[deliverable/linux.git] / drivers / crypto / padlock-sha.c

/*
 * Cryptographic API.
 *
 * Support for VIA PadLock hardware crypto engine.
 *
 * Copyright (c) 2006  Michal Ludvig <michal@logix.cz>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 */

#include <crypto/internal/hash.h>
#include <crypto/sha.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/scatterlist.h>
#include <asm/i387.h>
#include "padlock.h"

struct padlock_sha_desc {
	struct shash_desc fallback;
};

struct padlock_sha_ctx {
	struct crypto_shash *fallback;
};

static int padlock_sha_init(struct shash_desc *desc)
{
	struct padlock_sha_desc *dctx = shash_desc_ctx(desc);
	struct padlock_sha_ctx *ctx = crypto_shash_ctx(desc->tfm);

	dctx->fallback.tfm = ctx->fallback;
	dctx->fallback.flags = desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
	return crypto_shash_init(&dctx->fallback);
}

static int padlock_sha_update(struct shash_desc *desc,
			      const u8 *data, unsigned int length)
{
	struct padlock_sha_desc *dctx = shash_desc_ctx(desc);

	dctx->fallback.flags = desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
	return crypto_shash_update(&dctx->fallback, data, length);
}

static inline void padlock_output_block(uint32_t *src,
		 	uint32_t *dst, size_t count)
{
	while (count--)
		*dst++ = swab32(*src++);
}

static int padlock_sha1_finup(struct shash_desc *desc, const u8 *in,
			      unsigned int count, u8 *out)
{
	/* We can't store directly to *out as it may be unaligned. */
	/* BTW Don't reduce the buffer size below 128 Bytes!
	 *     PadLock microcode needs it that big. */
	char result[128] __attribute__ ((aligned(PADLOCK_ALIGNMENT)));
	struct padlock_sha_desc *dctx = shash_desc_ctx(desc);
	struct sha1_state state;
	unsigned int space;
	unsigned int leftover;
	int ts_state;
	int err;

	dctx->fallback.flags = desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
	err = crypto_shash_export(&dctx->fallback, &state);
	if (err)
		goto out;

	if (state.count + count > ULONG_MAX)
		return crypto_shash_finup(&dctx->fallback, in, count, out);

	leftover = ((state.count - 1) & (SHA1_BLOCK_SIZE - 1)) + 1;
	space =  SHA1_BLOCK_SIZE - leftover;
	if (space) {
		if (count > space) {
			err = crypto_shash_update(&dctx->fallback, in, space) ?:
			      crypto_shash_export(&dctx->fallback, &state);
			if (err)
				goto out;
			count -= space;
			in += space;
		} else {
			memcpy(state.buffer + leftover, in, count);
			in = state.buffer;
			count += leftover;
		}
	}

	memcpy(result, &state.state, SHA1_DIGEST_SIZE);

	/* prevent taking the spurious DNA fault with padlock. */
	ts_state = irq_ts_save();
	asm volatile (".byte 0xf3,0x0f,0xa6,0xc8" /* rep xsha1 */
		      : \
		      : "c"(state.count + count), "a"(state.count), \
			"S"(in), "D"(result));
	irq_ts_restore(ts_state);

	padlock_output_block((uint32_t *)result, (uint32_t *)out, 5);

out:
	return err;
}

static int padlock_sha1_final(struct shash_desc *desc, u8 *out)
{
	u8 buf[4];

	return padlock_sha1_finup(desc, buf, 0, out);
}

static int padlock_sha256_finup(struct shash_desc *desc, const u8 *in,
				unsigned int count, u8 *out)
{
	/* We can't store directly to *out as it may be unaligned. */
	/* BTW Don't reduce the buffer size below 128 Bytes!
	 *     PadLock microcode needs it that big. */
	char result[128] __attribute__ ((aligned(PADLOCK_ALIGNMENT)));
	struct padlock_sha_desc *dctx = shash_desc_ctx(desc);
	struct sha256_state state;
	unsigned int space;
	unsigned int leftover;
	int ts_state;
	int err;

	dctx->fallback.flags = desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
	err = crypto_shash_export(&dctx->fallback, &state);
	if (err)
		goto out;

	if (state.count + count > ULONG_MAX)
		return crypto_shash_finup(&dctx->fallback, in, count, out);

	leftover = ((state.count - 1) & (SHA256_BLOCK_SIZE - 1)) + 1;
	space =  SHA256_BLOCK_SIZE - leftover;
	if (space) {
		if (count > space) {
			err = crypto_shash_update(&dctx->fallback, in, space) ?:
			      crypto_shash_export(&dctx->fallback, &state);
			if (err)
				goto out;
			count -= space;
			in += space;
		} else {
			memcpy(state.buf + leftover, in, count);
			in = state.buf;
			count += leftover;
		}
	}

	memcpy(result, &state.state, SHA256_DIGEST_SIZE);

	/* prevent taking the spurious DNA fault with padlock. */
	ts_state = irq_ts_save();
	asm volatile (".byte 0xf3,0x0f,0xa6,0xd0" /* rep xsha256 */
		      : \
		      : "c"(state.count + count), "a"(state.count), \
			"S"(in), "D"(result));
	irq_ts_restore(ts_state);

	padlock_output_block((uint32_t *)result, (uint32_t *)out, 8);

out:
	return err;
}

static int padlock_sha256_final(struct shash_desc *desc, u8 *out)
{
	u8 buf[4];

	return padlock_sha256_finup(desc, buf, 0, out);
}

static int padlock_cra_init(struct crypto_tfm *tfm)
{
	struct crypto_shash *hash = __crypto_shash_cast(tfm);
	const char *fallback_driver_name = tfm->__crt_alg->cra_name;
	struct padlock_sha_ctx *ctx = crypto_tfm_ctx(tfm);
	struct crypto_shash *fallback_tfm;
	int err = -ENOMEM;

	/* Allocate a fallback and abort if it failed. */
	fallback_tfm = crypto_alloc_shash(fallback_driver_name, 0,
					  CRYPTO_ALG_NEED_FALLBACK);
	if (IS_ERR(fallback_tfm)) {
		printk(KERN_WARNING PFX "Fallback driver '%s' could not be loaded!\n",
		       fallback_driver_name);
		err = PTR_ERR(fallback_tfm);
		goto out;
	}

	ctx->fallback = fallback_tfm;
	hash->descsize += crypto_shash_descsize(fallback_tfm);
	return 0;

out:
	return err;
}

static void padlock_cra_exit(struct crypto_tfm *tfm)
{
	struct padlock_sha_ctx *ctx = crypto_tfm_ctx(tfm);

	crypto_free_shash(ctx->fallback);
}

static struct shash_alg sha1_alg = {
	.digestsize	=	SHA1_DIGEST_SIZE,
	.init   	= 	padlock_sha_init,
	.update 	=	padlock_sha_update,
	.finup  	=	padlock_sha1_finup,
	.final  	=	padlock_sha1_final,
	.descsize	=	sizeof(struct padlock_sha_desc),
	.base		=	{
		.cra_name		=	"sha1",
		.cra_driver_name	=	"sha1-padlock",
		.cra_priority		=	PADLOCK_CRA_PRIORITY,
		.cra_flags		=	CRYPTO_ALG_TYPE_SHASH |
						CRYPTO_ALG_NEED_FALLBACK,
		.cra_blocksize		=	SHA1_BLOCK_SIZE,
		.cra_ctxsize		=	sizeof(struct padlock_sha_ctx),
		.cra_module		=	THIS_MODULE,
		.cra_init		=	padlock_cra_init,
		.cra_exit		=	padlock_cra_exit,
	}
};

static struct shash_alg sha256_alg = {
	.digestsize	=	SHA256_DIGEST_SIZE,
	.init   	= 	padlock_sha_init,
	.update 	=	padlock_sha_update,
	.finup  	=	padlock_sha256_finup,
	.final  	=	padlock_sha256_final,
	.descsize	=	sizeof(struct padlock_sha_desc),
	.base		=	{
		.cra_name		=	"sha256",
		.cra_driver_name	=	"sha256-padlock",
		.cra_priority		=	PADLOCK_CRA_PRIORITY,
		.cra_flags		=	CRYPTO_ALG_TYPE_SHASH |
						CRYPTO_ALG_NEED_FALLBACK,
		.cra_blocksize		=	SHA256_BLOCK_SIZE,
		.cra_ctxsize		=	sizeof(struct padlock_sha_ctx),
		.cra_module		=	THIS_MODULE,
		.cra_init		=	padlock_cra_init,
		.cra_exit		=	padlock_cra_exit,
	}
};

static int __init padlock_init(void)
{
	int rc = -ENODEV;

	if (!cpu_has_phe) {
		printk(KERN_NOTICE PFX "VIA PadLock Hash Engine not detected.\n");
		return -ENODEV;
	}

	if (!cpu_has_phe_enabled) {
		printk(KERN_NOTICE PFX "VIA PadLock detected, but not enabled. Hmm, strange...\n");
		return -ENODEV;
	}

	rc = crypto_register_shash(&sha1_alg);
	if (rc)
		goto out;

	rc = crypto_register_shash(&sha256_alg);
	if (rc)
		goto out_unreg1;

	printk(KERN_NOTICE PFX "Using VIA PadLock ACE for SHA1/SHA256 algorithms.\n");

	return 0;

out_unreg1:
	crypto_unregister_shash(&sha1_alg);
out:
	printk(KERN_ERR PFX "VIA PadLock SHA1/SHA256 initialization failed.\n");
	return rc;
}

static void __exit padlock_fini(void)
{
	crypto_unregister_shash(&sha1_alg);
	crypto_unregister_shash(&sha256_alg);
}

module_init(padlock_init);
module_exit(padlock_fini);

MODULE_DESCRIPTION("VIA PadLock SHA1/SHA256 algorithms support.");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Michal Ludvig");

MODULE_ALIAS("sha1-all");
MODULE_ALIAS("sha256-all");
MODULE_ALIAS("sha1-padlock");
MODULE_ALIAS("sha256-padlock");
Commit	Line	Data
6c833275 ML	1	/*
	2	* Cryptographic API.
	3	*
	4	* Support for VIA PadLock hardware crypto engine.
	5	*
	6	* Copyright (c) 2006 Michal Ludvig <michal@logix.cz>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	*/
	14
7d024608	15	#include <crypto/internal/hash.h>
5265eeb2	16	#include <crypto/sha.h>
6010439f	17	#include <linux/err.h>
6c833275 ML	18	#include <linux/module.h>
	19	#include <linux/init.h>
	20	#include <linux/errno.h>
6c833275 ML	21	#include <linux/interrupt.h>
	22	#include <linux/kernel.h>
	23	#include <linux/scatterlist.h>
e4914012	24	#include <asm/i387.h>
6c833275 ML	25	#include "padlock.h"
6c833275 ML	26
bbbee467 HX	27	struct padlock_sha_desc {
bbbee467 HX	28	struct shash_desc fallback;
6c833275 ML	29	};
6c833275 ML	30
bbbee467 HX	31	struct padlock_sha_ctx {
	32	struct crypto_shash *fallback;
	33	};
6c833275	34
bbbee467	35	static int padlock_sha_init(struct shash_desc *desc)
6c833275	36	{
bbbee467 HX	37	struct padlock_sha_desc *dctx = shash_desc_ctx(desc);
bbbee467 HX	38	struct padlock_sha_ctx *ctx = crypto_shash_ctx(desc->tfm);
6c833275	39
bbbee467 HX	40	dctx->fallback.tfm = ctx->fallback;
	41	dctx->fallback.flags = desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
	42	return crypto_shash_init(&dctx->fallback);
6c833275 ML	43	}
6c833275 ML	44
bbbee467 HX	45	static int padlock_sha_update(struct shash_desc *desc,
bbbee467 HX	46	const u8 *data, unsigned int length)
6c833275	47	{
bbbee467	48	struct padlock_sha_desc *dctx = shash_desc_ctx(desc);
6c833275	49
bbbee467 HX	50	dctx->fallback.flags = desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
bbbee467 HX	51	return crypto_shash_update(&dctx->fallback, data, length);
6c833275 ML	52	}
	53
	54	static inline void padlock_output_block(uint32_t *src,
	55	uint32_t *dst, size_t count)
	56	{
	57	while (count--)
	58	dst++ = swab32(src++);
	59	}
	60
bbbee467 HX	61	static int padlock_sha1_finup(struct shash_desc desc, const u8 in,
bbbee467 HX	62	unsigned int count, u8 *out)
6c833275 ML	63	{
	64	/* We can't store directly to out as it may be unaligned. /
	65	/* BTW Don't reduce the buffer size below 128 Bytes!
	66	* PadLock microcode needs it that big. */
bbbee467 HX	67	char result[128] __attribute__ ((aligned(PADLOCK_ALIGNMENT)));
	68	struct padlock_sha_desc *dctx = shash_desc_ctx(desc);
	69	struct sha1_state state;
	70	unsigned int space;
	71	unsigned int leftover;
e4914012	72	int ts_state;
bbbee467 HX	73	int err;
	74
	75	dctx->fallback.flags = desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
	76	err = crypto_shash_export(&dctx->fallback, &state);
	77	if (err)
	78	goto out;
	79
	80	if (state.count + count > ULONG_MAX)
	81	return crypto_shash_finup(&dctx->fallback, in, count, out);
	82
	83	leftover = ((state.count - 1) & (SHA1_BLOCK_SIZE - 1)) + 1;
	84	space = SHA1_BLOCK_SIZE - leftover;
	85	if (space) {
	86	if (count > space) {
	87	err = crypto_shash_update(&dctx->fallback, in, space) ?:
	88	crypto_shash_export(&dctx->fallback, &state);
	89	if (err)
	90	goto out;
	91	count -= space;
	92	in += space;
	93	} else {
	94	memcpy(state.buffer + leftover, in, count);
	95	in = state.buffer;
	96	count += leftover;
	97	}
	98	}
	99
	100	memcpy(result, &state.state, SHA1_DIGEST_SIZE);
6c833275	101
e4914012 SS	102	/* prevent taking the spurious DNA fault with padlock. */
e4914012 SS	103	ts_state = irq_ts_save();
6c833275	104	asm volatile (".byte 0xf3,0x0f,0xa6,0xc8" /* rep xsha1 */
bbbee467 HX	105	: \
	106	: "c"(state.count + count), "a"(state.count), \
	107	"S"(in), "D"(result));
e4914012	108	irq_ts_restore(ts_state);
6c833275 ML	109
6c833275 ML	110	padlock_output_block((uint32_t )result, (uint32_t )out, 5);
bbbee467 HX	111
	112	out:
	113	return err;
6c833275 ML	114	}
6c833275 ML	115
bbbee467 HX	116	static int padlock_sha1_final(struct shash_desc desc, u8 out)
	117	{
	118	u8 buf[4];
	119
	120	return padlock_sha1_finup(desc, buf, 0, out);
	121	}
	122
	123	static int padlock_sha256_finup(struct shash_desc desc, const u8 in,
	124	unsigned int count, u8 *out)
6c833275 ML	125	{
	126	/* We can't store directly to out as it may be unaligned. /
	127	/* BTW Don't reduce the buffer size below 128 Bytes!
	128	* PadLock microcode needs it that big. */
bbbee467 HX	129	char result[128] __attribute__ ((aligned(PADLOCK_ALIGNMENT)));
	130	struct padlock_sha_desc *dctx = shash_desc_ctx(desc);
	131	struct sha256_state state;
	132	unsigned int space;
	133	unsigned int leftover;
e4914012	134	int ts_state;
bbbee467	135	int err;
6c833275	136
bbbee467 HX	137	dctx->fallback.flags = desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
	138	err = crypto_shash_export(&dctx->fallback, &state);
	139	if (err)
	140	goto out;
	141
	142	if (state.count + count > ULONG_MAX)
	143	return crypto_shash_finup(&dctx->fallback, in, count, out);
	144
	145	leftover = ((state.count - 1) & (SHA256_BLOCK_SIZE - 1)) + 1;
	146	space = SHA256_BLOCK_SIZE - leftover;
	147	if (space) {
	148	if (count > space) {
	149	err = crypto_shash_update(&dctx->fallback, in, space) ?:
	150	crypto_shash_export(&dctx->fallback, &state);
	151	if (err)
	152	goto out;
	153	count -= space;
	154	in += space;
	155	} else {
	156	memcpy(state.buf + leftover, in, count);
	157	in = state.buf;
	158	count += leftover;
	159	}
	160	}
	161
	162	memcpy(result, &state.state, SHA256_DIGEST_SIZE);
6c833275	163
e4914012 SS	164	/* prevent taking the spurious DNA fault with padlock. */
e4914012 SS	165	ts_state = irq_ts_save();
6c833275	166	asm volatile (".byte 0xf3,0x0f,0xa6,0xd0" /* rep xsha256 */
bbbee467 HX	167	: \
	168	: "c"(state.count + count), "a"(state.count), \
	169	"S"(in), "D"(result));
e4914012	170	irq_ts_restore(ts_state);
6c833275 ML	171
6c833275 ML	172	padlock_output_block((uint32_t )result, (uint32_t )out, 8);
bbbee467 HX	173
	174	out:
	175	return err;
6c833275 ML	176	}
6c833275 ML	177
bbbee467	178	static int padlock_sha256_final(struct shash_desc desc, u8 out)
6c833275	179	{
bbbee467	180	u8 buf[4];
6c833275	181
bbbee467	182	return padlock_sha256_finup(desc, buf, 0, out);
6c833275 ML	183	}
6c833275 ML	184
6010439f	185	static int padlock_cra_init(struct crypto_tfm *tfm)
6c833275	186	{
bbbee467	187	struct crypto_shash *hash = __crypto_shash_cast(tfm);
6010439f	188	const char *fallback_driver_name = tfm->__crt_alg->cra_name;
bbbee467	189	struct padlock_sha_ctx *ctx = crypto_tfm_ctx(tfm);
7d024608 HX	190	struct crypto_shash *fallback_tfm;
7d024608 HX	191	int err = -ENOMEM;
6010439f	192
6c833275	193	/* Allocate a fallback and abort if it failed. */
7d024608 HX	194	fallback_tfm = crypto_alloc_shash(fallback_driver_name, 0,
7d024608 HX	195	CRYPTO_ALG_NEED_FALLBACK);
6010439f	196	if (IS_ERR(fallback_tfm)) {
6c833275 ML	197	printk(KERN_WARNING PFX "Fallback driver '%s' could not be loaded!\n",
6c833275 ML	198	fallback_driver_name);
7d024608	199	err = PTR_ERR(fallback_tfm);
bbbee467	200	goto out;
6c833275 ML	201	}
6c833275 ML	202
bbbee467 HX	203	ctx->fallback = fallback_tfm;
bbbee467 HX	204	hash->descsize += crypto_shash_descsize(fallback_tfm);
6c833275	205	return 0;
7d024608	206
7d024608 HX	207	out:
7d024608 HX	208	return err;
6c833275 ML	209	}
6c833275 ML	210
6c833275 ML	211	static void padlock_cra_exit(struct crypto_tfm *tfm)
6c833275 ML	212	{
bbbee467	213	struct padlock_sha_ctx *ctx = crypto_tfm_ctx(tfm);
7d024608	214
bbbee467	215	crypto_free_shash(ctx->fallback);
6c833275 ML	216	}
6c833275 ML	217
bbbee467 HX	218	static struct shash_alg sha1_alg = {
	219	.digestsize = SHA1_DIGEST_SIZE,
	220	.init = padlock_sha_init,
	221	.update = padlock_sha_update,
	222	.finup = padlock_sha1_finup,
	223	.final = padlock_sha1_final,
	224	.descsize = sizeof(struct padlock_sha_desc),
	225	.base = {
	226	.cra_name = "sha1",
	227	.cra_driver_name = "sha1-padlock",
	228	.cra_priority = PADLOCK_CRA_PRIORITY,
	229	.cra_flags = CRYPTO_ALG_TYPE_SHASH \|
	230	CRYPTO_ALG_NEED_FALLBACK,
	231	.cra_blocksize = SHA1_BLOCK_SIZE,
	232	.cra_ctxsize = sizeof(struct padlock_sha_ctx),
	233	.cra_module = THIS_MODULE,
	234	.cra_init = padlock_cra_init,
	235	.cra_exit = padlock_cra_exit,
6c833275 ML	236	}
	237	};
	238
bbbee467 HX	239	static struct shash_alg sha256_alg = {
	240	.digestsize = SHA256_DIGEST_SIZE,
	241	.init = padlock_sha_init,
	242	.update = padlock_sha_update,
	243	.finup = padlock_sha256_finup,
	244	.final = padlock_sha256_final,
	245	.descsize = sizeof(struct padlock_sha_desc),
	246	.base = {
	247	.cra_name = "sha256",
	248	.cra_driver_name = "sha256-padlock",
	249	.cra_priority = PADLOCK_CRA_PRIORITY,
	250	.cra_flags = CRYPTO_ALG_TYPE_SHASH \|
	251	CRYPTO_ALG_NEED_FALLBACK,
	252	.cra_blocksize = SHA256_BLOCK_SIZE,
	253	.cra_ctxsize = sizeof(struct padlock_sha_ctx),
	254	.cra_module = THIS_MODULE,
	255	.cra_init = padlock_cra_init,
	256	.cra_exit = padlock_cra_exit,
6c833275 ML	257	}
	258	};
	259
6c833275 ML	260	static int __init padlock_init(void)
	261	{
	262	int rc = -ENODEV;
	263
	264	if (!cpu_has_phe) {
b43e726b	265	printk(KERN_NOTICE PFX "VIA PadLock Hash Engine not detected.\n");
6c833275 ML	266	return -ENODEV;
	267	}
	268
	269	if (!cpu_has_phe_enabled) {
b43e726b	270	printk(KERN_NOTICE PFX "VIA PadLock detected, but not enabled. Hmm, strange...\n");
6c833275 ML	271	return -ENODEV;
	272	}
	273
bbbee467	274	rc = crypto_register_shash(&sha1_alg);
6c833275 ML	275	if (rc)
	276	goto out;
	277
bbbee467	278	rc = crypto_register_shash(&sha256_alg);
6c833275 ML	279	if (rc)
	280	goto out_unreg1;
	281
	282	printk(KERN_NOTICE PFX "Using VIA PadLock ACE for SHA1/SHA256 algorithms.\n");
	283
	284	return 0;
	285
	286	out_unreg1:
bbbee467	287	crypto_unregister_shash(&sha1_alg);
6c833275 ML	288	out:
	289	printk(KERN_ERR PFX "VIA PadLock SHA1/SHA256 initialization failed.\n");
	290	return rc;
	291	}
	292
	293	static void __exit padlock_fini(void)
	294	{
bbbee467 HX	295	crypto_unregister_shash(&sha1_alg);
bbbee467 HX	296	crypto_unregister_shash(&sha256_alg);
6c833275 ML	297	}
	298
	299	module_init(padlock_init);
	300	module_exit(padlock_fini);
	301
	302	MODULE_DESCRIPTION("VIA PadLock SHA1/SHA256 algorithms support.");
	303	MODULE_LICENSE("GPL");
	304	MODULE_AUTHOR("Michal Ludvig");
	305
a760a665 HX	306	MODULE_ALIAS("sha1-all");
a760a665 HX	307	MODULE_ALIAS("sha256-all");
6c833275 ML	308	MODULE_ALIAS("sha1-padlock");
6c833275 ML	309	MODULE_ALIAS("sha256-padlock");