From: Ard Biesheuvel <ardb@kernel.org>
To: linux-crypto@vger.kernel.org
Cc: herbert@gondor.apana.org.au, ebiggers@kernel.org,
Ard Biesheuvel <ardb@kernel.org>
Subject: [PATCH 5/9] crypto: camellia - use unaligned accessors instead of alignmask
Date: Mon, 1 Feb 2021 19:02:33 +0100 [thread overview]
Message-ID: <20210201180237.3171-6-ardb@kernel.org> (raw)
In-Reply-To: <20210201180237.3171-1-ardb@kernel.org>
Instead of using an alignmask of 0x3 to ensure 32-bit alignment of the
Camellia input and output blocks, which propagates to mode drivers, and
results in pointless copying on architectures that don't care about
alignment, use the unaligned accessors, which will do the right thing on
each respective architecture, avoiding the need for double buffering.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
crypto/camellia_generic.c | 45 +++++++-------------
1 file changed, 16 insertions(+), 29 deletions(-)
diff --git a/crypto/camellia_generic.c b/crypto/camellia_generic.c
index 0b9f409f7370..fd1a88af9e77 100644
--- a/crypto/camellia_generic.c
+++ b/crypto/camellia_generic.c
@@ -9,14 +9,6 @@
* https://info.isl.ntt.co.jp/crypt/eng/camellia/specifications.html
*/
-/*
- *
- * NOTE --- NOTE --- NOTE --- NOTE
- * This implementation assumes that all memory addresses passed
- * as parameters are four-byte aligned.
- *
- */
-
#include <linux/crypto.h>
#include <linux/errno.h>
#include <linux/init.h>
@@ -994,16 +986,14 @@ camellia_set_key(struct crypto_tfm *tfm, const u8 *in_key,
static void camellia_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
{
const struct camellia_ctx *cctx = crypto_tfm_ctx(tfm);
- const __be32 *src = (const __be32 *)in;
- __be32 *dst = (__be32 *)out;
unsigned int max;
u32 tmp[4];
- tmp[0] = be32_to_cpu(src[0]);
- tmp[1] = be32_to_cpu(src[1]);
- tmp[2] = be32_to_cpu(src[2]);
- tmp[3] = be32_to_cpu(src[3]);
+ tmp[0] = get_unaligned_be32(in);
+ tmp[1] = get_unaligned_be32(in + 4);
+ tmp[2] = get_unaligned_be32(in + 8);
+ tmp[3] = get_unaligned_be32(in + 12);
if (cctx->key_length == 16)
max = 24;
@@ -1013,25 +1003,23 @@ static void camellia_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
camellia_do_encrypt(cctx->key_table, tmp, max);
/* do_encrypt returns 0,1 swapped with 2,3 */
- dst[0] = cpu_to_be32(tmp[2]);
- dst[1] = cpu_to_be32(tmp[3]);
- dst[2] = cpu_to_be32(tmp[0]);
- dst[3] = cpu_to_be32(tmp[1]);
+ put_unaligned_be32(tmp[2], out);
+ put_unaligned_be32(tmp[3], out + 4);
+ put_unaligned_be32(tmp[0], out + 8);
+ put_unaligned_be32(tmp[1], out + 12);
}
static void camellia_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
{
const struct camellia_ctx *cctx = crypto_tfm_ctx(tfm);
- const __be32 *src = (const __be32 *)in;
- __be32 *dst = (__be32 *)out;
unsigned int max;
u32 tmp[4];
- tmp[0] = be32_to_cpu(src[0]);
- tmp[1] = be32_to_cpu(src[1]);
- tmp[2] = be32_to_cpu(src[2]);
- tmp[3] = be32_to_cpu(src[3]);
+ tmp[0] = get_unaligned_be32(in);
+ tmp[1] = get_unaligned_be32(in + 4);
+ tmp[2] = get_unaligned_be32(in + 8);
+ tmp[3] = get_unaligned_be32(in + 12);
if (cctx->key_length == 16)
max = 24;
@@ -1041,10 +1029,10 @@ static void camellia_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
camellia_do_decrypt(cctx->key_table, tmp, max);
/* do_decrypt returns 0,1 swapped with 2,3 */
- dst[0] = cpu_to_be32(tmp[2]);
- dst[1] = cpu_to_be32(tmp[3]);
- dst[2] = cpu_to_be32(tmp[0]);
- dst[3] = cpu_to_be32(tmp[1]);
+ put_unaligned_be32(tmp[2], out);
+ put_unaligned_be32(tmp[3], out + 4);
+ put_unaligned_be32(tmp[0], out + 8);
+ put_unaligned_be32(tmp[1], out + 12);
}
static struct crypto_alg camellia_alg = {
@@ -1054,7 +1042,6 @@ static struct crypto_alg camellia_alg = {
.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
.cra_blocksize = CAMELLIA_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct camellia_ctx),
- .cra_alignmask = 3,
.cra_module = THIS_MODULE,
.cra_u = {
.cipher = {
--
2.20.1
next prev parent reply other threads:[~2021-02-01 18:04 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-01 18:02 [PATCH 0/9] crypto: fix alignmask handling Ard Biesheuvel
2021-02-01 18:02 ` [PATCH 1/9] crypto: michael_mic - fix broken misalignment handling Ard Biesheuvel
2021-02-01 18:02 ` [PATCH 2/9] crypto: serpent - get rid of obsolete tnepres variant Ard Biesheuvel
2021-02-01 18:02 ` [PATCH 3/9] crypto: serpent - use unaligned accessors instead of alignmask Ard Biesheuvel
2021-02-01 18:02 ` [PATCH 4/9] crypto: blowfish " Ard Biesheuvel
2021-02-01 18:02 ` Ard Biesheuvel [this message]
2021-02-01 18:02 ` [PATCH 6/9] crypto: cast5 " Ard Biesheuvel
2021-02-01 18:02 ` [PATCH 7/9] crypto: cast6 " Ard Biesheuvel
2021-02-01 18:02 ` [PATCH 8/9] crypto: fcrypt - drop unneeded alignmask Ard Biesheuvel
2021-02-01 18:02 ` [PATCH 9/9] crypto: twofish - use unaligned accessors instead of alignmask Ard Biesheuvel
2021-02-02 22:20 ` [PATCH 0/9] crypto: fix alignmask handling Eric Biggers
2021-02-03 9:37 ` Ard Biesheuvel
2021-02-03 11:19 ` Herbert Xu
2021-02-03 11:22 ` Ard Biesheuvel
2021-02-10 7:22 ` Herbert Xu
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