drivers/crypto/padlock-sha.c - kernel/msm-4.19 - Gitiles

 /*
  * 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_ctx {
 	char		*data;
 	size_t		used;
 	int		bypass;
 	void (*f_sha_padlock)(const char *in, char *out, int count);
 	struct shash_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 int padlock_sha_bypass(struct crypto_tfm *tfm)
 {
 	int err = 0;

 	if (ctx(tfm)->bypass)
 		goto out;

 	err = crypto_shash_init(ctx(tfm)->fallback);
 	if (err)
 		goto out;

 	if (ctx(tfm)->data && ctx(tfm)->used)
 		err = crypto_shash_update(ctx(tfm)->fallback, ctx(tfm)->data,
 					  ctx(tfm)->used);

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

 out:
 	return err;
 }

 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)
 {
 	int err;

 	/* Our buffer is always one page. */
 	if (unlikely(!ctx(tfm)->bypass &&
 		     (ctx(tfm)->used + length > PAGE_SIZE))) {
 		err = padlock_sha_bypass(tfm);
 		BUG_ON(err);
 	}

 	if (unlikely(ctx(tfm)->bypass)) {
 		err = crypto_shash_update(ctx(tfm)->fallback, data, length);
 		BUG_ON(err);
 		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)
 {
 	int err;

 	if (unlikely(ctx(tfm)->bypass)) {
 		err = crypto_shash_final(ctx(tfm)->fallback, out);
 		BUG_ON(err);
 		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_shash *fallback_tfm;
 	int err = -ENOMEM;

 	/* 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)
 		goto out;

 	/* 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_free_page;
 	}

 	ctx(tfm)->fallback = kmalloc(sizeof(struct shash_desc) +
 				     crypto_shash_descsize(fallback_tfm),
 				     GFP_KERNEL);
 	if (!ctx(tfm)->fallback)
 		goto out_free_tfm;

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

 out_free_tfm:
 	crypto_free_shash(fallback_tfm);
 out_free_page:
 	free_page((unsigned long)(ctx(tfm)->data));
 out:
 	return err;
 }

 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_shash(ctx(tfm)->fallback->tfm);

 	kzfree(ctx(tfm)->fallback);
 }

 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-all");
 MODULE_ALIAS("sha256-all");
 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 <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_ctx {
	char *data;
	size_t used;
	int bypass;
	void (f_sha_padlock)(const char in, char *out, int count);
	struct shash_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 int padlock_sha_bypass(struct crypto_tfm *tfm)
	{
	int err = 0;

	if (ctx(tfm)->bypass)
	goto out;

	err = crypto_shash_init(ctx(tfm)->fallback);
	if (err)
	goto out;

	if (ctx(tfm)->data && ctx(tfm)->used)
	err = crypto_shash_update(ctx(tfm)->fallback, ctx(tfm)->data,
	ctx(tfm)->used);

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

	out:
	return err;
	}

	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)
	{
	int err;

	/* Our buffer is always one page. */
	if (unlikely(!ctx(tfm)->bypass &&
	(ctx(tfm)->used + length > PAGE_SIZE))) {
	err = padlock_sha_bypass(tfm);
	BUG_ON(err);
	}

	if (unlikely(ctx(tfm)->bypass)) {
	err = crypto_shash_update(ctx(tfm)->fallback, data, length);
	BUG_ON(err);
	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)
	{
	int err;

	if (unlikely(ctx(tfm)->bypass)) {
	err = crypto_shash_final(ctx(tfm)->fallback, out);
	BUG_ON(err);
	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_shash *fallback_tfm;
	int err = -ENOMEM;

	/* 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)
	goto out;

	/* 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_free_page;
	}

	ctx(tfm)->fallback = kmalloc(sizeof(struct shash_desc) +
	crypto_shash_descsize(fallback_tfm),
	GFP_KERNEL);
	if (!ctx(tfm)->fallback)
	goto out_free_tfm;

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

	out_free_tfm:
	crypto_free_shash(fallback_tfm);
	out_free_page:
	free_page((unsigned long)(ctx(tfm)->data));
	out:
	return err;
	}

	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_shash(ctx(tfm)->fallback->tfm);

	kzfree(ctx(tfm)->fallback);
	}

	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-all");
	MODULE_ALIAS("sha256-all");
	MODULE_ALIAS("sha1-padlock");
	MODULE_ALIAS("sha256-padlock");