Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 28e8c3ad authored by Herbert Xu's avatar Herbert Xu Committed by David S. Miller
Browse files

[PADLOCK] Implement multi-block operations 



By operating on multiple blocks at once, we expect to extract more
performance out of the VIA Padlock.

Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 6789b2dc

drivers/crypto/padlock-aes.c

+53 −2
Original line number Diff line number Diff line
@@ -390,7 +390,7 @@ aes_set_key(void *ctx_arg, const uint8_t *in_key, unsigned int key_len, uint32_t 


/* ====== Encryption/decryption routines ====== */



/* This is the real call to PadLock. */

/* These are the real call to PadLock. */

static inline void padlock_xcrypt_ecb(const u8 *input, u8 *output, void *key,

				      void *control_word, u32 count)

{
@@ -400,6 +400,17 @@ static inline void padlock_xcrypt_ecb(const u8 *input, u8 *output, void *key, 
		      : "d"(control_word), "b"(key), "c"(count));

}



static inline void padlock_xcrypt_cbc(const u8 *input, u8 *output, void *key,

				      u8 *iv, void *control_word, u32 count)

{

	/* Enforce key reload. */

	asm volatile ("pushfl; popfl");

	/* rep xcryptcbc */

	asm volatile (".byte 0xf3,0x0f,0xa7,0xd0"

		      : "+S" (input), "+D" (output), "+a" (iv)

		      : "d" (control_word), "b" (key), "c" (count));

}



static void

aes_encrypt(void *ctx_arg, uint8_t *out, const uint8_t *in)

{
@@ -414,6 +425,42 @@ aes_decrypt(void *ctx_arg, uint8_t *out, const uint8_t *in) 
	padlock_xcrypt_ecb(in, out, ctx->D, &ctx->cword.decrypt, 1);

}



static unsigned int aes_encrypt_ecb(const struct cipher_desc *desc, u8 *out,

				    const u8 *in, unsigned int nbytes)

{

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

	padlock_xcrypt_ecb(in, out, ctx->E, &ctx->cword.encrypt,

			   nbytes / AES_BLOCK_SIZE);

	return nbytes & ~(AES_BLOCK_SIZE - 1);

}



static unsigned int aes_decrypt_ecb(const struct cipher_desc *desc, u8 *out,

				    const u8 *in, unsigned int nbytes)

{

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

	padlock_xcrypt_ecb(in, out, ctx->D, &ctx->cword.decrypt,

			   nbytes / AES_BLOCK_SIZE);

	return nbytes & ~(AES_BLOCK_SIZE - 1);

}



static unsigned int aes_encrypt_cbc(const struct cipher_desc *desc, u8 *out,

				    const u8 *in, unsigned int nbytes)

{

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

	padlock_xcrypt_cbc(in, out, ctx->E, desc->info, &ctx->cword.encrypt,

			   nbytes / AES_BLOCK_SIZE);

	return nbytes & ~(AES_BLOCK_SIZE - 1);

}



static unsigned int aes_decrypt_cbc(const struct cipher_desc *desc, u8 *out,

				    const u8 *in, unsigned int nbytes)

{

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

	padlock_xcrypt_cbc(in, out, ctx->D, desc->info, &ctx->cword.decrypt,

			   nbytes / AES_BLOCK_SIZE);

	return nbytes & ~(AES_BLOCK_SIZE - 1);

}



static struct crypto_alg aes_alg = {

	.cra_name		=	"aes",

	.cra_flags		=	CRYPTO_ALG_TYPE_CIPHER,
@@ -429,7 +476,11 @@ static struct crypto_alg aes_alg = { 
			.cia_max_keysize	=	AES_MAX_KEY_SIZE,

			.cia_setkey	   	= 	aes_set_key,

			.cia_encrypt	 	=	aes_encrypt,

			.cia_decrypt	  	=	aes_decrypt

			.cia_decrypt	  	=	aes_decrypt,

			.cia_encrypt_ecb 	=	aes_encrypt_ecb,

			.cia_decrypt_ecb  	=	aes_decrypt_ecb,

			.cia_encrypt_cbc 	=	aes_encrypt_cbc,

			.cia_decrypt_cbc  	=	aes_decrypt_cbc,

		}

	}

};