crypto: cast5 - use unaligned accessors instead of alignmask

Instead of using an alignmask of 0x3 to ensure 32-bit alignment of the
CAST5 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 <[e-mail]>
Signed-off-by: Herbert Xu <[e-mail]>

crypto/cast5_generic.c

···
 */
 
 
-#include <asm/byteorder.h>
+#include <asm/unaligned.h>
 #include <linux/init.h>
 #include <linux/crypto.h>
 #include <linux/module.h>
···
 
 void __cast5_encrypt(struct cast5_ctx *c, u8 *outbuf, const u8 *inbuf)
 {
-	const __be32 *src = (const __be32 *)inbuf;
-	__be32 *dst = (__be32 *)outbuf;
 	u32 l, r, t;
 	u32 I;			/* used by the Fx macros */
 	u32 *Km;
···
 	/* (L0,R0) <-- (m1...m64).  (Split the plaintext into left and
 	 * right 32-bit halves L0 = m1...m32 and R0 = m33...m64.)
 	 */
-	l = be32_to_cpu(src[0]);
-	r = be32_to_cpu(src[1]);
+	l = get_unaligned_be32(inbuf);
+	r = get_unaligned_be32(inbuf + 4);
 
 	/* (16 rounds) for i from 1 to 16, compute Li and Ri as follows:
 	 *  Li = Ri-1;
···
 
 	/* c1...c64 <-- (R16,L16).  (Exchange final blocks L16, R16 and
 	 *  concatenate to form the ciphertext.) */
-	dst[0] = cpu_to_be32(r);
-	dst[1] = cpu_to_be32(l);
+	put_unaligned_be32(r, outbuf);
+	put_unaligned_be32(l, outbuf + 4);
 }
 EXPORT_SYMBOL_GPL(__cast5_encrypt);
 
···
 
 void __cast5_decrypt(struct cast5_ctx *c, u8 *outbuf, const u8 *inbuf)
 {
-	const __be32 *src = (const __be32 *)inbuf;
-	__be32 *dst = (__be32 *)outbuf;
 	u32 l, r, t;
 	u32 I;
 	u32 *Km;
···
 	Km = c->Km;
 	Kr = c->Kr;
 
-	l = be32_to_cpu(src[0]);
-	r = be32_to_cpu(src[1]);
+	l = get_unaligned_be32(inbuf);
+	r = get_unaligned_be32(inbuf + 4);
 
 	if (!(c->rr)) {
 		t = l; l = r; r = t ^ F1(r, Km[15], Kr[15]);
···
 	t = l; l = r; r = t ^ F2(r, Km[1], Kr[1]);
 	t = l; l = r; r = t ^ F1(r, Km[0], Kr[0]);
 
-	dst[0] = cpu_to_be32(r);
-	dst[1] = cpu_to_be32(l);
+	put_unaligned_be32(r, outbuf);
+	put_unaligned_be32(l, outbuf + 4);
 }
 EXPORT_SYMBOL_GPL(__cast5_decrypt);
 
···
 	.cra_flags		= CRYPTO_ALG_TYPE_CIPHER,
 	.cra_blocksize		= CAST5_BLOCK_SIZE,
 	.cra_ctxsize		= sizeof(struct cast5_ctx),
-	.cra_alignmask		= 3,
 	.cra_module		= THIS_MODULE,
 	.cra_u			= {
 		.cipher = {