Commit e79a3171 authored by Ard Biesheuvel's avatar Ard Biesheuvel Committed by Herbert Xu
Browse files

crypto: x86/chacha-sse3 - use unaligned loads for state array 



Due to the fact that the x86 port does not support allocating objects
on the stack with an alignment that exceeds 8 bytes, we have a rather
ugly hack in the x86 code for ChaCha to ensure that the state array is
aligned to 16 bytes, allowing the SSE3 implementation of the algorithm
to use aligned loads.

Given that the performance benefit of using of aligned loads appears to
be limited (~0.25% for 1k blocks using tcrypt on a Corei7-8650U), and
the fact that this hack has leaked into generic ChaCha code, let's just
remove it.

Cc: Martin Willi <martin@strongswan.org>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Eric Biggers <ebiggers@kernel.org>
Signed-off-by: default avatarArd Biesheuvel <ardb@kernel.org>
Reviewed-by: default avatarMartin Willi <martin@strongswan.org>
Reviewed-by: default avatarEric Biggers <ebiggers@google.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 06cc2afb

arch/x86/crypto/chacha-ssse3-x86_64.S

+8 −8
Original line number Diff line number Diff line
@@ -120,10 +120,10 @@ SYM_FUNC_START(chacha_block_xor_ssse3) 
	FRAME_BEGIN



	# x0..3 = s0..3

	movdqa		0x00(%rdi),%xmm0

	movdqa		0x10(%rdi),%xmm1

	movdqa		0x20(%rdi),%xmm2

	movdqa		0x30(%rdi),%xmm3

	movdqu		0x00(%rdi),%xmm0

	movdqu		0x10(%rdi),%xmm1

	movdqu		0x20(%rdi),%xmm2

	movdqu		0x30(%rdi),%xmm3

	movdqa		%xmm0,%xmm8

	movdqa		%xmm1,%xmm9

	movdqa		%xmm2,%xmm10
@@ -205,10 +205,10 @@ SYM_FUNC_START(hchacha_block_ssse3) 
	# %edx: nrounds

	FRAME_BEGIN



	movdqa		0x00(%rdi),%xmm0

	movdqa		0x10(%rdi),%xmm1

	movdqa		0x20(%rdi),%xmm2

	movdqa		0x30(%rdi),%xmm3

	movdqu		0x00(%rdi),%xmm0

	movdqu		0x10(%rdi),%xmm1

	movdqu		0x20(%rdi),%xmm2

	movdqu		0x30(%rdi),%xmm3



	mov		%edx,%r8d

	call		chacha_permute

arch/x86/crypto/chacha_glue.c

+2 −15
Original line number Diff line number Diff line
@@ -14,8 +14,6 @@ 
#include <linux/module.h>

#include <asm/simd.h>



#define CHACHA_STATE_ALIGN 16



asmlinkage void chacha_block_xor_ssse3(u32 *state, u8 *dst, const u8 *src,

				       unsigned int len, int nrounds);

asmlinkage void chacha_4block_xor_ssse3(u32 *state, u8 *dst, const u8 *src,
@@ -124,8 +122,6 @@ static void chacha_dosimd(u32 *state, u8 *dst, const u8 *src, 


void hchacha_block_arch(const u32 *state, u32 *stream, int nrounds)

{

	state = PTR_ALIGN(state, CHACHA_STATE_ALIGN);



	if (!static_branch_likely(&chacha_use_simd) || !crypto_simd_usable()) {

		hchacha_block_generic(state, stream, nrounds);

	} else {
@@ -138,8 +134,6 @@ EXPORT_SYMBOL(hchacha_block_arch); 


void chacha_init_arch(u32 *state, const u32 *key, const u8 *iv)

{

	state = PTR_ALIGN(state, CHACHA_STATE_ALIGN);



	chacha_init_generic(state, key, iv);

}

EXPORT_SYMBOL(chacha_init_arch);
@@ -147,8 +141,6 @@ EXPORT_SYMBOL(chacha_init_arch); 
void chacha_crypt_arch(u32 *state, u8 *dst, const u8 *src, unsigned int bytes,

		       int nrounds)

{

	state = PTR_ALIGN(state, CHACHA_STATE_ALIGN);



	if (!static_branch_likely(&chacha_use_simd) || !crypto_simd_usable() ||

	    bytes <= CHACHA_BLOCK_SIZE)

		return chacha_crypt_generic(state, dst, src, bytes, nrounds);
@@ -170,15 +162,12 @@ EXPORT_SYMBOL(chacha_crypt_arch); 
static int chacha_simd_stream_xor(struct skcipher_request *req,

				  const struct chacha_ctx *ctx, const u8 *iv)

{

	u32 *state, state_buf[16 + 2] __aligned(8);

	u32 state[CHACHA_STATE_WORDS] __aligned(8);

	struct skcipher_walk walk;

	int err;



	err = skcipher_walk_virt(&walk, req, false);



	BUILD_BUG_ON(CHACHA_STATE_ALIGN != 16);

	state = PTR_ALIGN(state_buf + 0, CHACHA_STATE_ALIGN);



	chacha_init_generic(state, ctx->key, iv);



	while (walk.nbytes > 0) {
@@ -217,12 +206,10 @@ static int xchacha_simd(struct skcipher_request *req) 
{

	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);

	struct chacha_ctx *ctx = crypto_skcipher_ctx(tfm);

	u32 *state, state_buf[16 + 2] __aligned(8);

	u32 state[CHACHA_STATE_WORDS] __aligned(8);

	struct chacha_ctx subctx;

	u8 real_iv[16];



	BUILD_BUG_ON(CHACHA_STATE_ALIGN != 16);

	state = PTR_ALIGN(state_buf + 0, CHACHA_STATE_ALIGN);

	chacha_init_generic(state, ctx->key, req->iv);



	if (req->cryptlen > CHACHA_BLOCK_SIZE && crypto_simd_usable()) {

include/crypto/chacha.h

+0 −4
Original line number Diff line number Diff line
@@ -25,11 +25,7 @@ 
#define CHACHA_BLOCK_SIZE	64

#define CHACHAPOLY_IV_SIZE	12



#ifdef CONFIG_X86_64

#define CHACHA_STATE_WORDS	((CHACHA_BLOCK_SIZE + 12) / sizeof(u32))

#else

#define CHACHA_STATE_WORDS	(CHACHA_BLOCK_SIZE / sizeof(u32))

#endif



/* 192-bit nonce, then 64-bit stream position */

#define XCHACHA_IV_SIZE		32

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