crypto: crc32c-generic - remove cra_alignmask

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 <[email protected]> Signed-off-by: Herbert Xu <[email protected]>
ashr · May 26, 2018 · 7bcfb13 · 7bcfb13
1 parent fffe7d9
commit 7bcfb13
Showing 1 changed file with 4 additions and 4 deletions.
diff --git 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,