[deliverable/linux.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/fpu/api.h>
#include <asm/cpu_device_id.h>

#define GHASH_BLOCK_SIZE	16
#define GHASH_DIGEST_SIZE	16

void clmul_ghash_mul(char *dst, const u128 *shash);

void clmul_ghash_update(char *dst, const char *src, unsigned int srclen,
			const u128 *shash);

struct ghash_async_ctx {
	struct cryptd_ahash *cryptd_tfm;
};

struct ghash_ctx {
	u128 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 = (b << 1) | (a >> 63);
	ctx->shash.b = (a << 1) | (b >> 63);

	if (a >> 63)
		ctx->shash.b ^= ((u64)0xc2) << 56;

	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 |
					  CRYPTO_ALG_INTERNAL,
		.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",
					CRYPTO_ALG_INTERNAL,
					CRYPTO_ALG_INTERNAL);
	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>
df6b35f4	22	#include <asm/fpu/api.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
0ea48146	28	void clmul_ghash_mul(char dst, const u128 shash);
0e1227d3 HY	29
0e1227d3 HY	30	void clmul_ghash_update(char dst, const char src, unsigned int srclen,
0ea48146	31	const u128 *shash);
0e1227d3	32
0e1227d3 HY	33	struct ghash_async_ctx {
	34	struct cryptd_ahash *cryptd_tfm;
	35	};
	36
	37	struct ghash_ctx {
0ea48146	38	u128 shash;
0e1227d3 HY	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);
8ceee728 AB	59	be128 x = (be128 )key;
8ceee728 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
8ceee728 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
0ea48146 HX	71	ctx->shash.a = (b << 1) \| (a >> 63);
0ea48146 HX	72	ctx->shash.b = (a << 1) \| (b >> 63);
8ceee728 AB	73
8ceee728 AB	74	if (a >> 63)
0ea48146	75	ctx->shash.b ^= ((u64)0xc2) << 56;
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,
6a9b52b7 SM	157	.cra_flags = CRYPTO_ALG_TYPE_SHASH \|
6a9b52b7 SM	158	CRYPTO_ALG_INTERNAL,
0e1227d3 HY	159	.cra_blocksize = GHASH_BLOCK_SIZE,
	160	.cra_ctxsize = sizeof(struct ghash_ctx),
	161	.cra_module = THIS_MODULE,
0e1227d3 HY	162	},
	163	};
	164
	165	static int ghash_async_init(struct ahash_request *req)
	166	{
	167	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
	168	struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
	169	struct ahash_request *cryptd_req = ahash_request_ctx(req);
	170	struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm;
	171
01dd9582	172	if (!irq_fpu_usable()) {
0e1227d3 HY	173	memcpy(cryptd_req, req, sizeof(*req));
	174	ahash_request_set_tfm(cryptd_req, &cryptd_tfm->base);
	175	return crypto_ahash_init(cryptd_req);
	176	} else {
	177	struct shash_desc *desc = cryptd_shash_desc(cryptd_req);
	178	struct crypto_shash *child = cryptd_ahash_child(cryptd_tfm);
	179
	180	desc->tfm = child;
	181	desc->flags = req->base.flags;
	182	return crypto_shash_init(desc);
	183	}
	184	}
	185
	186	static int ghash_async_update(struct ahash_request *req)
	187	{
	188	struct ahash_request *cryptd_req = ahash_request_ctx(req);
	189
01dd9582	190	if (!irq_fpu_usable()) {
0e1227d3 HY	191	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
	192	struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
	193	struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm;
	194
	195	memcpy(cryptd_req, req, sizeof(*req));
	196	ahash_request_set_tfm(cryptd_req, &cryptd_tfm->base);
	197	return crypto_ahash_update(cryptd_req);
	198	} else {
	199	struct shash_desc *desc = cryptd_shash_desc(cryptd_req);
	200	return shash_ahash_update(req, desc);
	201	}
	202	}
	203
	204	static int ghash_async_final(struct ahash_request *req)
	205	{
	206	struct ahash_request *cryptd_req = ahash_request_ctx(req);
	207
01dd9582	208	if (!irq_fpu_usable()) {
0e1227d3 HY	209	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
	210	struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
	211	struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm;
	212
	213	memcpy(cryptd_req, req, sizeof(*req));
	214	ahash_request_set_tfm(cryptd_req, &cryptd_tfm->base);
	215	return crypto_ahash_final(cryptd_req);
	216	} else {
	217	struct shash_desc *desc = cryptd_shash_desc(cryptd_req);
	218	return crypto_shash_final(desc, req->result);
	219	}
	220	}
	221
3a020a72 WR	222	static int ghash_async_import(struct ahash_request req, const void in)
	223	{
	224	struct ahash_request *cryptd_req = ahash_request_ctx(req);
	225	struct shash_desc *desc = cryptd_shash_desc(cryptd_req);
	226	struct ghash_desc_ctx *dctx = shash_desc_ctx(desc);
	227
	228	ghash_async_init(req);
	229	memcpy(dctx, in, sizeof(*dctx));
	230	return 0;
	231
	232	}
	233
	234	static int ghash_async_export(struct ahash_request req, void out)
	235	{
	236	struct ahash_request *cryptd_req = ahash_request_ctx(req);
	237	struct shash_desc *desc = cryptd_shash_desc(cryptd_req);
	238	struct ghash_desc_ctx *dctx = shash_desc_ctx(desc);
	239
	240	memcpy(out, dctx, sizeof(*dctx));
	241	return 0;
	242
	243	}
	244
0e1227d3 HY	245	static int ghash_async_digest(struct ahash_request *req)
	246	{
	247	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
	248	struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
	249	struct ahash_request *cryptd_req = ahash_request_ctx(req);
	250	struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm;
	251
01dd9582	252	if (!irq_fpu_usable()) {
0e1227d3 HY	253	memcpy(cryptd_req, req, sizeof(*req));
	254	ahash_request_set_tfm(cryptd_req, &cryptd_tfm->base);
	255	return crypto_ahash_digest(cryptd_req);
	256	} else {
	257	struct shash_desc *desc = cryptd_shash_desc(cryptd_req);
	258	struct crypto_shash *child = cryptd_ahash_child(cryptd_tfm);
	259
	260	desc->tfm = child;
	261	desc->flags = req->base.flags;
	262	return shash_ahash_digest(req, desc);
	263	}
	264	}
	265
	266	static int ghash_async_setkey(struct crypto_ahash tfm, const u8 key,
	267	unsigned int keylen)
	268	{
	269	struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
	270	struct crypto_ahash *child = &ctx->cryptd_tfm->base;
	271	int err;
	272
	273	crypto_ahash_clear_flags(child, CRYPTO_TFM_REQ_MASK);
	274	crypto_ahash_set_flags(child, crypto_ahash_get_flags(tfm)
	275	& CRYPTO_TFM_REQ_MASK);
	276	err = crypto_ahash_setkey(child, key, keylen);
	277	crypto_ahash_set_flags(tfm, crypto_ahash_get_flags(child)
	278	& CRYPTO_TFM_RES_MASK);
	279
c3e73e76	280	return err;
0e1227d3 HY	281	}
	282
	283	static int ghash_async_init_tfm(struct crypto_tfm *tfm)
	284	{
	285	struct cryptd_ahash *cryptd_tfm;
	286	struct ghash_async_ctx *ctx = crypto_tfm_ctx(tfm);
	287
6a9b52b7 SM	288	cryptd_tfm = cryptd_alloc_ahash("__ghash-pclmulqdqni",
	289	CRYPTO_ALG_INTERNAL,
	290	CRYPTO_ALG_INTERNAL);
0e1227d3 HY	291	if (IS_ERR(cryptd_tfm))
	292	return PTR_ERR(cryptd_tfm);
	293	ctx->cryptd_tfm = cryptd_tfm;
	294	crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
	295	sizeof(struct ahash_request) +
	296	crypto_ahash_reqsize(&cryptd_tfm->base));
	297
	298	return 0;
	299	}
	300
	301	static void ghash_async_exit_tfm(struct crypto_tfm *tfm)
	302	{
	303	struct ghash_async_ctx *ctx = crypto_tfm_ctx(tfm);
	304
	305	cryptd_free_ahash(ctx->cryptd_tfm);
	306	}
	307
	308	static struct ahash_alg ghash_async_alg = {
	309	.init = ghash_async_init,
	310	.update = ghash_async_update,
	311	.final = ghash_async_final,
	312	.setkey = ghash_async_setkey,
	313	.digest = ghash_async_digest,
3a020a72 WR	314	.export = ghash_async_export,
3a020a72 WR	315	.import = ghash_async_import,
0e1227d3 HY	316	.halg = {
0e1227d3 HY	317	.digestsize = GHASH_DIGEST_SIZE,
3a020a72	318	.statesize = sizeof(struct ghash_desc_ctx),
0e1227d3 HY	319	.base = {
	320	.cra_name = "ghash",
	321	.cra_driver_name = "ghash-clmulni",
	322	.cra_priority = 400,
71c6da84	323	.cra_ctxsize = sizeof(struct ghash_async_ctx),
0e1227d3 HY	324	.cra_flags = CRYPTO_ALG_TYPE_AHASH \| CRYPTO_ALG_ASYNC,
	325	.cra_blocksize = GHASH_BLOCK_SIZE,
	326	.cra_type = &crypto_ahash_type,
	327	.cra_module = THIS_MODULE,
0e1227d3 HY	328	.cra_init = ghash_async_init_tfm,
	329	.cra_exit = ghash_async_exit_tfm,
	330	},
	331	},
	332	};
	333
3bd391f0 AK	334	static const struct x86_cpu_id pcmul_cpu_id[] = {
	335	X86_FEATURE_MATCH(X86_FEATURE_PCLMULQDQ), /* Pickle-Mickle-Duck */
	336	{}
	337	};
	338	MODULE_DEVICE_TABLE(x86cpu, pcmul_cpu_id);
	339
0e1227d3 HY	340	static int __init ghash_pclmulqdqni_mod_init(void)
	341	{
	342	int err;
	343
3bd391f0	344	if (!x86_match_cpu(pcmul_cpu_id))
0e1227d3	345	return -ENODEV;
0e1227d3 HY	346
	347	err = crypto_register_shash(&ghash_alg);
	348	if (err)
	349	goto err_out;
	350	err = crypto_register_ahash(&ghash_async_alg);
	351	if (err)
	352	goto err_shash;
	353
	354	return 0;
	355
	356	err_shash:
	357	crypto_unregister_shash(&ghash_alg);
	358	err_out:
	359	return err;
	360	}
	361
	362	static void __exit ghash_pclmulqdqni_mod_exit(void)
	363	{
	364	crypto_unregister_ahash(&ghash_async_alg);
	365	crypto_unregister_shash(&ghash_alg);
	366	}
	367
	368	module_init(ghash_pclmulqdqni_mod_init);
	369	module_exit(ghash_pclmulqdqni_mod_exit);
	370
	371	MODULE_LICENSE("GPL");
	372	MODULE_DESCRIPTION("GHASH Message Digest Algorithm, "
	373	"acclerated by PCLMULQDQ-NI");
5d26a105	374	MODULE_ALIAS_CRYPTO("ghash");