[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/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);

void clmul_ghash_setkey(be128 *shash, const u8 *key);

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);

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

	clmul_ghash_setkey(&ctx->shash, key);

	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,
		.cra_list		= LIST_HEAD_INIT(ghash_alg.base.cra_list),
	},
};

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_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,
	.halg = {
		.digestsize	= GHASH_DIGEST_SIZE,
		.base = {
			.cra_name		= "ghash",
			.cra_driver_name	= "ghash-clmulni",
			.cra_priority		= 400,
			.cra_flags		= CRYPTO_ALG_TYPE_AHASH | CRYPTO_ALG_ASYNC,
			.cra_blocksize		= GHASH_BLOCK_SIZE,
			.cra_type		= &crypto_ahash_type,
			.cra_module		= THIS_MODULE,
			.cra_list		= LIST_HEAD_INIT(ghash_async_alg.halg.base.cra_list),
			.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("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
	33	void clmul_ghash_setkey(be128 shash, const u8 key);
	34
	35	struct ghash_async_ctx {
	36	struct cryptd_ahash *cryptd_tfm;
	37	};
	38
	39	struct ghash_ctx {
	40	be128 shash;
	41	};
	42
	43	struct ghash_desc_ctx {
	44	u8 buffer[GHASH_BLOCK_SIZE];
	45	u32 bytes;
	46	};
	47
	48	static int ghash_init(struct shash_desc *desc)
	49	{
	50	struct ghash_desc_ctx *dctx = shash_desc_ctx(desc);
	51
	52	memset(dctx, 0, sizeof(*dctx));
	53
	54	return 0;
	55	}
	56
	57	static int ghash_setkey(struct crypto_shash *tfm,
	58	const u8 *key, unsigned int keylen)
	59	{
	60	struct ghash_ctx *ctx = crypto_shash_ctx(tfm);
	61
	62	if (keylen != GHASH_BLOCK_SIZE) {
	63	crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
	64	return -EINVAL;
	65	}
	66
	67	clmul_ghash_setkey(&ctx->shash, key);
	68
	69	return 0;
	70	}
	71
	72	static int ghash_update(struct shash_desc *desc,
	73	const u8 *src, unsigned int srclen)
	74	{
	75	struct ghash_desc_ctx *dctx = shash_desc_ctx(desc);
	76	struct ghash_ctx *ctx = crypto_shash_ctx(desc->tfm);
	77	u8 *dst = dctx->buffer;
	78
	79	kernel_fpu_begin();
	80	if (dctx->bytes) {
	81	int n = min(srclen, dctx->bytes);
	82	u8 *pos = dst + (GHASH_BLOCK_SIZE - dctx->bytes);
	83
	84	dctx->bytes -= n;
	85	srclen -= n;
	86
	87	while (n--)
88	pos++ ^= src++;
89
90	if (!dctx->bytes)
91	clmul_ghash_mul(dst, &ctx->shash);
92	}
93
94	clmul_ghash_update(dst, src, srclen, &ctx->shash);
95	kernel_fpu_end();
96
97	if (srclen & 0xf) {
98	src += srclen - (srclen & 0xf);
99	srclen &= 0xf;
100	dctx->bytes = GHASH_BLOCK_SIZE - srclen;
101	while (srclen--)
102	dst++ ^= src++;
103	}
104
105	return 0;
106	}
107
108	static void ghash_flush(struct ghash_ctx ctx, struct ghash_desc_ctx dctx)
109	{
110	u8 *dst = dctx->buffer;
111
112	if (dctx->bytes) {
113	u8 *tmp = dst + (GHASH_BLOCK_SIZE - dctx->bytes);
114
115	while (dctx->bytes--)
116	*tmp++ ^= 0;
117
118	kernel_fpu_begin();
119	clmul_ghash_mul(dst, &ctx->shash);
120	kernel_fpu_end();
121	}
122
123	dctx->bytes = 0;
124	}
125
126	static int ghash_final(struct shash_desc desc, u8 dst)
127	{
128	struct ghash_desc_ctx *dctx = shash_desc_ctx(desc);
129	struct ghash_ctx *ctx = crypto_shash_ctx(desc->tfm);
130	u8 *buf = dctx->buffer;
131
132	ghash_flush(ctx, dctx);
133	memcpy(dst, buf, GHASH_BLOCK_SIZE);
134
135	return 0;
136	}
137
138	static struct shash_alg ghash_alg = {
139	.digestsize = GHASH_DIGEST_SIZE,
140	.init = ghash_init,
141	.update = ghash_update,
142	.final = ghash_final,
143	.setkey = ghash_setkey,
144	.descsize = sizeof(struct ghash_desc_ctx),
145	.base = {
146	.cra_name = "__ghash",
147	.cra_driver_name = "__ghash-pclmulqdqni",
148	.cra_priority = 0,
149	.cra_flags = CRYPTO_ALG_TYPE_SHASH,
150	.cra_blocksize = GHASH_BLOCK_SIZE,
151	.cra_ctxsize = sizeof(struct ghash_ctx),
152	.cra_module = THIS_MODULE,
153	.cra_list = LIST_HEAD_INIT(ghash_alg.base.cra_list),
154	},
155	};
156
157	static int ghash_async_init(struct ahash_request *req)
158	{
159	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
160	struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
161	struct ahash_request *cryptd_req = ahash_request_ctx(req);
162	struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm;
163
01dd9582	164	if (!irq_fpu_usable()) {
0e1227d3 HY	165	memcpy(cryptd_req, req, sizeof(*req));
	166	ahash_request_set_tfm(cryptd_req, &cryptd_tfm->base);
	167	return crypto_ahash_init(cryptd_req);
	168	} else {
	169	struct shash_desc *desc = cryptd_shash_desc(cryptd_req);
	170	struct crypto_shash *child = cryptd_ahash_child(cryptd_tfm);
	171
	172	desc->tfm = child;
	173	desc->flags = req->base.flags;
	174	return crypto_shash_init(desc);
	175	}
	176	}
	177
	178	static int ghash_async_update(struct ahash_request *req)
	179	{
	180	struct ahash_request *cryptd_req = ahash_request_ctx(req);
	181
01dd9582	182	if (!irq_fpu_usable()) {
0e1227d3 HY	183	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
	184	struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
	185	struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm;
	186
	187	memcpy(cryptd_req, req, sizeof(*req));
	188	ahash_request_set_tfm(cryptd_req, &cryptd_tfm->base);
	189	return crypto_ahash_update(cryptd_req);
	190	} else {
	191	struct shash_desc *desc = cryptd_shash_desc(cryptd_req);
	192	return shash_ahash_update(req, desc);
	193	}
	194	}
	195
	196	static int ghash_async_final(struct ahash_request *req)
	197	{
	198	struct ahash_request *cryptd_req = ahash_request_ctx(req);
	199
01dd9582	200	if (!irq_fpu_usable()) {
0e1227d3 HY	201	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
	202	struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
	203	struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm;
	204
	205	memcpy(cryptd_req, req, sizeof(*req));
	206	ahash_request_set_tfm(cryptd_req, &cryptd_tfm->base);
	207	return crypto_ahash_final(cryptd_req);
	208	} else {
	209	struct shash_desc *desc = cryptd_shash_desc(cryptd_req);
	210	return crypto_shash_final(desc, req->result);
	211	}
	212	}
	213
	214	static int ghash_async_digest(struct ahash_request *req)
	215	{
	216	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
	217	struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
	218	struct ahash_request *cryptd_req = ahash_request_ctx(req);
	219	struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm;
	220
01dd9582	221	if (!irq_fpu_usable()) {
0e1227d3 HY	222	memcpy(cryptd_req, req, sizeof(*req));
	223	ahash_request_set_tfm(cryptd_req, &cryptd_tfm->base);
	224	return crypto_ahash_digest(cryptd_req);
	225	} else {
	226	struct shash_desc *desc = cryptd_shash_desc(cryptd_req);
	227	struct crypto_shash *child = cryptd_ahash_child(cryptd_tfm);
	228
	229	desc->tfm = child;
	230	desc->flags = req->base.flags;
	231	return shash_ahash_digest(req, desc);
	232	}
	233	}
	234
	235	static int ghash_async_setkey(struct crypto_ahash tfm, const u8 key,
	236	unsigned int keylen)
	237	{
	238	struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
	239	struct crypto_ahash *child = &ctx->cryptd_tfm->base;
	240	int err;
	241
	242	crypto_ahash_clear_flags(child, CRYPTO_TFM_REQ_MASK);
	243	crypto_ahash_set_flags(child, crypto_ahash_get_flags(tfm)
	244	& CRYPTO_TFM_REQ_MASK);
	245	err = crypto_ahash_setkey(child, key, keylen);
	246	crypto_ahash_set_flags(tfm, crypto_ahash_get_flags(child)
	247	& CRYPTO_TFM_RES_MASK);
	248
c3e73e76	249	return err;
0e1227d3 HY	250	}
	251
	252	static int ghash_async_init_tfm(struct crypto_tfm *tfm)
	253	{
	254	struct cryptd_ahash *cryptd_tfm;
	255	struct ghash_async_ctx *ctx = crypto_tfm_ctx(tfm);
	256
	257	cryptd_tfm = cryptd_alloc_ahash("__ghash-pclmulqdqni", 0, 0);
	258	if (IS_ERR(cryptd_tfm))
	259	return PTR_ERR(cryptd_tfm);
	260	ctx->cryptd_tfm = cryptd_tfm;
	261	crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
	262	sizeof(struct ahash_request) +
	263	crypto_ahash_reqsize(&cryptd_tfm->base));
	264
	265	return 0;
	266	}
	267
	268	static void ghash_async_exit_tfm(struct crypto_tfm *tfm)
	269	{
	270	struct ghash_async_ctx *ctx = crypto_tfm_ctx(tfm);
	271
	272	cryptd_free_ahash(ctx->cryptd_tfm);
	273	}
	274
	275	static struct ahash_alg ghash_async_alg = {
	276	.init = ghash_async_init,
	277	.update = ghash_async_update,
	278	.final = ghash_async_final,
	279	.setkey = ghash_async_setkey,
	280	.digest = ghash_async_digest,
	281	.halg = {
	282	.digestsize = GHASH_DIGEST_SIZE,
	283	.base = {
	284	.cra_name = "ghash",
	285	.cra_driver_name = "ghash-clmulni",
	286	.cra_priority = 400,
	287	.cra_flags = CRYPTO_ALG_TYPE_AHASH \| CRYPTO_ALG_ASYNC,
	288	.cra_blocksize = GHASH_BLOCK_SIZE,
	289	.cra_type = &crypto_ahash_type,
	290	.cra_module = THIS_MODULE,
	291	.cra_list = LIST_HEAD_INIT(ghash_async_alg.halg.base.cra_list),
	292	.cra_init = ghash_async_init_tfm,
	293	.cra_exit = ghash_async_exit_tfm,
	294	},
	295	},
	296	};
	297
3bd391f0 AK	298	static const struct x86_cpu_id pcmul_cpu_id[] = {
	299	X86_FEATURE_MATCH(X86_FEATURE_PCLMULQDQ), /* Pickle-Mickle-Duck */
	300	{}
	301	};
	302	MODULE_DEVICE_TABLE(x86cpu, pcmul_cpu_id);
	303
0e1227d3 HY	304	static int __init ghash_pclmulqdqni_mod_init(void)
	305	{
	306	int err;
	307
3bd391f0	308	if (!x86_match_cpu(pcmul_cpu_id))
0e1227d3	309	return -ENODEV;
0e1227d3 HY	310
	311	err = crypto_register_shash(&ghash_alg);
	312	if (err)
	313	goto err_out;
	314	err = crypto_register_ahash(&ghash_async_alg);
	315	if (err)
	316	goto err_shash;
	317
	318	return 0;
	319
	320	err_shash:
	321	crypto_unregister_shash(&ghash_alg);
	322	err_out:
	323	return err;
	324	}
	325
	326	static void __exit ghash_pclmulqdqni_mod_exit(void)
	327	{
	328	crypto_unregister_ahash(&ghash_async_alg);
	329	crypto_unregister_shash(&ghash_alg);
	330	}
	331
	332	module_init(ghash_pclmulqdqni_mod_init);
	333	module_exit(ghash_pclmulqdqni_mod_exit);
	334
	335	MODULE_LICENSE("GPL");
	336	MODULE_DESCRIPTION("GHASH Message Digest Algorithm, "
	337	"acclerated by PCLMULQDQ-NI");
	338	MODULE_ALIAS("ghash");