Commit 28ce728a authored by Herbert Xu's avatar Herbert Xu
Browse files

[CRYPTO] padlock: Added block cipher versions of CBC/ECB 



This patch adds block cipher algorithms for cbc(aes) and ecb(aes) for
the PadLock device.  Once all users to the old cipher type have been
converted the old cbc/ecb PadLock operations will be removed.

Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent db131ef9

drivers/crypto/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -27,6 +27,7 @@ config CRYPTO_DEV_PADLOCK 
config CRYPTO_DEV_PADLOCK_AES

	tristate "PadLock driver for AES algorithm"

	depends on CRYPTO_DEV_PADLOCK

	select CRYPTO_BLKCIPHER

	default m

	help

	  Use VIA PadLock for AES algorithm.

drivers/crypto/padlock-aes.c

+167 −7
Original line number Diff line number Diff line
@@ -43,11 +43,11 @@ 
 * ---------------------------------------------------------------------------

 */



#include <crypto/algapi.h>

#include <linux/module.h>

#include <linux/init.h>

#include <linux/types.h>

#include <linux/errno.h>

#include <linux/crypto.h>

#include <linux/interrupt.h>

#include <linux/kernel.h>

#include <asm/byteorder.h>
@@ -297,9 +297,9 @@ aes_hw_extkey_available(uint8_t key_len) 
	return 0;

}



static inline struct aes_ctx *aes_ctx(struct crypto_tfm *tfm)

static inline struct aes_ctx *aes_ctx_common(void *ctx)

{

	unsigned long addr = (unsigned long)crypto_tfm_ctx(tfm);

	unsigned long addr = (unsigned long)ctx;

	unsigned long align = PADLOCK_ALIGNMENT;



	if (align <= crypto_tfm_ctx_alignment())
@@ -307,6 +307,16 @@ static inline struct aes_ctx *aes_ctx(struct crypto_tfm *tfm) 
	return (struct aes_ctx *)ALIGN(addr, align);

}



static inline struct aes_ctx *aes_ctx(struct crypto_tfm *tfm)

{

	return aes_ctx_common(crypto_tfm_ctx(tfm));

}



static inline struct aes_ctx *blk_aes_ctx(struct crypto_blkcipher *tfm)

{

	return aes_ctx_common(crypto_blkcipher_ctx(tfm));

}



static int aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,

		       unsigned int key_len)

{
@@ -507,6 +517,141 @@ static struct crypto_alg aes_alg = { 
	}

};



static int ecb_aes_encrypt(struct blkcipher_desc *desc,

			   struct scatterlist *dst, struct scatterlist *src,

			   unsigned int nbytes)

{

	struct aes_ctx *ctx = blk_aes_ctx(desc->tfm);

	struct blkcipher_walk walk;

	int err;



	blkcipher_walk_init(&walk, dst, src, nbytes);

	err = blkcipher_walk_virt(desc, &walk);



	while ((nbytes = walk.nbytes)) {

		padlock_xcrypt_ecb(walk.src.virt.addr, walk.dst.virt.addr,

				   ctx->E, &ctx->cword.encrypt,

				   nbytes / AES_BLOCK_SIZE);

		nbytes &= AES_BLOCK_SIZE - 1;

		err = blkcipher_walk_done(desc, &walk, nbytes);

	}



	return err;

}



static int ecb_aes_decrypt(struct blkcipher_desc *desc,

			   struct scatterlist *dst, struct scatterlist *src,

			   unsigned int nbytes)

{

	struct aes_ctx *ctx = blk_aes_ctx(desc->tfm);

	struct blkcipher_walk walk;

	int err;



	blkcipher_walk_init(&walk, dst, src, nbytes);

	err = blkcipher_walk_virt(desc, &walk);



	while ((nbytes = walk.nbytes)) {

		padlock_xcrypt_ecb(walk.src.virt.addr, walk.dst.virt.addr,

				   ctx->D, &ctx->cword.decrypt,

				   nbytes / AES_BLOCK_SIZE);

		nbytes &= AES_BLOCK_SIZE - 1;

		err = blkcipher_walk_done(desc, &walk, nbytes);

	}



	return err;

}



static struct crypto_alg ecb_aes_alg = {

	.cra_name		=	"ecb(aes)",

	.cra_driver_name	=	"ecb-aes-padlock",

	.cra_priority		=	PADLOCK_COMPOSITE_PRIORITY,

	.cra_flags		=	CRYPTO_ALG_TYPE_BLKCIPHER,

	.cra_blocksize		=	AES_BLOCK_SIZE,

	.cra_ctxsize		=	sizeof(struct aes_ctx),

	.cra_alignmask		=	PADLOCK_ALIGNMENT - 1,

	.cra_type		=	&crypto_blkcipher_type,

	.cra_module		=	THIS_MODULE,

	.cra_list		=	LIST_HEAD_INIT(ecb_aes_alg.cra_list),

	.cra_u			=	{

		.blkcipher = {

			.min_keysize		=	AES_MIN_KEY_SIZE,

			.max_keysize		=	AES_MAX_KEY_SIZE,

			.setkey	   		= 	aes_set_key,

			.encrypt		=	ecb_aes_encrypt,

			.decrypt		=	ecb_aes_decrypt,

		}

	}

};



static int cbc_aes_encrypt(struct blkcipher_desc *desc,

			   struct scatterlist *dst, struct scatterlist *src,

			   unsigned int nbytes)

{

	struct aes_ctx *ctx = blk_aes_ctx(desc->tfm);

	struct blkcipher_walk walk;

	int err;



	blkcipher_walk_init(&walk, dst, src, nbytes);

	err = blkcipher_walk_virt(desc, &walk);



	while ((nbytes = walk.nbytes)) {

		u8 *iv = padlock_xcrypt_cbc(walk.src.virt.addr,

					    walk.dst.virt.addr, ctx->E,

					    walk.iv, &ctx->cword.encrypt,

					    nbytes / AES_BLOCK_SIZE);

		memcpy(walk.iv, iv, AES_BLOCK_SIZE);

		nbytes &= AES_BLOCK_SIZE - 1;

		err = blkcipher_walk_done(desc, &walk, nbytes);

	}



	return err;

}



static int cbc_aes_decrypt(struct blkcipher_desc *desc,

			   struct scatterlist *dst, struct scatterlist *src,

			   unsigned int nbytes)

{

	struct aes_ctx *ctx = blk_aes_ctx(desc->tfm);

	struct blkcipher_walk walk;

	int err;



	blkcipher_walk_init(&walk, dst, src, nbytes);

	err = blkcipher_walk_virt(desc, &walk);



	while ((nbytes = walk.nbytes)) {

		padlock_xcrypt_cbc(walk.src.virt.addr, walk.dst.virt.addr,

				   ctx->D, walk.iv, &ctx->cword.decrypt,

				   nbytes / AES_BLOCK_SIZE);

		nbytes &= AES_BLOCK_SIZE - 1;

		err = blkcipher_walk_done(desc, &walk, nbytes);

	}



	return err;

}



static struct crypto_alg cbc_aes_alg = {

	.cra_name		=	"cbc(aes)",

	.cra_driver_name	=	"cbc-aes-padlock",

	.cra_priority		=	PADLOCK_COMPOSITE_PRIORITY,

	.cra_flags		=	CRYPTO_ALG_TYPE_BLKCIPHER,

	.cra_blocksize		=	AES_BLOCK_SIZE,

	.cra_ctxsize		=	sizeof(struct aes_ctx),

	.cra_alignmask		=	PADLOCK_ALIGNMENT - 1,

	.cra_type		=	&crypto_blkcipher_type,

	.cra_module		=	THIS_MODULE,

	.cra_list		=	LIST_HEAD_INIT(cbc_aes_alg.cra_list),

	.cra_u			=	{

		.blkcipher = {

			.min_keysize		=	AES_MIN_KEY_SIZE,

			.max_keysize		=	AES_MAX_KEY_SIZE,

			.ivsize			=	AES_BLOCK_SIZE,

			.setkey	   		= 	aes_set_key,

			.encrypt		=	cbc_aes_encrypt,

			.decrypt		=	cbc_aes_decrypt,

		}

	}

};



static int __init padlock_init(void)

{

	int ret;
@@ -522,18 +667,33 @@ static int __init padlock_init(void) 
	}



	gen_tabs();

	if ((ret = crypto_register_alg(&aes_alg))) {

		printk(KERN_ERR PFX "VIA PadLock AES initialization failed.\n");

		return ret;

	}

	if ((ret = crypto_register_alg(&aes_alg)))

		goto aes_err;



	if ((ret = crypto_register_alg(&ecb_aes_alg)))

		goto ecb_aes_err;



	if ((ret = crypto_register_alg(&cbc_aes_alg)))

		goto cbc_aes_err;



	printk(KERN_NOTICE PFX "Using VIA PadLock ACE for AES algorithm.\n");



out:

	return ret;



cbc_aes_err:

	crypto_unregister_alg(&ecb_aes_alg);

ecb_aes_err:

	crypto_unregister_alg(&aes_alg);

aes_err:

	printk(KERN_ERR PFX "VIA PadLock AES initialization failed.\n");

	goto out;

}



static void __exit padlock_fini(void)

{

	crypto_unregister_alg(&cbc_aes_alg);

	crypto_unregister_alg(&ecb_aes_alg);

	crypto_unregister_alg(&aes_alg);

}

drivers/crypto/padlock.h

+1 −0
Original line number Diff line number Diff line
@@ -18,5 +18,6 @@ 
#define PFX	"padlock: "



#define PADLOCK_CRA_PRIORITY	300

#define PADLOCK_COMPOSITE_PRIORITY 400



#endif	/* _CRYPTO_PADLOCK_H */

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