arch/x86/crypto/chacha_glue.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * x64 SIMD accelerated ChaCha and XChaCha stream ciphers,
  * including ChaCha20 (RFC7539)
  *
  * Copyright (C) 2015 Martin Willi
  */

 #include <crypto/algapi.h>
 #include <crypto/internal/chacha.h>
 #include <crypto/internal/simd.h>
 #include <crypto/internal/skcipher.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/sizes.h>
 #include <asm/simd.h>

 asmlinkage void chacha_block_xor_ssse3(u32 *state, u8 *dst, const u8 *src,
 				       unsigned int len, int nrounds);
 asmlinkage void chacha_4block_xor_ssse3(u32 *state, u8 *dst, const u8 *src,
 					unsigned int len, int nrounds);
 asmlinkage void hchacha_block_ssse3(const u32 *state, u32 *out, int nrounds);

 asmlinkage void chacha_2block_xor_avx2(u32 *state, u8 *dst, const u8 *src,
 				       unsigned int len, int nrounds);
 asmlinkage void chacha_4block_xor_avx2(u32 *state, u8 *dst, const u8 *src,
 				       unsigned int len, int nrounds);
 asmlinkage void chacha_8block_xor_avx2(u32 *state, u8 *dst, const u8 *src,
 				       unsigned int len, int nrounds);

 asmlinkage void chacha_2block_xor_avx512vl(u32 *state, u8 *dst, const u8 *src,
 					   unsigned int len, int nrounds);
 asmlinkage void chacha_4block_xor_avx512vl(u32 *state, u8 *dst, const u8 *src,
 					   unsigned int len, int nrounds);
 asmlinkage void chacha_8block_xor_avx512vl(u32 *state, u8 *dst, const u8 *src,
 					   unsigned int len, int nrounds);

 static __ro_after_init DEFINE_STATIC_KEY_FALSE(chacha_use_simd);
 static __ro_after_init DEFINE_STATIC_KEY_FALSE(chacha_use_avx2);
 static __ro_after_init DEFINE_STATIC_KEY_FALSE(chacha_use_avx512vl);

 static unsigned int chacha_advance(unsigned int len, unsigned int maxblocks)
 {
 	len = min(len, maxblocks * CHACHA_BLOCK_SIZE);
 	return round_up(len, CHACHA_BLOCK_SIZE) / CHACHA_BLOCK_SIZE;
 }

 static void chacha_dosimd(u32 *state, u8 *dst, const u8 *src,
 			  unsigned int bytes, int nrounds)
 {
 	if (IS_ENABLED(CONFIG_AS_AVX512) &&
 	    static_branch_likely(&chacha_use_avx512vl)) {
 		while (bytes >= CHACHA_BLOCK_SIZE * 8) {
 			chacha_8block_xor_avx512vl(state, dst, src, bytes,
 						   nrounds);
 			bytes -= CHACHA_BLOCK_SIZE * 8;
 			src += CHACHA_BLOCK_SIZE * 8;
 			dst += CHACHA_BLOCK_SIZE * 8;
 			state[12] += 8;
 		}
 		if (bytes > CHACHA_BLOCK_SIZE * 4) {
 			chacha_8block_xor_avx512vl(state, dst, src, bytes,
 						   nrounds);
 			state[12] += chacha_advance(bytes, 8);
 			return;
 		}
 		if (bytes > CHACHA_BLOCK_SIZE * 2) {
 			chacha_4block_xor_avx512vl(state, dst, src, bytes,
 						   nrounds);
 			state[12] += chacha_advance(bytes, 4);
 			return;
 		}
 		if (bytes) {
 			chacha_2block_xor_avx512vl(state, dst, src, bytes,
 						   nrounds);
 			state[12] += chacha_advance(bytes, 2);
 			return;
 		}
 	}

 	if (static_branch_likely(&chacha_use_avx2)) {
 		while (bytes >= CHACHA_BLOCK_SIZE * 8) {
 			chacha_8block_xor_avx2(state, dst, src, bytes, nrounds);
 			bytes -= CHACHA_BLOCK_SIZE * 8;
 			src += CHACHA_BLOCK_SIZE * 8;
 			dst += CHACHA_BLOCK_SIZE * 8;
 			state[12] += 8;
 		}
 		if (bytes > CHACHA_BLOCK_SIZE * 4) {
 			chacha_8block_xor_avx2(state, dst, src, bytes, nrounds);
 			state[12] += chacha_advance(bytes, 8);
 			return;
 		}
 		if (bytes > CHACHA_BLOCK_SIZE * 2) {
 			chacha_4block_xor_avx2(state, dst, src, bytes, nrounds);
 			state[12] += chacha_advance(bytes, 4);
 			return;
 		}
 		if (bytes > CHACHA_BLOCK_SIZE) {
 			chacha_2block_xor_avx2(state, dst, src, bytes, nrounds);
 			state[12] += chacha_advance(bytes, 2);
 			return;
 		}
 	}

 	while (bytes >= CHACHA_BLOCK_SIZE * 4) {
 		chacha_4block_xor_ssse3(state, dst, src, bytes, nrounds);
 		bytes -= CHACHA_BLOCK_SIZE * 4;
 		src += CHACHA_BLOCK_SIZE * 4;
 		dst += CHACHA_BLOCK_SIZE * 4;
 		state[12] += 4;
 	}
 	if (bytes > CHACHA_BLOCK_SIZE) {
 		chacha_4block_xor_ssse3(state, dst, src, bytes, nrounds);
 		state[12] += chacha_advance(bytes, 4);
 		return;
 	}
 	if (bytes) {
 		chacha_block_xor_ssse3(state, dst, src, bytes, nrounds);
 		state[12]++;
 	}
 }

 void hchacha_block_arch(const u32 *state, u32 *stream, int nrounds)
 {
 	if (!static_branch_likely(&chacha_use_simd) || !crypto_simd_usable()) {
 		hchacha_block_generic(state, stream, nrounds);
 	} else {
 		kernel_fpu_begin();
 		hchacha_block_ssse3(state, stream, nrounds);
 		kernel_fpu_end();
 	}
 }
 EXPORT_SYMBOL(hchacha_block_arch);

 void chacha_init_arch(u32 *state, const u32 *key, const u8 *iv)
 {
 	chacha_init_generic(state, key, iv);
 }
 EXPORT_SYMBOL(chacha_init_arch);

 void chacha_crypt_arch(u32 *state, u8 *dst, const u8 *src, unsigned int bytes,
 		       int nrounds)
 {
 	if (!static_branch_likely(&chacha_use_simd) || !crypto_simd_usable() ||
 	    bytes <= CHACHA_BLOCK_SIZE)
 		return chacha_crypt_generic(state, dst, src, bytes, nrounds);

 	do {
 		unsigned int todo = min_t(unsigned int, bytes, SZ_4K);

 		kernel_fpu_begin();
 		chacha_dosimd(state, dst, src, todo, nrounds);
 		kernel_fpu_end();

 		bytes -= todo;
 		src += todo;
 		dst += todo;
 	} while (bytes);
 }
 EXPORT_SYMBOL(chacha_crypt_arch);

 static int chacha_simd_stream_xor(struct skcipher_request *req,
 				  const struct chacha_ctx *ctx, const u8 *iv)
 {
 	u32 state[CHACHA_STATE_WORDS] __aligned(8);
 	struct skcipher_walk walk;
 	int err;

 	err = skcipher_walk_virt(&walk, req, false);

 	chacha_init_generic(state, ctx->key, iv);

 	while (walk.nbytes > 0) {
 		unsigned int nbytes = walk.nbytes;

 		if (nbytes < walk.total)
 			nbytes = round_down(nbytes, walk.stride);

 		if (!static_branch_likely(&chacha_use_simd) ||
 		    !crypto_simd_usable()) {
 			chacha_crypt_generic(state, walk.dst.virt.addr,
 					     walk.src.virt.addr, nbytes,
 					     ctx->nrounds);
 		} else {
 			kernel_fpu_begin();
 			chacha_dosimd(state, walk.dst.virt.addr,
 				      walk.src.virt.addr, nbytes,
 				      ctx->nrounds);
 			kernel_fpu_end();
 		}
 		err = skcipher_walk_done(&walk, walk.nbytes - nbytes);
 	}

 	return err;
 }

 static int chacha_simd(struct skcipher_request *req)
 {
 	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 	struct chacha_ctx *ctx = crypto_skcipher_ctx(tfm);

 	return chacha_simd_stream_xor(req, ctx, req->iv);
 }

 static int xchacha_simd(struct skcipher_request *req)
 {
 	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 	struct chacha_ctx *ctx = crypto_skcipher_ctx(tfm);
 	u32 state[CHACHA_STATE_WORDS] __aligned(8);
 	struct chacha_ctx subctx;
 	u8 real_iv[16];

 	chacha_init_generic(state, ctx->key, req->iv);

 	if (req->cryptlen > CHACHA_BLOCK_SIZE && crypto_simd_usable()) {
 		kernel_fpu_begin();
 		hchacha_block_ssse3(state, subctx.key, ctx->nrounds);
 		kernel_fpu_end();
 	} else {
 		hchacha_block_generic(state, subctx.key, ctx->nrounds);
 	}
 	subctx.nrounds = ctx->nrounds;

 	memcpy(&real_iv[0], req->iv + 24, 8);
 	memcpy(&real_iv[8], req->iv + 16, 8);
 	return chacha_simd_stream_xor(req, &subctx, real_iv);
 }

 static struct skcipher_alg algs[] = {
 	{
 		.base.cra_name		= "chacha20",
 		.base.cra_driver_name	= "chacha20-simd",
 		.base.cra_priority	= 300,
 		.base.cra_blocksize	= 1,
 		.base.cra_ctxsize	= sizeof(struct chacha_ctx),
 		.base.cra_module	= THIS_MODULE,

 		.min_keysize		= CHACHA_KEY_SIZE,
 		.max_keysize		= CHACHA_KEY_SIZE,
 		.ivsize			= CHACHA_IV_SIZE,
 		.chunksize		= CHACHA_BLOCK_SIZE,
 		.setkey			= chacha20_setkey,
 		.encrypt		= chacha_simd,
 		.decrypt		= chacha_simd,
 	}, {
 		.base.cra_name		= "xchacha20",
 		.base.cra_driver_name	= "xchacha20-simd",
 		.base.cra_priority	= 300,
 		.base.cra_blocksize	= 1,
 		.base.cra_ctxsize	= sizeof(struct chacha_ctx),
 		.base.cra_module	= THIS_MODULE,

 		.min_keysize		= CHACHA_KEY_SIZE,
 		.max_keysize		= CHACHA_KEY_SIZE,
 		.ivsize			= XCHACHA_IV_SIZE,
 		.chunksize		= CHACHA_BLOCK_SIZE,
 		.setkey			= chacha20_setkey,
 		.encrypt		= xchacha_simd,
 		.decrypt		= xchacha_simd,
 	}, {
 		.base.cra_name		= "xchacha12",
 		.base.cra_driver_name	= "xchacha12-simd",
 		.base.cra_priority	= 300,
 		.base.cra_blocksize	= 1,
 		.base.cra_ctxsize	= sizeof(struct chacha_ctx),
 		.base.cra_module	= THIS_MODULE,

 		.min_keysize		= CHACHA_KEY_SIZE,
 		.max_keysize		= CHACHA_KEY_SIZE,
 		.ivsize			= XCHACHA_IV_SIZE,
 		.chunksize		= CHACHA_BLOCK_SIZE,
 		.setkey			= chacha12_setkey,
 		.encrypt		= xchacha_simd,
 		.decrypt		= xchacha_simd,
 	},
 };

 static int __init chacha_simd_mod_init(void)
 {
 	if (!boot_cpu_has(X86_FEATURE_SSSE3))
 		return 0;

 	static_branch_enable(&chacha_use_simd);

 	if (boot_cpu_has(X86_FEATURE_AVX) &&
 	    boot_cpu_has(X86_FEATURE_AVX2) &&
 	    cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, NULL)) {
 		static_branch_enable(&chacha_use_avx2);

 		if (IS_ENABLED(CONFIG_AS_AVX512) &&
 		    boot_cpu_has(X86_FEATURE_AVX512VL) &&
 		    boot_cpu_has(X86_FEATURE_AVX512BW)) /* kmovq */
 			static_branch_enable(&chacha_use_avx512vl);
 	}
 	return IS_REACHABLE(CONFIG_CRYPTO_SKCIPHER) ?
 		crypto_register_skciphers(algs, ARRAY_SIZE(algs)) : 0;
 }

 static void __exit chacha_simd_mod_fini(void)
 {
 	if (IS_REACHABLE(CONFIG_CRYPTO_SKCIPHER) && boot_cpu_has(X86_FEATURE_SSSE3))
 		crypto_unregister_skciphers(algs, ARRAY_SIZE(algs));
 }

 module_init(chacha_simd_mod_init);
 module_exit(chacha_simd_mod_fini);

 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Martin Willi <martin@strongswan.org>");
 MODULE_DESCRIPTION("ChaCha and XChaCha stream ciphers (x64 SIMD accelerated)");
 MODULE_ALIAS_CRYPTO("chacha20");
 MODULE_ALIAS_CRYPTO("chacha20-simd");
 MODULE_ALIAS_CRYPTO("xchacha20");
 MODULE_ALIAS_CRYPTO("xchacha20-simd");
 MODULE_ALIAS_CRYPTO("xchacha12");
 MODULE_ALIAS_CRYPTO("xchacha12-simd");
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* x64 SIMD accelerated ChaCha and XChaCha stream ciphers,
	* including ChaCha20 (RFC7539)
	*
	* Copyright (C) 2015 Martin Willi
	*/

	#include <crypto/algapi.h>
	#include <crypto/internal/chacha.h>
	#include <crypto/internal/simd.h>
	#include <crypto/internal/skcipher.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/sizes.h>
	#include <asm/simd.h>

	asmlinkage void chacha_block_xor_ssse3(u32 state, u8 dst, const u8 *src,
	unsigned int len, int nrounds);
	asmlinkage void chacha_4block_xor_ssse3(u32 state, u8 dst, const u8 *src,
	unsigned int len, int nrounds);
	asmlinkage void hchacha_block_ssse3(const u32 state, u32 out, int nrounds);

	asmlinkage void chacha_2block_xor_avx2(u32 state, u8 dst, const u8 *src,
	unsigned int len, int nrounds);
	asmlinkage void chacha_4block_xor_avx2(u32 state, u8 dst, const u8 *src,
	unsigned int len, int nrounds);
	asmlinkage void chacha_8block_xor_avx2(u32 state, u8 dst, const u8 *src,
	unsigned int len, int nrounds);

	asmlinkage void chacha_2block_xor_avx512vl(u32 state, u8 dst, const u8 *src,
	unsigned int len, int nrounds);
	asmlinkage void chacha_4block_xor_avx512vl(u32 state, u8 dst, const u8 *src,
	unsigned int len, int nrounds);
	asmlinkage void chacha_8block_xor_avx512vl(u32 state, u8 dst, const u8 *src,
	unsigned int len, int nrounds);

	static __ro_after_init DEFINE_STATIC_KEY_FALSE(chacha_use_simd);
	static __ro_after_init DEFINE_STATIC_KEY_FALSE(chacha_use_avx2);
	static __ro_after_init DEFINE_STATIC_KEY_FALSE(chacha_use_avx512vl);

	static unsigned int chacha_advance(unsigned int len, unsigned int maxblocks)
	{
	len = min(len, maxblocks * CHACHA_BLOCK_SIZE);
	return round_up(len, CHACHA_BLOCK_SIZE) / CHACHA_BLOCK_SIZE;
	}

	static void chacha_dosimd(u32 state, u8 dst, const u8 *src,
	unsigned int bytes, int nrounds)
	{
	if (IS_ENABLED(CONFIG_AS_AVX512) &&
	static_branch_likely(&chacha_use_avx512vl)) {
	while (bytes >= CHACHA_BLOCK_SIZE * 8) {
	chacha_8block_xor_avx512vl(state, dst, src, bytes,
	nrounds);
	bytes -= CHACHA_BLOCK_SIZE * 8;
	src += CHACHA_BLOCK_SIZE * 8;
	dst += CHACHA_BLOCK_SIZE * 8;
	state[12] += 8;
	}
	if (bytes > CHACHA_BLOCK_SIZE * 4) {
	chacha_8block_xor_avx512vl(state, dst, src, bytes,
	nrounds);
	state[12] += chacha_advance(bytes, 8);
	return;
	}
	if (bytes > CHACHA_BLOCK_SIZE * 2) {
	chacha_4block_xor_avx512vl(state, dst, src, bytes,
	nrounds);
	state[12] += chacha_advance(bytes, 4);
	return;
	}
	if (bytes) {
	chacha_2block_xor_avx512vl(state, dst, src, bytes,
	nrounds);
	state[12] += chacha_advance(bytes, 2);
	return;
	}
	}

	if (static_branch_likely(&chacha_use_avx2)) {
	while (bytes >= CHACHA_BLOCK_SIZE * 8) {
	chacha_8block_xor_avx2(state, dst, src, bytes, nrounds);
	bytes -= CHACHA_BLOCK_SIZE * 8;
	src += CHACHA_BLOCK_SIZE * 8;
	dst += CHACHA_BLOCK_SIZE * 8;
	state[12] += 8;
	}
	if (bytes > CHACHA_BLOCK_SIZE * 4) {
	chacha_8block_xor_avx2(state, dst, src, bytes, nrounds);
	state[12] += chacha_advance(bytes, 8);
	return;
	}
	if (bytes > CHACHA_BLOCK_SIZE * 2) {
	chacha_4block_xor_avx2(state, dst, src, bytes, nrounds);
	state[12] += chacha_advance(bytes, 4);
	return;
	}
	if (bytes > CHACHA_BLOCK_SIZE) {
	chacha_2block_xor_avx2(state, dst, src, bytes, nrounds);
	state[12] += chacha_advance(bytes, 2);
	return;
	}
	}

	while (bytes >= CHACHA_BLOCK_SIZE * 4) {
	chacha_4block_xor_ssse3(state, dst, src, bytes, nrounds);
	bytes -= CHACHA_BLOCK_SIZE * 4;
	src += CHACHA_BLOCK_SIZE * 4;
	dst += CHACHA_BLOCK_SIZE * 4;
	state[12] += 4;
	}
	if (bytes > CHACHA_BLOCK_SIZE) {
	chacha_4block_xor_ssse3(state, dst, src, bytes, nrounds);
	state[12] += chacha_advance(bytes, 4);
	return;
	}
	if (bytes) {
	chacha_block_xor_ssse3(state, dst, src, bytes, nrounds);
	state[12]++;
	}
	}

	void hchacha_block_arch(const u32 state, u32 stream, int nrounds)
	{
	if (!static_branch_likely(&chacha_use_simd) \|\| !crypto_simd_usable()) {
	hchacha_block_generic(state, stream, nrounds);
	} else {
	kernel_fpu_begin();
	hchacha_block_ssse3(state, stream, nrounds);
	kernel_fpu_end();
	}
	}
	EXPORT_SYMBOL(hchacha_block_arch);

	void chacha_init_arch(u32 state, const u32 key, const u8 *iv)
	{
	chacha_init_generic(state, key, iv);
	}
	EXPORT_SYMBOL(chacha_init_arch);

	void chacha_crypt_arch(u32 state, u8 dst, const u8 *src, unsigned int bytes,
	int nrounds)
	{
	if (!static_branch_likely(&chacha_use_simd) \|\| !crypto_simd_usable() \|\|
	bytes <= CHACHA_BLOCK_SIZE)
	return chacha_crypt_generic(state, dst, src, bytes, nrounds);

	do {
	unsigned int todo = min_t(unsigned int, bytes, SZ_4K);

	kernel_fpu_begin();
	chacha_dosimd(state, dst, src, todo, nrounds);
	kernel_fpu_end();

	bytes -= todo;
	src += todo;
	dst += todo;
	} while (bytes);
	}
	EXPORT_SYMBOL(chacha_crypt_arch);

	static int chacha_simd_stream_xor(struct skcipher_request *req,
	const struct chacha_ctx ctx, const u8 iv)
	{
	u32 state[CHACHA_STATE_WORDS] __aligned(8);
	struct skcipher_walk walk;
	int err;

	err = skcipher_walk_virt(&walk, req, false);

	chacha_init_generic(state, ctx->key, iv);

	while (walk.nbytes > 0) {
	unsigned int nbytes = walk.nbytes;

	if (nbytes < walk.total)
	nbytes = round_down(nbytes, walk.stride);

	if (!static_branch_likely(&chacha_use_simd) \|\|
	!crypto_simd_usable()) {
	chacha_crypt_generic(state, walk.dst.virt.addr,
	walk.src.virt.addr, nbytes,
	ctx->nrounds);
	} else {
	kernel_fpu_begin();
	chacha_dosimd(state, walk.dst.virt.addr,
	walk.src.virt.addr, nbytes,
	ctx->nrounds);
	kernel_fpu_end();
	}
	err = skcipher_walk_done(&walk, walk.nbytes - nbytes);
	}

	return err;
	}

	static int chacha_simd(struct skcipher_request *req)
	{
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	struct chacha_ctx *ctx = crypto_skcipher_ctx(tfm);

	return chacha_simd_stream_xor(req, ctx, req->iv);
	}

	static int xchacha_simd(struct skcipher_request *req)
	{
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	struct chacha_ctx *ctx = crypto_skcipher_ctx(tfm);
	u32 state[CHACHA_STATE_WORDS] __aligned(8);
	struct chacha_ctx subctx;
	u8 real_iv[16];

	chacha_init_generic(state, ctx->key, req->iv);

	if (req->cryptlen > CHACHA_BLOCK_SIZE && crypto_simd_usable()) {
	kernel_fpu_begin();
	hchacha_block_ssse3(state, subctx.key, ctx->nrounds);
	kernel_fpu_end();
	} else {
	hchacha_block_generic(state, subctx.key, ctx->nrounds);
	}
	subctx.nrounds = ctx->nrounds;

	memcpy(&real_iv[0], req->iv + 24, 8);
	memcpy(&real_iv[8], req->iv + 16, 8);
	return chacha_simd_stream_xor(req, &subctx, real_iv);
	}

	static struct skcipher_alg algs[] = {
	{
	.base.cra_name = "chacha20",
	.base.cra_driver_name = "chacha20-simd",
	.base.cra_priority = 300,
	.base.cra_blocksize = 1,
	.base.cra_ctxsize = sizeof(struct chacha_ctx),
	.base.cra_module = THIS_MODULE,

	.min_keysize = CHACHA_KEY_SIZE,
	.max_keysize = CHACHA_KEY_SIZE,
	.ivsize = CHACHA_IV_SIZE,
	.chunksize = CHACHA_BLOCK_SIZE,
	.setkey = chacha20_setkey,
	.encrypt = chacha_simd,
	.decrypt = chacha_simd,
	}, {
	.base.cra_name = "xchacha20",
	.base.cra_driver_name = "xchacha20-simd",
	.base.cra_priority = 300,
	.base.cra_blocksize = 1,
	.base.cra_ctxsize = sizeof(struct chacha_ctx),
	.base.cra_module = THIS_MODULE,

	.min_keysize = CHACHA_KEY_SIZE,
	.max_keysize = CHACHA_KEY_SIZE,
	.ivsize = XCHACHA_IV_SIZE,
	.chunksize = CHACHA_BLOCK_SIZE,
	.setkey = chacha20_setkey,
	.encrypt = xchacha_simd,
	.decrypt = xchacha_simd,
	}, {
	.base.cra_name = "xchacha12",
	.base.cra_driver_name = "xchacha12-simd",
	.base.cra_priority = 300,
	.base.cra_blocksize = 1,
	.base.cra_ctxsize = sizeof(struct chacha_ctx),
	.base.cra_module = THIS_MODULE,

	.min_keysize = CHACHA_KEY_SIZE,
	.max_keysize = CHACHA_KEY_SIZE,
	.ivsize = XCHACHA_IV_SIZE,
	.chunksize = CHACHA_BLOCK_SIZE,
	.setkey = chacha12_setkey,
	.encrypt = xchacha_simd,
	.decrypt = xchacha_simd,
	},
	};

	static int __init chacha_simd_mod_init(void)
	{
	if (!boot_cpu_has(X86_FEATURE_SSSE3))
	return 0;

	static_branch_enable(&chacha_use_simd);

	if (boot_cpu_has(X86_FEATURE_AVX) &&
	boot_cpu_has(X86_FEATURE_AVX2) &&
	cpu_has_xfeatures(XFEATURE_MASK_SSE \| XFEATURE_MASK_YMM, NULL)) {
	static_branch_enable(&chacha_use_avx2);

	if (IS_ENABLED(CONFIG_AS_AVX512) &&
	boot_cpu_has(X86_FEATURE_AVX512VL) &&
	boot_cpu_has(X86_FEATURE_AVX512BW)) /* kmovq */
	static_branch_enable(&chacha_use_avx512vl);
	}
	return IS_REACHABLE(CONFIG_CRYPTO_SKCIPHER) ?
	crypto_register_skciphers(algs, ARRAY_SIZE(algs)) : 0;
	}

	static void __exit chacha_simd_mod_fini(void)
	{
	if (IS_REACHABLE(CONFIG_CRYPTO_SKCIPHER) && boot_cpu_has(X86_FEATURE_SSSE3))
	crypto_unregister_skciphers(algs, ARRAY_SIZE(algs));
	}

	module_init(chacha_simd_mod_init);
	module_exit(chacha_simd_mod_fini);

	MODULE_LICENSE("GPL");
	MODULE_AUTHOR("Martin Willi <martin@strongswan.org>");
	MODULE_DESCRIPTION("ChaCha and XChaCha stream ciphers (x64 SIMD accelerated)");
	MODULE_ALIAS_CRYPTO("chacha20");
	MODULE_ALIAS_CRYPTO("chacha20-simd");
	MODULE_ALIAS_CRYPTO("xchacha20");
	MODULE_ALIAS_CRYPTO("xchacha20-simd");
	MODULE_ALIAS_CRYPTO("xchacha12");
	MODULE_ALIAS_CRYPTO("xchacha12-simd");