[linux-block.git] / arch / arm / crypto / chacha-glue.c

// SPDX-License-Identifier: GPL-2.0
/*
 * ARM NEON accelerated ChaCha and XChaCha stream ciphers,
 * including ChaCha20 (RFC7539)
 *
 * Copyright (C) 2016-2019 Linaro, Ltd. <ard.biesheuvel@linaro.org>
 * 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/jump_label.h>
#include <linux/kernel.h>
#include <linux/module.h>

#include <asm/cputype.h>
#include <asm/hwcap.h>
#include <asm/neon.h>
#include <asm/simd.h>

asmlinkage void chacha_block_xor_neon(const u32 *state, u8 *dst, const u8 *src,
				      int nrounds);
asmlinkage void chacha_4block_xor_neon(const u32 *state, u8 *dst, const u8 *src,
				       int nrounds, unsigned int nbytes);
asmlinkage void hchacha_block_arm(const u32 *state, u32 *out, int nrounds);
asmlinkage void hchacha_block_neon(const u32 *state, u32 *out, int nrounds);

asmlinkage void chacha_doarm(u8 *dst, const u8 *src, unsigned int bytes,
			     const u32 *state, int nrounds);

static __ro_after_init DEFINE_STATIC_KEY_FALSE(use_neon);

static inline bool neon_usable(void)
{
	return static_branch_likely(&use_neon) && crypto_simd_usable();
}

static void chacha_doneon(u32 *state, u8 *dst, const u8 *src,
			  unsigned int bytes, int nrounds)
{
	u8 buf[CHACHA_BLOCK_SIZE];

	while (bytes > CHACHA_BLOCK_SIZE) {
		unsigned int l = min(bytes, CHACHA_BLOCK_SIZE * 4U);

		chacha_4block_xor_neon(state, dst, src, nrounds, l);
		bytes -= l;
		src += l;
		dst += l;
		state[12] += DIV_ROUND_UP(l, CHACHA_BLOCK_SIZE);
	}
	if (bytes) {
		const u8 *s = src;
		u8 *d = dst;

		if (bytes != CHACHA_BLOCK_SIZE)
			s = d = memcpy(buf, src, bytes);
		chacha_block_xor_neon(state, d, s, nrounds);
		if (d != dst)
			memcpy(dst, buf, bytes);
		state[12]++;
	}
}

void hchacha_block_arch(const u32 *state, u32 *stream, int nrounds)
{
	if (!IS_ENABLED(CONFIG_KERNEL_MODE_NEON) || !neon_usable()) {
		hchacha_block_arm(state, stream, nrounds);
	} else {
		kernel_neon_begin();
		hchacha_block_neon(state, stream, nrounds);
		kernel_neon_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 (!IS_ENABLED(CONFIG_KERNEL_MODE_NEON) || !neon_usable() ||
	    bytes <= CHACHA_BLOCK_SIZE) {
		chacha_doarm(dst, src, bytes, state, nrounds);
		state[12] += DIV_ROUND_UP(bytes, CHACHA_BLOCK_SIZE);
		return;
	}

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

		kernel_neon_begin();
		chacha_doneon(state, dst, src, todo, nrounds);
		kernel_neon_end();

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

static int chacha_stream_xor(struct skcipher_request *req,
			     const struct chacha_ctx *ctx, const u8 *iv,
			     bool neon)
{
	struct skcipher_walk walk;
	u32 state[16];
	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 (!IS_ENABLED(CONFIG_KERNEL_MODE_NEON) || !neon) {
			chacha_doarm(walk.dst.virt.addr, walk.src.virt.addr,
				     nbytes, state, ctx->nrounds);
			state[12] += DIV_ROUND_UP(nbytes, CHACHA_BLOCK_SIZE);
		} else {
			kernel_neon_begin();
			chacha_doneon(state, walk.dst.virt.addr,
				      walk.src.virt.addr, nbytes, ctx->nrounds);
			kernel_neon_end();
		}
		err = skcipher_walk_done(&walk, walk.nbytes - nbytes);
	}

	return err;
}

static int do_chacha(struct skcipher_request *req, bool neon)
{
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	struct chacha_ctx *ctx = crypto_skcipher_ctx(tfm);

	return chacha_stream_xor(req, ctx, req->iv, neon);
}

static int chacha_arm(struct skcipher_request *req)
{
	return do_chacha(req, false);
}

static int chacha_neon(struct skcipher_request *req)
{
	return do_chacha(req, neon_usable());
}

static int do_xchacha(struct skcipher_request *req, bool neon)
{
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	struct chacha_ctx *ctx = crypto_skcipher_ctx(tfm);
	struct chacha_ctx subctx;
	u32 state[16];
	u8 real_iv[16];

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

	if (!IS_ENABLED(CONFIG_KERNEL_MODE_NEON) || !neon) {
		hchacha_block_arm(state, subctx.key, ctx->nrounds);
	} else {
		kernel_neon_begin();
		hchacha_block_neon(state, subctx.key, ctx->nrounds);
		kernel_neon_end();
	}
	subctx.nrounds = ctx->nrounds;

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

static int xchacha_arm(struct skcipher_request *req)
{
	return do_xchacha(req, false);
}

static int xchacha_neon(struct skcipher_request *req)
{
	return do_xchacha(req, neon_usable());
}

static struct skcipher_alg arm_algs[] = {
	{
		.base.cra_name		= "chacha20",
		.base.cra_driver_name	= "chacha20-arm",
		.base.cra_priority	= 200,
		.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_arm,
		.decrypt		= chacha_arm,
	}, {
		.base.cra_name		= "xchacha20",
		.base.cra_driver_name	= "xchacha20-arm",
		.base.cra_priority	= 200,
		.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_arm,
		.decrypt		= xchacha_arm,
	}, {
		.base.cra_name		= "xchacha12",
		.base.cra_driver_name	= "xchacha12-arm",
		.base.cra_priority	= 200,
		.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_arm,
		.decrypt		= xchacha_arm,
	},
};

static struct skcipher_alg neon_algs[] = {
	{
		.base.cra_name		= "chacha20",
		.base.cra_driver_name	= "chacha20-neon",
		.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,
		.walksize		= 4 * CHACHA_BLOCK_SIZE,
		.setkey			= chacha20_setkey,
		.encrypt		= chacha_neon,
		.decrypt		= chacha_neon,
	}, {
		.base.cra_name		= "xchacha20",
		.base.cra_driver_name	= "xchacha20-neon",
		.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,
		.walksize		= 4 * CHACHA_BLOCK_SIZE,
		.setkey			= chacha20_setkey,
		.encrypt		= xchacha_neon,
		.decrypt		= xchacha_neon,
	}, {
		.base.cra_name		= "xchacha12",
		.base.cra_driver_name	= "xchacha12-neon",
		.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,
		.walksize		= 4 * CHACHA_BLOCK_SIZE,
		.setkey			= chacha12_setkey,
		.encrypt		= xchacha_neon,
		.decrypt		= xchacha_neon,
	}
};

static int __init chacha_simd_mod_init(void)
{
	int err = 0;

	if (IS_REACHABLE(CONFIG_CRYPTO_SKCIPHER)) {
		err = crypto_register_skciphers(arm_algs, ARRAY_SIZE(arm_algs));
		if (err)
			return err;
	}

	if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) && (elf_hwcap & HWCAP_NEON)) {
		int i;

		switch (read_cpuid_part()) {
		case ARM_CPU_PART_CORTEX_A7:
		case ARM_CPU_PART_CORTEX_A5:
			/*
			 * The Cortex-A7 and Cortex-A5 do not perform well with
			 * the NEON implementation but do incredibly with the
			 * scalar one and use less power.
			 */
			for (i = 0; i < ARRAY_SIZE(neon_algs); i++)
				neon_algs[i].base.cra_priority = 0;
			break;
		default:
			static_branch_enable(&use_neon);
		}

		if (IS_REACHABLE(CONFIG_CRYPTO_SKCIPHER)) {
			err = crypto_register_skciphers(neon_algs, ARRAY_SIZE(neon_algs));
			if (err)
				crypto_unregister_skciphers(arm_algs, ARRAY_SIZE(arm_algs));
		}
	}
	return err;
}

static void __exit chacha_simd_mod_fini(void)
{
	if (IS_REACHABLE(CONFIG_CRYPTO_SKCIPHER)) {
		crypto_unregister_skciphers(arm_algs, ARRAY_SIZE(arm_algs));
		if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) && (elf_hwcap & HWCAP_NEON))
			crypto_unregister_skciphers(neon_algs, ARRAY_SIZE(neon_algs));
	}
}

module_init(chacha_simd_mod_init);
module_exit(chacha_simd_mod_fini);

MODULE_DESCRIPTION("ChaCha and XChaCha stream ciphers (scalar and NEON accelerated)");
MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS_CRYPTO("chacha20");
MODULE_ALIAS_CRYPTO("chacha20-arm");
MODULE_ALIAS_CRYPTO("xchacha20");
MODULE_ALIAS_CRYPTO("xchacha20-arm");
MODULE_ALIAS_CRYPTO("xchacha12");
MODULE_ALIAS_CRYPTO("xchacha12-arm");
#ifdef CONFIG_KERNEL_MODE_NEON
MODULE_ALIAS_CRYPTO("chacha20-neon");
MODULE_ALIAS_CRYPTO("xchacha20-neon");
MODULE_ALIAS_CRYPTO("xchacha12-neon");
#endif
Commit	Line	Data
b36d8c09 AB	1	// SPDX-License-Identifier: GPL-2.0
	2	/*
	3	* ARM NEON accelerated ChaCha and XChaCha stream ciphers,
	4	* including ChaCha20 (RFC7539)
	5	*
	6	* Copyright (C) 2016-2019 Linaro, Ltd. <ard.biesheuvel@linaro.org>
	7	* Copyright (C) 2015 Martin Willi
	8	*/
	9
	10	#include <crypto/algapi.h>
	11	#include <crypto/internal/chacha.h>
	12	#include <crypto/internal/simd.h>
	13	#include <crypto/internal/skcipher.h>
a44a3430	14	#include <linux/jump_label.h>
b36d8c09 AB	15	#include <linux/kernel.h>
	16	#include <linux/module.h>
	17
	18	#include <asm/cputype.h>
	19	#include <asm/hwcap.h>
	20	#include <asm/neon.h>
	21	#include <asm/simd.h>
	22
	23	asmlinkage void chacha_block_xor_neon(const u32 state, u8 dst, const u8 *src,
	24	int nrounds);
	25	asmlinkage void chacha_4block_xor_neon(const u32 state, u8 dst, const u8 *src,
86cd97ec	26	int nrounds, unsigned int nbytes);
b36d8c09 AB	27	asmlinkage void hchacha_block_arm(const u32 state, u32 out, int nrounds);
	28	asmlinkage void hchacha_block_neon(const u32 state, u32 out, int nrounds);
	29
	30	asmlinkage void chacha_doarm(u8 dst, const u8 src, unsigned int bytes,
	31	const u32 *state, int nrounds);
	32
a44a3430 AB	33	static __ro_after_init DEFINE_STATIC_KEY_FALSE(use_neon);
a44a3430 AB	34
b36d8c09 AB	35	static inline bool neon_usable(void)
b36d8c09 AB	36	{
a44a3430	37	return static_branch_likely(&use_neon) && crypto_simd_usable();
b36d8c09 AB	38	}
	39
	40	static void chacha_doneon(u32 state, u8 dst, const u8 *src,
	41	unsigned int bytes, int nrounds)
	42	{
	43	u8 buf[CHACHA_BLOCK_SIZE];
	44
86cd97ec AB	45	while (bytes > CHACHA_BLOCK_SIZE) {
	46	unsigned int l = min(bytes, CHACHA_BLOCK_SIZE * 4U);
	47
	48	chacha_4block_xor_neon(state, dst, src, nrounds, l);
	49	bytes -= l;
	50	src += l;
	51	dst += l;
	52	state[12] += DIV_ROUND_UP(l, CHACHA_BLOCK_SIZE);
b36d8c09 AB	53	}
b36d8c09 AB	54	if (bytes) {
86cd97ec AB	55	const u8 *s = src;
	56	u8 *d = dst;
	57
	58	if (bytes != CHACHA_BLOCK_SIZE)
	59	s = d = memcpy(buf, src, bytes);
	60	chacha_block_xor_neon(state, d, s, nrounds);
	61	if (d != dst)
	62	memcpy(dst, buf, bytes);
fd16931a	63	state[12]++;
b36d8c09 AB	64	}
	65	}
	66
a44a3430 AB	67	void hchacha_block_arch(const u32 state, u32 stream, int nrounds)
	68	{
	69	if (!IS_ENABLED(CONFIG_KERNEL_MODE_NEON) \|\| !neon_usable()) {
	70	hchacha_block_arm(state, stream, nrounds);
	71	} else {
	72	kernel_neon_begin();
	73	hchacha_block_neon(state, stream, nrounds);
	74	kernel_neon_end();
	75	}
	76	}
	77	EXPORT_SYMBOL(hchacha_block_arch);
	78
	79	void chacha_init_arch(u32 state, const u32 key, const u8 *iv)
	80	{
	81	chacha_init_generic(state, key, iv);
	82	}
	83	EXPORT_SYMBOL(chacha_init_arch);
	84
	85	void chacha_crypt_arch(u32 state, u8 dst, const u8 *src, unsigned int bytes,
	86	int nrounds)
	87	{
	88	if (!IS_ENABLED(CONFIG_KERNEL_MODE_NEON) \|\| !neon_usable() \|\|
	89	bytes <= CHACHA_BLOCK_SIZE) {
	90	chacha_doarm(dst, src, bytes, state, nrounds);
	91	state[12] += DIV_ROUND_UP(bytes, CHACHA_BLOCK_SIZE);
	92	return;
	93	}
	94
706024a5 JD	95	do {
	96	unsigned int todo = min_t(unsigned int, bytes, SZ_4K);
	97
	98	kernel_neon_begin();
	99	chacha_doneon(state, dst, src, todo, nrounds);
	100	kernel_neon_end();
	101
	102	bytes -= todo;
	103	src += todo;
	104	dst += todo;
	105	} while (bytes);
a44a3430 AB	106	}
	107	EXPORT_SYMBOL(chacha_crypt_arch);
	108
b36d8c09 AB	109	static int chacha_stream_xor(struct skcipher_request *req,
	110	const struct chacha_ctx ctx, const u8 iv,
	111	bool neon)
	112	{
	113	struct skcipher_walk walk;
	114	u32 state[16];
	115	int err;
	116
	117	err = skcipher_walk_virt(&walk, req, false);
	118
	119	chacha_init_generic(state, ctx->key, iv);
	120
	121	while (walk.nbytes > 0) {
	122	unsigned int nbytes = walk.nbytes;
	123
	124	if (nbytes < walk.total)
	125	nbytes = round_down(nbytes, walk.stride);
	126
0bc81767	127	if (!IS_ENABLED(CONFIG_KERNEL_MODE_NEON) \|\| !neon) {
b36d8c09 AB	128	chacha_doarm(walk.dst.virt.addr, walk.src.virt.addr,
	129	nbytes, state, ctx->nrounds);
	130	state[12] += DIV_ROUND_UP(nbytes, CHACHA_BLOCK_SIZE);
	131	} else {
	132	kernel_neon_begin();
	133	chacha_doneon(state, walk.dst.virt.addr,
	134	walk.src.virt.addr, nbytes, ctx->nrounds);
	135	kernel_neon_end();
	136	}
	137	err = skcipher_walk_done(&walk, walk.nbytes - nbytes);
	138	}
	139
	140	return err;
	141	}
	142
	143	static int do_chacha(struct skcipher_request *req, bool neon)
	144	{
	145	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	146	struct chacha_ctx *ctx = crypto_skcipher_ctx(tfm);
	147
	148	return chacha_stream_xor(req, ctx, req->iv, neon);
	149	}
	150
	151	static int chacha_arm(struct skcipher_request *req)
	152	{
	153	return do_chacha(req, false);
	154	}
	155
	156	static int chacha_neon(struct skcipher_request *req)
	157	{
	158	return do_chacha(req, neon_usable());
	159	}
	160
	161	static int do_xchacha(struct skcipher_request *req, bool neon)
	162	{
	163	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	164	struct chacha_ctx *ctx = crypto_skcipher_ctx(tfm);
	165	struct chacha_ctx subctx;
	166	u32 state[16];
	167	u8 real_iv[16];
	168
	169	chacha_init_generic(state, ctx->key, req->iv);
	170
0bc81767	171	if (!IS_ENABLED(CONFIG_KERNEL_MODE_NEON) \|\| !neon) {
b36d8c09 AB	172	hchacha_block_arm(state, subctx.key, ctx->nrounds);
	173	} else {
	174	kernel_neon_begin();
	175	hchacha_block_neon(state, subctx.key, ctx->nrounds);
	176	kernel_neon_end();
	177	}
	178	subctx.nrounds = ctx->nrounds;
	179
	180	memcpy(&real_iv[0], req->iv + 24, 8);
	181	memcpy(&real_iv[8], req->iv + 16, 8);
	182	return chacha_stream_xor(req, &subctx, real_iv, neon);
	183	}
	184
	185	static int xchacha_arm(struct skcipher_request *req)
	186	{
	187	return do_xchacha(req, false);
	188	}
	189
	190	static int xchacha_neon(struct skcipher_request *req)
	191	{
	192	return do_xchacha(req, neon_usable());
	193	}
	194
	195	static struct skcipher_alg arm_algs[] = {
	196	{
	197	.base.cra_name = "chacha20",
	198	.base.cra_driver_name = "chacha20-arm",
	199	.base.cra_priority = 200,
	200	.base.cra_blocksize = 1,
	201	.base.cra_ctxsize = sizeof(struct chacha_ctx),
	202	.base.cra_module = THIS_MODULE,
	203
	204	.min_keysize = CHACHA_KEY_SIZE,
	205	.max_keysize = CHACHA_KEY_SIZE,
	206	.ivsize = CHACHA_IV_SIZE,
	207	.chunksize = CHACHA_BLOCK_SIZE,
	208	.setkey = chacha20_setkey,
	209	.encrypt = chacha_arm,
	210	.decrypt = chacha_arm,
	211	}, {
	212	.base.cra_name = "xchacha20",
	213	.base.cra_driver_name = "xchacha20-arm",
	214	.base.cra_priority = 200,
	215	.base.cra_blocksize = 1,
	216	.base.cra_ctxsize = sizeof(struct chacha_ctx),
	217	.base.cra_module = THIS_MODULE,
	218
	219	.min_keysize = CHACHA_KEY_SIZE,
	220	.max_keysize = CHACHA_KEY_SIZE,
	221	.ivsize = XCHACHA_IV_SIZE,
	222	.chunksize = CHACHA_BLOCK_SIZE,
	223	.setkey = chacha20_setkey,
	224	.encrypt = xchacha_arm,
	225	.decrypt = xchacha_arm,
	226	}, {
	227	.base.cra_name = "xchacha12",
	228	.base.cra_driver_name = "xchacha12-arm",
	229	.base.cra_priority = 200,
	230	.base.cra_blocksize = 1,
	231	.base.cra_ctxsize = sizeof(struct chacha_ctx),
	232	.base.cra_module = THIS_MODULE,
	233
	234	.min_keysize = CHACHA_KEY_SIZE,
	235	.max_keysize = CHACHA_KEY_SIZE,
236	.ivsize = XCHACHA_IV_SIZE,
237	.chunksize = CHACHA_BLOCK_SIZE,
238	.setkey = chacha12_setkey,
239	.encrypt = xchacha_arm,
240	.decrypt = xchacha_arm,
241	},
242	};
243
244	static struct skcipher_alg neon_algs[] = {
245	{
246	.base.cra_name = "chacha20",
247	.base.cra_driver_name = "chacha20-neon",
248	.base.cra_priority = 300,
249	.base.cra_blocksize = 1,
250	.base.cra_ctxsize = sizeof(struct chacha_ctx),
251	.base.cra_module = THIS_MODULE,
252
253	.min_keysize = CHACHA_KEY_SIZE,
254	.max_keysize = CHACHA_KEY_SIZE,
255	.ivsize = CHACHA_IV_SIZE,
256	.chunksize = CHACHA_BLOCK_SIZE,
257	.walksize = 4 * CHACHA_BLOCK_SIZE,
258	.setkey = chacha20_setkey,
259	.encrypt = chacha_neon,
260	.decrypt = chacha_neon,
261	}, {
262	.base.cra_name = "xchacha20",
263	.base.cra_driver_name = "xchacha20-neon",
264	.base.cra_priority = 300,
265	.base.cra_blocksize = 1,
266	.base.cra_ctxsize = sizeof(struct chacha_ctx),
267	.base.cra_module = THIS_MODULE,
268
269	.min_keysize = CHACHA_KEY_SIZE,
270	.max_keysize = CHACHA_KEY_SIZE,
271	.ivsize = XCHACHA_IV_SIZE,
272	.chunksize = CHACHA_BLOCK_SIZE,
273	.walksize = 4 * CHACHA_BLOCK_SIZE,
274	.setkey = chacha20_setkey,
275	.encrypt = xchacha_neon,
276	.decrypt = xchacha_neon,
277	}, {
278	.base.cra_name = "xchacha12",
279	.base.cra_driver_name = "xchacha12-neon",
280	.base.cra_priority = 300,
281	.base.cra_blocksize = 1,
282	.base.cra_ctxsize = sizeof(struct chacha_ctx),
283	.base.cra_module = THIS_MODULE,
284
285	.min_keysize = CHACHA_KEY_SIZE,
286	.max_keysize = CHACHA_KEY_SIZE,
287	.ivsize = XCHACHA_IV_SIZE,
288	.chunksize = CHACHA_BLOCK_SIZE,
289	.walksize = 4 * CHACHA_BLOCK_SIZE,
290	.setkey = chacha12_setkey,
291	.encrypt = xchacha_neon,
292	.decrypt = xchacha_neon,
293	}
294	};
295
296	static int __init chacha_simd_mod_init(void)
297	{
8394bfec	298	int err = 0;
b36d8c09	299
8394bfec JD	300	if (IS_REACHABLE(CONFIG_CRYPTO_SKCIPHER)) {
	301	err = crypto_register_skciphers(arm_algs, ARRAY_SIZE(arm_algs));
	302	if (err)
	303	return err;
	304	}
b36d8c09 AB	305
	306	if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) && (elf_hwcap & HWCAP_NEON)) {
	307	int i;
	308
	309	switch (read_cpuid_part()) {
	310	case ARM_CPU_PART_CORTEX_A7:
	311	case ARM_CPU_PART_CORTEX_A5:
	312	/*
	313	* The Cortex-A7 and Cortex-A5 do not perform well with
	314	* the NEON implementation but do incredibly with the
	315	* scalar one and use less power.
	316	*/
	317	for (i = 0; i < ARRAY_SIZE(neon_algs); i++)
	318	neon_algs[i].base.cra_priority = 0;
	319	break;
a44a3430 AB	320	default:
a44a3430 AB	321	static_branch_enable(&use_neon);
b36d8c09 AB	322	}
b36d8c09 AB	323
8394bfec JD	324	if (IS_REACHABLE(CONFIG_CRYPTO_SKCIPHER)) {
	325	err = crypto_register_skciphers(neon_algs, ARRAY_SIZE(neon_algs));
	326	if (err)
	327	crypto_unregister_skciphers(arm_algs, ARRAY_SIZE(arm_algs));
	328	}
b36d8c09 AB	329	}
	330	return err;
	331	}
	332
	333	static void __exit chacha_simd_mod_fini(void)
	334	{
8394bfec JD	335	if (IS_REACHABLE(CONFIG_CRYPTO_SKCIPHER)) {
	336	crypto_unregister_skciphers(arm_algs, ARRAY_SIZE(arm_algs));
	337	if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) && (elf_hwcap & HWCAP_NEON))
	338	crypto_unregister_skciphers(neon_algs, ARRAY_SIZE(neon_algs));
	339	}
b36d8c09 AB	340	}
	341
	342	module_init(chacha_simd_mod_init);
	343	module_exit(chacha_simd_mod_fini);
	344
	345	MODULE_DESCRIPTION("ChaCha and XChaCha stream ciphers (scalar and NEON accelerated)");
	346	MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
	347	MODULE_LICENSE("GPL v2");
	348	MODULE_ALIAS_CRYPTO("chacha20");
	349	MODULE_ALIAS_CRYPTO("chacha20-arm");
	350	MODULE_ALIAS_CRYPTO("xchacha20");
	351	MODULE_ALIAS_CRYPTO("xchacha20-arm");
	352	MODULE_ALIAS_CRYPTO("xchacha12");
	353	MODULE_ALIAS_CRYPTO("xchacha12-arm");
	354	#ifdef CONFIG_KERNEL_MODE_NEON
	355	MODULE_ALIAS_CRYPTO("chacha20-neon");
	356	MODULE_ALIAS_CRYPTO("xchacha20-neon");
	357	MODULE_ALIAS_CRYPTO("xchacha12-neon");
	358	#endif