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[2/6] crypto: crc32c-generic - remove cra_alignmask

Message ID 20180520050742.5008-3-ebiggers3@gmail.com (mailing list archive)
State Accepted
Delegated to: Herbert Xu
Headers show

Commit Message

Eric Biggers May 20, 2018, 5:07 a.m. UTC 
From: Eric Biggers <ebiggers@google.com>

crc32c-generic sets an alignmask, but actually its ->update() works with
any alignment; only its ->setkey() and outputting the final digest
assume an alignment.  To prevent the buffer from having to be aligned by
the crypto API for just these cases, switch these cases over to the
unaligned access macros and remove the cra_alignmask.  Note that this
also makes crc32c-generic more consistent with crc32-generic.

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 crypto/crc32c_generic.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)
diff mbox

Patch

diff --git a/crypto/crc32c_generic.c b/crypto/crc32c_generic.c
index 372320399622..7283066ecc98 100644
--- a/crypto/crc32c_generic.c
+++ b/crypto/crc32c_generic.c
@@ -35,6 +35,7 @@ 
  *
  */
 
+#include <asm/unaligned.h>
 #include <crypto/internal/hash.h>
 #include <linux/init.h>
 #include <linux/module.h>
@@ -82,7 +83,7 @@  static int chksum_setkey(struct crypto_shash *tfm, const u8 *key,
 		crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
 		return -EINVAL;
 	}
-	mctx->key = le32_to_cpu(*(__le32 *)key);
+	mctx->key = get_unaligned_le32(key);
 	return 0;
 }
 
@@ -99,13 +100,13 @@  static int chksum_final(struct shash_desc *desc, u8 *out)
 {
 	struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
 
-	*(__le32 *)out = ~cpu_to_le32p(&ctx->crc);
+	put_unaligned_le32(~ctx->crc, out);
 	return 0;
 }
 
 static int __chksum_finup(u32 *crcp, const u8 *data, unsigned int len, u8 *out)
 {
-	*(__le32 *)out = ~cpu_to_le32(__crc32c_le(*crcp, data, len));
+	put_unaligned_le32(~__crc32c_le(*crcp, data, len), out);
 	return 0;
 }
 
@@ -148,7 +149,6 @@  static struct shash_alg alg = {
 		.cra_priority		=	100,
 		.cra_flags		=	CRYPTO_ALG_OPTIONAL_KEY,
 		.cra_blocksize		=	CHKSUM_BLOCK_SIZE,
-		.cra_alignmask		=	3,
 		.cra_ctxsize		=	sizeof(struct chksum_ctx),
 		.cra_module		=	THIS_MODULE,
 		.cra_init		=	crc32c_cra_init,