - 2) * SM4_BLOCK_SIZE;
dst += (nblocks - 1) * SM4_BLOCK_SIZE;
memcpy(iv, src + SM4_BLOCK_SIZE, SM4_BLOCK_SIZE);
for (i = nblocks - 1; i > 0; i--) {
crypto_xor_cpy(dst, src,
&keystream[i * SM4_BLOCK_SIZE],
SM4_BLOCK_SIZE);
src -= SM4_BLOCK_SIZE;
dst -= SM4_BLOCK_SIZE;
}
crypto_xor_cpy(dst, walk.iv, keystream, SM4_BLOCK_SIZE);
memcpy(walk.iv, iv, SM4_BLOCK_SIZE);
dst += nblocks * SM4_BLOCK_SIZE;
src += (nblocks + 1) * SM4_BLOCK_SIZE;
nbytes -= nblocks * SM4_BLOCK_SIZE;
}
kernel_fpu_end();
err = skcipher_walk_done(&walk, nbytes);
}
return err;
}
EXPORT_SYMBOL_GPL(sm4_avx_cbc_decrypt);
static int cbc_decrypt(struct skcipher_request *req)
{
return sm4_avx_cbc_decrypt(req, SM4_CRYPT8_BLOCK_SIZE,
sm4_aesni_avx_cbc_dec_blk8);
}
int sm4_avx_ctr_crypt(struct skcipher_request *req,
unsigned int bsize, sm4_crypt_func func)
{
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;
kernel_fpu_begin();
while (nbytes >= bsize) {
func(ctx->rkey_enc, dst, src, walk.iv);
dst += bsize;
src += bsize;
nbytes -= bsize;
}
while (nbytes >= SM4_BLOCK_SIZE) {
u8 keystream[SM4_BLOCK_SIZE * 8];
unsigned int nblocks = min(nbytes >> 4, 8u);
int i;
for (i = 0; i < nblocks; i++) {
memcpy(&keystream[i * SM4_BLOCK_SIZE],
walk.iv, SM4_BLOCK_SIZE);
crypto_inc(walk.iv, SM4_BLOCK_SIZE);
}
sm4_aesni_avx_crypt8(ctx->rkey_enc, keystream,
keystream, nblocks);
crypto_xor_cpy(dst, src, keystream,
nblocks * SM4_BLOCK_SIZE);
dst += nblocks * SM4_BLOCK_SIZE;
src += nblocks * SM4_BLOCK_SIZE;
nbytes -= nblocks * SM4_BLOCK_SIZE;
}
kernel_fpu_end();
/* tail */
if (walk.nbytes == walk.total && nbytes > 0) {
u8 keystream[SM4_BLOCK_SIZE];
memcpy(keystream, walk.iv, SM4_BLOCK_SIZE);
crypto_inc(walk.iv, SM4_BLOCK_SIZE);
sm4_crypt_block(ctx->rkey_enc, keystream, keystream);
crypto_xor_cpy(dst, src, keystream, nbytes);
dst += nbytes;
src += nbytes;
nbytes = 0;
}
err = skcipher_walk_done(&walk, nbytes);
}
return err;
}
EXPORT_SYMBOL_GPL(sm4_avx_ctr_crypt);
static int ctr_crypt(struct skcipher_request *req)
{
return sm4_avx_ctr_crypt(req, SM4_CRYPT8_BLOCK_SIZE,
sm4_aesni_avx_ctr_enc_blk8);
}
static struct skcipher_alg sm4_aesni_avx_skciphers[] = {
{
.base = {
.cra_name = "__ecb(sm4)",
.cra_driver_name = "__ecb-sm4-aesni-avx",
.cra_priority = 400,
.cra_flags = CRYPTO_ALG_INTERNAL,
.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,
.walksize = 8 * SM4_BLOCK_SIZE,
.setkey = sm4_skcipher_setkey,
.encrypt = sm4_avx_ecb_encrypt,
.decrypt = sm4_avx_ecb_decrypt,
}, {
.base = {
.cra_name = "__cbc(sm4)",
.cra_driver_name = "__cbc-sm4-aesni-avx",
.cra_priority = 400,
.cra_flags = CRYPTO_ALG_INTERNAL,
.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 = 8 * SM4_BLOCK_SIZE,
.setkey = sm4_skcipher_setkey,
.encrypt = sm4_cbc_encrypt,
.decrypt = cbc_decrypt,
}, {
.base = {
.cra_name = "__ctr(sm4)",
.cra_driver_name = "__ctr-sm4-aesni-avx",
.cra_priority = 400,
.cra_flags = CRYPTO_ALG_INTERNAL,
.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,
.walksize = 8 * SM4_BLOCK_SIZE,
.setkey = sm4_skcipher_setkey,
.encrypt = ctr_crypt,
.decrypt = ctr_crypt,
}
};
static struct simd_skcipher_alg *
simd_sm4_aesni_avx_skciphers[ARRAY_SIZE(sm4_aesni_avx_skciphers)];
static int __init sm4_init(void)
{
const char *feature_name;
if (!boot_cpu_has(X86_FEATURE_AVX) ||
!boot_cpu_has(X86_FEATURE_AES) ||
!boot_cpu_has(X86_FEATURE_OSXSAVE)) {
pr_info("AVX or AES-NI instructions are not detected.\n");
return -ENODEV;
}
if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
&feature_name)) {
pr_info("CPU feature '%s' is not supported.\n", feature_name);
return -ENODEV;
}
return simd_register_skciphers_compat(sm4_aesni_avx_skciphers,
ARRAY_SIZE(sm4_aesni_avx_skciphers),
simd_sm4_aesni_avx_skciphers);
}
static void __exit sm4_exit(void)
{
simd_unregister_skciphers(sm4_aesni_avx_skciphers,
ARRAY_SIZE(sm4_aesni_avx_skciphers),
simd_sm4_aesni_avx_skciphers);
}
module_init(sm4_init);
module_exit(sm4_exit);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Tianjia Zhang <tianjia.zhang@linux.alibaba.com>");
MODULE_DESCRIPTION("SM4 Cipher Algorithm, AES-NI/AVX optimized");
MODULE_ALIAS_CRYPTO("sm4");
MODULE_ALIAS_CRYPTO("sm4-aesni-avx");
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