Commit 1b2c6a51 authored by Ard Biesheuvel's avatar Ard Biesheuvel Committed by Herbert Xu
Browse files

crypto: x86/poly1305 - depend on generic library not generic shash 



Remove the dependency on the generic Poly1305 driver. Instead, depend
on the generic library so that we only reuse code without pulling in
the generic skcipher implementation as well.

While at it, remove the logic that prefers the non-SIMD path for short
inputs - this is no longer necessary after recent FPU handling changes
on x86.

Since this removes the last remaining user of the routines exported
by the generic shash driver, unexport them and make them static.

Signed-off-by: default avatarArd Biesheuvel <ardb@kernel.org>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent a1d93064

arch/x86/crypto/poly1305_glue.c

+55 −11
Original line number Diff line number Diff line
@@ -34,6 +34,24 @@ static void poly1305_simd_mult(u32 *a, const u32 *b) 
	poly1305_block_sse2(a, m, b, 1);

}



static unsigned int poly1305_scalar_blocks(struct poly1305_desc_ctx *dctx,

					   const u8 *src, unsigned int srclen)

{

	unsigned int datalen;



	if (unlikely(!dctx->sset)) {

		datalen = crypto_poly1305_setdesckey(dctx, src, srclen);

		src += srclen - datalen;

		srclen = datalen;

	}

	if (srclen >= POLY1305_BLOCK_SIZE) {

		poly1305_core_blocks(&dctx->h, dctx->r, src,

				     srclen / POLY1305_BLOCK_SIZE, 1);

		srclen %= POLY1305_BLOCK_SIZE;

	}

	return srclen;

}



static unsigned int poly1305_simd_blocks(struct poly1305_desc_ctx *dctx,

					 const u8 *src, unsigned int srclen)

{
@@ -91,12 +109,6 @@ static int poly1305_simd_update(struct shash_desc *desc, 
	struct poly1305_desc_ctx *dctx = shash_desc_ctx(desc);

	unsigned int bytes;



	/* kernel_fpu_begin/end is costly, use fallback for small updates */

	if (srclen <= 288 || !crypto_simd_usable())

		return crypto_poly1305_update(desc, src, srclen);



	kernel_fpu_begin();



	if (unlikely(dctx->buflen)) {

		bytes = min(srclen, POLY1305_BLOCK_SIZE - dctx->buflen);

		memcpy(dctx->buf + dctx->buflen, src, bytes);
@@ -105,25 +117,57 @@ static int poly1305_simd_update(struct shash_desc *desc, 
		dctx->buflen += bytes;



		if (dctx->buflen == POLY1305_BLOCK_SIZE) {

			if (likely(crypto_simd_usable())) {

				kernel_fpu_begin();

				poly1305_simd_blocks(dctx, dctx->buf,

						     POLY1305_BLOCK_SIZE);

				kernel_fpu_end();

			} else {

				poly1305_scalar_blocks(dctx, dctx->buf,

						       POLY1305_BLOCK_SIZE);

			}

			dctx->buflen = 0;

		}

	}



	if (likely(srclen >= POLY1305_BLOCK_SIZE)) {

		if (likely(crypto_simd_usable())) {

			kernel_fpu_begin();

			bytes = poly1305_simd_blocks(dctx, src, srclen);

			kernel_fpu_end();

		} else {

			bytes = poly1305_scalar_blocks(dctx, src, srclen);

		}

		src += srclen - bytes;

		srclen = bytes;

	}



	kernel_fpu_end();



	if (unlikely(srclen)) {

		dctx->buflen = srclen;

		memcpy(dctx->buf, src, srclen);

	}

}



static int crypto_poly1305_init(struct shash_desc *desc)

{

	struct poly1305_desc_ctx *dctx = shash_desc_ctx(desc);



	poly1305_core_init(&dctx->h);

	dctx->buflen = 0;

	dctx->rset = 0;

	dctx->sset = false;



	return 0;

}



static int crypto_poly1305_final(struct shash_desc *desc, u8 *dst)

{

	struct poly1305_desc_ctx *dctx = shash_desc_ctx(desc);



	if (unlikely(!dctx->sset))

		return -ENOKEY;



	poly1305_final_generic(dctx, dst);

	return 0;

}

crypto/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -714,7 +714,7 @@ config CRYPTO_POLY1305 
config CRYPTO_POLY1305_X86_64

	tristate "Poly1305 authenticator algorithm (x86_64/SSE2/AVX2)"

	depends on X86 && 64BIT

	select CRYPTO_POLY1305

	select CRYPTO_LIB_POLY1305_GENERIC

	help

	  Poly1305 authenticator algorithm, RFC7539.

crypto/poly1305_generic.c

+4 −7
Original line number Diff line number Diff line
@@ -19,7 +19,7 @@ 
#include <linux/module.h>

#include <asm/unaligned.h>



int crypto_poly1305_init(struct shash_desc *desc)

static int crypto_poly1305_init(struct shash_desc *desc)

{

	struct poly1305_desc_ctx *dctx = shash_desc_ctx(desc);
@@ -30,7 +30,6 @@ int crypto_poly1305_init(struct shash_desc *desc) 


	return 0;

}

EXPORT_SYMBOL_GPL(crypto_poly1305_init);



static void poly1305_blocks(struct poly1305_desc_ctx *dctx, const u8 *src,

			    unsigned int srclen)
@@ -47,7 +46,7 @@ static void poly1305_blocks(struct poly1305_desc_ctx *dctx, const u8 *src, 
			     srclen / POLY1305_BLOCK_SIZE, 1);

}



int crypto_poly1305_update(struct shash_desc *desc,

static int crypto_poly1305_update(struct shash_desc *desc,

				  const u8 *src, unsigned int srclen)

{

	struct poly1305_desc_ctx *dctx = shash_desc_ctx(desc);
@@ -80,9 +79,8 @@ int crypto_poly1305_update(struct shash_desc *desc, 


	return 0;

}

EXPORT_SYMBOL_GPL(crypto_poly1305_update);



int crypto_poly1305_final(struct shash_desc *desc, u8 *dst)

static int crypto_poly1305_final(struct shash_desc *desc, u8 *dst)

{

	struct poly1305_desc_ctx *dctx = shash_desc_ctx(desc);
@@ -92,7 +90,6 @@ int crypto_poly1305_final(struct shash_desc *desc, u8 *dst) 
	poly1305_final_generic(dctx, dst);

	return 0;

}

EXPORT_SYMBOL_GPL(crypto_poly1305_final);



static struct shash_alg poly1305_alg = {

	.digestsize	= POLY1305_DIGEST_SIZE,

include/crypto/internal/poly1305.h

+0 −9
Original line number Diff line number Diff line
@@ -10,8 +10,6 @@ 
#include <linux/types.h>

#include <crypto/poly1305.h>



struct shash_desc;



/*

 * Poly1305 core functions.  These implement the ε-almost-∆-universal hash

 * function underlying the Poly1305 MAC, i.e. they don't add an encrypted nonce
@@ -28,13 +26,6 @@ void poly1305_core_blocks(struct poly1305_state *state, 
			  unsigned int nblocks, u32 hibit);

void poly1305_core_emit(const struct poly1305_state *state, void *dst);



/* Crypto API helper functions for the Poly1305 MAC */

int crypto_poly1305_init(struct shash_desc *desc);



int crypto_poly1305_update(struct shash_desc *desc,

			   const u8 *src, unsigned int srclen);

int crypto_poly1305_final(struct shash_desc *desc, u8 *dst);



/*

 * Poly1305 requires a unique key for each tag, which implies that we can't set

 * it on the tfm that gets accessed by multiple users simultaneously. Instead we

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