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

/*
 * Cryptographic API.
 *
 * Support for VIA PadLock hardware crypto engine.
 *
 * Copyright (c) 2006  Michal Ludvig <[email protected]>
 *
 * 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/algapi.h>
#include <crypto/sha.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/cryptohash.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/scatterlist.h>
#include <asm/i387.h>
#include "padlock.h"

#define SHA1_DEFAULT_FALLBACK	"sha1-generic"
#define SHA256_DEFAULT_FALLBACK "sha256-generic"

struct padlock_sha_ctx {
	char		*data;
	size_t		used;
	int		bypass;
	void (*f_sha_padlock)(const char *in, char *out, int count);
	struct hash_desc fallback;
};

static inline struct padlock_sha_ctx *ctx(struct crypto_tfm *tfm)
{
	return crypto_tfm_ctx(tfm);
}

/* We'll need aligned address on the stack */
#define NEAREST_ALIGNED(ptr) \
	((void *)ALIGN((size_t)(ptr), PADLOCK_ALIGNMENT))

static struct crypto_alg sha1_alg, sha256_alg;

static void padlock_sha_bypass(struct crypto_tfm *tfm)
{
	if (ctx(tfm)->bypass)
		return;

	crypto_hash_init(&ctx(tfm)->fallback);
	if (ctx(tfm)->data && ctx(tfm)->used) {
		struct scatterlist sg;

		sg_init_one(&sg, ctx(tfm)->data, ctx(tfm)->used);
		crypto_hash_update(&ctx(tfm)->fallback, &sg, sg.length);
	}

	ctx(tfm)->used = 0;
	ctx(tfm)->bypass = 1;
}

static void padlock_sha_init(struct crypto_tfm *tfm)
{
	ctx(tfm)->used = 0;
	ctx(tfm)->bypass = 0;
}

static void padlock_sha_update(struct crypto_tfm *tfm,
			const uint8_t *data, unsigned int length)
{
	/* Our buffer is always one page. */
	if (unlikely(!ctx(tfm)->bypass &&
		     (ctx(tfm)->used + length > PAGE_SIZE)))
		padlock_sha_bypass(tfm);

	if (unlikely(ctx(tfm)->bypass)) {
		struct scatterlist sg;
		sg_init_one(&sg, (uint8_t *)data, length);
		crypto_hash_update(&ctx(tfm)->fallback, &sg, length);
		return;
	}

	memcpy(ctx(tfm)->data + ctx(tfm)->used, data, length);
	ctx(tfm)->used += length;
}

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

static void padlock_do_sha1(const char *in, char *out, int count)
{
	/* 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 buf[128+16];
	char *result = NEAREST_ALIGNED(buf);
	int ts_state;

	((uint32_t *)result)[0] = SHA1_H0;
	((uint32_t *)result)[1] = SHA1_H1;
	((uint32_t *)result)[2] = SHA1_H2;
	((uint32_t *)result)[3] = SHA1_H3;
	((uint32_t *)result)[4] = SHA1_H4;
 
	/* prevent taking the spurious DNA fault with padlock. */
	ts_state = irq_ts_save();
	asm volatile (".byte 0xf3,0x0f,0xa6,0xc8" /* rep xsha1 */
		      : "+S"(in), "+D"(result)
		      : "c"(count), "a"(0));
	irq_ts_restore(ts_state);

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

static void padlock_do_sha256(const char *in, char *out, int count)
{
	/* 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 buf[128+16];
	char *result = NEAREST_ALIGNED(buf);
	int ts_state;

	((uint32_t *)result)[0] = SHA256_H0;
	((uint32_t *)result)[1] = SHA256_H1;
	((uint32_t *)result)[2] = SHA256_H2;
	((uint32_t *)result)[3] = SHA256_H3;
	((uint32_t *)result)[4] = SHA256_H4;
	((uint32_t *)result)[5] = SHA256_H5;
	((uint32_t *)result)[6] = SHA256_H6;
	((uint32_t *)result)[7] = SHA256_H7;

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

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

static void padlock_sha_final(struct crypto_tfm *tfm, uint8_t *out)
{
	if (unlikely(ctx(tfm)->bypass)) {
		crypto_hash_final(&ctx(tfm)->fallback, out);
		ctx(tfm)->bypass = 0;
		return;
	}

	/* Pass the input buffer to PadLock microcode... */
	ctx(tfm)->f_sha_padlock(ctx(tfm)->data, out, ctx(tfm)->used);

	ctx(tfm)->used = 0;
}

static int padlock_cra_init(struct crypto_tfm *tfm)
{
	const char *fallback_driver_name = tfm->__crt_alg->cra_name;
	struct crypto_hash *fallback_tfm;

	/* For now we'll allocate one page. This
	 * could eventually be configurable one day. */
	ctx(tfm)->data = (char *)__get_free_page(GFP_KERNEL);
	if (!ctx(tfm)->data)
		return -ENOMEM;

	/* Allocate a fallback and abort if it failed. */
	fallback_tfm = crypto_alloc_hash(fallback_driver_name, 0,
					 CRYPTO_ALG_ASYNC |
					 CRYPTO_ALG_NEED_FALLBACK);
	if (IS_ERR(fallback_tfm)) {
		printk(KERN_WARNING PFX "Fallback driver '%s' could not be loaded!\n",
		       fallback_driver_name);
		free_page((unsigned long)(ctx(tfm)->data));
		return PTR_ERR(fallback_tfm);
	}

	ctx(tfm)->fallback.tfm = fallback_tfm;
	return 0;
}

static int padlock_sha1_cra_init(struct crypto_tfm *tfm)
{
	ctx(tfm)->f_sha_padlock = padlock_do_sha1;

	return padlock_cra_init(tfm);
}

static int padlock_sha256_cra_init(struct crypto_tfm *tfm)
{
	ctx(tfm)->f_sha_padlock = padlock_do_sha256;

	return padlock_cra_init(tfm);
}

static void padlock_cra_exit(struct crypto_tfm *tfm)
{
	if (ctx(tfm)->data) {
		free_page((unsigned long)(ctx(tfm)->data));
		ctx(tfm)->data = NULL;
	}

	crypto_free_hash(ctx(tfm)->fallback.tfm);
	ctx(tfm)->fallback.tfm = NULL;
}

static struct crypto_alg sha1_alg = {
	.cra_name		=	"sha1",
	.cra_driver_name	=	"sha1-padlock",
	.cra_priority		=	PADLOCK_CRA_PRIORITY,
	.cra_flags		=	CRYPTO_ALG_TYPE_DIGEST |
					CRYPTO_ALG_NEED_FALLBACK,
	.cra_blocksize		=	SHA1_BLOCK_SIZE,
	.cra_ctxsize		=	sizeof(struct padlock_sha_ctx),
	.cra_module		=	THIS_MODULE,
	.cra_list		=	LIST_HEAD_INIT(sha1_alg.cra_list),
	.cra_init		=	padlock_sha1_cra_init,
	.cra_exit		=	padlock_cra_exit,
	.cra_u			=	{
		.digest = {
			.dia_digestsize	=	SHA1_DIGEST_SIZE,
			.dia_init   	= 	padlock_sha_init,
			.dia_update 	=	padlock_sha_update,
			.dia_final  	=	padlock_sha_final,
		}
	}
};

static struct crypto_alg sha256_alg = {
	.cra_name		=	"sha256",
	.cra_driver_name	=	"sha256-padlock",
	.cra_priority		=	PADLOCK_CRA_PRIORITY,
	.cra_flags		=	CRYPTO_ALG_TYPE_DIGEST |
					CRYPTO_ALG_NEED_FALLBACK,
	.cra_blocksize		=	SHA256_BLOCK_SIZE,
	.cra_ctxsize		=	sizeof(struct padlock_sha_ctx),
	.cra_module		=	THIS_MODULE,
	.cra_list		=	LIST_HEAD_INIT(sha256_alg.cra_list),
	.cra_init		=	padlock_sha256_cra_init,
	.cra_exit		=	padlock_cra_exit,
	.cra_u			=	{
		.digest = {
			.dia_digestsize	=	SHA256_DIGEST_SIZE,
			.dia_init   	= 	padlock_sha_init,
			.dia_update 	=	padlock_sha_update,
			.dia_final  	=	padlock_sha_final,
		}
	}
};

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_alg(&sha1_alg);
	if (rc)
		goto out;

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

static void __exit padlock_fini(void)
{
	crypto_unregister_alg(&sha1_alg);
	crypto_unregister_alg(&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");
MODULE_ALIAS("sha256");
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 <[email protected]>
	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
6010439f	15	#include <crypto/algapi.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/cryptohash.h>
	22	#include <linux/interrupt.h>
	23	#include <linux/kernel.h>
	24	#include <linux/scatterlist.h>
e4914012	25	#include <asm/i387.h>
6c833275 ML	26	#include "padlock.h"
	27
	28	#define SHA1_DEFAULT_FALLBACK "sha1-generic"
6c833275	29	#define SHA256_DEFAULT_FALLBACK "sha256-generic"
6c833275	30
6c833275 ML	31	struct padlock_sha_ctx {
	32	char *data;
	33	size_t used;
	34	int bypass;
	35	void (f_sha_padlock)(const char in, char *out, int count);
6010439f	36	struct hash_desc fallback;
6c833275 ML	37	};
	38
	39	static inline struct padlock_sha_ctx ctx(struct crypto_tfm tfm)
	40	{
6010439f	41	return crypto_tfm_ctx(tfm);
6c833275 ML	42	}
	43
	44	/* We'll need aligned address on the stack */
	45	#define NEAREST_ALIGNED(ptr) \
	46	((void *)ALIGN((size_t)(ptr), PADLOCK_ALIGNMENT))
	47
	48	static struct crypto_alg sha1_alg, sha256_alg;
	49
	50	static void padlock_sha_bypass(struct crypto_tfm *tfm)
	51	{
	52	if (ctx(tfm)->bypass)
	53	return;
	54
6010439f	55	crypto_hash_init(&ctx(tfm)->fallback);
6c833275 ML	56	if (ctx(tfm)->data && ctx(tfm)->used) {
	57	struct scatterlist sg;
	58
68e3f5dd	59	sg_init_one(&sg, ctx(tfm)->data, ctx(tfm)->used);
6010439f	60	crypto_hash_update(&ctx(tfm)->fallback, &sg, sg.length);
6c833275 ML	61	}
	62
	63	ctx(tfm)->used = 0;
	64	ctx(tfm)->bypass = 1;
	65	}
	66
	67	static void padlock_sha_init(struct crypto_tfm *tfm)
	68	{
	69	ctx(tfm)->used = 0;
	70	ctx(tfm)->bypass = 0;
	71	}
	72
	73	static void padlock_sha_update(struct crypto_tfm *tfm,
	74	const uint8_t *data, unsigned int length)
	75	{
	76	/* Our buffer is always one page. */
	77	if (unlikely(!ctx(tfm)->bypass &&
	78	(ctx(tfm)->used + length > PAGE_SIZE)))
	79	padlock_sha_bypass(tfm);
	80
	81	if (unlikely(ctx(tfm)->bypass)) {
	82	struct scatterlist sg;
68e3f5dd	83	sg_init_one(&sg, (uint8_t *)data, length);
6010439f	84	crypto_hash_update(&ctx(tfm)->fallback, &sg, length);
6c833275 ML	85	return;
	86	}
	87
	88	memcpy(ctx(tfm)->data + ctx(tfm)->used, data, length);
	89	ctx(tfm)->used += length;
	90	}
	91
	92	static inline void padlock_output_block(uint32_t *src,
	93	uint32_t *dst, size_t count)
	94	{
	95	while (count--)
	96	dst++ = swab32(src++);
	97	}
	98
cb17530b	99	static void padlock_do_sha1(const char in, char out, int count)
6c833275 ML	100	{
	101	/* We can't store directly to out as it may be unaligned. /
	102	/* BTW Don't reduce the buffer size below 128 Bytes!
	103	* PadLock microcode needs it that big. */
	104	char buf[128+16];
	105	char *result = NEAREST_ALIGNED(buf);
e4914012	106	int ts_state;
6c833275	107
5265eeb2 JG	108	((uint32_t *)result)[0] = SHA1_H0;
	109	((uint32_t *)result)[1] = SHA1_H1;
	110	((uint32_t *)result)[2] = SHA1_H2;
	111	((uint32_t *)result)[3] = SHA1_H3;
	112	((uint32_t *)result)[4] = SHA1_H4;
6c833275	113
e4914012 SS	114	/* prevent taking the spurious DNA fault with padlock. */
e4914012 SS	115	ts_state = irq_ts_save();
6c833275 ML	116	asm volatile (".byte 0xf3,0x0f,0xa6,0xc8" /* rep xsha1 */
	117	: "+S"(in), "+D"(result)
	118	: "c"(count), "a"(0));
e4914012	119	irq_ts_restore(ts_state);
6c833275 ML	120
	121	padlock_output_block((uint32_t )result, (uint32_t )out, 5);
	122	}
	123
cb17530b	124	static void padlock_do_sha256(const char in, char out, int count)
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. */
	129	char buf[128+16];
	130	char *result = NEAREST_ALIGNED(buf);
e4914012	131	int ts_state;
6c833275	132
5265eeb2 JG	133	((uint32_t *)result)[0] = SHA256_H0;
	134	((uint32_t *)result)[1] = SHA256_H1;
	135	((uint32_t *)result)[2] = SHA256_H2;
	136	((uint32_t *)result)[3] = SHA256_H3;
	137	((uint32_t *)result)[4] = SHA256_H4;
	138	((uint32_t *)result)[5] = SHA256_H5;
	139	((uint32_t *)result)[6] = SHA256_H6;
	140	((uint32_t *)result)[7] = SHA256_H7;
6c833275	141
e4914012 SS	142	/* prevent taking the spurious DNA fault with padlock. */
e4914012 SS	143	ts_state = irq_ts_save();
6c833275 ML	144	asm volatile (".byte 0xf3,0x0f,0xa6,0xd0" /* rep xsha256 */
	145	: "+S"(in), "+D"(result)
	146	: "c"(count), "a"(0));
e4914012	147	irq_ts_restore(ts_state);
6c833275 ML	148
	149	padlock_output_block((uint32_t )result, (uint32_t )out, 8);
	150	}
	151
	152	static void padlock_sha_final(struct crypto_tfm tfm, uint8_t out)
	153	{
	154	if (unlikely(ctx(tfm)->bypass)) {
6010439f	155	crypto_hash_final(&ctx(tfm)->fallback, out);
6c833275 ML	156	ctx(tfm)->bypass = 0;
	157	return;
	158	}
	159
	160	/* Pass the input buffer to PadLock microcode... */
	161	ctx(tfm)->f_sha_padlock(ctx(tfm)->data, out, ctx(tfm)->used);
	162
	163	ctx(tfm)->used = 0;
	164	}
	165
6010439f	166	static int padlock_cra_init(struct crypto_tfm *tfm)
6c833275	167	{
6010439f HX	168	const char *fallback_driver_name = tfm->__crt_alg->cra_name;
	169	struct crypto_hash *fallback_tfm;
	170
6c833275 ML	171	/* For now we'll allocate one page. This
	172	* could eventually be configurable one day. */
	173	ctx(tfm)->data = (char *)__get_free_page(GFP_KERNEL);
	174	if (!ctx(tfm)->data)
	175	return -ENOMEM;
	176
	177	/* Allocate a fallback and abort if it failed. */
6010439f HX	178	fallback_tfm = crypto_alloc_hash(fallback_driver_name, 0,
	179	CRYPTO_ALG_ASYNC \|
	180	CRYPTO_ALG_NEED_FALLBACK);
	181	if (IS_ERR(fallback_tfm)) {
6c833275 ML	182	printk(KERN_WARNING PFX "Fallback driver '%s' could not be loaded!\n",
	183	fallback_driver_name);
	184	free_page((unsigned long)(ctx(tfm)->data));
6010439f	185	return PTR_ERR(fallback_tfm);
6c833275 ML	186	}
6c833275 ML	187
6010439f	188	ctx(tfm)->fallback.tfm = fallback_tfm;
6c833275 ML	189	return 0;
	190	}
	191
	192	static int padlock_sha1_cra_init(struct crypto_tfm *tfm)
	193	{
	194	ctx(tfm)->f_sha_padlock = padlock_do_sha1;
	195
6010439f	196	return padlock_cra_init(tfm);
6c833275 ML	197	}
	198
	199	static int padlock_sha256_cra_init(struct crypto_tfm *tfm)
	200	{
	201	ctx(tfm)->f_sha_padlock = padlock_do_sha256;
	202
6010439f	203	return padlock_cra_init(tfm);
6c833275 ML	204	}
	205
	206	static void padlock_cra_exit(struct crypto_tfm *tfm)
	207	{
	208	if (ctx(tfm)->data) {
	209	free_page((unsigned long)(ctx(tfm)->data));
	210	ctx(tfm)->data = NULL;
	211	}
	212
6010439f HX	213	crypto_free_hash(ctx(tfm)->fallback.tfm);
6010439f HX	214	ctx(tfm)->fallback.tfm = NULL;
6c833275 ML	215	}
	216
	217	static struct crypto_alg sha1_alg = {
	218	.cra_name = "sha1",
	219	.cra_driver_name = "sha1-padlock",
	220	.cra_priority = PADLOCK_CRA_PRIORITY,
6010439f HX	221	.cra_flags = CRYPTO_ALG_TYPE_DIGEST \|
6010439f HX	222	CRYPTO_ALG_NEED_FALLBACK,
5265eeb2	223	.cra_blocksize = SHA1_BLOCK_SIZE,
6c833275 ML	224	.cra_ctxsize = sizeof(struct padlock_sha_ctx),
	225	.cra_module = THIS_MODULE,
	226	.cra_list = LIST_HEAD_INIT(sha1_alg.cra_list),
	227	.cra_init = padlock_sha1_cra_init,
	228	.cra_exit = padlock_cra_exit,
	229	.cra_u = {
	230	.digest = {
	231	.dia_digestsize = SHA1_DIGEST_SIZE,
	232	.dia_init = padlock_sha_init,
	233	.dia_update = padlock_sha_update,
	234	.dia_final = padlock_sha_final,
	235	}
	236	}
	237	};
	238
	239	static struct crypto_alg sha256_alg = {
	240	.cra_name = "sha256",
	241	.cra_driver_name = "sha256-padlock",
	242	.cra_priority = PADLOCK_CRA_PRIORITY,
6010439f HX	243	.cra_flags = CRYPTO_ALG_TYPE_DIGEST \|
6010439f HX	244	CRYPTO_ALG_NEED_FALLBACK,
5265eeb2	245	.cra_blocksize = SHA256_BLOCK_SIZE,
6c833275 ML	246	.cra_ctxsize = sizeof(struct padlock_sha_ctx),
	247	.cra_module = THIS_MODULE,
	248	.cra_list = LIST_HEAD_INIT(sha256_alg.cra_list),
	249	.cra_init = padlock_sha256_cra_init,
	250	.cra_exit = padlock_cra_exit,
	251	.cra_u = {
	252	.digest = {
	253	.dia_digestsize = SHA256_DIGEST_SIZE,
	254	.dia_init = padlock_sha_init,
	255	.dia_update = padlock_sha_update,
	256	.dia_final = padlock_sha_final,
	257	}
	258	}
	259	};
	260
6c833275 ML	261	static int __init padlock_init(void)
	262	{
	263	int rc = -ENODEV;
	264
	265	if (!cpu_has_phe) {
b43e726b	266	printk(KERN_NOTICE PFX "VIA PadLock Hash Engine not detected.\n");
6c833275 ML	267	return -ENODEV;
	268	}
	269
	270	if (!cpu_has_phe_enabled) {
b43e726b	271	printk(KERN_NOTICE PFX "VIA PadLock detected, but not enabled. Hmm, strange...\n");
6c833275 ML	272	return -ENODEV;
	273	}
	274
6c833275 ML	275	rc = crypto_register_alg(&sha1_alg);
	276	if (rc)
	277	goto out;
	278
	279	rc = crypto_register_alg(&sha256_alg);
	280	if (rc)
	281	goto out_unreg1;
	282
	283	printk(KERN_NOTICE PFX "Using VIA PadLock ACE for SHA1/SHA256 algorithms.\n");
	284
	285	return 0;
	286
	287	out_unreg1:
	288	crypto_unregister_alg(&sha1_alg);
	289	out:
	290	printk(KERN_ERR PFX "VIA PadLock SHA1/SHA256 initialization failed.\n");
	291	return rc;
	292	}
	293
	294	static void __exit padlock_fini(void)
	295	{
	296	crypto_unregister_alg(&sha1_alg);
	297	crypto_unregister_alg(&sha256_alg);
	298	}
	299
	300	module_init(padlock_init);
	301	module_exit(padlock_fini);
	302
	303	MODULE_DESCRIPTION("VIA PadLock SHA1/SHA256 algorithms support.");
	304	MODULE_LICENSE("GPL");
	305	MODULE_AUTHOR("Michal Ludvig");
	306
ad5d2789 SS	307	MODULE_ALIAS("sha1");
ad5d2789 SS	308	MODULE_ALIAS("sha256");
6c833275 ML	309	MODULE_ALIAS("sha1-padlock");
6c833275 ML	310	MODULE_ALIAS("sha256-padlock");