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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/arm64/crypto/sm4-ce-cipher-glue.c
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// SPDX-License-Identifier: GPL-2.0

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#include <asm/neon.h>

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#include <asm/simd.h>

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#include <crypto/algapi.h>

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#include <crypto/sm4.h>

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#include <crypto/internal/simd.h>

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#include <linux/module.h>

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#include <linux/cpufeature.h>

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#include <linux/types.h>

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MODULE_ALIAS_CRYPTO("sm4");

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MODULE_ALIAS_CRYPTO("sm4-ce");

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MODULE_DESCRIPTION("SM4 symmetric cipher using ARMv8 Crypto Extensions");

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MODULE_AUTHOR("Ard Biesheuvel <[email protected]>");

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MODULE_LICENSE("GPL v2");

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asmlinkage void sm4_ce_do_crypt(const u32 *rk, void *out, const void *in);

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static int sm4_ce_setkey(struct crypto_tfm *tfm, const u8 *key,

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		       unsigned int key_len)

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{

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	struct sm4_ctx *ctx = crypto_tfm_ctx(tfm);

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	return sm4_expandkey(ctx, key, key_len);

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}

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static void sm4_ce_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)

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{

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	const struct sm4_ctx *ctx = crypto_tfm_ctx(tfm);

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	if (!crypto_simd_usable()) {

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		sm4_crypt_block(ctx->rkey_enc, out, in);

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	} else {

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		kernel_neon_begin();

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		sm4_ce_do_crypt(ctx->rkey_enc, out, in);

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		kernel_neon_end();

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	}

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}

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static void sm4_ce_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)

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{

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	const struct sm4_ctx *ctx = crypto_tfm_ctx(tfm);

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	if (!crypto_simd_usable()) {

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		sm4_crypt_block(ctx->rkey_dec, out, in);

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	} else {

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		kernel_neon_begin();

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		sm4_ce_do_crypt(ctx->rkey_dec, out, in);

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		kernel_neon_end();

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	}

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}

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static struct crypto_alg sm4_ce_alg = {

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	.cra_name			= "sm4",

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	.cra_driver_name		= "sm4-ce",

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	.cra_priority			= 300,

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	.cra_flags			= CRYPTO_ALG_TYPE_CIPHER,

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	.cra_blocksize			= SM4_BLOCK_SIZE,

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	.cra_ctxsize			= sizeof(struct sm4_ctx),

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	.cra_module			= THIS_MODULE,

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	.cra_u.cipher = {

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		.cia_min_keysize	= SM4_KEY_SIZE,

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		.cia_max_keysize	= SM4_KEY_SIZE,

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		.cia_setkey		= sm4_ce_setkey,

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		.cia_encrypt		= sm4_ce_encrypt,

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		.cia_decrypt		= sm4_ce_decrypt

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	}

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};

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static int __init sm4_ce_mod_init(void)

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{

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	return crypto_register_alg(&sm4_ce_alg);

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}

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static void __exit sm4_ce_mod_fini(void)

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{

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	crypto_unregister_alg(&sm4_ce_alg);

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}

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module_cpu_feature_match(SM4, sm4_ce_mod_init);

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module_exit(sm4_ce_mod_fini);

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