[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/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>

#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 0;
}

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 int __init ghash_pclmulqdqni_mod_init(void)
{
	int err;

	if (!cpu_has_pclmulqdq) {
		printk(KERN_INFO "Intel PCLMULQDQ-NI instructions are not"
		       " detected.\n");
		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
	13	#include <linux/module.h>
	14	#include <linux/init.h>
	15	#include <linux/kernel.h>
	16	#include <linux/crypto.h>
	17	#include <crypto/algapi.h>
	18	#include <crypto/cryptd.h>
	19	#include <crypto/gf128mul.h>
	20	#include <crypto/internal/hash.h>
	21	#include <asm/i387.h>
	22
	23	#define GHASH_BLOCK_SIZE 16
	24	#define GHASH_DIGEST_SIZE 16
	25
	26	void clmul_ghash_mul(char dst, const be128 shash);
	27
	28	void clmul_ghash_update(char dst, const char src, unsigned int srclen,
	29	const be128 *shash);
	30
	31	void clmul_ghash_setkey(be128 shash, const u8 key);
	32
	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);
	59
	60	if (keylen != GHASH_BLOCK_SIZE) {
	61	crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
	62	return -EINVAL;
	63	}
	64
65	clmul_ghash_setkey(&ctx->shash, key);
66
67	return 0;
68	}
69
70	static int ghash_update(struct shash_desc *desc,
71	const u8 *src, unsigned int srclen)
72	{
73	struct ghash_desc_ctx *dctx = shash_desc_ctx(desc);
74	struct ghash_ctx *ctx = crypto_shash_ctx(desc->tfm);
75	u8 *dst = dctx->buffer;
76
77	kernel_fpu_begin();
78	if (dctx->bytes) {
79	int n = min(srclen, dctx->bytes);
80	u8 *pos = dst + (GHASH_BLOCK_SIZE - dctx->bytes);
81
82	dctx->bytes -= n;
83	srclen -= n;
84
85	while (n--)
86	pos++ ^= src++;
87
88	if (!dctx->bytes)
89	clmul_ghash_mul(dst, &ctx->shash);
90	}
91
92	clmul_ghash_update(dst, src, srclen, &ctx->shash);
93	kernel_fpu_end();
94
95	if (srclen & 0xf) {
96	src += srclen - (srclen & 0xf);
97	srclen &= 0xf;
98	dctx->bytes = GHASH_BLOCK_SIZE - srclen;
99	while (srclen--)
100	dst++ ^= src++;
101	}
102
103	return 0;
104	}
105
106	static void ghash_flush(struct ghash_ctx ctx, struct ghash_desc_ctx dctx)
107	{
108	u8 *dst = dctx->buffer;
109
110	if (dctx->bytes) {
111	u8 *tmp = dst + (GHASH_BLOCK_SIZE - dctx->bytes);
112
113	while (dctx->bytes--)
114	*tmp++ ^= 0;
115
116	kernel_fpu_begin();
117	clmul_ghash_mul(dst, &ctx->shash);
118	kernel_fpu_end();
119	}
120
121	dctx->bytes = 0;
122	}
123
124	static int ghash_final(struct shash_desc desc, u8 dst)
125	{
126	struct ghash_desc_ctx *dctx = shash_desc_ctx(desc);
127	struct ghash_ctx *ctx = crypto_shash_ctx(desc->tfm);
128	u8 *buf = dctx->buffer;
129
130	ghash_flush(ctx, dctx);
131	memcpy(dst, buf, GHASH_BLOCK_SIZE);
132
133	return 0;
134	}
135
136	static struct shash_alg ghash_alg = {
137	.digestsize = GHASH_DIGEST_SIZE,
138	.init = ghash_init,
139	.update = ghash_update,
140	.final = ghash_final,
141	.setkey = ghash_setkey,
142	.descsize = sizeof(struct ghash_desc_ctx),
143	.base = {
144	.cra_name = "__ghash",
145	.cra_driver_name = "__ghash-pclmulqdqni",
146	.cra_priority = 0,
147	.cra_flags = CRYPTO_ALG_TYPE_SHASH,
148	.cra_blocksize = GHASH_BLOCK_SIZE,
149	.cra_ctxsize = sizeof(struct ghash_ctx),
150	.cra_module = THIS_MODULE,
151	.cra_list = LIST_HEAD_INIT(ghash_alg.base.cra_list),
152	},
153	};
154
155	static int ghash_async_init(struct ahash_request *req)
156	{
157	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
158	struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
159	struct ahash_request *cryptd_req = ahash_request_ctx(req);
160	struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm;
161
162	if (irq_fpu_usable()) {
163	memcpy(cryptd_req, req, sizeof(*req));
164	ahash_request_set_tfm(cryptd_req, &cryptd_tfm->base);
165	return crypto_ahash_init(cryptd_req);
166	} else {
167	struct shash_desc *desc = cryptd_shash_desc(cryptd_req);
168	struct crypto_shash *child = cryptd_ahash_child(cryptd_tfm);
169
170	desc->tfm = child;
171	desc->flags = req->base.flags;
172	return crypto_shash_init(desc);
173	}
174	}
175
176	static int ghash_async_update(struct ahash_request *req)
177	{
178	struct ahash_request *cryptd_req = ahash_request_ctx(req);
179
180	if (irq_fpu_usable()) {
181	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
182	struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
183	struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm;
184
185	memcpy(cryptd_req, req, sizeof(*req));
186	ahash_request_set_tfm(cryptd_req, &cryptd_tfm->base);
187	return crypto_ahash_update(cryptd_req);
188	} else {
189	struct shash_desc *desc = cryptd_shash_desc(cryptd_req);
190	return shash_ahash_update(req, desc);
191	}
192	}
193
194	static int ghash_async_final(struct ahash_request *req)
195	{
196	struct ahash_request *cryptd_req = ahash_request_ctx(req);
197
198	if (irq_fpu_usable()) {
199	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
200	struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
201	struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm;
202
203	memcpy(cryptd_req, req, sizeof(*req));
204	ahash_request_set_tfm(cryptd_req, &cryptd_tfm->base);
205	return crypto_ahash_final(cryptd_req);
206	} else {
207	struct shash_desc *desc = cryptd_shash_desc(cryptd_req);
208	return crypto_shash_final(desc, req->result);
209	}
210	}
211
212	static int ghash_async_digest(struct ahash_request *req)
213	{
214	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
215	struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
216	struct ahash_request *cryptd_req = ahash_request_ctx(req);
217	struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm;
218
219	if (irq_fpu_usable()) {
220	memcpy(cryptd_req, req, sizeof(*req));
221	ahash_request_set_tfm(cryptd_req, &cryptd_tfm->base);
222	return crypto_ahash_digest(cryptd_req);
223	} else {
224	struct shash_desc *desc = cryptd_shash_desc(cryptd_req);
225	struct crypto_shash *child = cryptd_ahash_child(cryptd_tfm);
226
227	desc->tfm = child;
228	desc->flags = req->base.flags;
229	return shash_ahash_digest(req, desc);
230	}
231	}
232
233	static int ghash_async_setkey(struct crypto_ahash tfm, const u8 key,
234	unsigned int keylen)
235	{
236	struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
237	struct crypto_ahash *child = &ctx->cryptd_tfm->base;
238	int err;
239
240	crypto_ahash_clear_flags(child, CRYPTO_TFM_REQ_MASK);
241	crypto_ahash_set_flags(child, crypto_ahash_get_flags(tfm)
242	& CRYPTO_TFM_REQ_MASK);
243	err = crypto_ahash_setkey(child, key, keylen);
244	crypto_ahash_set_flags(tfm, crypto_ahash_get_flags(child)
245	& CRYPTO_TFM_RES_MASK);
246
247	return 0;
248	}
249
250	static int ghash_async_init_tfm(struct crypto_tfm *tfm)
251	{
252	struct cryptd_ahash *cryptd_tfm;
253	struct ghash_async_ctx *ctx = crypto_tfm_ctx(tfm);
254
255	cryptd_tfm = cryptd_alloc_ahash("__ghash-pclmulqdqni", 0, 0);
256	if (IS_ERR(cryptd_tfm))
257	return PTR_ERR(cryptd_tfm);
258	ctx->cryptd_tfm = cryptd_tfm;
259	crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
260	sizeof(struct ahash_request) +
261	crypto_ahash_reqsize(&cryptd_tfm->base));
262
263	return 0;
264	}
265
266	static void ghash_async_exit_tfm(struct crypto_tfm *tfm)
267	{
268	struct ghash_async_ctx *ctx = crypto_tfm_ctx(tfm);
269
270	cryptd_free_ahash(ctx->cryptd_tfm);
271	}
272
273	static struct ahash_alg ghash_async_alg = {
274	.init = ghash_async_init,
275	.update = ghash_async_update,
276	.final = ghash_async_final,
277	.setkey = ghash_async_setkey,
278	.digest = ghash_async_digest,
279	.halg = {
280	.digestsize = GHASH_DIGEST_SIZE,
281	.base = {
282	.cra_name = "ghash",
283	.cra_driver_name = "ghash-clmulni",
284	.cra_priority = 400,
285	.cra_flags = CRYPTO_ALG_TYPE_AHASH \| CRYPTO_ALG_ASYNC,
286	.cra_blocksize = GHASH_BLOCK_SIZE,
287	.cra_type = &crypto_ahash_type,
288	.cra_module = THIS_MODULE,
289	.cra_list = LIST_HEAD_INIT(ghash_async_alg.halg.base.cra_list),
290	.cra_init = ghash_async_init_tfm,
291	.cra_exit = ghash_async_exit_tfm,
292	},
293	},
294	};
295
296	static int __init ghash_pclmulqdqni_mod_init(void)
297	{
298	int err;
299
300	if (!cpu_has_pclmulqdq) {
301	printk(KERN_INFO "Intel PCLMULQDQ-NI instructions are not"
302	" detected.\n");
303	return -ENODEV;
304	}
305
306	err = crypto_register_shash(&ghash_alg);
307	if (err)
308	goto err_out;
309	err = crypto_register_ahash(&ghash_async_alg);
310	if (err)
311	goto err_shash;
312
313	return 0;
314
315	err_shash:
316	crypto_unregister_shash(&ghash_alg);
317	err_out:
318	return err;
319	}
320
321	static void __exit ghash_pclmulqdqni_mod_exit(void)
322	{
323	crypto_unregister_ahash(&ghash_async_alg);
324	crypto_unregister_shash(&ghash_alg);
325	}
326
327	module_init(ghash_pclmulqdqni_mod_init);
328	module_exit(ghash_pclmulqdqni_mod_exit);
329
330	MODULE_LICENSE("GPL");
331	MODULE_DESCRIPTION("GHASH Message Digest Algorithm, "
332	"acclerated by PCLMULQDQ-NI");
333	MODULE_ALIAS("ghash");