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// SPDX-License-Identifier: GPL-2.0
#include <asm/neon.h>
#include <asm/simd.h>
#include <crypto/algapi.h>
#include <crypto/sm4.h>
#include <crypto/internal/simd.h>
#include <linux/module.h>
#include <linux/cpufeature.h>
#include <linux/types.h>
MODULE_ALIAS_CRYPTO("sm4");
MODULE_ALIAS_CRYPTO("sm4-ce");
MODULE_DESCRIPTION("SM4 symmetric cipher using ARMv8 Crypto Extensions");
MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
MODULE_LICENSE("GPL v2");
asmlinkage void sm4_ce_do_crypt(const u32 *rk, void *out, const void *in);
static int sm4_ce_setkey(struct crypto_tfm *tfm, const u8 *key,
unsigned int key_len)
{
struct sm4_ctx *ctx = crypto_tfm_ctx(tfm);
return sm4_expandkey(ctx, key, key_len);
}
static void sm4_ce_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
{
const struct sm4_ctx *ctx = crypto_tfm_ctx(tfm);
if (!crypto_simd_usable()) {
sm4_crypt_block(ctx->rkey_enc, out, in);
} else {
kernel_neon_begin();
sm4_ce_do_crypt(ctx->rkey_enc, out, in);
kernel_neon_end();
}
}
static void sm4_ce_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
{
const struct sm4_ctx *ctx = crypto_tfm_ctx(tfm);
if (!crypto_simd_usable()) {
sm4_crypt_block(ctx->rkey_dec, out, in);
} else {
kernel_neon_begin();
sm4_ce_do_crypt(ctx->rkey_dec, out, in);
kernel_neon_end();
}
}
static struct crypto_alg sm4_ce_alg = {
.cra_name = "sm4",
.cra_driver_name = "sm4-ce",
.cra_priority = 300,
.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
.cra_blocksize = SM4_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct sm4_ctx),
.cra_module = THIS_MODULE,
.cra_u.cipher = {
.cia_min_keysize = SM4_KEY_SIZE,
.cia_max_keysize = SM4_KEY_SIZE,
.cia_setkey = sm4_ce_setkey,
.cia_encrypt = sm4_ce_encrypt,
.cia_decrypt = sm4_ce_decrypt
}
};
static int __init sm4_ce_mod_init(void)
{
return crypto_register_alg(&sm4_ce_alg);
}
static void __exit sm4_ce_mod_fini(void)
{
crypto_unregister_alg(&sm4_ce_alg);
}
module_cpu_feature_match(SM4, sm4_ce_mod_init);
module_exit(sm4_ce_mod_fini);
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