crypto: twofish - use unaligned accessors instead of alignmask

Instead of using an alignmask of 0x3 to ensure 32-bit alignment of the
Twofish 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>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/crypto/twofish_generic.c b/crypto/twofish_generic.c
index 4f7c033..86b2f06 100644 (file)
--- a/crypto/twofish_generic.c
+++ b/crypto/twofish_generic.c
@@ -24,7 +24,7 @@
  * Third Edition.
  */
 
-#include <asm/byteorder.h>
+#include <asm/unaligned.h>
 #include <crypto/twofish.h>
 #include <linux/module.h>
 #include <linux/init.h>
@@ -83,11 +83,11 @@
  * whitening subkey number m. */
 
 #define INPACK(n, x, m) \
-   x = le32_to_cpu(src[n]) ^ ctx->w[m]
+   x = get_unaligned_le32(in + (n) * 4) ^ ctx->w[m]
 
 #define OUTUNPACK(n, x, m) \
    x ^= ctx->w[m]; \
-   dst[n] = cpu_to_le32(x)
+   put_unaligned_le32(x, out + (n) * 4)
 
 
 
@@ -95,8 +95,6 @@
 static void twofish_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
 {
        struct twofish_ctx *ctx = crypto_tfm_ctx(tfm);
-       const __le32 *src = (const __le32 *)in;
-       __le32 *dst = (__le32 *)out;
 
        /* The four 32-bit chunks of the text. */
        u32 a, b, c, d;
@@ -132,8 +130,6 @@ static void twofish_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
 static void twofish_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
 {
        struct twofish_ctx *ctx = crypto_tfm_ctx(tfm);
-       const __le32 *src = (const __le32 *)in;
-       __le32 *dst = (__le32 *)out;
   
        /* The four 32-bit chunks of the text. */
        u32 a, b, c, d;
@@ -172,7 +168,6 @@ static struct crypto_alg alg = {
        .cra_flags          =   CRYPTO_ALG_TYPE_CIPHER,
        .cra_blocksize      =   TF_BLOCK_SIZE,
        .cra_ctxsize        =   sizeof(struct twofish_ctx),
-       .cra_alignmask      =   3,
        .cra_module         =   THIS_MODULE,
        .cra_u              =   { .cipher = {
        .cia_min_keysize    =   TF_MIN_KEY_SIZE,