drivers/crypto/padlock-sha.c - linux - Git at Google

 /*
  * 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 <linux/module.h>
 #include <linux/init.h>
 #include <linux/errno.h>
 #include <linux/crypto.h>
 #include <linux/cryptohash.h>
 #include <linux/interrupt.h>
 #include <linux/kernel.h>
 #include <linux/scatterlist.h>
 #include "padlock.h"

 #define SHA1_DEFAULT_FALLBACK	"sha1-generic"
 #define SHA1_DIGEST_SIZE        20
 #define SHA1_HMAC_BLOCK_SIZE    64

 #define SHA256_DEFAULT_FALLBACK "sha256-generic"
 #define SHA256_DIGEST_SIZE      32
 #define SHA256_HMAC_BLOCK_SIZE  64

 static char *sha1_fallback = SHA1_DEFAULT_FALLBACK;
 static char *sha256_fallback = SHA256_DEFAULT_FALLBACK;

 module_param(sha1_fallback, charp, 0644);
 module_param(sha256_fallback, charp, 0644);

 MODULE_PARM_DESC(sha1_fallback, "Fallback driver for SHA1. Default is "
 		 SHA1_DEFAULT_FALLBACK);
 MODULE_PARM_DESC(sha256_fallback, "Fallback driver for SHA256. Default is "
 		 SHA256_DEFAULT_FALLBACK);

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

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

 	BUG_ON(!ctx(tfm)->fallback_tfm);

 	crypto_digest_init(ctx(tfm)->fallback_tfm);
 	if (ctx(tfm)->data && ctx(tfm)->used) {
 		struct scatterlist sg;

 		sg_set_buf(&sg, ctx(tfm)->data, ctx(tfm)->used);
 		crypto_digest_update(ctx(tfm)->fallback_tfm, &sg, 1);
 	}

 	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;
 		BUG_ON(!ctx(tfm)->fallback_tfm);
 		sg_set_buf(&sg, (uint8_t *)data, length);
 		crypto_digest_update(ctx(tfm)->fallback_tfm, &sg, 1);
 		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);

 	((uint32_t *)result)[0] = 0x67452301;
 	((uint32_t *)result)[1] = 0xEFCDAB89;
 	((uint32_t *)result)[2] = 0x98BADCFE;
 	((uint32_t *)result)[3] = 0x10325476;
 	((uint32_t *)result)[4] = 0xC3D2E1F0;

 	asm volatile (".byte 0xf3,0x0f,0xa6,0xc8" /* rep xsha1 */
 		      : "+S"(in), "+D"(result)
 		      : "c"(count), "a"(0));

 	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);

 	((uint32_t *)result)[0] = 0x6A09E667;
 	((uint32_t *)result)[1] = 0xBB67AE85;
 	((uint32_t *)result)[2] = 0x3C6EF372;
 	((uint32_t *)result)[3] = 0xA54FF53A;
 	((uint32_t *)result)[4] = 0x510E527F;
 	((uint32_t *)result)[5] = 0x9B05688C;
 	((uint32_t *)result)[6] = 0x1F83D9AB;
 	((uint32_t *)result)[7] = 0x5BE0CD19;

 	asm volatile (".byte 0xf3,0x0f,0xa6,0xd0" /* rep xsha256 */
 		      : "+S"(in), "+D"(result)
 		      : "c"(count), "a"(0));

 	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)) {
 		BUG_ON(!ctx(tfm)->fallback_tfm);
 		crypto_digest_final(ctx(tfm)->fallback_tfm, 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)
 {
 	/* 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. */
 	ctx(tfm)->fallback_tfm = crypto_alloc_tfm(fallback_driver_name, 0);
 	if (!ctx(tfm)->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 -ENOENT;
 	}

 	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, sha1_fallback);
 }

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

 	return padlock_cra_init(tfm, sha256_fallback);
 }

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

 	BUG_ON(!ctx(tfm)->fallback_tfm);
 	crypto_free_tfm(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,
 	.cra_blocksize		=	SHA1_HMAC_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,
 	.cra_blocksize		=	SHA256_HMAC_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 void __init padlock_sha_check_fallbacks(void)
 {
 	static struct crypto_tfm *tfm_sha1, *tfm_sha256;

 	/* We'll try to allocate one TFM for each fallback
 	 * to test that the modules are available. */
 	tfm_sha1 = crypto_alloc_tfm(sha1_fallback, 0);
 	if (!tfm_sha1) {
 		printk(KERN_WARNING PFX "Couldn't load fallback module for '%s'. Tried '%s'.\n",
 		       sha1_alg.cra_name, sha1_fallback);
 	} else {
 		printk(KERN_NOTICE PFX "Fallback for '%s' is driver '%s' (prio=%d)\n", sha1_alg.cra_name,
 		       crypto_tfm_alg_driver_name(tfm_sha1), crypto_tfm_alg_priority(tfm_sha1));
 		crypto_free_tfm(tfm_sha1);
 	}

 	tfm_sha256 = crypto_alloc_tfm(sha256_fallback, 0);
 	if (!tfm_sha256) {
 		printk(KERN_WARNING PFX "Couldn't load fallback module for '%s'. Tried '%s'.\n",
 		       sha256_alg.cra_name, sha256_fallback);
 	} else {
 		printk(KERN_NOTICE PFX "Fallback for '%s' is driver '%s' (prio=%d)\n", sha256_alg.cra_name,
 		       crypto_tfm_alg_driver_name(tfm_sha256), crypto_tfm_alg_priority(tfm_sha256));
 		crypto_free_tfm(tfm_sha256);
 	}
 }

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

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

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

 	padlock_sha_check_fallbacks();

 	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-padlock");
 MODULE_ALIAS("sha256-padlock");
	/*
	* 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 <linux/module.h>
	#include <linux/init.h>
	#include <linux/errno.h>
	#include <linux/crypto.h>
	#include <linux/cryptohash.h>
	#include <linux/interrupt.h>
	#include <linux/kernel.h>
	#include <linux/scatterlist.h>
	#include "padlock.h"

	#define SHA1_DEFAULT_FALLBACK "sha1-generic"
	#define SHA1_DIGEST_SIZE 20
	#define SHA1_HMAC_BLOCK_SIZE 64

	#define SHA256_DEFAULT_FALLBACK "sha256-generic"
	#define SHA256_DIGEST_SIZE 32
	#define SHA256_HMAC_BLOCK_SIZE 64

	static char *sha1_fallback = SHA1_DEFAULT_FALLBACK;
	static char *sha256_fallback = SHA256_DEFAULT_FALLBACK;

	module_param(sha1_fallback, charp, 0644);
	module_param(sha256_fallback, charp, 0644);

	MODULE_PARM_DESC(sha1_fallback, "Fallback driver for SHA1. Default is "
	SHA1_DEFAULT_FALLBACK);
	MODULE_PARM_DESC(sha256_fallback, "Fallback driver for SHA256. Default is "
	SHA256_DEFAULT_FALLBACK);

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

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

	BUG_ON(!ctx(tfm)->fallback_tfm);

	crypto_digest_init(ctx(tfm)->fallback_tfm);
	if (ctx(tfm)->data && ctx(tfm)->used) {
	struct scatterlist sg;

	sg_set_buf(&sg, ctx(tfm)->data, ctx(tfm)->used);
	crypto_digest_update(ctx(tfm)->fallback_tfm, &sg, 1);
	}

	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;
	BUG_ON(!ctx(tfm)->fallback_tfm);
	sg_set_buf(&sg, (uint8_t *)data, length);
	crypto_digest_update(ctx(tfm)->fallback_tfm, &sg, 1);
	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);

	((uint32_t *)result)[0] = 0x67452301;
	((uint32_t *)result)[1] = 0xEFCDAB89;
	((uint32_t *)result)[2] = 0x98BADCFE;
	((uint32_t *)result)[3] = 0x10325476;
	((uint32_t *)result)[4] = 0xC3D2E1F0;

	asm volatile (".byte 0xf3,0x0f,0xa6,0xc8" /* rep xsha1 */
	: "+S"(in), "+D"(result)
	: "c"(count), "a"(0));

	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);

	((uint32_t *)result)[0] = 0x6A09E667;
	((uint32_t *)result)[1] = 0xBB67AE85;
	((uint32_t *)result)[2] = 0x3C6EF372;
	((uint32_t *)result)[3] = 0xA54FF53A;
	((uint32_t *)result)[4] = 0x510E527F;
	((uint32_t *)result)[5] = 0x9B05688C;
	((uint32_t *)result)[6] = 0x1F83D9AB;
	((uint32_t *)result)[7] = 0x5BE0CD19;

	asm volatile (".byte 0xf3,0x0f,0xa6,0xd0" /* rep xsha256 */
	: "+S"(in), "+D"(result)
	: "c"(count), "a"(0));

	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)) {
	BUG_ON(!ctx(tfm)->fallback_tfm);
	crypto_digest_final(ctx(tfm)->fallback_tfm, 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)
	{
	/* 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. */
	ctx(tfm)->fallback_tfm = crypto_alloc_tfm(fallback_driver_name, 0);
	if (!ctx(tfm)->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 -ENOENT;
	}

	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, sha1_fallback);
	}

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

	return padlock_cra_init(tfm, sha256_fallback);
	}

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

	BUG_ON(!ctx(tfm)->fallback_tfm);
	crypto_free_tfm(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,
	.cra_blocksize = SHA1_HMAC_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,
	.cra_blocksize = SHA256_HMAC_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 void __init padlock_sha_check_fallbacks(void)
	{
	static struct crypto_tfm tfm_sha1, tfm_sha256;

	/* We'll try to allocate one TFM for each fallback
	* to test that the modules are available. */
	tfm_sha1 = crypto_alloc_tfm(sha1_fallback, 0);
	if (!tfm_sha1) {
	printk(KERN_WARNING PFX "Couldn't load fallback module for '%s'. Tried '%s'.\n",
	sha1_alg.cra_name, sha1_fallback);
	} else {
	printk(KERN_NOTICE PFX "Fallback for '%s' is driver '%s' (prio=%d)\n", sha1_alg.cra_name,
	crypto_tfm_alg_driver_name(tfm_sha1), crypto_tfm_alg_priority(tfm_sha1));
	crypto_free_tfm(tfm_sha1);
	}

	tfm_sha256 = crypto_alloc_tfm(sha256_fallback, 0);
	if (!tfm_sha256) {
	printk(KERN_WARNING PFX "Couldn't load fallback module for '%s'. Tried '%s'.\n",
	sha256_alg.cra_name, sha256_fallback);
	} else {
	printk(KERN_NOTICE PFX "Fallback for '%s' is driver '%s' (prio=%d)\n", sha256_alg.cra_name,
	crypto_tfm_alg_driver_name(tfm_sha256), crypto_tfm_alg_priority(tfm_sha256));
	crypto_free_tfm(tfm_sha256);
	}
	}

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

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

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

	padlock_sha_check_fallbacks();

	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-padlock");
	MODULE_ALIAS("sha256-padlock");