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 <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/crypto/crc32c_generic.c b/crypto/crc32c_generic.c
index 372320399622df00f680dc160425d7ce7b85ff81..7283066ecc982c193a1ac658b5f28ddc62473e13 100644 (file)
--- 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,