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Commit 28e8c3ad authored by Herbert Xu's avatar Herbert Xu Committed by David S. Miller
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[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
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+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,
		}
	}
};