[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / x86 / crypto / ghash-clmulni-intel_glue.c

/*
 * Accelerated GHASH implementation with Intel PCLMULQDQ-NI
 * instructions. This file contains glue code.
 *
 * Copyright (c) 2009 Intel Corp.
 *   Author: Huang Ying <ying.huang@intel.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published
 * by the Free Software Foundation.
 */

#include <linux/err.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/crypto.h>
#include <crypto/algapi.h>
#include <crypto/cryptd.h>
#include <crypto/gf128mul.h>
#include <crypto/internal/hash.h>
#include <asm/i387.h>
#include <asm/cpu_device_id.h>

#define GHASH_BLOCK_SIZE	16
#define GHASH_DIGEST_SIZE	16

void clmul_ghash_mul(char *dst, const be128 *shash);

void clmul_ghash_update(char *dst, const char *src, unsigned int srclen,
			const be128 *shash);

struct ghash_async_ctx {
	struct cryptd_ahash *cryptd_tfm;
};

struct ghash_ctx {
	be128 shash;
};

struct ghash_desc_ctx {
	u8 buffer[GHASH_BLOCK_SIZE];
	u32 bytes;
};

static int ghash_init(struct shash_desc *desc)
{
	struct ghash_desc_ctx *dctx = shash_desc_ctx(desc);

	memset(dctx, 0, sizeof(*dctx));

	return 0;
}

static int ghash_setkey(struct crypto_shash *tfm,
			const u8 *key, unsigned int keylen)
{
	struct ghash_ctx *ctx = crypto_shash_ctx(tfm);
	be128 *x = (be128 *)key;
	u64 a, b;

	if (keylen != GHASH_BLOCK_SIZE) {
		crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
		return -EINVAL;
	}

	/* perform multiplication by 'x' in GF(2^128) */
	a = be64_to_cpu(x->a);
	b = be64_to_cpu(x->b);

	ctx->shash.a = (__be64)((b << 1) | (a >> 63));
	ctx->shash.b = (__be64)((a << 1) | (b >> 63));

	if (a >> 63)
		ctx->shash.b ^= cpu_to_be64(0xc2);

	return 0;
}

static int ghash_update(struct shash_desc *desc,
			 const u8 *src, unsigned int srclen)
{
	struct ghash_desc_ctx *dctx = shash_desc_ctx(desc);
	struct ghash_ctx *ctx = crypto_shash_ctx(desc->tfm);
	u8 *dst = dctx->buffer;

	kernel_fpu_begin();
	if (dctx->bytes) {
		int n = min(srclen, dctx->bytes);
		u8 *pos = dst + (GHASH_BLOCK_SIZE - dctx->bytes);

		dctx->bytes -= n;
		srclen -= n;

		while (n--)
			*pos++ ^= *src++;

		if (!dctx->bytes)
			clmul_ghash_mul(dst, &ctx->shash);
	}

	clmul_ghash_update(dst, src, srclen, &ctx->shash);
	kernel_fpu_end();

	if (srclen & 0xf) {
		src += srclen - (srclen & 0xf);
		srclen &= 0xf;
		dctx->bytes = GHASH_BLOCK_SIZE - srclen;
		while (srclen--)
			*dst++ ^= *src++;
	}

	return 0;
}

static void ghash_flush(struct ghash_ctx *ctx, struct ghash_desc_ctx *dctx)
{
	u8 *dst = dctx->buffer;

	if (dctx->bytes) {
		u8 *tmp = dst + (GHASH_BLOCK_SIZE - dctx->bytes);

		while (dctx->bytes--)
			*tmp++ ^= 0;

		kernel_fpu_begin();
		clmul_ghash_mul(dst, &ctx->shash);
		kernel_fpu_end();
	}

	dctx->bytes = 0;
}

static int ghash_final(struct shash_desc *desc, u8 *dst)
{
	struct ghash_desc_ctx *dctx = shash_desc_ctx(desc);
	struct ghash_ctx *ctx = crypto_shash_ctx(desc->tfm);
	u8 *buf = dctx->buffer;

	ghash_flush(ctx, dctx);
	memcpy(dst, buf, GHASH_BLOCK_SIZE);

	return 0;
}

static struct shash_alg ghash_alg = {
	.digestsize	= GHASH_DIGEST_SIZE,
	.init		= ghash_init,
	.update		= ghash_update,
	.final		= ghash_final,
	.setkey		= ghash_setkey,
	.descsize	= sizeof(struct ghash_desc_ctx),
	.base		= {
		.cra_name		= "__ghash",
		.cra_driver_name	= "__ghash-pclmulqdqni",
		.cra_priority		= 0,
		.cra_flags		= CRYPTO_ALG_TYPE_SHASH,
		.cra_blocksize		= GHASH_BLOCK_SIZE,
		.cra_ctxsize		= sizeof(struct ghash_ctx),
		.cra_module		= THIS_MODULE,
	},
};

static int ghash_async_init(struct ahash_request *req)
{
	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
	struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
	struct ahash_request *cryptd_req = ahash_request_ctx(req);
	struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm;

	if (!irq_fpu_usable()) {
		memcpy(cryptd_req, req, sizeof(*req));
		ahash_request_set_tfm(cryptd_req, &cryptd_tfm->base);
		return crypto_ahash_init(cryptd_req);
	} else {
		struct shash_desc *desc = cryptd_shash_desc(cryptd_req);
		struct crypto_shash *child = cryptd_ahash_child(cryptd_tfm);

		desc->tfm = child;
		desc->flags = req->base.flags;
		return crypto_shash_init(desc);
	}
}

static int ghash_async_update(struct ahash_request *req)
{
	struct ahash_request *cryptd_req = ahash_request_ctx(req);

	if (!irq_fpu_usable()) {
		struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
		struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
		struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm;

		memcpy(cryptd_req, req, sizeof(*req));
		ahash_request_set_tfm(cryptd_req, &cryptd_tfm->base);
		return crypto_ahash_update(cryptd_req);
	} else {
		struct shash_desc *desc = cryptd_shash_desc(cryptd_req);
		return shash_ahash_update(req, desc);
	}
}

static int ghash_async_final(struct ahash_request *req)
{
	struct ahash_request *cryptd_req = ahash_request_ctx(req);

	if (!irq_fpu_usable()) {
		struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
		struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
		struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm;

		memcpy(cryptd_req, req, sizeof(*req));
		ahash_request_set_tfm(cryptd_req, &cryptd_tfm->base);
		return crypto_ahash_final(cryptd_req);
	} else {
		struct shash_desc *desc = cryptd_shash_desc(cryptd_req);
		return crypto_shash_final(desc, req->result);
	}
}

static int ghash_async_import(struct ahash_request *req, const void *in)
{
	struct ahash_request *cryptd_req = ahash_request_ctx(req);
	struct shash_desc *desc = cryptd_shash_desc(cryptd_req);
	struct ghash_desc_ctx *dctx = shash_desc_ctx(desc);

	ghash_async_init(req);
	memcpy(dctx, in, sizeof(*dctx));
	return 0;

}

static int ghash_async_export(struct ahash_request *req, void *out)
{
	struct ahash_request *cryptd_req = ahash_request_ctx(req);
	struct shash_desc *desc = cryptd_shash_desc(cryptd_req);
	struct ghash_desc_ctx *dctx = shash_desc_ctx(desc);

	memcpy(out, dctx, sizeof(*dctx));
	return 0;

}

static int ghash_async_digest(struct ahash_request *req)
{
	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
	struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
	struct ahash_request *cryptd_req = ahash_request_ctx(req);
	struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm;

	if (!irq_fpu_usable()) {
		memcpy(cryptd_req, req, sizeof(*req));
		ahash_request_set_tfm(cryptd_req, &cryptd_tfm->base);
		return crypto_ahash_digest(cryptd_req);
	} else {
		struct shash_desc *desc = cryptd_shash_desc(cryptd_req);
		struct crypto_shash *child = cryptd_ahash_child(cryptd_tfm);

		desc->tfm = child;
		desc->flags = req->base.flags;
		return shash_ahash_digest(req, desc);
	}
}

static int ghash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
			      unsigned int keylen)
{
	struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
	struct crypto_ahash *child = &ctx->cryptd_tfm->base;
	int err;

	crypto_ahash_clear_flags(child, CRYPTO_TFM_REQ_MASK);
	crypto_ahash_set_flags(child, crypto_ahash_get_flags(tfm)
			       & CRYPTO_TFM_REQ_MASK);
	err = crypto_ahash_setkey(child, key, keylen);
	crypto_ahash_set_flags(tfm, crypto_ahash_get_flags(child)
			       & CRYPTO_TFM_RES_MASK);

	return err;
}

static int ghash_async_init_tfm(struct crypto_tfm *tfm)
{
	struct cryptd_ahash *cryptd_tfm;
	struct ghash_async_ctx *ctx = crypto_tfm_ctx(tfm);

	cryptd_tfm = cryptd_alloc_ahash("__ghash-pclmulqdqni", 0, 0);
	if (IS_ERR(cryptd_tfm))
		return PTR_ERR(cryptd_tfm);
	ctx->cryptd_tfm = cryptd_tfm;
	crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
				 sizeof(struct ahash_request) +
				 crypto_ahash_reqsize(&cryptd_tfm->base));

	return 0;
}

static void ghash_async_exit_tfm(struct crypto_tfm *tfm)
{
	struct ghash_async_ctx *ctx = crypto_tfm_ctx(tfm);

	cryptd_free_ahash(ctx->cryptd_tfm);
}

static struct ahash_alg ghash_async_alg = {
	.init		= ghash_async_init,
	.update		= ghash_async_update,
	.final		= ghash_async_final,
	.setkey		= ghash_async_setkey,
	.digest		= ghash_async_digest,
	.export		= ghash_async_export,
	.import		= ghash_async_import,
	.halg = {
		.digestsize	= GHASH_DIGEST_SIZE,
		.statesize = sizeof(struct ghash_desc_ctx),
		.base = {
			.cra_name		= "ghash",
			.cra_driver_name	= "ghash-clmulni",
			.cra_priority		= 400,
			.cra_ctxsize		= sizeof(struct ghash_async_ctx),
			.cra_flags		= CRYPTO_ALG_TYPE_AHASH | CRYPTO_ALG_ASYNC,
			.cra_blocksize		= GHASH_BLOCK_SIZE,
			.cra_type		= &crypto_ahash_type,
			.cra_module		= THIS_MODULE,
			.cra_init		= ghash_async_init_tfm,
			.cra_exit		= ghash_async_exit_tfm,
		},
	},
};

static const struct x86_cpu_id pcmul_cpu_id[] = {
	X86_FEATURE_MATCH(X86_FEATURE_PCLMULQDQ), /* Pickle-Mickle-Duck */
	{}
};
MODULE_DEVICE_TABLE(x86cpu, pcmul_cpu_id);

static int __init ghash_pclmulqdqni_mod_init(void)
{
	int err;

	if (!x86_match_cpu(pcmul_cpu_id))
		return -ENODEV;

	err = crypto_register_shash(&ghash_alg);
	if (err)
		goto err_out;
	err = crypto_register_ahash(&ghash_async_alg);
	if (err)
		goto err_shash;

	return 0;

err_shash:
	crypto_unregister_shash(&ghash_alg);
err_out:
	return err;
}

static void __exit ghash_pclmulqdqni_mod_exit(void)
{
	crypto_unregister_ahash(&ghash_async_alg);
	crypto_unregister_shash(&ghash_alg);
}

module_init(ghash_pclmulqdqni_mod_init);
module_exit(ghash_pclmulqdqni_mod_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("GHASH Message Digest Algorithm, "
		   "acclerated by PCLMULQDQ-NI");
MODULE_ALIAS_CRYPTO("ghash");
Commit	Line	Data
0e1227d3 HY	1	/*
	2	* Accelerated GHASH implementation with Intel PCLMULQDQ-NI
	3	* instructions. This file contains glue code.
	4	*
	5	* Copyright (c) 2009 Intel Corp.
	6	* Author: Huang Ying <ying.huang@intel.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify it
	9	* under the terms of the GNU General Public License version 2 as published
	10	* by the Free Software Foundation.
	11	*/
	12
52f6c5ad	13	#include <linux/err.h>
0e1227d3 HY	14	#include <linux/module.h>
	15	#include <linux/init.h>
	16	#include <linux/kernel.h>
	17	#include <linux/crypto.h>
	18	#include <crypto/algapi.h>
	19	#include <crypto/cryptd.h>
	20	#include <crypto/gf128mul.h>
	21	#include <crypto/internal/hash.h>
	22	#include <asm/i387.h>
3bd391f0	23	#include <asm/cpu_device_id.h>
0e1227d3 HY	24
	25	#define GHASH_BLOCK_SIZE 16
	26	#define GHASH_DIGEST_SIZE 16
	27
	28	void clmul_ghash_mul(char dst, const be128 shash);
	29
	30	void clmul_ghash_update(char dst, const char src, unsigned int srclen,
	31	const be128 *shash);
	32
0e1227d3 HY	33	struct ghash_async_ctx {
	34	struct cryptd_ahash *cryptd_tfm;
	35	};
	36
	37	struct ghash_ctx {
	38	be128 shash;
	39	};
	40
	41	struct ghash_desc_ctx {
	42	u8 buffer[GHASH_BLOCK_SIZE];
	43	u32 bytes;
	44	};
	45
	46	static int ghash_init(struct shash_desc *desc)
	47	{
	48	struct ghash_desc_ctx *dctx = shash_desc_ctx(desc);
	49
	50	memset(dctx, 0, sizeof(*dctx));
	51
	52	return 0;
	53	}
	54
	55	static int ghash_setkey(struct crypto_shash *tfm,
	56	const u8 *key, unsigned int keylen)
	57	{
	58	struct ghash_ctx *ctx = crypto_shash_ctx(tfm);
87f93ce8 AB	59	be128 x = (be128 )key;
87f93ce8 AB	60	u64 a, b;
0e1227d3 HY	61
	62	if (keylen != GHASH_BLOCK_SIZE) {
	63	crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
	64	return -EINVAL;
	65	}
	66
87f93ce8 AB	67	/* perform multiplication by 'x' in GF(2^128) */
	68	a = be64_to_cpu(x->a);
	69	b = be64_to_cpu(x->b);
	70
	71	ctx->shash.a = (__be64)((b << 1) \| (a >> 63));
	72	ctx->shash.b = (__be64)((a << 1) \| (b >> 63));
	73
	74	if (a >> 63)
	75	ctx->shash.b ^= cpu_to_be64(0xc2);
0e1227d3 HY	76
	77	return 0;
	78	}
	79
	80	static int ghash_update(struct shash_desc *desc,
	81	const u8 *src, unsigned int srclen)
	82	{
	83	struct ghash_desc_ctx *dctx = shash_desc_ctx(desc);
	84	struct ghash_ctx *ctx = crypto_shash_ctx(desc->tfm);
	85	u8 *dst = dctx->buffer;
	86
	87	kernel_fpu_begin();
	88	if (dctx->bytes) {
	89	int n = min(srclen, dctx->bytes);
	90	u8 *pos = dst + (GHASH_BLOCK_SIZE - dctx->bytes);
	91
	92	dctx->bytes -= n;
	93	srclen -= n;
	94
	95	while (n--)
	96	pos++ ^= src++;
	97
	98	if (!dctx->bytes)
	99	clmul_ghash_mul(dst, &ctx->shash);
	100	}
	101
	102	clmul_ghash_update(dst, src, srclen, &ctx->shash);
	103	kernel_fpu_end();
	104
	105	if (srclen & 0xf) {
	106	src += srclen - (srclen & 0xf);
	107	srclen &= 0xf;
	108	dctx->bytes = GHASH_BLOCK_SIZE - srclen;
	109	while (srclen--)
	110	dst++ ^= src++;
	111	}
	112
	113	return 0;
	114	}
	115
	116	static void ghash_flush(struct ghash_ctx ctx, struct ghash_desc_ctx dctx)
	117	{
	118	u8 *dst = dctx->buffer;
	119
	120	if (dctx->bytes) {
	121	u8 *tmp = dst + (GHASH_BLOCK_SIZE - dctx->bytes);
	122
	123	while (dctx->bytes--)
	124	*tmp++ ^= 0;
	125
	126	kernel_fpu_begin();
	127	clmul_ghash_mul(dst, &ctx->shash);
	128	kernel_fpu_end();
	129	}
	130
	131	dctx->bytes = 0;
	132	}
	133
	134	static int ghash_final(struct shash_desc desc, u8 dst)
	135	{
	136	struct ghash_desc_ctx *dctx = shash_desc_ctx(desc);
	137	struct ghash_ctx *ctx = crypto_shash_ctx(desc->tfm);
	138	u8 *buf = dctx->buffer;
	139
140	ghash_flush(ctx, dctx);
141	memcpy(dst, buf, GHASH_BLOCK_SIZE);
142
143	return 0;
144	}
145
146	static struct shash_alg ghash_alg = {
147	.digestsize = GHASH_DIGEST_SIZE,
148	.init = ghash_init,
149	.update = ghash_update,
150	.final = ghash_final,
151	.setkey = ghash_setkey,
152	.descsize = sizeof(struct ghash_desc_ctx),
153	.base = {
154	.cra_name = "__ghash",
155	.cra_driver_name = "__ghash-pclmulqdqni",
156	.cra_priority = 0,
157	.cra_flags = CRYPTO_ALG_TYPE_SHASH,
158	.cra_blocksize = GHASH_BLOCK_SIZE,
159	.cra_ctxsize = sizeof(struct ghash_ctx),
160	.cra_module = THIS_MODULE,
0e1227d3 HY	161	},
	162	};
	163
	164	static int ghash_async_init(struct ahash_request *req)
	165	{
	166	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
	167	struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
	168	struct ahash_request *cryptd_req = ahash_request_ctx(req);
	169	struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm;
	170
01dd9582	171	if (!irq_fpu_usable()) {
0e1227d3 HY	172	memcpy(cryptd_req, req, sizeof(*req));
	173	ahash_request_set_tfm(cryptd_req, &cryptd_tfm->base);
	174	return crypto_ahash_init(cryptd_req);
	175	} else {
	176	struct shash_desc *desc = cryptd_shash_desc(cryptd_req);
	177	struct crypto_shash *child = cryptd_ahash_child(cryptd_tfm);
	178
	179	desc->tfm = child;
	180	desc->flags = req->base.flags;
	181	return crypto_shash_init(desc);
	182	}
	183	}
	184
	185	static int ghash_async_update(struct ahash_request *req)
	186	{
	187	struct ahash_request *cryptd_req = ahash_request_ctx(req);
	188
01dd9582	189	if (!irq_fpu_usable()) {
0e1227d3 HY	190	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
	191	struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
	192	struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm;
	193
	194	memcpy(cryptd_req, req, sizeof(*req));
	195	ahash_request_set_tfm(cryptd_req, &cryptd_tfm->base);
	196	return crypto_ahash_update(cryptd_req);
	197	} else {
	198	struct shash_desc *desc = cryptd_shash_desc(cryptd_req);
	199	return shash_ahash_update(req, desc);
	200	}
	201	}
	202
	203	static int ghash_async_final(struct ahash_request *req)
	204	{
	205	struct ahash_request *cryptd_req = ahash_request_ctx(req);
	206
01dd9582	207	if (!irq_fpu_usable()) {
0e1227d3 HY	208	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
	209	struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
	210	struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm;
	211
	212	memcpy(cryptd_req, req, sizeof(*req));
	213	ahash_request_set_tfm(cryptd_req, &cryptd_tfm->base);
	214	return crypto_ahash_final(cryptd_req);
	215	} else {
	216	struct shash_desc *desc = cryptd_shash_desc(cryptd_req);
	217	return crypto_shash_final(desc, req->result);
	218	}
	219	}
	220
4324a47c WR	221	static int ghash_async_import(struct ahash_request req, const void in)
	222	{
	223	struct ahash_request *cryptd_req = ahash_request_ctx(req);
	224	struct shash_desc *desc = cryptd_shash_desc(cryptd_req);
	225	struct ghash_desc_ctx *dctx = shash_desc_ctx(desc);
	226
	227	ghash_async_init(req);
	228	memcpy(dctx, in, sizeof(*dctx));
	229	return 0;
	230
	231	}
	232
	233	static int ghash_async_export(struct ahash_request req, void out)
	234	{
	235	struct ahash_request *cryptd_req = ahash_request_ctx(req);
	236	struct shash_desc *desc = cryptd_shash_desc(cryptd_req);
	237	struct ghash_desc_ctx *dctx = shash_desc_ctx(desc);
	238
	239	memcpy(out, dctx, sizeof(*dctx));
	240	return 0;
	241
	242	}
	243
0e1227d3 HY	244	static int ghash_async_digest(struct ahash_request *req)
	245	{
	246	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
	247	struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
	248	struct ahash_request *cryptd_req = ahash_request_ctx(req);
	249	struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm;
	250
01dd9582	251	if (!irq_fpu_usable()) {
0e1227d3 HY	252	memcpy(cryptd_req, req, sizeof(*req));
	253	ahash_request_set_tfm(cryptd_req, &cryptd_tfm->base);
	254	return crypto_ahash_digest(cryptd_req);
	255	} else {
	256	struct shash_desc *desc = cryptd_shash_desc(cryptd_req);
	257	struct crypto_shash *child = cryptd_ahash_child(cryptd_tfm);
	258
	259	desc->tfm = child;
	260	desc->flags = req->base.flags;
	261	return shash_ahash_digest(req, desc);
	262	}
	263	}
	264
	265	static int ghash_async_setkey(struct crypto_ahash tfm, const u8 key,
	266	unsigned int keylen)
	267	{
	268	struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
	269	struct crypto_ahash *child = &ctx->cryptd_tfm->base;
	270	int err;
	271
	272	crypto_ahash_clear_flags(child, CRYPTO_TFM_REQ_MASK);
	273	crypto_ahash_set_flags(child, crypto_ahash_get_flags(tfm)
	274	& CRYPTO_TFM_REQ_MASK);
	275	err = crypto_ahash_setkey(child, key, keylen);
	276	crypto_ahash_set_flags(tfm, crypto_ahash_get_flags(child)
	277	& CRYPTO_TFM_RES_MASK);
	278
c3e73e76	279	return err;
0e1227d3 HY	280	}
	281
	282	static int ghash_async_init_tfm(struct crypto_tfm *tfm)
	283	{
	284	struct cryptd_ahash *cryptd_tfm;
	285	struct ghash_async_ctx *ctx = crypto_tfm_ctx(tfm);
	286
	287	cryptd_tfm = cryptd_alloc_ahash("__ghash-pclmulqdqni", 0, 0);
	288	if (IS_ERR(cryptd_tfm))
	289	return PTR_ERR(cryptd_tfm);
	290	ctx->cryptd_tfm = cryptd_tfm;
	291	crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
	292	sizeof(struct ahash_request) +
	293	crypto_ahash_reqsize(&cryptd_tfm->base));
	294
	295	return 0;
	296	}
	297
	298	static void ghash_async_exit_tfm(struct crypto_tfm *tfm)
	299	{
	300	struct ghash_async_ctx *ctx = crypto_tfm_ctx(tfm);
	301
	302	cryptd_free_ahash(ctx->cryptd_tfm);
	303	}
	304
	305	static struct ahash_alg ghash_async_alg = {
	306	.init = ghash_async_init,
	307	.update = ghash_async_update,
	308	.final = ghash_async_final,
	309	.setkey = ghash_async_setkey,
	310	.digest = ghash_async_digest,
4324a47c WR	311	.export = ghash_async_export,
4324a47c WR	312	.import = ghash_async_import,
0e1227d3 HY	313	.halg = {
0e1227d3 HY	314	.digestsize = GHASH_DIGEST_SIZE,
4324a47c	315	.statesize = sizeof(struct ghash_desc_ctx),
0e1227d3 HY	316	.base = {
	317	.cra_name = "ghash",
	318	.cra_driver_name = "ghash-clmulni",
	319	.cra_priority = 400,
e56ecbcc	320	.cra_ctxsize = sizeof(struct ghash_async_ctx),
0e1227d3 HY	321	.cra_flags = CRYPTO_ALG_TYPE_AHASH \| CRYPTO_ALG_ASYNC,
	322	.cra_blocksize = GHASH_BLOCK_SIZE,
	323	.cra_type = &crypto_ahash_type,
	324	.cra_module = THIS_MODULE,
0e1227d3 HY	325	.cra_init = ghash_async_init_tfm,
	326	.cra_exit = ghash_async_exit_tfm,
	327	},
	328	},
	329	};
	330
3bd391f0 AK	331	static const struct x86_cpu_id pcmul_cpu_id[] = {
	332	X86_FEATURE_MATCH(X86_FEATURE_PCLMULQDQ), /* Pickle-Mickle-Duck */
	333	{}
	334	};
	335	MODULE_DEVICE_TABLE(x86cpu, pcmul_cpu_id);
	336
0e1227d3 HY	337	static int __init ghash_pclmulqdqni_mod_init(void)
	338	{
	339	int err;
	340
3bd391f0	341	if (!x86_match_cpu(pcmul_cpu_id))
0e1227d3	342	return -ENODEV;
0e1227d3 HY	343
	344	err = crypto_register_shash(&ghash_alg);
	345	if (err)
	346	goto err_out;
	347	err = crypto_register_ahash(&ghash_async_alg);
	348	if (err)
	349	goto err_shash;
	350
	351	return 0;
	352
	353	err_shash:
	354	crypto_unregister_shash(&ghash_alg);
	355	err_out:
	356	return err;
	357	}
	358
	359	static void __exit ghash_pclmulqdqni_mod_exit(void)
	360	{
	361	crypto_unregister_ahash(&ghash_async_alg);
	362	crypto_unregister_shash(&ghash_alg);
	363	}
	364
	365	module_init(ghash_pclmulqdqni_mod_init);
	366	module_exit(ghash_pclmulqdqni_mod_exit);
	367
	368	MODULE_LICENSE("GPL");
	369	MODULE_DESCRIPTION("GHASH Message Digest Algorithm, "
	370	"acclerated by PCLMULQDQ-NI");
e635e0d5	371	MODULE_ALIAS_CRYPTO("ghash");